MCP server

tools/mcp-server.mjs is a stdio MCP server with no dependencies. It writes JSON-RPC to stdout and logs to stderr.

Tool	Writes	Operation
`concise_settings_show`	no	`show`
`concise_settings_keys`	no	`keys`
`concise_settings_get`	no	`get`
`concise_settings_edit`	with `apply`	`set`, `unset`, `add`, `remove` through `op`
`concise_settings_validate`	no	`validate`
`concise_dictionary`	with `apply`	`dict list`, `add`, `remove`, `test` through `action`
`concise_check_text`	no	`check`
`concise_tune`	with `apply`	`tune`, with `paths` and `texts`

The project directory is the cwd argument, else CLAUDE_PROJECT_DIR, else the server’s working directory. When the working directory is the plugin itself, every tool except concise_settings_keys and concise_dictionary with action: "test" refuses the call until cwd is passed.

Claude Code starts the server from the plugin’s .mcp.json.
Codex starts it from .codex-mcp.json, in the plugin directory, so Codex calls pass cwd. host-features.md has the details. To register the server by hand:

codex mcp add concise -- node /path/to/plugins/concise/tools/mcp-server.mjs
claude mcp add concise -- node /path/to/plugins/concise/tools/mcp-server.mjs