.claude-plugin/marketplace.json

@@ -181,6 +181,22 @@
       "category": "visualization",
       "tags": ["dash", "plotly", "mantine", "charts", "dashboards", "theming", "dmc"],
       "license": "MIT"
+    },
+    {
+      "name": "contract-validator",
+      "version": "1.0.0",
+      "description": "Cross-plugin compatibility validation and Claude.md agent verification",
+      "source": "./plugins/contract-validator",
+      "author": {
+        "name": "Leo Miranda",
+        "email": "leobmiranda@gmail.com"
+      },
+      "homepage": "https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace/src/branch/main/plugins/contract-validator/README.md",
+      "repository": "https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace.git",
+      "mcpServers": ["./.mcp.json"],
+      "category": "development",
+      "tags": ["validation", "contracts", "compatibility", "agents", "interfaces", "cross-plugin"],
+      "license": "MIT"
     }
   ]
 }

CLAUDE.md

@@ -67,6 +67,7 @@ A plugin marketplace for Claude Code containing:
 | `cmdb-assistant` | NetBox CMDB integration for infrastructure management | 1.0.0 |
 | `data-platform` | pandas, PostgreSQL, and dbt integration for data engineering | 1.0.0 |
 | `viz-platform` | DMC validation, Plotly charts, and theming for dashboards | 1.0.0 |
+| `contract-validator` | Cross-plugin compatibility validation and agent verification | 1.0.0 |
 | `project-hygiene` | Post-task cleanup automation via hooks | 0.1.0 |
 
 ## Quick Start
@@ -93,6 +94,7 @@ A plugin marketplace for Claude Code containing:
 | **Config** | `/config-analyze`, `/config-optimize` |
 | **Data** | `/ingest`, `/profile`, `/schema`, `/explain`, `/lineage`, `/run` |
 | **Visualization** | `/component`, `/chart`, `/dashboard`, `/theme`, `/theme-new`, `/theme-css` |
+| **Validation** | `/validate-contracts`, `/check-agent`, `/list-interfaces` |
 | **Debug** | `/debug-report`, `/debug-review` |
 
 ## Repository Structure

mcp-servers/contract-validator/mcp_server/__init__.py

@@ -0,0 +1,3 @@
+"""Contract Validator MCP Server - Cross-plugin compatibility validation."""
+
+__version__ = "1.0.0"

mcp-servers/contract-validator/mcp_server/parse_tools.py

@@ -0,0 +1,415 @@
+"""
+Parse tools for extracting interfaces from plugin documentation.
+
+Provides structured extraction of:
+- Plugin interfaces from README.md (commands, agents, tools)
+- Agent definitions from CLAUDE.md (tool sequences, workflows)
+"""
+import re
+import os
+from pathlib import Path
+from typing import Optional
+from pydantic import BaseModel
+
+
+class ToolInfo(BaseModel):
+    """Information about a single tool"""
+    name: str
+    category: Optional[str] = None
+    description: Optional[str] = None
+
+
+class CommandInfo(BaseModel):
+    """Information about a plugin command"""
+    name: str
+    description: Optional[str] = None
+
+
+class AgentInfo(BaseModel):
+    """Information about a plugin agent"""
+    name: str
+    description: Optional[str] = None
+    tools: list[str] = []
+
+
+class PluginInterface(BaseModel):
+    """Structured plugin interface extracted from README"""
+    plugin_name: str
+    description: Optional[str] = None
+    commands: list[CommandInfo] = []
+    agents: list[AgentInfo] = []
+    tools: list[ToolInfo] = []
+    tool_categories: dict[str, list[str]] = {}
+    features: list[str] = []
+
+
+class ClaudeMdAgent(BaseModel):
+    """Agent definition extracted from CLAUDE.md"""
+    name: str
+    personality: Optional[str] = None
+    responsibilities: list[str] = []
+    tool_refs: list[str] = []
+    workflow_steps: list[str] = []
+
+
+class ParseTools:
+    """Tools for parsing plugin documentation"""
+
+    async def parse_plugin_interface(self, plugin_path: str) -> dict:
+        """
+        Parse plugin README.md to extract interface declarations.
+
+        Args:
+            plugin_path: Path to plugin directory or README.md file
+
+        Returns:
+            Structured interface with commands, agents, tools, etc.
+        """
+        # Resolve path to README
+        path = Path(plugin_path)
+        if path.is_dir():
+            readme_path = path / "README.md"
+        else:
+            readme_path = path
+
+        if not readme_path.exists():
+            return {
+                "error": f"README.md not found at {readme_path}",
+                "plugin_path": plugin_path
+            }
+
+        content = readme_path.read_text()
+        plugin_name = self._extract_plugin_name(content, path)
+
+        interface = PluginInterface(
+            plugin_name=plugin_name,
+            description=self._extract_description(content),
+            commands=self._extract_commands(content),
+            agents=self._extract_agents_from_readme(content),
+            tools=self._extract_tools(content),
+            tool_categories=self._extract_tool_categories(content),
+            features=self._extract_features(content)
+        )
+
+        return interface.model_dump()
+
+    async def parse_claude_md_agents(self, claude_md_path: str) -> dict:
+        """
+        Parse CLAUDE.md to extract agent definitions and tool sequences.
+
+        Args:
+            claude_md_path: Path to CLAUDE.md file
+
+        Returns:
+            List of agents with their tool sequences
+        """
+        path = Path(claude_md_path)
+
+        if not path.exists():
+            return {
+                "error": f"CLAUDE.md not found at {path}",
+                "claude_md_path": claude_md_path
+            }
+
+        content = path.read_text()
+        agents = self._extract_agents_from_claude_md(content)
+
+        return {
+            "file": str(path),
+            "agents": [a.model_dump() for a in agents],
+            "agent_count": len(agents)
+        }
+
+    def _extract_plugin_name(self, content: str, path: Path) -> str:
+        """Extract plugin name from content or path"""
+        # Try to get from H1 header
+        match = re.search(r'^#\s+(.+?)(?:\s+Plugin|\s*$)', content, re.MULTILINE)
+        if match:
+            name = match.group(1).strip()
+            # Handle cases like "# data-platform Plugin"
+            name = re.sub(r'\s*Plugin\s*$', '', name, flags=re.IGNORECASE)
+            return name
+
+        # Fall back to directory name
+        if path.is_dir():
+            return path.name
+        return path.parent.name
+
+    def _extract_description(self, content: str) -> Optional[str]:
+        """Extract plugin description from first paragraph after title"""
+        # Get content after H1, before first H2
+        match = re.search(r'^#\s+.+?\n\n(.+?)(?=\n##|\n\n##|\Z)', content, re.MULTILINE | re.DOTALL)
+        if match:
+            desc = match.group(1).strip()
+            # Take first paragraph only
+            desc = desc.split('\n\n')[0].strip()
+            return desc
+        return None
+
+    def _extract_commands(self, content: str) -> list[CommandInfo]:
+        """Extract commands from Commands section"""
+        commands = []
+
+        # Find Commands section
+        commands_section = self._extract_section(content, "Commands")
+        if not commands_section:
+            return commands
+
+        # Parse table format: | Command | Description |
+        # Only match actual command names (start with / or alphanumeric)
+        table_pattern = r'\|\s*`?(/[a-z][-a-z0-9]*)`?\s*\|\s*([^|]+)\s*\|'
+        for match in re.finditer(table_pattern, commands_section):
+            cmd_name = match.group(1).strip()
+            desc = match.group(2).strip()
+
+            # Skip header row and separators
+            if cmd_name.lower() in ('command', 'commands') or cmd_name.startswith('-'):
+                continue
+
+            commands.append(CommandInfo(
+                name=cmd_name,
+                description=desc
+            ))
+
+        # Also look for ### `/command-name` format (with backticks)
+        cmd_header_pattern = r'^###\s+`(/[a-z][-a-z0-9]*)`\s*\n(.+?)(?=\n###|\n##|\Z)'
+        for match in re.finditer(cmd_header_pattern, commands_section, re.MULTILINE | re.DOTALL):
+            cmd_name = match.group(1).strip()
+            desc_block = match.group(2).strip()
+            # Get first line or paragraph as description
+            desc = desc_block.split('\n')[0].strip()
+
+            # Don't duplicate if already found in table
+            if not any(c.name == cmd_name for c in commands):
+                commands.append(CommandInfo(name=cmd_name, description=desc))
+
+        # Also look for ### /command-name format (without backticks)
+        cmd_header_pattern2 = r'^###\s+(/[a-z][-a-z0-9]*)\s*\n(.+?)(?=\n###|\n##|\Z)'
+        for match in re.finditer(cmd_header_pattern2, commands_section, re.MULTILINE | re.DOTALL):
+            cmd_name = match.group(1).strip()
+            desc_block = match.group(2).strip()
+            # Get first line or paragraph as description
+            desc = desc_block.split('\n')[0].strip()
+
+            # Don't duplicate if already found in table
+            if not any(c.name == cmd_name for c in commands):
+                commands.append(CommandInfo(name=cmd_name, description=desc))
+
+        return commands
+
+    def _extract_agents_from_readme(self, content: str) -> list[AgentInfo]:
+        """Extract agents from Agents section in README"""
+        agents = []
+
+        # Find Agents section
+        agents_section = self._extract_section(content, "Agents")
+        if not agents_section:
+            return agents
+
+        # Parse table format: | Agent | Description |
+        # Only match actual agent names (alphanumeric with dashes/underscores)
+        table_pattern = r'\|\s*`?([a-z][-a-z0-9_]*)`?\s*\|\s*([^|]+)\s*\|'
+        for match in re.finditer(table_pattern, agents_section):
+            agent_name = match.group(1).strip()
+            desc = match.group(2).strip()
+
+            # Skip header row and separators
+            if agent_name.lower() in ('agent', 'agents') or agent_name.startswith('-'):
+                continue
+
+            agents.append(AgentInfo(name=agent_name, description=desc))
+
+        return agents
+
+    def _extract_tools(self, content: str) -> list[ToolInfo]:
+        """Extract tool list from Tools Summary or similar section"""
+        tools = []
+
+        # Find Tools Summary section
+        tools_section = self._extract_section(content, "Tools Summary")
+        if not tools_section:
+            tools_section = self._extract_section(content, "Tools")
+        if not tools_section:
+            tools_section = self._extract_section(content, "MCP Server Tools")
+
+        if not tools_section:
+            return tools
+
+        # Parse category headers: ### category (N tools)
+        category_pattern = r'###\s*(.+?)\s*(?:\((\d+)\s*tools?\))?\s*\n([^#]+)'
+        for match in re.finditer(category_pattern, tools_section):
+            category = match.group(1).strip()
+            tool_list_text = match.group(3).strip()
+
+            # Extract tool names from backtick lists
+            tool_names = re.findall(r'`([a-z_]+)`', tool_list_text)
+            for name in tool_names:
+                tools.append(ToolInfo(name=name, category=category))
+
+        # Also look for inline tool lists without categories
+        inline_pattern = r'`([a-z_]+)`'
+        all_tool_names = set(t.name for t in tools)
+        for match in re.finditer(inline_pattern, tools_section):
+            name = match.group(1)
+            if name not in all_tool_names:
+                tools.append(ToolInfo(name=name))
+                all_tool_names.add(name)
+
+        return tools
+
+    def _extract_tool_categories(self, content: str) -> dict[str, list[str]]:
+        """Extract tool categories with their tool lists"""
+        categories = {}
+
+        tools_section = self._extract_section(content, "Tools Summary")
+        if not tools_section:
+            tools_section = self._extract_section(content, "Tools")
+        if not tools_section:
+            return categories
+
+        # Parse category headers: ### category (N tools)
+        category_pattern = r'###\s*(.+?)\s*(?:\((\d+)\s*tools?\))?\s*\n([^#]+)'
+        for match in re.finditer(category_pattern, tools_section):
+            category = match.group(1).strip()
+            tool_list_text = match.group(3).strip()
+
+            # Extract tool names from backtick lists
+            tool_names = re.findall(r'`([a-z_]+)`', tool_list_text)
+            if tool_names:
+                categories[category] = tool_names
+
+        return categories
+
+    def _extract_features(self, content: str) -> list[str]:
+        """Extract features from Features section"""
+        features = []
+
+        features_section = self._extract_section(content, "Features")
+        if not features_section:
+            return features
+
+        # Parse bullet points
+        bullet_pattern = r'^[-*]\s+\*\*(.+?)\*\*'
+        for match in re.finditer(bullet_pattern, features_section, re.MULTILINE):
+            features.append(match.group(1).strip())
+
+        return features
+
+    def _extract_section(self, content: str, section_name: str) -> Optional[str]:
+        """Extract content of a markdown section by header name"""
+        # Match ## Section Name - include all content until next ## (same level or higher)
+        pattern = rf'^##\s+{re.escape(section_name)}(?:\s*\([^)]*\))?\s*\n(.*?)(?=\n##[^#]|\Z)'
+        match = re.search(pattern, content, re.MULTILINE | re.DOTALL | re.IGNORECASE)
+        if match:
+            return match.group(1).strip()
+
+        # Try ### level - include content until next ## or ###
+        pattern = rf'^###\s+{re.escape(section_name)}(?:\s*\([^)]*\))?\s*\n(.*?)(?=\n##|\n###[^#]|\Z)'
+        match = re.search(pattern, content, re.MULTILINE | re.DOTALL | re.IGNORECASE)
+        if match:
+            return match.group(1).strip()
+
+        return None
+
+    def _extract_agents_from_claude_md(self, content: str) -> list[ClaudeMdAgent]:
+        """Extract agent definitions from CLAUDE.md"""
+        agents = []
+
+        # Look for Four-Agent Model section specifically
+        # Match section headers like "### Four-Agent Model (projman)" or "## Four-Agent Model"
+        agent_model_match = re.search(
+            r'^##[#]?\s+Four-Agent Model.*?\n(.*?)(?=\n##[^#]|\Z)',
+            content, re.MULTILINE | re.DOTALL
+        )
+        agent_model_section = agent_model_match.group(1) if agent_model_match else None
+
+        if agent_model_section:
+            # Parse agent table within this section
+            # | **Planner** | Thoughtful, methodical | Sprint planning, ... |
+            # Match rows where first cell starts with ** (bold) and contains a capitalized word
+            agent_table_pattern = r'\|\s*\*\*([A-Z][a-zA-Z\s]+?)\*\*\s*\|\s*([^|]+)\s*\|\s*([^|]+)\s*\|'
+
+            for match in re.finditer(agent_table_pattern, agent_model_section):
+                agent_name = match.group(1).strip()
+                personality = match.group(2).strip()
+                responsibilities = match.group(3).strip()
+
+                # Skip header rows and separator rows
+                if agent_name.lower() in ('agent', 'agents', '---', '-', ''):
+                    continue
+                if 'personality' in personality.lower() or '---' in personality:
+                    continue
+
+                # Skip if personality looks like tool names (contains backticks)
+                if '`' in personality:
+                    continue
+
+                # Extract tool references from responsibilities
+                tool_refs = re.findall(r'`([a-z_]+)`', responsibilities)
+
+                # Split responsibilities by comma
+                resp_list = [r.strip() for r in responsibilities.split(',')]
+
+                agents.append(ClaudeMdAgent(
+                    name=agent_name,
+                    personality=personality,
+                    responsibilities=resp_list,
+                    tool_refs=tool_refs
+                ))
+
+        # Also look for agents table in ## Agents section
+        agents_section = self._extract_section(content, "Agents")
+        if agents_section:
+            # Parse table: | Agent | Description |
+            table_pattern = r'\|\s*`?([a-z][-a-z0-9_]+)`?\s*\|\s*([^|]+)\s*\|'
+            for match in re.finditer(table_pattern, agents_section):
+                agent_name = match.group(1).strip()
+                desc = match.group(2).strip()
+
+                # Skip header rows
+                if agent_name.lower() in ('agent', 'agents', '---', '-'):
+                    continue
+
+                # Check if agent already exists
+                if not any(a.name.lower() == agent_name.lower() for a in agents):
+                    agents.append(ClaudeMdAgent(
+                        name=agent_name,
+                        responsibilities=[desc] if desc else []
+                    ))
+
+        # Look for workflow sections to enrich agent data
+        workflow_section = self._extract_section(content, "Workflow")
+        if workflow_section:
+            # Parse numbered steps
+            step_pattern = r'^\d+\.\s+(.+?)$'
+            workflow_steps = re.findall(step_pattern, workflow_section, re.MULTILINE)
+
+            # Associate workflow steps with agents mentioned
+            for agent in agents:
+                for step in workflow_steps:
+                    if agent.name.lower() in step.lower():
+                        agent.workflow_steps.append(step)
+                        # Extract any tool references in the step
+                        step_tools = re.findall(r'`([a-z_]+)`', step)
+                        agent.tool_refs.extend(t for t in step_tools if t not in agent.tool_refs)
+
+        # Look for agent-specific sections (### Planner Agent)
+        agent_section_pattern = r'^###?\s+([A-Z][a-z]+(?:\s+[A-Z][a-z]+)?)\s+Agent\s*\n(.*?)(?=\n##|\n###|\Z)'
+        for match in re.finditer(agent_section_pattern, content, re.MULTILINE | re.DOTALL):
+            agent_name = match.group(1).strip()
+            section_content = match.group(2).strip()
+
+            # Check if agent already exists
+            existing = next((a for a in agents if a.name.lower() == agent_name.lower()), None)
+            if existing:
+                # Add tool refs from this section
+                tool_refs = re.findall(r'`([a-z_]+)`', section_content)
+                existing.tool_refs.extend(t for t in tool_refs if t not in existing.tool_refs)
+            else:
+                tool_refs = re.findall(r'`([a-z_]+)`', section_content)
+                agents.append(ClaudeMdAgent(
+                    name=agent_name,
+                    tool_refs=tool_refs
+                ))
+
+        return agents

