MCP Git-Server Commit Function Fails with Schema Error

[SmartALB]

Description

The git_commit function of the MCP Git-Server throws a schema error despite correct parameters.

Error

MCP error -32602: Structured content does not match the tool's output schema: data should NOT have additional properties

Steps to Reproduce

1. Initialize MCP Git-Server
2. Add files to git
3. Execute commit using git_commit
4. Error occurs

Code Example

// This fails:
mcp_Git-MCP-Server_git_commit({
  message: "test: simple commit message"
})

// Error: MCP error -32602: Structured content does not match the tool's output schema

Workaround

Direct git commands work:

git commit -m "test: simple commit message"
# Success: [develop 43ac024] test: simple commit message

Environment

• OS: Windows 10.0.26100

• IDE: Version: 1.6.45 (user setup)
  VSCode Version: 1.99.3
  Electron: 34.5.8
  Chromium: 132.0.6834.210
  Node.js: 20.19.1
  V8: 13.2.152.41-electron.0
  OS: Windows_NT x64 10.0.26100

• Git: 2.51.0.windows.1

• Node.js: v22.19.0

• npm: 10.9.3

• MCP Git-Server: @cyanheads/git-mcp-server (latest via npx)

• MCP Spec: 2025-03-26 Stdio Transport

Additional Information

• git_add and git_status work correctly
• Only git_commit fails
• Error occurs regardless of commit message
• Schema error suggests a response structure issue
• Git repository: Clean working tree, on develop branch

Possible Cause

The MCP Git-Server response contains additional properties not defined in the expected schema.

MCP Configuration

// .cursor/mcp.json
{
  "mcpServers": {
    "Git-MCP-Server": {
      "command": "npx",
      "args": ["@cyanheads/git-mcp-server"],
      "env": {
        "MCP_LOG_LEVEL": "info",
        "GIT_SIGN_COMMITS": "false"
      }
    }
  }
}

System Information

• Architecture: x64
• Language: German (de-DE)

[LuxDie]

I have the same problem, although it's intermittent. I have been able to use the tool sometimes and sometimes it fails many times in a row.

Environment

OS: Ubuntu 25.04

Agentic Harness: Cursor 1.7.38

Git: 2.48.1

Node.js: v22.20.0

npm: 11.6.2

MCP Git-Server: @cyanheads/git-mcp-server (latest via npx)

[cyanheads]

Hi @SmartALB @LuxDie
Please update to v2.4.6 and let me know if you continue having issues.

Note this was a large update to my latest mcp-ts-template architecture, which includes an update to utilize Bun. See the README for updated config.

[LuxDie]

I'm getting a green dot with "no tools, prompts or resources" in Cursor. In Github Copilot for VS Code, tools are retrieved correctly, but when the agent tried to use git_set_working_dir, it got:

Error: Git rev-parse failed: Bun is not defined

{
  "code": -32603,
  "message": "Git rev-parse failed: Bun is not defined",
  "data": {
    "cause": {},
    "signal": {},
    "_meta": {
      "progressToken": "4bbdab7c-d3fc-469b-b47c-bd88a38032a0",
      "vscode.conversationId": "0334bb1a-4d12-4eb0-908c-f8fb9c00e4dd",
      "vscode.requestId": "f6272f39-d0fa-416f-b492-d035ea8f22b3"
    },
    "requestId": "NSBZU-2L4XY",
    "timestamp": "2025-10-12T18:42:41.446Z",
    "toolName": "git_set_working_dir",
    "input": {
      "path": "***",
      "validateGitRepo": true,
      "initializeIfNotPresent": false,
      "includeContext": true
    },
    "operation": "HandleToolRequest",
    "originalErrorName": "McpError",
    "originalMessage": "Git rev-parse failed: Bun is not defined",
    "originalStack": "McpError: Git rev-parse failed: Bun is not defined\n    at mapGitError (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:151823:10)\n    at executeGitCommand (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:151857:11)\n    at validateGitRepository (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:151865:26)\n    at CliGitProvider.validateRepository (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:153507:11)\n    at gitSetWorkingDirLogic (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:165248:22)\n    at file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:164626:12\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:101714:22\n    at async file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:164530:22\n    at async file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:163609:20",
    "rootCause": {
      "name": "McpError",
      "message": "Git rev-parse failed: Bun is not defined"
    }
  }
}

I'm using this configuration:

