DF0051: Instance Has No MCP Endpoint

Message

The devframe instance on port {port} has no MCP endpoint.

Cause

The devframe connect gateway tool devframe_connect_call-tool targeted a live devframe instance that runs without an MCP route — its __connection.json advertises no mcp entry, so there is no endpoint to proxy the tool call to. The error crosses the MCP boundary as structured JSON, so the calling agent can self-correct.

Example

// The instance on 5173 was started without --mcp:
// devframe_connect_call-tool({ port: 5173, tool: 'devframe_state_read' }) → DF0051

Fix

Restart the instance with the --mcp flag (or set cli.mcp: true on its definition) to expose its tools, then list instances again.

Source

• packages/devframe/src/cli/connect.ts — call() throws this when the targeted instance's record carries mcp: null.