mcp-servers/contract-validator/mcp_server/report_tools.py

@@ -0,0 +1,337 @@
+"""
+Report tools for generating compatibility reports and listing issues.
+
+Provides:
+- generate_compatibility_report: Full marketplace validation report
+- list_issues: Filtered issue listing
+"""
+import os
+from pathlib import Path
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel
+
+from .parse_tools import ParseTools
+from .validation_tools import ValidationTools, IssueSeverity, IssueType, ValidationIssue
+
+
+class ReportSummary(BaseModel):
+    """Summary statistics for a report"""
+    total_plugins: int = 0
+    total_commands: int = 0
+    total_agents: int = 0
+    total_tools: int = 0
+    total_issues: int = 0
+    errors: int = 0
+    warnings: int = 0
+    info: int = 0
+
+
+class ReportTools:
+    """Tools for generating reports and listing issues"""
+
+    def __init__(self):
+        self.parse_tools = ParseTools()
+        self.validation_tools = ValidationTools()
+
+    async def generate_compatibility_report(
+        self,
+        marketplace_path: str,
+        format: str = "markdown"
+    ) -> dict:
+        """
+        Generate a comprehensive compatibility report for all plugins.
+
+        Args:
+            marketplace_path: Path to marketplace root directory
+            format: Output format ("markdown" or "json")
+
+        Returns:
+            Full compatibility report with all findings
+        """
+        marketplace = Path(marketplace_path)
+        plugins_dir = marketplace / "plugins"
+
+        if not plugins_dir.exists():
+            return {
+                "error": f"Plugins directory not found at {plugins_dir}",
+                "marketplace_path": marketplace_path
+            }
+
+        # Discover all plugins
+        plugins = []
+        for item in plugins_dir.iterdir():
+            if item.is_dir() and (item / ".claude-plugin").exists():
+                plugins.append(item)
+
+        if not plugins:
+            return {
+                "error": "No plugins found in marketplace",
+                "marketplace_path": marketplace_path
+            }
+
+        # Parse all plugin interfaces
+        interfaces = {}
+        all_issues = []
+        summary = ReportSummary(total_plugins=len(plugins))
+
+        for plugin_path in plugins:
+            interface = await self.parse_tools.parse_plugin_interface(str(plugin_path))
+            if "error" not in interface:
+                interfaces[interface["plugin_name"]] = interface
+                summary.total_commands += len(interface.get("commands", []))
+                summary.total_agents += len(interface.get("agents", []))
+                summary.total_tools += len(interface.get("tools", []))
+
+        # Run pairwise compatibility checks
+        plugin_names = list(interfaces.keys())
+        compatibility_results = []
+
+        for i, name_a in enumerate(plugin_names):
+            for name_b in plugin_names[i+1:]:
+                path_a = plugins_dir / self._find_plugin_dir(plugins_dir, name_a)
+                path_b = plugins_dir / self._find_plugin_dir(plugins_dir, name_b)
+
+                result = await self.validation_tools.validate_compatibility(
+                    str(path_a), str(path_b)
+                )
+
+                if "error" not in result:
+                    compatibility_results.append(result)
+                    all_issues.extend(result.get("issues", []))
+
+        # Parse CLAUDE.md if exists
+        claude_md = marketplace / "CLAUDE.md"
+        agents_from_claude = []
+        if claude_md.exists():
+            agents_result = await self.parse_tools.parse_claude_md_agents(str(claude_md))
+            if "error" not in agents_result:
+                agents_from_claude = agents_result.get("agents", [])
+
+                # Validate each agent
+                for agent in agents_from_claude:
+                    agent_result = await self.validation_tools.validate_agent_refs(
+                        agent["name"],
+                        str(claude_md),
+                        [str(p) for p in plugins]
+                    )
+                    if "error" not in agent_result:
+                        all_issues.extend(agent_result.get("issues", []))
+
+        # Count issues by severity
+        for issue in all_issues:
+            severity = issue.get("severity", "info")
+            if isinstance(severity, str):
+                severity_str = severity.lower()
+            else:
+                severity_str = severity.value if hasattr(severity, 'value') else str(severity).lower()
+
+            if "error" in severity_str:
+                summary.errors += 1
+            elif "warning" in severity_str:
+                summary.warnings += 1
+            else:
+                summary.info += 1
+
+        summary.total_issues = len(all_issues)
+
+        # Generate report
+        if format == "json":
+            return {
+                "generated_at": datetime.now().isoformat(),
+                "marketplace_path": marketplace_path,
+                "summary": summary.model_dump(),
+                "plugins": interfaces,
+                "compatibility_checks": compatibility_results,
+                "claude_md_agents": agents_from_claude,
+                "all_issues": all_issues
+            }
+        else:
+            # Generate markdown report
+            report = self._generate_markdown_report(
+                marketplace_path,
+                summary,
+                interfaces,
+                compatibility_results,
+                agents_from_claude,
+                all_issues
+            )
+            return {
+                "generated_at": datetime.now().isoformat(),
+                "marketplace_path": marketplace_path,
+                "summary": summary.model_dump(),
+                "report": report
+            }
+
+    def _find_plugin_dir(self, plugins_dir: Path, plugin_name: str) -> str:
+        """Find plugin directory by name (handles naming variations)"""
+        # Try exact match first
+        for item in plugins_dir.iterdir():
+            if item.is_dir():
+                if item.name.lower() == plugin_name.lower():
+                    return item.name
+                # Check plugin.json for name
+                plugin_json = item / ".claude-plugin" / "plugin.json"
+                if plugin_json.exists():
+                    import json
+                    try:
+                        data = json.loads(plugin_json.read_text())
+                        if data.get("name", "").lower() == plugin_name.lower():
+                            return item.name
+                    except:
+                        pass
+        return plugin_name
+
+    def _generate_markdown_report(
+        self,
+        marketplace_path: str,
+        summary: ReportSummary,
+        interfaces: dict,
+        compatibility_results: list,
+        agents: list,
+        issues: list
+    ) -> str:
+        """Generate markdown formatted report"""
+        lines = [
+            "# Contract Validation Report",
+            "",
+            f"**Generated:** {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}",
+            f"**Marketplace:** `{marketplace_path}`",
+            "",
+            "## Summary",
+            "",
+            f"| Metric | Count |",
+            f"|--------|-------|",
+            f"| Plugins | {summary.total_plugins} |",
+            f"| Commands | {summary.total_commands} |",
+            f"| Agents | {summary.total_agents} |",
+            f"| Tools | {summary.total_tools} |",
+            f"| **Issues** | **{summary.total_issues}** |",
+            f"| - Errors | {summary.errors} |",
+            f"| - Warnings | {summary.warnings} |",
+            f"| - Info | {summary.info} |",
+            "",
+        ]
+
+        # Plugin details
+        lines.extend([
+            "## Plugins",
+            "",
+        ])
+
+        for name, interface in interfaces.items():
+            cmds = len(interface.get("commands", []))
+            agents_count = len(interface.get("agents", []))
+            tools = len(interface.get("tools", []))
+            lines.append(f"### {name}")
+            lines.append("")
+            lines.append(f"- Commands: {cmds}")
+            lines.append(f"- Agents: {agents_count}")
+            lines.append(f"- Tools: {tools}")
+            lines.append("")
+
+        # Compatibility results
+        if compatibility_results:
+            lines.extend([
+                "## Compatibility Checks",
+                "",
+            ])
+
+            for result in compatibility_results:
+                status = "✓" if result.get("compatible", True) else "✗"
+                lines.append(f"### {result['plugin_a']} ↔ {result['plugin_b']} {status}")
+                lines.append("")
+
+                if result.get("shared_tools"):
+                    lines.append(f"- Shared tools: `{', '.join(result['shared_tools'])}`")
+                if result.get("issues"):
+                    for issue in result["issues"]:
+                        sev = issue.get("severity", "info")
+                        if hasattr(sev, 'value'):
+                            sev = sev.value
+                        lines.append(f"- [{sev.upper()}] {issue['message']}")
+                lines.append("")
+
+        # Issues section
+        if issues:
+            lines.extend([
+                "## All Issues",
+                "",
+                "| Severity | Type | Message |",
+                "|----------|------|---------|",
+            ])
+
+            for issue in issues:
+                sev = issue.get("severity", "info")
+                itype = issue.get("issue_type", "unknown")
+                msg = issue.get("message", "")
+
+                if hasattr(sev, 'value'):
+                    sev = sev.value
+                if hasattr(itype, 'value'):
+                    itype = itype.value
+
+                # Truncate message for table
+                msg_short = msg[:60] + "..." if len(msg) > 60 else msg
+                lines.append(f"| {sev} | {itype} | {msg_short} |")
+
+            lines.append("")
+
+        return "\n".join(lines)
+
+    async def list_issues(
+        self,
+        marketplace_path: str,
+        severity: str = "all",
+        issue_type: str = "all"
+    ) -> dict:
+        """
+        List validation issues with optional filtering.
+
+        Args:
+            marketplace_path: Path to marketplace root directory
+            severity: Filter by severity ("error", "warning", "info", "all")
+            issue_type: Filter by type ("missing_tool", "interface_mismatch", etc., "all")
+
+        Returns:
+            Filtered list of issues
+        """
+        # Generate full report first
+        report = await self.generate_compatibility_report(marketplace_path, format="json")
+
+        if "error" in report:
+            return report
+
+        all_issues = report.get("all_issues", [])
+
+        # Filter by severity
+        if severity != "all":
+            filtered = []
+            for issue in all_issues:
+                issue_sev = issue.get("severity", "info")
+                if hasattr(issue_sev, 'value'):
+                    issue_sev = issue_sev.value
+                if isinstance(issue_sev, str) and severity.lower() in issue_sev.lower():
+                    filtered.append(issue)
+            all_issues = filtered
+
+        # Filter by type
+        if issue_type != "all":
+            filtered = []
+            for issue in all_issues:
+                itype = issue.get("issue_type", "unknown")
+                if hasattr(itype, 'value'):
+                    itype = itype.value
+                if isinstance(itype, str) and issue_type.lower() in itype.lower():
