diff --git a/CLAUDE.md b/CLAUDE.md
index 3e1d326..b4eb294 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -163,6 +163,12 @@ leo-claude-mktplace/
 - **MCP server venv path**: `${CLAUDE_PLUGIN_ROOT}/mcp-servers/{name}/.venv/bin/python`
 - **CLI tools forbidden** - Use MCP tools exclusively (never `tea`, `gh`, etc.)
 
+#### ⚠️ plugin.json Format Rules (CRITICAL)
+- **Hooks MUST be inline** - NEVER use `"hooks": "path/to/file.json"`
+- **Agents auto-discover** - NEVER add `"agents": ["./agents/"]` - .md files found automatically
+- **Always validate** - Run `./scripts/validate-marketplace.sh` before committing
+- See lesson: `lessons/patterns/plugin-manifest-validation---hooks-and-agents-format-requirements`
+
 ### Hooks (Valid Events Only)
 `PreToolUse`, `PostToolUse`, `UserPromptSubmit`, `SessionStart`, `SessionEnd`, `Notification`, `Stop`, `SubagentStop`, `PreCompact`
 
diff --git a/plugins/data-platform/.claude-plugin/plugin.json b/plugins/data-platform/.claude-plugin/plugin.json
index d15138c..00bae91 100644
--- a/plugins/data-platform/.claude-plugin/plugin.json
+++ b/plugins/data-platform/.claude-plugin/plugin.json
@@ -18,8 +18,14 @@
     "etl",
     "dataframe"
   ],
-  "hooks": "hooks/hooks.json",
+  "hooks": {
+    "SessionStart": [
+      {
+        "type": "command",
+        "command": "${CLAUDE_PLUGIN_ROOT}/hooks/startup-check.sh"
+      }
+    ]
+  },
   "commands": ["./commands/"],
-  "agents": ["./agents/"],
   "mcpServers": ["./.mcp.json"]
 }
diff --git a/plugins/data-platform/hooks/hooks.json b/plugins/data-platform/hooks/hooks.json
deleted file mode 100644
index 529b5ec..0000000
--- a/plugins/data-platform/hooks/hooks.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "hooks": {
-    "SessionStart": [
-      {
-        "type": "command",
-        "command": "${CLAUDE_PLUGIN_ROOT}/hooks/startup-check.sh"
-      }
-    ]
-  }
-}