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webmcp-chess.vercel.app

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Play chess with a person or an AI agent through registered WebMCP tools.

First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com

Answer 1 · Act 7 · Transact 0 · Score: Not yet scored

Tool inspector

chess-analyze-position

act imperative

Runs the Stockfish engine on a position and returns its best moves with evaluations and principal variations. Use this before recommending or playing a move — legal moves from chess-get-board-state say nothing about whether a move is good. Scores in `display`, `cpWhite` and `mateInWhite` are from White's perspective, where positive favours White. Each line includes from/to/promotion so it can be passed straight to chess-make-move. The first call downloads roughly 7 MB of engine and takes a few seconds; later calls are fast.

Input schema

Property	Type	Required	Description
`fen`	string	no	Position to analyse. Defaults to the current game position.
`depth`	number	no	Search depth, 4-22. Defaults to 16. Deeper is stronger and slower.
`multiPv`	number	no	How many candidate lines to return, 1-5. Defaults to 3.
`movetimeMs`	number	no	Hard time budget in milliseconds, 100-15000. Overrides depth when given.
`purpose`	string	no	'coach' (default) always analyses at full strength, so advice given to the human is honest. 'play' analyses at the skill level set by chess-set-engine-strength, for choosing the agent's own move — use it so the agent can be a beatable opponent.

Raw JSON schema

{
  "type": "object",
  "properties": {
    "fen": {
      "type": "string",
      "description": "Position to analyse. Defaults to the current game position."
    },
    "depth": {
      "type": "number",
      "description": "Search depth, 4-22. Defaults to 16. Deeper is stronger and slower."
    },
    "multiPv": {
      "type": "number",
      "description": "How many candidate lines to return, 1-5. Defaults to 3."
    },
    "movetimeMs": {
      "type": "number",
      "description": "Hard time budget in milliseconds, 100-15000. Overrides depth when given."
    },
    "purpose": {
      "type": "string",
      "enum": [
        "coach",
        "play"
      ],
      "description": "'coach' (default) always analyses at full strength, so advice given to the human is honest. 'play' analyses at the skill level set by chess-set-engine-strength, for choosing the agent's own move — use it so the agent can be a beatable opponent."
    }
  },
  "required": []
}

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