+                    filtered.append(issue)
+            all_issues = filtered
+
+        return {
+            "marketplace_path": marketplace_path,
+            "filters": {
+                "severity": severity,
+                "issue_type": issue_type
+            },
+            "total_issues": len(all_issues),
+            "issues": all_issues
+        }

mcp-servers/contract-validator/mcp_server/server.py

@@ -0,0 +1,274 @@
+"""
+MCP Server entry point for Contract Validator.
+
+Provides cross-plugin compatibility validation and Claude.md agent verification
+tools to Claude Code via JSON-RPC 2.0 over stdio.
+"""
+import asyncio
+import logging
+import json
+from mcp.server import Server
+from mcp.server.stdio import stdio_server
+from mcp.types import Tool, TextContent
+
+from .parse_tools import ParseTools
+from .validation_tools import ValidationTools
+from .report_tools import ReportTools
+
+# Suppress noisy MCP validation warnings on stderr
+logging.basicConfig(level=logging.INFO)
+logging.getLogger("root").setLevel(logging.ERROR)
+logging.getLogger("mcp").setLevel(logging.ERROR)
+logger = logging.getLogger(__name__)
+
+
+class ContractValidatorMCPServer:
+    """MCP Server for cross-plugin compatibility validation"""
+
+    def __init__(self):
+        self.server = Server("contract-validator-mcp")
+        self.parse_tools = ParseTools()
+        self.validation_tools = ValidationTools()
+        self.report_tools = ReportTools()
+
+    async def initialize(self):
+        """Initialize server."""
+        logger.info("Contract Validator MCP Server initialized")
+
+    def setup_tools(self):
+        """Register all available tools with the MCP server"""
+
+        @self.server.list_tools()
+        async def list_tools() -> list[Tool]:
+            """Return list of available tools"""
+            tools = [
+                # Parse tools (to be implemented in #186)
+                Tool(
+                    name="parse_plugin_interface",
+                    description="Parse plugin README.md to extract interface declarations (inputs, outputs, tools)",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "plugin_path": {
+                                "type": "string",
+                                "description": "Path to plugin directory or README.md"
+                            }
+                        },
+                        "required": ["plugin_path"]
+                    }
+                ),
+                Tool(
+                    name="parse_claude_md_agents",
+                    description="Parse Claude.md to extract agent definitions and their tool sequences",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "claude_md_path": {
+                                "type": "string",
+                                "description": "Path to CLAUDE.md file"
+                            }
+                        },
+                        "required": ["claude_md_path"]
+                    }
+                ),
+                # Validation tools (to be implemented in #187)
+                Tool(
+                    name="validate_compatibility",
+                    description="Validate compatibility between two plugin interfaces",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "plugin_a": {
+                                "type": "string",
+                                "description": "Path to first plugin"
+                            },
+                            "plugin_b": {
+                                "type": "string",
+                                "description": "Path to second plugin"
+                            }
+                        },
+                        "required": ["plugin_a", "plugin_b"]
+                    }
+                ),
+                Tool(
+                    name="validate_agent_refs",
+                    description="Validate that all tool references in an agent definition exist",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "agent_name": {
+                                "type": "string",
+                                "description": "Name of agent to validate"
+                            },
+                            "claude_md_path": {
+                                "type": "string",
+                                "description": "Path to CLAUDE.md containing agent"
+                            },
+                            "plugin_paths": {
+                                "type": "array",
+                                "items": {"type": "string"},
+                                "description": "Paths to available plugins"
+                            }
+                        },
+                        "required": ["agent_name", "claude_md_path"]
+                    }
+                ),
+                Tool(
+                    name="validate_data_flow",
+                    description="Validate data flow through an agent's tool sequence",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "agent_name": {
+                                "type": "string",
+                                "description": "Name of agent to validate"
+                            },
+                            "claude_md_path": {
+                                "type": "string",
+                                "description": "Path to CLAUDE.md containing agent"
+                            }
+                        },
+                        "required": ["agent_name", "claude_md_path"]
+                    }
+                ),
+                # Report tools (to be implemented in #188)
+                Tool(
+                    name="generate_compatibility_report",
+                    description="Generate a comprehensive compatibility report for all plugins",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "marketplace_path": {
+                                "type": "string",
+                                "description": "Path to marketplace root directory"
+                            },
+                            "format": {
+                                "type": "string",
+                                "enum": ["markdown", "json"],
+                                "default": "markdown",
+                                "description": "Output format"
+                            }
+                        },
+                        "required": ["marketplace_path"]
+                    }
+                ),
+                Tool(
+                    name="list_issues",
+                    description="List validation issues with optional filtering",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "marketplace_path": {
+                                "type": "string",
+                                "description": "Path to marketplace root directory"
+                            },
+                            "severity": {
+                                "type": "string",
+                                "enum": ["error", "warning", "info", "all"],
+                                "default": "all",
+                                "description": "Filter by severity"
+                            },
+                            "issue_type": {
+                                "type": "string",
+                                "enum": ["missing_tool", "interface_mismatch", "optional_dependency", "undeclared_output", "all"],
+                                "default": "all",
+                                "description": "Filter by issue type"
+                            }
+                        },
+                        "required": ["marketplace_path"]
+                    }
+                )
+            ]
+            return tools
+
+        @self.server.call_tool()
+        async def call_tool(name: str, arguments: dict) -> list[TextContent]:
+            """Handle tool invocation."""
+            try:
+                # All tools return placeholder responses for now
+                # Actual implementation will be added in issues #186, #187, #188
+
+                if name == "parse_plugin_interface":
+                    result = await self._parse_plugin_interface(**arguments)
+                elif name == "parse_claude_md_agents":
+                    result = await self._parse_claude_md_agents(**arguments)
+                elif name == "validate_compatibility":
+                    result = await self._validate_compatibility(**arguments)
+                elif name == "validate_agent_refs":
+                    result = await self._validate_agent_refs(**arguments)
+                elif name == "validate_data_flow":
+                    result = await self._validate_data_flow(**arguments)
+                elif name == "generate_compatibility_report":
+                    result = await self._generate_compatibility_report(**arguments)
+                elif name == "list_issues":
+                    result = await self._list_issues(**arguments)
+                else:
+                    raise ValueError(f"Unknown tool: {name}")
+
+                return [TextContent(
+                    type="text",
+                    text=json.dumps(result, indent=2, default=str)
+                )]
+
+            except Exception as e:
+                logger.error(f"Tool {name} failed: {e}")
+                return [TextContent(
+                    type="text",
+                    text=json.dumps({"error": str(e)}, indent=2)
+                )]
+
+    # Parse tool implementations (Issue #186)
+
+    async def _parse_plugin_interface(self, plugin_path: str) -> dict:
+        """Parse plugin interface from README.md"""
+        return await self.parse_tools.parse_plugin_interface(plugin_path)
+
+    async def _parse_claude_md_agents(self, claude_md_path: str) -> dict:
+        """Parse agents from CLAUDE.md"""
+        return await self.parse_tools.parse_claude_md_agents(claude_md_path)
+
+    # Validation tool implementations (Issue #187)
+
+    async def _validate_compatibility(self, plugin_a: str, plugin_b: str) -> dict:
+        """Validate compatibility between plugins"""
+        return await self.validation_tools.validate_compatibility(plugin_a, plugin_b)
+
+    async def _validate_agent_refs(self, agent_name: str, claude_md_path: str, plugin_paths: list = None) -> dict:
+        """Validate agent tool references"""
+        return await self.validation_tools.validate_agent_refs(agent_name, claude_md_path, plugin_paths)
+
+    async def _validate_data_flow(self, agent_name: str, claude_md_path: str) -> dict:
+        """Validate agent data flow"""
+        return await self.validation_tools.validate_data_flow(agent_name, claude_md_path)
+
+    # Report tool implementations (Issue #188)
+
+    async def _generate_compatibility_report(self, marketplace_path: str, format: str = "markdown") -> dict:
+        """Generate comprehensive compatibility report"""
+        return await self.report_tools.generate_compatibility_report(marketplace_path, format)
+
+    async def _list_issues(self, marketplace_path: str, severity: str = "all", issue_type: str = "all") -> dict:
+        """List validation issues with filtering"""
+        return await self.report_tools.list_issues(marketplace_path, severity, issue_type)
+
+    async def run(self):
+        """Run the MCP server"""
+        await self.initialize()
+        self.setup_tools()
+
+        async with stdio_server() as (read_stream, write_stream):
+            await self.server.run(
+                read_stream,
+                write_stream,
+                self.server.create_initialization_options()
+            )
+
+
+async def main():
+    """Main entry point"""
+    server = ContractValidatorMCPServer()
+    await server.run()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

