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MCP server manifest checker (.well-known/mcp.json)

We fetch /.well-known/mcp.json (or /.well-known/mcp/server-card.json), parse it, then send an initialize request to the endpoint URL it declares.

Why it matters

MCP lets an agent attach to your tools with no custom integration. A manifest with nothing answering behind it is worse than none, because the agent tries and fails. A valid manifest scores 2; an endpoint that replies with JSON-RPC to initialize brings it to 4.

How to fix it

1. Publish JSON at /.well-known/mcp.json with a url or endpoint field.
2. Point that URL at an MCP server that accepts POST with Content-Type: application/json.
3. Make the server answer the initialize method with a JSON-RPC result.
4. Return JSON with a JSON content type, not an HTML page.

How to verify

Run curl -s https://example.com/.well-known/mcp.json | jq . and POST an initialize request to the endpoint it names.

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