feat(contract-validator): add gate contract versioning

- design-gate.md and data-gate.md declare gate_contract: v1
- domain-consultation.md Gate Command Reference includes Contract column
- validate_workflow_integration now checks contract version compatibility
- Tests added for match, mismatch, and missing contract scenarios

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -133,7 +133,7 @@ class ContractValidatorMCPServer:
                 ),
                 Tool(
                     name="validate_workflow_integration",
-                    description="Validate that a domain plugin exposes the required advisory interfaces (gate command, review command, advisory agent) expected by projman's domain-consultation skill",
+                    description="Validate that a domain plugin exposes the required advisory interfaces (gate command, review command, advisory agent) expected by projman's domain-consultation skill. Also checks gate contract version compatibility.",
                     inputSchema={
                         "type": "object",
                         "properties": {
@@ -144,6 +144,10 @@ class ContractValidatorMCPServer:
                             "domain_label": {
                                 "type": "string",
                                 "description": "The Domain/* label it claims to handle, e.g. Domain/Viz"
+                            },
+                            "expected_contract": {
+                                "type": "string",
+                                "description": "Expected contract version (e.g., 'v1'). If provided, validates the gate command's contract matches."
                             }
                         },
                         "required": ["plugin_path", "domain_label"]
@@ -261,9 +265,16 @@ class ContractValidatorMCPServer:
         """Validate agent data flow"""
         return await self.validation_tools.validate_data_flow(agent_name, claude_md_path)
 
-    async def _validate_workflow_integration(self, plugin_path: str, domain_label: str) -> dict:
+    async def _validate_workflow_integration(
+        self,
+        plugin_path: str,
+        domain_label: str,
+        expected_contract: str = None
+    ) -> dict:
         """Validate domain plugin exposes required advisory interfaces"""
-        return await self.validation_tools.validate_workflow_integration(plugin_path, domain_label)
+        return await self.validation_tools.validate_workflow_integration(
+            plugin_path, domain_label, expected_contract
+        )
 
     # Report tool implementations (Issue #188)
 

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

@@ -72,6 +72,7 @@ class WorkflowIntegrationResult(BaseModel):
     domain_label: str
     valid: bool
     gate_command_found: bool
+    gate_contract: Optional[str] = None  # Contract version declared by gate command
     review_command_found: bool
     advisory_agent_found: bool
     issues: list[ValidationIssue] = []
@@ -349,22 +350,32 @@ class ValidationTools:
 
         return result.model_dump()
 
-    async def validate_workflow_integration(self, plugin_path: str, domain_label: str) -> dict:
+    async def validate_workflow_integration(
+        self,
+        plugin_path: str,
+        domain_label: str,
+        expected_contract: Optional[str] = None
+    ) -> dict:
         """
         Validate that a domain plugin exposes required advisory interfaces.
 
         Checks for:
         - Gate command (e.g., /design-gate, /data-gate) - REQUIRED
+        - Gate contract version (gate_contract in frontmatter) - INFO if missing
         - Review command (e.g., /design-review, /data-review) - recommended
         - Advisory agent referencing the domain label - recommended
 
         Args:
             plugin_path: Path to the domain plugin directory
             domain_label: The Domain/* label it claims to handle (e.g., Domain/Viz)
+            expected_contract: Expected contract version (e.g., 'v1'). If provided,
+                              validates the gate command's contract matches.
 
         Returns:
             Validation result with found interfaces and issues
         """
+        import re
+
         plugin_path_obj = Path(plugin_path)
         issues = []
 
@@ -383,6 +394,7 @@ class ValidationTools:
         # Check for gate command
         commands_dir = plugin_path_obj / "commands"
         gate_command_found = False
+        gate_contract = None
         gate_patterns = ["pass", "fail", "PASS", "FAIL", "Binary pass/fail", "gate"]
 
         if commands_dir.exists():
@@ -392,6 +404,13 @@ class ValidationTools:
                     content = cmd_file.read_text()
                     if any(pattern in content for pattern in gate_patterns):
                         gate_command_found = True
+                        # Parse frontmatter for gate_contract
+                        frontmatter_match = re.match(r'^---\n(.*?)\n---', content, re.DOTALL)
+                        if frontmatter_match:
+                            frontmatter = frontmatter_match.group(1)
+                            contract_match = re.search(r'gate_contract:\s*(\S+)', frontmatter)
+                            if contract_match:
+                                gate_contract = contract_match.group(1)
                         break
 
         if not gate_command_found:
@@ -441,11 +460,31 @@ class ValidationTools:
                 suggestion=f"Create agents/{domain_short}-advisor.md referencing '{domain_label}'"
             ))
 