mcp-servers/contract-validator/mcp_server/validation_tools.py

@@ -0,0 +1,338 @@
+"""
+Validation tools for checking cross-plugin compatibility and agent references.
+
+Provides:
+- validate_compatibility: Compare two plugin interfaces
+- validate_agent_refs: Check agent tool references exist
+- validate_data_flow: Verify data flow through agent sequences
+"""
+from pathlib import Path
+from typing import Optional
+from pydantic import BaseModel
+from enum import Enum
+
+from .parse_tools import ParseTools, PluginInterface, ClaudeMdAgent
+
+
+class IssueSeverity(str, Enum):
+    ERROR = "error"
+    WARNING = "warning"
+    INFO = "info"
+
+
+class IssueType(str, Enum):
+    MISSING_TOOL = "missing_tool"
+    INTERFACE_MISMATCH = "interface_mismatch"
+    OPTIONAL_DEPENDENCY = "optional_dependency"
+    UNDECLARED_OUTPUT = "undeclared_output"
+    INVALID_SEQUENCE = "invalid_sequence"
+
+
+class ValidationIssue(BaseModel):
+    """A single validation issue"""
+    severity: IssueSeverity
+    issue_type: IssueType
+    message: str
+    location: Optional[str] = None
+    suggestion: Optional[str] = None
+
+
+class CompatibilityResult(BaseModel):
+    """Result of compatibility check between two plugins"""
+    plugin_a: str
+    plugin_b: str
+    compatible: bool
+    shared_tools: list[str] = []
+    a_only_tools: list[str] = []
+    b_only_tools: list[str] = []
+    issues: list[ValidationIssue] = []
+
+
+class AgentValidationResult(BaseModel):
+    """Result of agent reference validation"""
+    agent_name: str
+    valid: bool
+    tool_refs_found: list[str] = []
+    tool_refs_missing: list[str] = []
+    issues: list[ValidationIssue] = []
+
+
+class DataFlowResult(BaseModel):
+    """Result of data flow validation"""
+    agent_name: str
+    valid: bool
+    flow_steps: list[str] = []
+    issues: list[ValidationIssue] = []
+
+
+class ValidationTools:
+    """Tools for validating plugin compatibility and agent references"""
+
+    def __init__(self):
+        self.parse_tools = ParseTools()
+
+    async def validate_compatibility(self, plugin_a: str, plugin_b: str) -> dict:
+        """
+        Validate compatibility between two plugin interfaces.
+
+        Compares tools, commands, and agents to identify overlaps and gaps.
+
+        Args:
+            plugin_a: Path to first plugin directory
+            plugin_b: Path to second plugin directory
+
+        Returns:
+            Compatibility report with shared tools, unique tools, and issues
+        """
+        # Parse both plugins
+        interface_a = await self.parse_tools.parse_plugin_interface(plugin_a)
+        interface_b = await self.parse_tools.parse_plugin_interface(plugin_b)
+
+        # Check for parse errors
+        if "error" in interface_a:
+            return {
+                "error": f"Failed to parse plugin A: {interface_a['error']}",
+                "plugin_a": plugin_a,
+                "plugin_b": plugin_b
+            }
+        if "error" in interface_b:
+            return {
+                "error": f"Failed to parse plugin B: {interface_b['error']}",
+                "plugin_a": plugin_a,
+                "plugin_b": plugin_b
+            }
+
+        # Extract tool names
+        tools_a = set(t["name"] for t in interface_a.get("tools", []))
+        tools_b = set(t["name"] for t in interface_b.get("tools", []))
+
+        # Find overlaps and differences
+        shared = tools_a & tools_b
+        a_only = tools_a - tools_b
+        b_only = tools_b - tools_a
+
+        issues = []
+
+        # Check for potential naming conflicts
+        if shared:
+            issues.append(ValidationIssue(
+                severity=IssueSeverity.WARNING,
+                issue_type=IssueType.INTERFACE_MISMATCH,
+                message=f"Both plugins define tools with same names: {list(shared)}",
+                location=f"{interface_a['plugin_name']} and {interface_b['plugin_name']}",
+                suggestion="Ensure tools with same names have compatible interfaces"
+            ))
+
+        # Check command overlaps
+        cmds_a = set(c["name"] for c in interface_a.get("commands", []))
+        cmds_b = set(c["name"] for c in interface_b.get("commands", []))
+        shared_cmds = cmds_a & cmds_b
+
+        if shared_cmds:
+            issues.append(ValidationIssue(
+                severity=IssueSeverity.ERROR,
+                issue_type=IssueType.INTERFACE_MISMATCH,
+                message=f"Command name conflict: {list(shared_cmds)}",
+                location=f"{interface_a['plugin_name']} and {interface_b['plugin_name']}",
+                suggestion="Rename conflicting commands to avoid ambiguity"
+            ))
+
+        result = CompatibilityResult(
+            plugin_a=interface_a["plugin_name"],
+            plugin_b=interface_b["plugin_name"],
+            compatible=len([i for i in issues if i.severity == IssueSeverity.ERROR]) == 0,
+            shared_tools=list(shared),
+            a_only_tools=list(a_only),
+            b_only_tools=list(b_only),
+            issues=issues
+        )
+
+        return result.model_dump()
+
+    async def validate_agent_refs(
+        self,
+        agent_name: str,
+        claude_md_path: str,
+        plugin_paths: list[str] = None
+    ) -> dict:
+        """
+        Validate that all tool references in an agent definition exist.
+
+        Args:
+            agent_name: Name of the agent to validate
+            claude_md_path: Path to CLAUDE.md containing the agent
+            plugin_paths: Optional list of plugin paths to check for tools
+
+        Returns:
+            Validation result with found/missing tools and issues
+        """
+        # Parse CLAUDE.md for agents
+        agents_result = await self.parse_tools.parse_claude_md_agents(claude_md_path)
+
+        if "error" in agents_result:
+            return {
+                "error": agents_result["error"],
+                "agent_name": agent_name
+            }
+
+        # Find the specific agent
+        agent = None
+        for a in agents_result.get("agents", []):
+            if a["name"].lower() == agent_name.lower():
+                agent = a
+                break
+
+        if not agent:
+            return {
+                "error": f"Agent '{agent_name}' not found in {claude_md_path}",
+                "agent_name": agent_name,
+                "available_agents": [a["name"] for a in agents_result.get("agents", [])]
+            }
+
+        # Collect all available tools from plugins
+        available_tools = set()
+        if plugin_paths:
+            for plugin_path in plugin_paths:
+                interface = await self.parse_tools.parse_plugin_interface(plugin_path)
+                if "error" not in interface:
+                    for tool in interface.get("tools", []):
+                        available_tools.add(tool["name"])
+
+        # Check agent tool references
+        tool_refs = set(agent.get("tool_refs", []))
+        found = tool_refs & available_tools if available_tools else tool_refs
+        missing = tool_refs - available_tools if available_tools else set()
+
+        issues = []
+
+        # Report missing tools
+        for tool in missing:
+            issues.append(ValidationIssue(
+                severity=IssueSeverity.ERROR,
+                issue_type=IssueType.MISSING_TOOL,
+                message=f"Agent '{agent_name}' references tool '{tool}' which is not found",
+                location=claude_md_path,
+                suggestion=f"Check if tool '{tool}' exists or fix the reference"
+            ))
+
+        # Check if agent has no tool refs (might be incomplete)
+        if not tool_refs:
+            issues.append(ValidationIssue(
+                severity=IssueSeverity.INFO,
+                issue_type=IssueType.UNDECLARED_OUTPUT,
+                message=f"Agent '{agent_name}' has no documented tool references",
+                location=claude_md_path,
+                suggestion="Consider documenting which tools this agent uses"
+            ))
+
+        result = AgentValidationResult(
+            agent_name=agent_name,
+            valid=len([i for i in issues if i.severity == IssueSeverity.ERROR]) == 0,
+            tool_refs_found=list(found),
+            tool_refs_missing=list(missing),
+            issues=issues
+        )
+
+        return result.model_dump()
+
+    async def validate_data_flow(self, agent_name: str, claude_md_path: str) -> dict:
+        """
+        Validate data flow through an agent's tool sequence.
+
+        Checks that each step's expected output can be used by the next step.
+
+        Args:
+            agent_name: Name of the agent to validate
+            claude_md_path: Path to CLAUDE.md containing the agent
+
+        Returns:
+            Data flow validation result with steps and issues
+        """
+        # Parse CLAUDE.md for agents
+        agents_result = await self.parse_tools.parse_claude_md_agents(claude_md_path)
+
+        if "error" in agents_result:
+            return {
+                "error": agents_result["error"],
+                "agent_name": agent_name
+            }
+
+        # Find the specific agent
+        agent = None
+        for a in agents_result.get("agents", []):
+            if a["name"].lower() == agent_name.lower():
+                agent = a
+                break
+
+        if not agent:
+            return {
+                "error": f"Agent '{agent_name}' not found in {claude_md_path}",
+                "agent_name": agent_name,
+                "available_agents": [a["name"] for a in agents_result.get("agents", [])]
+            }
+
+        issues = []
+        flow_steps = []
+
+        # Extract workflow steps
+        workflow_steps = agent.get("workflow_steps", [])
+        responsibilities = agent.get("responsibilities", [])
+
+        # Build flow from workflow steps or responsibilities
+        steps = workflow_steps if workflow_steps else responsibilities
+
+        for i, step in enumerate(steps):
+            flow_steps.append(f"Step {i+1}: {step}")
+
+        # Check for data flow patterns
+        tool_refs = agent.get("tool_refs", [])
+
+        # Known data flow patterns
+        # e.g., data-platform produces data_ref, viz-platform consumes it
+        known_producers = {
+            "read_csv": "data_ref",
+            "read_parquet": "data_ref",
+            "pg_query": "data_ref",
+            "filter": "data_ref",
+            "groupby": "data_ref",
+        }
+
+        known_consumers = {
+            "describe": "data_ref",
+            "head": "data_ref",
+            "tail": "data_ref",
+            "to_csv": "data_ref",
+            "to_parquet": "data_ref",
+        }
+
+        # Check if agent uses tools that require data_ref
+        has_producer = any(t in known_producers for t in tool_refs)
+        has_consumer = any(t in known_consumers for t in tool_refs)
+
+        if has_consumer and not has_producer:
+            issues.append(ValidationIssue(
+                severity=IssueSeverity.WARNING,
+                issue_type=IssueType.INTERFACE_MISMATCH,
+                message=f"Agent '{agent_name}' uses tools that consume data_ref but no producer found",
+                location=claude_md_path,
+                suggestion="Ensure a data loading tool (read_csv, pg_query, etc.) is used before data consumers"
+            ))
+
+        # Check for empty workflow
+        if not steps and not tool_refs:
+            issues.append(ValidationIssue(
+                severity=IssueSeverity.INFO,
+                issue_type=IssueType.UNDECLARED_OUTPUT,
+                message=f"Agent '{agent_name}' has no documented workflow or tool sequence",
+                location=claude_md_path,
+                suggestion="Consider documenting the agent's workflow steps"
+            ))
+
+        result = DataFlowResult(
+            agent_name=agent_name,
+            valid=len([i for i in issues if i.severity == IssueSeverity.ERROR]) == 0,
+            flow_steps=flow_steps,
+            issues=issues
+        )
+
+        return result.model_dump()