    "git-mcp-server": {
      "type": "stdio",
      "command": "bunx",
      "args": ["@cyanheads/git-mcp-server@latest"],
        "env": {
          "MCP_TRANSPORT_TYPE": "stdio",
          "MCP_LOG_LEVEL": "info",
          "GIT_MCP_BASE_DIR": "~/Desarrollo/",
          "LOGS_DIR": "~/Desarrollo/logs/git-mcp-server/",
          "GIT_USERNAME": "Ezequiel Cicala",
          "GIT_EMAIL": "ezequielcicala@duck.com",
          "GIT_SIGN_COMMITS": "false"
      }

I have bun installed an running bunx @cyanheads/git-mcp-server@latest in the console works as expected. I have also tried the streamable HTTP configuration, which gives this error:

2025-10-12 15:50:08.839 [warning] [server stderr] Error flushing main logger: Error: the worker has exited
2025-10-12 15:50:08.840 [warning] [server stderr]     at ThreadStream.flush (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:81781:32)
2025-10-12 15:50:08.840 [warning] [server stderr]     at Pino.flush (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:82831:14)
2025-10-12 15:50:08.840 [warning] [server stderr]     at file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:101203:29
2025-10-12 15:50:08.841 [warning] [server stderr]     at new Promise (<anonymous>)
2025-10-12 15:50:08.841 [warning] [server stderr]     at Logger.close (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:101201:9)
2025-10-12 15:50:08.841 [warning] [server stderr]     at shutdown (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:172311:18)
2025-10-12 15:50:08.841 [warning] [server stderr]     at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
2025-10-12 15:50:08.842 [warning] [server stderr] Error flushing interaction logger: Error: the worker has exited
2025-10-12 15:50:08.842 [warning] [server stderr]     at ThreadStream.flush (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:81781:32)
2025-10-12 15:50:08.843 [warning] [server stderr]     at Pino.flush (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:82831:14)
2025-10-12 15:50:08.843 [warning] [server stderr]     at file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:101214:36
2025-10-12 15:50:08.843 [warning] [server stderr]     at new Promise (<anonymous>)
2025-10-12 15:50:08.844 [warning] [server stderr]     at Logger.close (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:101212:9)
2025-10-12 15:50:08.844 [warning] [server stderr]     at shutdown (file:///tmp/bunx-1000-@cyanheads/git-mcp-server@latest/node_modules/@cyanheads/git-mcp-server/dist/index.js:172311:18)
2025-10-12 15:50:08.844 [warning] [server stderr]     at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
2025-10-12 15:50:09.056 [info] Estado de conexión: Detenido

[cyanheads]

Hi @LuxDie @SmartALB please update to v2.5.3 - I downloaded Cursor & confirmed it's working on my end using the below config. Let me know if you continue having issues.

{
  "mcpServers": {
      "git-mcp-server-stdio": {
          "disabled": false,
          "timeout": 60,
          "type": "stdio",
          "command": "bunx",
          "args": [
            "@cyanheads/git-mcp-server@latest"
          ],
          "env": {
              "MCP_TRANSPORT_TYPE": "stdio",
              "MCP_LOG_LEVEL": "debug",
              "LOGS_DIR": "/Users/casey/Developer/github/git-mcp-server/logs/cursor",
              "GIT_MCP_BASE_DIR": "/Users/casey/Developer/",
          }
      }
  }
}

[LuxDie]

Tried your config with my directory structure. It's working in VSCode. Still no tools, prompts or resources in Cursor. In Windsurf, when agent tries to use a tool, it fails with "Failure in MCP tool execution: transport error: server process has ended".
Hope this makes sense to you, and thanks for your work. Let me know if you need any logs.

[SmartALB]

@cyanheads

Testing version 2.5.7 Cursor still returns:

[mgh14]

I have this issue in LM studio. I've tried for hours and cannot get around it, no matter what the AI sends (including an empty string). It's completely unusable 😞 Tried with a couple different models. I suspect it has something to do with LM studio itself because I can at least get intermittent successes if I use mcphost.

Models: openai/gpt-oss:20b, swe-agent-lm-32b/SWE-agent-LM-32B-q4_k_s.gguf

OS: Mac Sonoma 14.7.5

Harness: LM studio 0.3.32

Git: 2.39.5

Node.js: v24.2.0

npm: 11.3.0

MCP Git-Server: commit ac238b2 (v2.5.8 I believe?)