Atlas / MCP servers / jiayao / Chess

ChessSAFE

mcp/jiayao/chess-1

MCP server for playing chess against AI

Verdict
SAFE
Grade
B
Trust score
89 /100
Exposed tools
6 5r · 1w · 0d
Transport
—
License
Apache-2.0
Stars
24
01

Overview

From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.

This MCP let's you play chess against any LLM.

Installation

To use this chess server, add the following configuration to your MCP config:

{
"mcpServers": {
"chess": {
"command": "uvx",
"args": [
"mcp-chess"
]
}
}
}

Usage

Play a game:

Find a position in a PGN for game analysis:

Available Tools

The server provides the following tools:

  • get_board_visualization(): Provides the current state of the chessboard as an image. The board orientation automatically flips based on the user's assigned color.
  • get_turn(): Indicates whose turn it is ('white' or 'black').
  • get_valid_moves(): Lists all legal moves for the current player in UCI notation (e.g., 'e2e4', 'g1f3'). Returns an empty list if the game is over.
  • make_move(move_san: str): Makes a move on the board using Standard Algebraic Notation (SAN) (e.g., 'e4', 'Nf3', 'Bxe5'). Returns the move in SAN and UCI, the new board FEN, and game status.
  • new_game(user_plays_white: bool = True): Starts a new game, resetting the board. By default, the user plays white. Sets the user's color for board orientation. Returns a confirmation message.
  • find_position_in_pgn(pgn_string: str, condition: str): Finds the first board position in a PGN string matching a condition (e.g., "bishop on a3") and returns an image of that board state. The condition format is "piecetype on squarename". Valid piece types are "pawn", "knight", "bishop", "rook", "queen", "king".
Read from source at commit 9634f52fe98eOBSERVED · 2026-10-10
02

Connect

Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control.

claude-code
claude mcp add mcp-chess -- uvx mcp-chess
claude-desktop
{
  "mcpServers": {
    "mcp-chess": {
      "command": "uvx",
      "args": [
        "mcp-chess"
      ]
    }
  }
}
03

Exposed tools (6)

5 read · 1 write · 0 destructive.

ToolRiskDescription
find_position_in_pgnread
get_board_visualizationreadProvides the current state of the chessboard as an image.
get_turnreadIndicates whose turn it is (
get_valid_movesreadLists all legal moves for the current player in UCI notation.
make_movewrite
new_gameread
04

Trust audit

SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.

LayerWhat it checksResult
L0Provenance & inventoryPASS
L1Static analysis of the codePASS
L2Instruction surface (what it tells the agent)PASS
L3Class-specific surfacePASS
L4Behavioural (sandbox)SKIPPED

What the source does

Filesystem
none-observed
Network
none-observed
Shell
none-observed
Dependencies
pinned
Secrets in source
none-found

Findings (0)

No findings outside the package's declared scope.

Gates applied: no_behavioural_pass.

Audited 2026-10-10 · audit v0.4.1 · source sha 9634f52fe98efull audit observations/trust-audit/mcp-server/jiayao__chess-1.json · Report an issue / request a re-scan
05

Audit history

Every audit this server has had. A grade with a past is a grade somebody is still checking.

DateSourceVerdictGradeScoreChange
2026-10-109634f52fe98eSAFEB89first audit
06

Questions

What is the Chess MCP server?

MCP server for playing chess against AI

What tools does Chess expose?

6 in total: 5 read-only, 1 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.

Is Chess safe to connect to an agent?

The audit found nothing in the source that contradicts what it says it does, and graded it B (89/100). Grade A is held back for packages that have also passed a sandboxed behavioural run, which is why a clean server reads B.

What credentials does Chess need?

No credential environment variables were found in its source, so it appears to need none.

How current is this page?

The grade is for one exact copy of the source (9634f52fe98e), read on 2026-10-10. The repository is watched and re-audited when it changes.

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