mcp-servers/contract-validator/pyproject.toml

@@ -0,0 +1,41 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "contract-validator-mcp"
+version = "1.0.0"
+description = "MCP Server for cross-plugin compatibility validation and agent verification"
+readme = "README.md"
+license = {text = "MIT"}
+requires-python = ">=3.10"
+authors = [
+    {name = "Leo Miranda"}
+]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+dependencies = [
+    "mcp>=0.9.0",
+    "pydantic>=2.5.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=7.4.3",
+    "pytest-asyncio>=0.23.0",
+]
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["mcp_server*"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]

mcp-servers/contract-validator/requirements.txt

@@ -0,0 +1,9 @@
+# MCP SDK
+mcp>=0.9.0
+
+# Utilities
+pydantic>=2.5.0
+
+# Testing
+pytest>=7.4.3
+pytest-asyncio>=0.23.0

mcp-servers/contract-validator/tests/__init__.py

@@ -0,0 +1 @@
+# Tests for contract-validator MCP server

mcp-servers/contract-validator/tests/test_parse_tools.py

@@ -0,0 +1,193 @@
+"""
+Unit tests for parse tools.
+"""
+import pytest
+from pathlib import Path
+
+
+@pytest.fixture
+def parse_tools():
+    """Create ParseTools instance"""
+    from mcp_server.parse_tools import ParseTools
+    return ParseTools()
+
+
+@pytest.fixture
+def sample_readme(tmp_path):
+    """Create a sample README.md for testing"""
+    readme = tmp_path / "README.md"
+    readme.write_text("""# Test Plugin
+
+A test plugin for validation.
+
+## Features
+
+- **Feature One**: Does something
+- **Feature Two**: Does something else
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/test-cmd` | Test command |
+| `/another-cmd` | Another test command |
+
+## Agents
+
+| Agent | Description |
+|-------|-------------|
+| `test-agent` | A test agent |
+
+## Tools Summary
+
+### Category A (3 tools)
+`tool_a`, `tool_b`, `tool_c`
+
+### Category B (2 tools)
+`tool_d`, `tool_e`
+""")
+    return str(tmp_path)
+
+
+@pytest.fixture
+def sample_claude_md(tmp_path):
+    """Create a sample CLAUDE.md for testing"""
+    claude_md = tmp_path / "CLAUDE.md"
+    claude_md.write_text("""# CLAUDE.md
+
+## Project Overview
+
+### Four-Agent Model (test)
+
+| Agent | Personality | Responsibilities |
+|-------|-------------|------------------|
+| **Planner** | Thoughtful | Planning via `create_issue`, `search_lessons` |
+| **Executor** | Focused | Implementation via `write`, `edit` |
+
+## Workflow
+
+1. Planner creates issues
+2. Executor implements code
+""")
+    return str(claude_md)
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_interface_basic(parse_tools, sample_readme):
+    """Test basic plugin interface parsing"""
+    result = await parse_tools.parse_plugin_interface(sample_readme)
+
+    assert "error" not in result
+    # Plugin name extraction strips "Plugin" suffix
+    assert result["plugin_name"] == "Test"
+    assert "A test plugin" in result["description"]
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_interface_commands(parse_tools, sample_readme):
+    """Test command extraction from README"""
+    result = await parse_tools.parse_plugin_interface(sample_readme)
+
+    commands = result["commands"]
+    assert len(commands) == 2
+    assert commands[0]["name"] == "/test-cmd"
+    assert commands[1]["name"] == "/another-cmd"
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_interface_agents(parse_tools, sample_readme):
+    """Test agent extraction from README"""
+    result = await parse_tools.parse_plugin_interface(sample_readme)
+
+    agents = result["agents"]
+    assert len(agents) == 1
+    assert agents[0]["name"] == "test-agent"
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_interface_tools(parse_tools, sample_readme):
+    """Test tool extraction from README"""
+    result = await parse_tools.parse_plugin_interface(sample_readme)
+
+    tools = result["tools"]
+    tool_names = [t["name"] for t in tools]
+    assert "tool_a" in tool_names
+    assert "tool_b" in tool_names
+    assert "tool_e" in tool_names
+    assert len(tools) >= 5
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_interface_categories(parse_tools, sample_readme):
+    """Test tool category extraction"""
+    result = await parse_tools.parse_plugin_interface(sample_readme)
+
+    categories = result["tool_categories"]
+    assert "Category A" in categories
+    assert "Category B" in categories
+    assert "tool_a" in categories["Category A"]
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_interface_features(parse_tools, sample_readme):
+    """Test feature extraction"""
+    result = await parse_tools.parse_plugin_interface(sample_readme)
+
+    features = result["features"]
+    assert "Feature One" in features
+    assert "Feature Two" in features
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_interface_not_found(parse_tools, tmp_path):
+    """Test error when README not found"""
+    result = await parse_tools.parse_plugin_interface(str(tmp_path / "nonexistent"))
+
+    assert "error" in result
+    assert "not found" in result["error"].lower()
+
+
+@pytest.mark.asyncio
+async def test_parse_claude_md_agents(parse_tools, sample_claude_md):
+    """Test agent extraction from CLAUDE.md"""
+    result = await parse_tools.parse_claude_md_agents(sample_claude_md)
+
+    assert "error" not in result
+    assert result["agent_count"] == 2
+
+    agents = result["agents"]
+    agent_names = [a["name"] for a in agents]
+    assert "Planner" in agent_names
+    assert "Executor" in agent_names
+
+
+@pytest.mark.asyncio
+async def test_parse_claude_md_tool_refs(parse_tools, sample_claude_md):
+    """Test tool reference extraction from agents"""
+    result = await parse_tools.parse_claude_md_agents(sample_claude_md)
+
+    agents = {a["name"]: a for a in result["agents"]}
+    planner = agents["Planner"]
+
+    assert "create_issue" in planner["tool_refs"]
+    assert "search_lessons" in planner["tool_refs"]
+
+
+@pytest.mark.asyncio
+async def test_parse_claude_md_not_found(parse_tools, tmp_path):
+    """Test error when CLAUDE.md not found"""
+    result = await parse_tools.parse_claude_md_agents(str(tmp_path / "CLAUDE.md"))
+
+    assert "error" in result
+    assert "not found" in result["error"].lower()
+
+
+@pytest.mark.asyncio
+async def test_parse_plugin_with_direct_file(parse_tools, sample_readme):
+    """Test parsing with direct file path instead of directory"""
+    readme_path = Path(sample_readme) / "README.md"
+    result = await parse_tools.parse_plugin_interface(str(readme_path))
+
+    assert "error" not in result
+    # Plugin name extraction strips "Plugin" suffix
+    assert result["plugin_name"] == "Test"