+        # Check gate contract version
+        if gate_command_found:
+            if not gate_contract:
+                issues.append(ValidationIssue(
+                    severity=IssueSeverity.INFO,
+                    issue_type=IssueType.MISSING_INTEGRATION,
+                    message=f"Gate command does not declare a contract version",
+                    location=str(commands_dir),
+                    suggestion="Consider adding `gate_contract: v1` to frontmatter for version tracking"
+                ))
+            elif expected_contract and gate_contract != expected_contract:
+                issues.append(ValidationIssue(
+                    severity=IssueSeverity.WARNING,
+                    issue_type=IssueType.INTERFACE_MISMATCH,
+                    message=f"Contract version mismatch: gate declares {gate_contract}, projman expects {expected_contract}",
+                    location=str(commands_dir),
+                    suggestion=f"Update domain-consultation.md Gate Command Reference table to {gate_contract}, or update gate command to {expected_contract}"
+                ))
+
         result = WorkflowIntegrationResult(
             plugin_name=plugin_name,
             domain_label=domain_label,
             valid=gate_command_found,  # Only gate is required for validity
             gate_command_found=gate_command_found,
+            gate_contract=gate_contract,
             review_command_found=review_command_found,
             advisory_agent_found=advisory_agent_found,
             issues=issues

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

@@ -404,3 +404,108 @@ async def test_validate_workflow_integration_nonexistent_plugin(validation_tools
 
     assert "error" in result
     assert "not found" in result["error"].lower()
+
+
+# --- Gate Contract Version Tests ---
+
+@pytest.fixture
+def domain_plugin_with_contract(tmp_path):
+    """Create domain plugin with gate_contract: v1 in frontmatter"""
+    plugin_dir = tmp_path / "viz-platform-versioned"
+    plugin_dir.mkdir()
+    (plugin_dir / ".claude-plugin").mkdir()
+    (plugin_dir / "commands").mkdir()
+    (plugin_dir / "agents").mkdir()
+
+    # Gate command with gate_contract in frontmatter
+    gate_cmd = plugin_dir / "commands" / "design-gate.md"
+    gate_cmd.write_text("""---
+description: Design system compliance gate (pass/fail)
+gate_contract: v1
+---
+
+# /design-gate
+
+Binary pass/fail validation gate for design system compliance.
+
+## Output
+
+- **PASS**: All design system checks passed
+- **FAIL**: Design system violations detected
+""")
+
+    # Review command
+    review_cmd = plugin_dir / "commands" / "design-review.md"
+    review_cmd.write_text("""# /design-review
+
+Comprehensive design system audit.
+""")
+
+    # Advisory agent
+    agent = plugin_dir / "agents" / "design-reviewer.md"
+    agent.write_text("""# design-reviewer
+
+Design system compliance auditor for Domain/Viz issues.
+""")
+
+    return str(plugin_dir)
+
+
+@pytest.mark.asyncio
+async def test_validate_workflow_contract_match(validation_tools, domain_plugin_with_contract):
+    """Test that matching expected_contract produces no warning"""
+    result = await validation_tools.validate_workflow_integration(
+        domain_plugin_with_contract,
+        "Domain/Viz",
+        expected_contract="v1"
+    )
+
+    assert "error" not in result
+    assert result["valid"] is True
+    assert result["gate_contract"] == "v1"
+
+    # Should have no warnings about contract mismatch
+    warning_issues = [i for i in result["issues"] if i["severity"].value == "warning"]
+    contract_warnings = [i for i in warning_issues if "contract" in i["message"].lower()]
+    assert len(contract_warnings) == 0
+
+
+@pytest.mark.asyncio
+async def test_validate_workflow_contract_mismatch(validation_tools, domain_plugin_with_contract):
+    """Test that mismatched expected_contract produces WARNING"""
+    result = await validation_tools.validate_workflow_integration(
+        domain_plugin_with_contract,
+        "Domain/Viz",
+        expected_contract="v2"  # Gate has v1
+    )
+
+    assert "error" not in result
+    assert result["valid"] is True  # Contract mismatch doesn't affect validity
+    assert result["gate_contract"] == "v1"
+
+    # Should have warning about contract mismatch
+    warning_issues = [i for i in result["issues"] if i["severity"].value == "warning"]
+    contract_warnings = [i for i in warning_issues if "contract" in i["message"].lower()]
+    assert len(contract_warnings) == 1
+    assert "mismatch" in contract_warnings[0]["message"].lower()
+    assert "v1" in contract_warnings[0]["message"]
+    assert "v2" in contract_warnings[0]["message"]
+
+
+@pytest.mark.asyncio
+async def test_validate_workflow_no_contract(validation_tools, domain_plugin_complete):
+    """Test that missing gate_contract produces INFO suggestion"""
+    result = await validation_tools.validate_workflow_integration(
+        domain_plugin_complete,
+        "Domain/Viz"
+    )
+
+    assert "error" not in result
+    assert result["valid"] is True
+    assert result["gate_contract"] is None
+
+    # Should have info issue about missing contract
+    info_issues = [i for i in result["issues"] if i["severity"].value == "info"]
+    contract_info = [i for i in info_issues if "contract" in i["message"].lower()]
+    assert len(contract_info) == 1
+    assert "does not declare" in contract_info[0]["message"].lower()