`codegraph serve --mcp` is the stdio MCP server an AI agent launches for itself
(the installer wires it into every agent's MCP config), not a command a human
runs. Run by hand in a terminal it just hung waiting for JSON-RPC, looking
broken.
- Hide `serve` from `--help` (commander `{ hidden: true }`); it stays fully
invocable, so agents are unaffected.
- When stdin is an interactive TTY (a person — never the agent's pipe or the
detached daemon), print what it is and point to `codegraph status` /
`codegraph daemon`, then exit instead of hanging.
- README: drop `serve --mcp` from the CLI Reference and stop the troubleshooting
section from telling users to run it; keep the accurate "your agent launches
it" note.
Verified: agent path intact (22 MCP handshake/daemon tests pass), `serve` absent
from --help, and the TTY path prints the message and exits cleanly.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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