mcp-servers/contract-validator/tests/test_report_tools.py

@@ -0,0 +1,261 @@
+"""
+Unit tests for report tools.
+"""
+import pytest
+from pathlib import Path
+
+
+@pytest.fixture
+def report_tools():
+    """Create ReportTools instance"""
+    from mcp_server.report_tools import ReportTools
+    return ReportTools()
+
+
+@pytest.fixture
+def sample_marketplace(tmp_path):
+    """Create a sample marketplace structure"""
+    import json
+
+    plugins_dir = tmp_path / "plugins"
+    plugins_dir.mkdir()
+
+    # Plugin 1
+    plugin1 = plugins_dir / "plugin-one"
+    plugin1.mkdir()
+    plugin1_meta = plugin1 / ".claude-plugin"
+    plugin1_meta.mkdir()
+    (plugin1_meta / "plugin.json").write_text(json.dumps({"name": "plugin-one"}))
+    (plugin1 / "README.md").write_text("""# plugin-one
+
+First test plugin.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/cmd-one` | Command one |
+
+## Tools Summary
+
+### Tools (2 tools)
+`tool_a`, `tool_b`
+""")
+
+    # Plugin 2
+    plugin2 = plugins_dir / "plugin-two"
+    plugin2.mkdir()
+    plugin2_meta = plugin2 / ".claude-plugin"
+    plugin2_meta.mkdir()
+    (plugin2_meta / "plugin.json").write_text(json.dumps({"name": "plugin-two"}))
+    (plugin2 / "README.md").write_text("""# plugin-two
+
+Second test plugin.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/cmd-two` | Command two |
+
+## Tools Summary
+
+### Tools (2 tools)
+`tool_c`, `tool_d`
+""")
+
+    # Plugin 3 (with conflict)
+    plugin3 = plugins_dir / "plugin-three"
+    plugin3.mkdir()
+    plugin3_meta = plugin3 / ".claude-plugin"
+    plugin3_meta.mkdir()
+    (plugin3_meta / "plugin.json").write_text(json.dumps({"name": "plugin-three"}))
+    (plugin3 / "README.md").write_text("""# plugin-three
+
+Third test plugin with conflict.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/cmd-one` | Conflicting command |
+
+## Tools Summary
+
+### Tools (1 tool)
+`tool_e`
+""")
+
+    return str(tmp_path)
+
+
+@pytest.fixture
+def marketplace_no_plugins(tmp_path):
+    """Create marketplace with no plugins"""
+    plugins_dir = tmp_path / "plugins"
+    plugins_dir.mkdir()
+    return str(tmp_path)
+
+
+@pytest.fixture
+def marketplace_no_dir(tmp_path):
+    """Create path without plugins directory"""
+    return str(tmp_path)
+
+
+@pytest.mark.asyncio
+async def test_generate_report_json_format(report_tools, sample_marketplace):
+    """Test JSON format report generation"""
+    result = await report_tools.generate_compatibility_report(
+        sample_marketplace, "json"
+    )
+
+    assert "error" not in result
+    assert "generated_at" in result
+    assert "summary" in result
+    assert "plugins" in result
+    assert result["summary"]["total_plugins"] == 3
+
+
+@pytest.mark.asyncio
+async def test_generate_report_markdown_format(report_tools, sample_marketplace):
+    """Test markdown format report generation"""
+    result = await report_tools.generate_compatibility_report(
+        sample_marketplace, "markdown"
+    )
+
+    assert "error" not in result
+    assert "report" in result
+    assert "# Contract Validation Report" in result["report"]
+    assert "## Summary" in result["report"]
+
+
+@pytest.mark.asyncio
+async def test_generate_report_finds_conflicts(report_tools, sample_marketplace):
+    """Test that report finds command conflicts"""
+    result = await report_tools.generate_compatibility_report(
+        sample_marketplace, "json"
+    )
+
+    assert "error" not in result
+    assert result["summary"]["errors"] > 0
+    assert result["summary"]["total_issues"] > 0
+
+
+@pytest.mark.asyncio
+async def test_generate_report_counts_correctly(report_tools, sample_marketplace):
+    """Test summary counts are correct"""
+    result = await report_tools.generate_compatibility_report(
+        sample_marketplace, "json"
+    )
+
+    summary = result["summary"]
+    assert summary["total_plugins"] == 3
+    assert summary["total_commands"] == 3  # 3 commands total
+    assert summary["total_tools"] == 5  # a, b, c, d, e
+
+
+@pytest.mark.asyncio
+async def test_generate_report_no_plugins(report_tools, marketplace_no_plugins):
+    """Test error when no plugins found"""
+    result = await report_tools.generate_compatibility_report(
+        marketplace_no_plugins, "json"
+    )
+
+    assert "error" in result
+    assert "no plugins" in result["error"].lower()
+
+
+@pytest.mark.asyncio
+async def test_generate_report_no_plugins_dir(report_tools, marketplace_no_dir):
+    """Test error when plugins directory doesn't exist"""
+    result = await report_tools.generate_compatibility_report(
+        marketplace_no_dir, "json"
+    )
+
+    assert "error" in result
+    assert "not found" in result["error"].lower()
+
+
+@pytest.mark.asyncio
+async def test_list_issues_all(report_tools, sample_marketplace):
+    """Test listing all issues"""
+    result = await report_tools.list_issues(sample_marketplace, "all", "all")
+
+    assert "error" not in result
+    assert "issues" in result
+    assert result["total_issues"] > 0
+
+
+@pytest.mark.asyncio
+async def test_list_issues_filter_by_severity(report_tools, sample_marketplace):
+    """Test filtering issues by severity"""
+    all_result = await report_tools.list_issues(sample_marketplace, "all", "all")
+    error_result = await report_tools.list_issues(sample_marketplace, "error", "all")
+
+    # Error count should be less than or equal to all
+    assert error_result["total_issues"] <= all_result["total_issues"]
+
+    # All issues should have error severity
+    for issue in error_result["issues"]:
+        sev = issue.get("severity", "")
+        if hasattr(sev, 'value'):
+            sev = sev.value
+        assert "error" in str(sev).lower()
+
+
+@pytest.mark.asyncio
+async def test_list_issues_filter_by_type(report_tools, sample_marketplace):
+    """Test filtering issues by type"""
+    result = await report_tools.list_issues(
+        sample_marketplace, "all", "interface_mismatch"
+    )
+
+    # All issues should have matching type
+    for issue in result["issues"]:
+        itype = issue.get("issue_type", "")
+        if hasattr(itype, 'value'):
+            itype = itype.value
+        assert "interface_mismatch" in str(itype).lower()
+
+
+@pytest.mark.asyncio
+async def test_list_issues_combined_filters(report_tools, sample_marketplace):
+    """Test combined severity and type filters"""
+    result = await report_tools.list_issues(
+        sample_marketplace, "error", "interface_mismatch"
+    )
+
+    assert "error" not in result
+    # Should have command conflict errors
+    assert result["total_issues"] > 0
+
+
+@pytest.mark.asyncio
+async def test_report_markdown_has_all_sections(report_tools, sample_marketplace):
+    """Test markdown report contains all expected sections"""
+    result = await report_tools.generate_compatibility_report(
+        sample_marketplace, "markdown"
+    )
+
+    report = result["report"]
+    assert "## Summary" in report
+    assert "## Plugins" in report
+    # Compatibility section only if there are checks
+    assert "Plugin One" in report or "plugin-one" in report.lower()
+
+
+@pytest.mark.asyncio
+async def test_report_includes_suggestions(report_tools, sample_marketplace):
+    """Test that issues include suggestions"""
+    result = await report_tools.generate_compatibility_report(
+        sample_marketplace, "json"
+    )
+
+    issues = result.get("all_issues", [])
+    # Find an issue with a suggestion
+    issues_with_suggestions = [
+        i for i in issues
+        if i.get("suggestion")
+    ]
+    assert len(issues_with_suggestions) > 0

mcp-servers/contract-validator/tests/test_validation_tools.py

@@ -0,0 +1,256 @@
+"""
+Unit tests for validation tools.
+"""
+import pytest
+from pathlib import Path
+
+
+@pytest.fixture
+def validation_tools():
+    """Create ValidationTools instance"""
+    from mcp_server.validation_tools import ValidationTools
+    return ValidationTools()
+
+
+@pytest.fixture
+def plugin_a(tmp_path):
+    """Create first test plugin"""
+    plugin_dir = tmp_path / "plugin-a"
+    plugin_dir.mkdir()
+    (plugin_dir / ".claude-plugin").mkdir()
+
+    readme = plugin_dir / "README.md"
+    readme.write_text("""# Plugin A
+
+Test plugin A.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/setup-a` | Setup A |
+| `/shared-cmd` | Shared command |
+
+## Tools Summary
+
+### Core (2 tools)
+`tool_one`, `tool_two`
+""")
+    return str(plugin_dir)
+
+
+@pytest.fixture
+def plugin_b(tmp_path):
+    """Create second test plugin"""
+    plugin_dir = tmp_path / "plugin-b"
+    plugin_dir.mkdir()
+    (plugin_dir / ".claude-plugin").mkdir()
+
+    readme = plugin_dir / "README.md"
+    readme.write_text("""# Plugin B
+
+Test plugin B.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/setup-b` | Setup B |
+| `/shared-cmd` | Shared command (conflict!) |
+
+## Tools Summary
+
+### Core (2 tools)
+`tool_two`, `tool_three`
+""")
+    return str(plugin_dir)
+
+
+@pytest.fixture
+def plugin_no_conflict(tmp_path):
+    """Create plugin with no conflicts"""
+    plugin_dir = tmp_path / "plugin-c"
+    plugin_dir.mkdir()
+    (plugin_dir / ".claude-plugin").mkdir()
+
+    readme = plugin_dir / "README.md"
+    readme.write_text("""# Plugin C
+
+Test plugin C.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/unique-cmd` | Unique command |
+
+## Tools Summary
+
+### Core (1 tool)
+`unique_tool`
+""")
+    return str(plugin_dir)
+
+
+@pytest.fixture
+def claude_md_with_agents(tmp_path):
+    """Create CLAUDE.md with agent definitions"""
+    claude_md = tmp_path / "CLAUDE.md"
+    claude_md.write_text("""# CLAUDE.md
+
+### Four-Agent Model
+
+| Agent | Personality | Responsibilities |
+|-------|-------------|------------------|
+| **TestAgent** | Careful | Uses `tool_one`, `tool_two`, `missing_tool` |
+| **ValidAgent** | Thorough | Uses `tool_one` only |
+| **EmptyAgent** | Unknown | General tasks |
+""")
+    return str(claude_md)
+
+
+@pytest.mark.asyncio
+async def test_validate_compatibility_command_conflict(validation_tools, plugin_a, plugin_b):
+    """Test detection of command name conflicts"""
+    result = await validation_tools.validate_compatibility(plugin_a, plugin_b)
+
+    assert "error" not in result
+    assert result["compatible"] is False
+
+    # Find the command conflict issue
+    error_issues = [i for i in result["issues"] if i["severity"].value == "error"]
+    assert len(error_issues) > 0
+    assert any("/shared-cmd" in str(i["message"]) for i in error_issues)
+
+
+@pytest.mark.asyncio
+async def test_validate_compatibility_tool_overlap(validation_tools, plugin_a, plugin_b):
+    """Test detection of tool name overlaps"""
+    result = await validation_tools.validate_compatibility(plugin_a, plugin_b)
+
+    assert "tool_two" in result["shared_tools"]
+
+
+@pytest.mark.asyncio
+async def test_validate_compatibility_unique_tools(validation_tools, plugin_a, plugin_b):
+    """Test identification of unique tools per plugin"""
+    result = await validation_tools.validate_compatibility(plugin_a, plugin_b)
+
+    assert "tool_one" in result["a_only_tools"]
+    assert "tool_three" in result["b_only_tools"]
+
+
+@pytest.mark.asyncio
+async def test_validate_compatibility_no_conflict(validation_tools, plugin_a, plugin_no_conflict):
+    """Test compatible plugins"""
+    result = await validation_tools.validate_compatibility(plugin_a, plugin_no_conflict)
+
+    assert "error" not in result
+    assert result["compatible"] is True
+
+
+@pytest.mark.asyncio
+async def test_validate_compatibility_missing_plugin(validation_tools, plugin_a, tmp_path):
+    """Test error when plugin not found"""
+    result = await validation_tools.validate_compatibility(
+        plugin_a,
+        str(tmp_path / "nonexistent")
+    )
+
+    assert "error" in result
+
+
+@pytest.mark.asyncio
+async def test_validate_agent_refs_with_missing_tools(validation_tools, claude_md_with_agents, plugin_a):
+    """Test detection of missing tool references"""
+    result = await validation_tools.validate_agent_refs(
+        "TestAgent",
+        claude_md_with_agents,
+        [plugin_a]
+    )
+
+    assert "error" not in result
+    assert result["valid"] is False
+    assert "missing_tool" in result["tool_refs_missing"]
+
+
+@pytest.mark.asyncio
+async def test_validate_agent_refs_valid_agent(validation_tools, claude_md_with_agents, plugin_a):
+    """Test valid agent with all tools found"""
+    result = await validation_tools.validate_agent_refs(
+        "ValidAgent",
+        claude_md_with_agents,
+        [plugin_a]
+    )
+
+    assert "error" not in result
+    assert result["valid"] is True
+    assert "tool_one" in result["tool_refs_found"]
+
+
+@pytest.mark.asyncio
+async def test_validate_agent_refs_empty_agent(validation_tools, claude_md_with_agents, plugin_a):
+    """Test agent with no tool references"""
+    result = await validation_tools.validate_agent_refs(
+        "EmptyAgent",
+        claude_md_with_agents,
+        [plugin_a]
+    )
+
+    assert "error" not in result
+    # Should have info issue about undocumented references
+    info_issues = [i for i in result["issues"] if i["severity"].value == "info"]
+    assert len(info_issues) > 0
+
+
+@pytest.mark.asyncio
+async def test_validate_agent_refs_agent_not_found(validation_tools, claude_md_with_agents, plugin_a):
+    """Test error when agent not found"""
+    result = await validation_tools.validate_agent_refs(
+        "NonexistentAgent",
+        claude_md_with_agents,
+        [plugin_a]
+    )
+
+    assert "error" in result
+    assert "not found" in result["error"].lower()
+
+
+@pytest.mark.asyncio
+async def test_validate_data_flow_valid(validation_tools, tmp_path):
+    """Test data flow validation with valid flow"""
+    claude_md = tmp_path / "CLAUDE.md"
+    claude_md.write_text("""# CLAUDE.md
+
+### Four-Agent Model
+
+| Agent | Personality | Responsibilities |
+|-------|-------------|------------------|
+| **DataAgent** | Analytical | Load with `read_csv`, analyze with `describe`, export with `to_csv` |
+""")
+
+    result = await validation_tools.validate_data_flow("DataAgent", str(claude_md))
+
+    assert "error" not in result
+    assert result["valid"] is True
+
+
+@pytest.mark.asyncio
+async def test_validate_data_flow_missing_producer(validation_tools, tmp_path):
+    """Test data flow with consumer but no producer"""
+    claude_md = tmp_path / "CLAUDE.md"
+    claude_md.write_text("""# CLAUDE.md
+
+### Four-Agent Model
+
+| Agent | Personality | Responsibilities |
+|-------|-------------|------------------|
+| **BadAgent** | Careless | Just runs `describe`, `head`, `tail` without loading |
+""")
+
+    result = await validation_tools.validate_data_flow("BadAgent", str(claude_md))
+
+    assert "error" not in result
+    # Should have warning about missing producer
+    warning_issues = [i for i in result["issues"] if i["severity"].value == "warning"]
+    assert len(warning_issues) > 0

