LangChain Agent MCP Server

# SlashMCP Integration Guide ## Correct Service URL **✅ Correct URL:** ``` https://langchain-agent-mcp-server-554655392699.us-central1.run.app ``` **❌ Incorrect URL (has typo):** ``` https://langchain-agent-mcp-server-554655392699.us-centrall.run.app ``` ## Register in SlashMCP ### Step 1: Remove the Incorrect Registration In SlashMCP, run: ``` /slashmcp remove langchain-agent ``` ### Step 2: Add with Correct URL ``` /slashmcp add langchain-agent https://langchain-agent-mcp-server-554655392699.us-central1.run.app ``` ### Step 3: Verify Registration ``` /slashmcp list ``` You should see: - `langchain-agent (srv_xxxxx)` - active, auth: no auth ## Using the Agent Once registered correctly, invoke the agent: ``` /srv_xxxxx agent_executor query="What is the capital of France?" ``` Or using the server ID directly: ``` /slashmcp invoke srv_xxxxx agent_executor query="Your question here" ``` ## MCP Endpoints The service exposes these MCP-compliant endpoints: 1. **GET /mcp/manifest** - Returns tool definitions 2. **POST /mcp/invoke** - Executes the agent ### Expected Request Format ```json { "tool": "agent_executor", "arguments": { "query": "Your question here" } } ``` ### Expected Response Format ```json { "content": [ { "type": "text", "text": "Agent response here..." } ], "isError": false } ``` ## Troubleshooting ### 404 Errors If you get 404 errors: 1. ✅ Verify the URL is correct (no typos) 2. ✅ Check the service is running: `https://langchain-agent-mcp-server-554655392699.us-central1.run.app/health` 3. ✅ Verify manifest endpoint: `https://langchain-agent-mcp-server-554655392699.us-central1.run.app/mcp/manifest` ### Gateway Request Failed If "MCP gateway request failed": - The SlashMCP gateway might be trying to access a different endpoint - Verify the service URL is accessible from the internet - Check if there are any CORS issues (should be configured to allow all origins) ### Agent Not Responding If the agent doesn't respond: 1. Check service logs: ```powershell gcloud run services logs read langchain-agent-mcp-server ` --platform managed ` --region us-central1 ` --project slashmcp ``` 2. Verify API key is set correctly 3. Test the endpoint directly: ```powershell $body = @{ tool = "agent_executor" arguments = @{ query = "test" } } | ConvertTo-Json Invoke-WebRequest -Uri "https://langchain-agent-mcp-server-554655392699.us-central1.run.app/mcp/invoke" ` -Method POST ` -ContentType "application/json" ` -Body $body ``` ## Service Status - **Status:** ✅ Running - **URL:** https://langchain-agent-mcp-server-554655392699.us-central1.run.app - **API Key:** ✅ Configured - **Endpoints:** ✅ Working --- **Fix the typo in the URL and re-register to resolve the 404 errors!**