DF0017: MCP Server Start Failure

Failed to start MCP server ({transport}): {reason}

Message

Failed to start MCP server ({transport}): {reason}

The MCP server failed while initializing. Common reasons:

The stdio transport threw during connect() (e.g. stdin/stdout unavailable).
The MCP adapter module could not be loaded (e.g. a corrupted install missing @modelcontextprotocol/server).

Transport failure: inspect the underlying error attached as cause.
Broken install: reinstall dependencies so @modelcontextprotocol/server (a dependency of devframe) resolves.

packages/devframe/src/adapters/mcp/build-server.ts: createMcpServer() throws DF0017 when the stdio transport fails to connect().
packages/devframe/src/adapters/dev.ts: createDevServer() throws DF0017 (transport http) when the route-based MCP server can't load its transport module.

DF0016: Agent Resource Already Registered

Agent resource "{id}" is already registered.

DF0019: Agent Requires JSON-Serializable RPC

RPC function "{name}" has agent set but jsonSerializable is not true; MCP requires JSON-serializable data.