plugins/contract-validator/.claude-plugin/plugin.json

@@ -0,0 +1,22 @@
+{
+  "name": "contract-validator",
+  "version": "1.0.0",
+  "description": "Cross-plugin compatibility validation and Claude.md agent verification",
+  "author": {
+    "name": "Leo Miranda",
+    "email": "leobmiranda@gmail.com"
+  },
+  "homepage": "https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace/src/branch/main/plugins/contract-validator/README.md",
+  "repository": "https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace.git",
+  "license": "MIT",
+  "keywords": [
+    "validation",
+    "contracts",
+    "compatibility",
+    "agents",
+    "interfaces",
+    "cross-plugin"
+  ],
+  "commands": ["./commands/"],
+  "mcpServers": ["./.mcp.json"]
+}

plugins/contract-validator/.mcp.json

@@ -0,0 +1,10 @@
+{
+  "mcpServers": {
+    "contract-validator": {
+      "type": "stdio",
+      "command": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/contract-validator/.venv/bin/python",
+      "args": ["-m", "mcp_server.server"],
+      "cwd": "${CLAUDE_PLUGIN_ROOT}/mcp-servers/contract-validator"
+    }
+  }
+}

plugins/contract-validator/README.md

@@ -0,0 +1,156 @@
+# contract-validator Plugin
+
+Cross-plugin compatibility validation and CLAUDE.md agent verification for Claude Code plugin marketplaces.
+
+## Problem Statement
+
+As plugin marketplaces grow, several compatibility issues emerge:
+
+- **Command conflicts**: Multiple plugins defining the same slash command (e.g., `/initial-setup`)
+- **Tool name overlaps**: Different plugins using identical tool names with incompatible interfaces
+- **Undocumented dependencies**: Agents referencing tools that don't exist
+- **Broken data flows**: Agent sequences that expect outputs not produced by prior steps
+
+Contract-validator solves these by parsing plugin interfaces and validating compatibility before runtime.
+
+## Features
+
+- **Interface Parsing**: Extract commands, agents, and tools from plugin README.md files
+- **Agent Extraction**: Parse CLAUDE.md Four-Agent Model tables and Agents sections
+- **Compatibility Checks**: Pairwise validation between all plugins in a marketplace
+- **Data Flow Validation**: Verify agent tool sequences have valid data producers/consumers
+- **Comprehensive Reports**: Markdown or JSON reports with actionable suggestions
+
+## Installation
+
+This plugin is part of the leo-claude-mktplace. Install via:
+
+```bash
+# From marketplace
+claude plugins install leo-claude-mktplace/contract-validator
+
+# Setup MCP server venv
+cd ~/.claude/plugins/marketplaces/leo-claude-mktplace/mcp-servers/contract-validator
+python -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt
+```
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/validate-contracts` | Full marketplace compatibility validation |
+| `/check-agent` | Validate single agent definition |
+| `/list-interfaces` | Show all plugin interfaces |
+
+## Agents
+
+| Agent | Description |
+|-------|-------------|
+| `full-validation` | Complete cross-plugin compatibility validation |
+| `agent-check` | Single agent definition verification |
+
+## Tools Summary
+
+### Parse Tools (2)
+- `parse_plugin_interface` - Extract interface from plugin README.md
+- `parse_claude_md_agents` - Extract agents from CLAUDE.md
+
+### Validation Tools (3)
+- `validate_compatibility` - Check two plugins for conflicts
+- `validate_agent_refs` - Verify agent tool references exist
+- `validate_data_flow` - Check data flow through agent sequences
+
+### Report Tools (2)
+- `generate_compatibility_report` - Full marketplace validation report
+- `list_issues` - Filter issues by severity or type
+
+## Example Workflow
+
+```
+/validate-contracts ~/claude-plugins-work
+
+# Output:
+# Contract Validation Report
+#
+# | Metric     | Count |
+# |------------|-------|
+# | Plugins    | 12    |
+# | Commands   | 39    |
+# | Tools      | 32    |
+# | **Issues** | **7** |
+# | - Errors   | 3     |
+# | - Warnings | 0     |
+# | - Info     | 4     |
+#
+# ## Issues Found
+# [ERROR] Command conflict: projman and data-platform both define /initial-setup
+# [ERROR] Command conflict: projman and pr-review both define /initial-setup
+# ...
+```
+
+```
+/check-agent Planner ./CLAUDE.md
+
+# Output:
+# Agent: Planner
+# Status: VALID
+#
+# Tool References Found (3):
+# - create_issue ✓
+# - search_lessons ✓
+# - get_execution_order ✓
+#
+# Data Flow: No issues detected
+```
+
+## Issue Types
+
+| Type | Severity | Description |
+|------|----------|-------------|
+| `interface_mismatch` | ERROR | Command name conflict between plugins |
+| `missing_tool` | ERROR | Agent references non-existent tool |
+| `interface_mismatch` | WARNING | Tool name overlap (different plugins) |
+| `optional_dependency` | WARNING | Agent uses tool from non-required plugin |
+| `undeclared_output` | INFO | Agent has no documented tool references |
+
+## Parsed Interface Structure
+
+When parsing a plugin README.md, the following structure is extracted:
+
+```json
+{
+  "plugin_name": "data-platform",
+  "description": "Data engineering tools...",
+  "commands": [
+    {"name": "/ingest", "description": "Load data..."}
+  ],
+  "agents": [
+    {"name": "data-analysis", "description": "..."}
+  ],
+  "tools": [
+    {"name": "read_csv", "category": "pandas"}
+  ],
+  "tool_categories": {
+    "pandas": ["read_csv", "to_csv", ...],
+    "PostgreSQL": ["pg_query", ...]
+  },
+  "features": ["pandas Operations", "PostgreSQL/PostGIS", ...]
+}
+```
+
+## Best Practices
+
+### For Plugin Authors
+
+1. **Use unique command names**: Prefix with plugin name if generic (e.g., `/data-setup` vs `/initial-setup`)
+2. **Document all tools**: Include tool names in README.md with backticks
+3. **Specify tool categories**: Use `### Category (N tools)` headers
+4. **Declare agent tools**: List tools used by agents in their definitions
+
+### For Marketplace Maintainers
+
+1. **Run validation before merging**: Use `/validate-contracts` in CI/CD
+2. **Review warnings**: Tool overlaps may indicate design issues
+3. **Track issues over time**: Use JSON format for programmatic tracking

plugins/contract-validator/agents/agent-check.md

@@ -0,0 +1,90 @@
+# Agent Check Agent
+
+You are an agent definition validator. Your role is to verify that a specific agent's tool references and data flow are valid.
+
+## Capabilities
+
+- Parse agent definitions from CLAUDE.md
+- Validate tool references against available plugins
+- Verify data flow patterns through agent sequences
+- Provide detailed validation feedback
+
+## Available Tools
+
+### Parsing
+- `parse_claude_md_agents` - Extract all agents from CLAUDE.md
+- `parse_plugin_interface` - Extract interface from plugin (for available tools)
+
+### Validation
+- `validate_agent_refs` - Check agent tool references exist
+- `validate_data_flow` - Verify data flow through agent sequence
+
+### Reporting
+- `list_issues` - Filter issues for this agent
+
+## Workflow
+
+1. **Locate the agent**:
+   - Use `parse_claude_md_agents` on specified CLAUDE.md
+   - Find agent by name (case-insensitive match)
+   - If not found, list available agents
+
+2. **Gather available tools**:
+   - Scan plugins directory for available plugins
+   - For each plugin, use `parse_plugin_interface`
+   - Build set of all available tool names
+
+3. **Validate tool references**:
+   - Use `validate_agent_refs` with agent name and plugin paths
+   - Report found tools (valid references)
+   - Report missing tools (errors)
+   - Suggest corrections for typos
+
+4. **Validate data flow**:
+   - Use `validate_data_flow` to check sequence
+   - Verify data producers precede consumers
+   - Check for orphaned data references
+   - Identify potential flow issues
+
+5. **Report findings**:
+   - Agent name and source file
+   - Responsibilities extracted
+   - Tool references: found vs missing
+   - Data flow validation results
+   - Suggestions for improvement
+
+## Validation Rules
+
+### Tool Reference Rules
+- All referenced tools must exist in available plugins
+- Tool names are case-sensitive
+- Partial matches suggest typos
+
+### Data Flow Rules
+- Data producers (read_csv, pg_query, etc.) should precede consumers
+- Data consumers (describe, head, to_csv, etc.) need valid data_ref
+- Workflow steps should have logical sequence
+
+## Issue Severities
+
+- **ERROR**: Tool reference not found - agent will fail
+- **WARNING**: Data flow issue - agent may produce unexpected results
+- **INFO**: Undocumented reference - consider adding documentation
+
+## Example Interaction
+
+**User**: /check-agent Orchestrator
+
+**Agent**:
+1. Parses CLAUDE.md, finds Orchestrator agent
+2. Extracts responsibilities: "Sprint execution, parallel batching, Git operations"
+3. Finds tool refs: create_issue, update_issue, search_lessons
+4. Validates against plugins: all tools found in projman/gitea
+5. Validates data flow: no data producers/consumers used
+6. Reports: "Agent Orchestrator: VALID - all 3 tool references found"
+
+**User**: /check-agent InvalidAgent
+
+**Agent**:
+1. Parses CLAUDE.md, agent not found
+2. Reports: "Agent 'InvalidAgent' not found. Available agents: Planner, Orchestrator, Executor, Code Reviewer"

