Add MCP docs server to Claude Code GitHub Action

- Add .mcp.json with mcp-docs HTTP server configuration
- Update claude.yml to load MCP server config with --mcp-config
- Change --system-prompt to --append-system-prompt to preserve defaults
- Extend instructions to use mcp-docs for MCP-related work

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.github/workflows/claude.yml

@@ -44,5 +44,6 @@ jobs:
           assignee_trigger: "claude"
 
           claude_args: |
+            --mcp-config .mcp.json
             --allowedTools Bash
-            --system-prompt "If posting a comment to GitHub, give a concise summary of the comment at the top and put all the details in a <details> block."
+            --append-system-prompt "If posting a comment to GitHub, give a concise summary of the comment at the top and put all the details in a <details> block. When working on MCP-related code or reviewing MCP-related changes, use the mcp-docs MCP server to look up the latest protocol documentation. For schema details, reference https://github.com/modelcontextprotocol/modelcontextprotocol/tree/main/schema which contains versioned schemas in JSON (schema.json) and TypeScript (schema.ts) formats."

.mcp.json

@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "mcp-docs": {
+      "type": "http",
+      "url": "https://modelcontextprotocol.io/mcp"
+    }
+  }
+}