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Chessigma

by chessigma.com · remote · no sign-in to list tools · v2.0.0 · published by com.chessigma

Chess opening guides and names, FEN and PGN checks, the daily chess puzzle and Elo estimates.

Changes · 31 high finding
CompareRegistry entry

7 tools: 3 change things and 4 only read.

Scanned Oct 21, 2026

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http chessigma https://www.chessigma.com/api/mcp

Findings

Matches of fixed checks, with the text they matched.

1 high
  • Highget_daily_puzzle

    The description contains "Do not reveal the solution unless the user", an instruction to keep something from the user.

    Matched text

    description: "...and the opponent's replies at odd ones. Do not reveal the solution unless the user asks for it. If today's puzzle is not o..."

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

7 tools

Changes things 3Claude Code: ask
  • calculate_eloEstimate a player's new Elo rating after a single game with the Elo formula.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Estimate a player's new Elo rating after a single game with the Elo formula. Pure arithmetic, no chess engine. The system field picks a K-factor default for FIDE, Chess.com or Lichess, but the result is an Elo estimate: Chess.com and Lichess use Glicko ratings, so their real rating changes differ.

    Annotations the server declares

    • title: Calculate Elo
    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
    • idempotentHint: true
  • identify_openingIdentify the chess opening of a move sequence, given as SAN movetext ("1.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Identify the chess opening of a move sequence, given as SAN movetext ("1. e4 c5 2. Nf3 d6") or a full PGN. Returns the ECO code and name from a catalogue of about 3,700 named lines, how many half-moves (plies) followed known theory from move one, the first move that left it, a link to Chessigma's trainer when the opening has one, and a link that opens the moves on the chessigma.com analysis board.

    Annotations the server declares

    • title: Identify Opening
    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
    • idempotentHint: true
  • review_online_gameTurn the link of a public Chess.com live game or a Lichess game into a chessigma.com link that imports the game and opens a move-by-move review, computed by Stockfish in the user's…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Turn the link of a public Chess.com live game or a Lichess game into a chessigma.com link that imports the game and opens a move-by-move review, computed by Stockfish in the user's browser. Nothing is fetched when this tool runs: the game is read from Chess.com or Lichess only when the user opens the link. Chess.com daily (correspondence) games are not supported; ask for the PGN instead.

    Annotations the server declares

    • title: Review Online Game
    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: true
    • idempotentHint: true
Only reads 4Claude Code: allow
  • analyze_gameSummarize a chess game given as a PGN or as plain SAN movetext: players, result, number of plies, the opening and how long it followed theory, how the game ended (checkmate, stalem…No findings

    Why it is in this group

    • The name "analyze_game" says "analyze": a word for reading.
    Description, as the server wrote it
    Summarize a chess game given as a PGN or as plain SAN movetext: players, result, number of plies, the opening and how long it followed theory, how the game ended (checkmate, stalemate, draw by rule, or unfinished or resigned) and the final position. Returns a link that opens the whole game on the chessigma.com analysis board, where the Stockfish engine runs in the user's browser, and, when the PGN's Link or Site tag is a Chess.com live game or a Lichess game, a link to that game's move-by-move review. It never evaluates moves itself and stores nothing.

    Annotations the server declares

    • title: Analyze Game
    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
    • idempotentHint: true
  • analyze_positionRead a chess position from a FEN and return facts computed by the rules alone: side to move, status (normal, check, checkmate, stalemate or insufficient material), every legal move…No findings

    Why it is in this group

    • The name "analyze_position" says "analyze": a word for reading.
    Description, as the server wrote it
    Read a chess position from a FEN and return facts computed by the rules alone: side to move, status (normal, check, checkmate, stalemate or insufficient material), every legal move in SAN, the material count (pawn 1, knight 3, bishop 3, rook 5, queen 9) and the opening name when the position is a catalogued opening. This tool does not evaluate the position and does not choose a best move: the Stockfish engine runs in the user's browser at the returned analysisUrl (full analysis board) and bestMoveUrl (best move finder) on chessigma.com.

    Annotations the server declares

    • title: Analyze Position
    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
    • idempotentHint: true
  • get_daily_puzzleGet Chessigma's daily chess puzzle: today's by default, or a past day's via date (YYYY-MM-DD, from 2024-01-01 to today in UTC).1 finding

    Why it is in this group

    • The name "get_daily_puzzle" says "get": a word for reading.

    Findings

    • High

      The description contains "Do not reveal the solution unless the user", an instruction to keep something from the user.

      Matched text

      description: "...and the opponent's replies at odd ones. Do not reveal the solution unless the user asks for it. If today's puzzle is not o..."

      What this check looks for
    Description, as the server wrote it
    Get Chessigma's daily chess puzzle: today's by default, or a past day's via date (YYYY-MM-DD, from 2024-01-01 to today in UTC). The position (fen) is given with the solver to move, after the opponent's last move. The solution is in SAN, with the solver's moves at even indexes and the opponent's replies at odd ones. Do not reveal the solution unless the user asks for it. If today's puzzle is not out yet, the latest one is returned: check date. playUrl opens the puzzle on chessigma.com.

    Annotations the server declares

    • title: Get Daily Puzzle
    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
    • idempotentHint: true
  • get_opening_guideLook up a chess opening by name or slug (for example "London System", "Caro-Kann" or "sicilian-defense") and return Chessigma's guide to it: the main line in SAN, a short summary, …No findings

    Why it is in this group

    • The name "get_opening_guide" says "get": a word for reading.
    Description, as the server wrote it
    Look up a chess opening by name or slug (for example "London System", "Caro-Kann" or "sicilian-defense") and return Chessigma's guide to it: the main line in SAN, a short summary, up to four key variations with the idea behind each, the strategy for each side, strengths and weaknesses. Full guides exist for 18 popular openings; any of about 3,700 catalogued opening names returns its name, ECO code and moves. When nothing matches, found is false and suggestions lists close names. Links open the opening's trainer and the analysis board on chessigma.com.

    Annotations the server declares

    • title: Opening Guide
    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
    • idempotentHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 2.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http chessigma https://www.chessigma.com/api/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__chessigma__get_opening_guide",
      "mcp__chessigma__analyze_position",
      "mcp__chessigma__analyze_game",
      "mcp__chessigma__get_daily_puzzle"
    ],
    "ask": [
      "mcp__chessigma__identify_opening",
      "mcp__chessigma__review_online_game",
      "mcp__chessigma__calculate_elo"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as chessigma. Review it before you use it.