plugins/contract-validator/agents/full-validation.md

@@ -0,0 +1,87 @@
+# Full Validation Agent
+
+You are a contract validation specialist. Your role is to perform comprehensive cross-plugin compatibility validation for the entire marketplace.
+
+## Capabilities
+
+- Parse plugin interfaces from README.md files
+- Parse agent definitions from CLAUDE.md files
+- Validate cross-plugin compatibility
+- Identify interface mismatches and conflicts
+- Generate detailed validation reports
+
+## Available Tools
+
+### Parsing
+- `parse_plugin_interface` - Extract interface from plugin README.md
+- `parse_claude_md_agents` - Extract agents from CLAUDE.md
+
+### Validation
+- `validate_compatibility` - Check two plugins for conflicts
+- `validate_agent_refs` - Verify agent tool references exist
+- `validate_data_flow` - Check data flow through agent sequences
+
+### Reporting
+- `generate_compatibility_report` - Full marketplace report
+- `list_issues` - Filter issues by severity/type
+
+## Workflow
+
+1. **Discover plugins**:
+   - Locate marketplace plugins directory
+   - Identify plugins by `.claude-plugin/` marker
+   - Build list of all plugins to validate
+
+2. **Parse all interfaces**:
+   - For each plugin, use `parse_plugin_interface`
+   - Extract commands, agents, tools from README.md
+   - Track tool categories and features
+
+3. **Run pairwise compatibility checks**:
+   - For each pair of plugins, use `validate_compatibility`
+   - Check for command name conflicts (ERROR)
+   - Check for tool name overlaps (WARNING)
+   - Identify interface mismatches
+
+4. **Validate CLAUDE.md agents** (if present):
+   - Use `parse_claude_md_agents` on project CLAUDE.md
+   - For each agent, use `validate_agent_refs`
+   - Use `validate_data_flow` to check sequences
+
+5. **Generate comprehensive report**:
+   - Use `generate_compatibility_report`
+   - Format: markdown for human review, JSON for programmatic use
+   - Include summary statistics and detailed findings
+
+## Report Structure
+
+### Summary
+- Total plugins scanned
+- Total commands, agents, tools found
+- Issue counts by severity (error/warning/info)
+
+### Compatibility Matrix
+- Plugin pairs with conflicts
+- Shared tools between plugins
+- Unique tools per plugin
+
+### Issues List
+- ERROR: Command name conflicts (must fix)
+- WARNING: Tool name overlaps (review needed)
+- INFO: Undocumented references (improve docs)
+
+### Recommendations
+- Actionable suggestions per issue
+- Priority order for fixes
+
+## Example Interaction
+
+**User**: /validate-contracts ~/claude-plugins-work
+
+**Agent**:
+1. Discovers 12 plugins in marketplace
+2. Parses all README.md files
+3. Runs 66 pairwise compatibility checks
+4. Finds 3 errors, 4 warnings
+5. Reports: "Command conflict: projman and data-platform both define /initial-setup"
+6. Suggests: "Rename one command to avoid ambiguity"

plugins/contract-validator/claude-md-integration.md

@@ -0,0 +1,152 @@
+# contract-validator Plugin - CLAUDE.md Integration
+
+Add this section to your marketplace or project's CLAUDE.md to enable contract validation features.
+
+## Suggested CLAUDE.md Section
+
+```markdown
+## Contract Validation
+
+This marketplace uses the contract-validator plugin for cross-plugin compatibility checks.
+
+### Available Commands
+
+| Command | Purpose |
+|---------|---------|
+| `/validate-contracts` | Full marketplace compatibility validation |
+| `/check-agent` | Validate single agent definition |
+| `/list-interfaces` | Show all plugin interfaces |
+
+### Validation Workflow
+
+Run before merging plugin changes:
+
+1. `/validate-contracts` - Check for conflicts
+2. Review errors (must fix) and warnings (should review)
+3. Fix issues before merging
+
+### Interface Documentation Standards
+
+For plugins to be validated correctly, document interfaces in README.md:
+
+**Commands Section:**
+```markdown
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/my-command` | What it does |
+```
+
+**Tools Section:**
+```markdown
+## Tools Summary
+
+### Category (N tools)
+`tool_a`, `tool_b`, `tool_c`
+```
+
+**Agents Section:**
+```markdown
+## Agents
+
+| Agent | Description |
+|-------|-------------|
+| `my-agent` | What it does |
+```
+```
+
+## Declaring Agent Tool References
+
+For agent validation to work, document tool usage in CLAUDE.md:
+
+### Option 1: Four-Agent Model Table
+
+```markdown
+### Four-Agent Model
+
+| Agent | Personality | Responsibilities |
+|-------|-------------|------------------|
+| **Planner** | Methodical | Planning via `create_issue`, `search_lessons` |
+```
+
+### Option 2: Agent Sections
+
+```markdown
+### Planner Agent
+
+Uses these tools:
+- `create_issue` - Create planning issues
+- `search_lessons` - Find relevant lessons
+```
+
+## Best Practices for Plugin Authors
+
+### Unique Command Names
+
+Avoid generic names that may conflict:
+
+```markdown
+# BAD - Will conflict with other plugins
+| `/setup` | Setup wizard |
+
+# GOOD - Plugin-specific prefix
+| `/data-setup` | Data platform setup wizard |
+```
+
+### Document All Tools
+
+Ensure every MCP tool is listed in README.md:
+
+```markdown
+## Tools Summary
+
+### pandas (14 tools)
+`read_csv`, `read_parquet`, `read_json`, `to_csv`, `to_parquet`,
+`describe`, `head`, `tail`, `filter`, `select`, `groupby`, `join`,
+`list_data`, `drop_data`
+```
+
+### Specify Dependencies
+
+If agents depend on tools from other plugins, document it:
+
+```markdown
+## Dependencies
+
+This agent uses tools from:
+- `projman` - Issue management (`create_issue`, `update_issue`)
+- `data-platform` - Data loading (`read_csv`, `describe`)
+```
+
+## Typical Workflows
+
+### Pre-Merge Validation
+
+```
+# Before merging new plugin
+/validate-contracts
+
+# Check specific agent after changes
+/check-agent Orchestrator
+```
+
+### Plugin Development
+
+```
+# See what interfaces exist
+/list-interfaces
+
+# After adding new command, verify no conflicts
+/validate-contracts
+```
+
+### CI/CD Integration
+
+Add to your pipeline:
+
+```yaml
+- name: Validate Plugin Contracts
+  run: |
+    claude --skill contract-validator:validate-contracts --args "${{ github.workspace }}"
+```

plugins/contract-validator/commands/check-agent.md

@@ -0,0 +1,51 @@
+# /check-agent - Validate Agent Definition
+
+Validate a single agent's tool references and data flow.
+
+## Usage
+
+```
+/check-agent <agent_name> [claude_md_path]
+```
+
+## Parameters
+
+- `agent_name` (required): Name of the agent to validate (e.g., "Planner", "Orchestrator")
+- `claude_md_path` (optional): Path to CLAUDE.md file. Defaults to `./CLAUDE.md`
+
+## Workflow
+
+1. **Parse agent definition**:
+   - Locate agent in CLAUDE.md (Four-Agent Model table or Agents section)
+   - Extract responsibilities, tool references, workflow steps
+
+2. **Validate tool references**:
+   - Check each referenced tool exists in available plugins
+   - Report missing or misspelled tool names
+   - Suggest corrections for common mistakes
+
+3. **Validate data flow**:
+   - Analyze sequence of tools in agent workflow
+   - Verify data producers precede data consumers
+   - Check for orphaned data references
+
+4. **Report findings**:
+   - List all tool references found
+   - List any missing tools
+   - Data flow validation results
+   - Suggestions for improvement
+
+## Examples
+
+```
+/check-agent Planner
+/check-agent Orchestrator ./CLAUDE.md
+/check-agent data-analysis ~/project/CLAUDE.md
+```
+
+## Available Tools
+
+Use these MCP tools:
+- `validate_agent_refs` - Check agent tool references exist
+- `validate_data_flow` - Verify data flow through agent sequence
+- `parse_claude_md_agents` - Parse all agents from CLAUDE.md

plugins/contract-validator/commands/list-interfaces.md

@@ -0,0 +1,58 @@
+# /list-interfaces - Show Plugin Interfaces
+
+Display what each plugin in the marketplace produces and accepts.
+
+## Usage
+
+```
+/list-interfaces [marketplace_path]
+```
+
+## Parameters
+
+- `marketplace_path` (optional): Path to marketplace root. Defaults to current project root.
+
+## Workflow
+
+1. **Discover plugins**:
+   - Scan plugins directory for all plugins with `.claude-plugin/` marker
+   - Read each plugin's README.md
+
+2. **Parse interfaces**:
+   - Extract commands (slash commands offered by plugin)
+   - Extract agents (autonomous agents defined)
+   - Extract tools (MCP tools provided)
+   - Identify tool categories and features
+
+3. **Display summary**:
+   - Table of plugins with command/agent/tool counts
+   - Detailed breakdown per plugin
+   - Tool categories and their contents
+
+## Output Format
+
+```
+| Plugin      | Commands | Agents | Tools |
+|-------------|----------|--------|-------|
+| projman     | 12       | 4      | 26    |
+| data-platform| 7       | 2      | 32    |
+| ...         | ...      | ...    | ...   |
+
+## projman
+- Commands: /sprint-plan, /sprint-start, ...
+- Agents: Planner, Orchestrator, Executor, Code Reviewer
+- Tools: list_issues, create_issue, ...
+```
+
+## Examples
+
+```
+/list-interfaces
+/list-interfaces ~/claude-plugins-work
+```
+
+## Available Tools
+
+Use these MCP tools:
+- `parse_plugin_interface` - Parse individual plugin README
+- `generate_compatibility_report` - Get full interface data (JSON format)

plugins/contract-validator/commands/validate-contracts.md

@@ -0,0 +1,50 @@
+# /validate-contracts - Full Contract Validation
+
+Run comprehensive cross-plugin compatibility validation for the entire marketplace.
+
+## Usage
+
+```
+/validate-contracts [marketplace_path]
+```
+
+## Parameters
+
+- `marketplace_path` (optional): Path to marketplace root. Defaults to current project root.
+
+## Workflow
+
+1. **Discover plugins**:
+   - Scan plugins directory for all plugins with `.claude-plugin/` marker
+   - Parse each plugin's README.md to extract interface
+
+2. **Run compatibility checks**:
+   - Perform pairwise compatibility validation between all plugins
+   - Check for command name conflicts
+   - Check for tool name overlaps
+   - Identify interface mismatches
+
+3. **Validate CLAUDE.md agents**:
+   - Parse agent definitions from CLAUDE.md
+   - Validate all tool references exist
+   - Check data flow through agent sequences
+
+4. **Generate report**:
+   - Summary statistics (plugins, commands, tools, issues)
+   - Detailed findings by severity (error, warning, info)
+   - Actionable suggestions for each issue
+
+## Examples
+
+```
+/validate-contracts
+/validate-contracts ~/claude-plugins-work
+```
+
+## Available Tools
+
+Use these MCP tools:
+- `generate_compatibility_report` - Generate full marketplace report
+- `list_issues` - Filter issues by severity or type
+- `parse_plugin_interface` - Parse individual plugin interface
+- `validate_compatibility` - Check two plugins for conflicts

plugins/contract-validator/mcp-servers/contract-validator

@@ -0,0 +1 @@
+../../../mcp-servers/contract-validator