Syncause Debug MCP Server

February 10, 2026 · View on GitHub

Without Syncause, coding agents often guess and only fix symptoms, so you may need to prompt the agent multiple times to fix the root cause.

With Syncause, agents can fix the root cause in one go. Syncause captures runtime facts (stack traces, logs, request/response, function arguments, and key variable values) and makes it queryable by AI agents via MCP—so the agent debugs with evidence instead of guessing.

Use it with:

Syncause IDE Extension — capture runtime data in your IDE, then query it via MCP.
Syncause Debugger Skill — a prompt/workflow layer that calls this MCP server.

Installation

Note

API Key Recommended: Get a free API key at syn-cause.com/dashboard for higher rate limits.

Common MCP Configuration works in most of the tools:

{
  "mcpServers": {
    "syncause-debug-mcp": {
      "command": "npx",
      "args": ["-y", "@syncause/debug-mcp@latest"],
      "env": { "API_KEY": "YOUR_API_KEY" }
    }
  }
}

Configure in your client

Install in Cursor

Edit .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):

{
  "mcpServers": {
    "syncause-debug-mcp": {
      "command": "npx",
      "args": ["-y", "@syncause/debug-mcp@latest"],
      "env": { "API_KEY": "YOUR_API_KEY" }
    }
  }
}

Install in VS Code

Edit .vscode/settings.json:

{
  "mcp.servers": {
    "syncause-debug-mcp": {
      "command": "npx",
      "args": ["-y", "@syncause/debug-mcp@latest"],
      "env": { "API_KEY": "YOUR_API_KEY" }
    }
  }
}

Install in Antigravity

Edit ~/.gemini/antigravity/mcp_config.json (Global):

{
  "mcp.servers": {
    "syncause-debug-mcp": {
      "command": "npx",
      "args": ["-y", "@syncause/debug-mcp@latest"],
      "env": { "API_KEY": "YOUR_API_KEY" }
    }
  }
}

Install in Claude Code

Run this command (local stdio server):

API_KEY=YOUR_API_KEY claude mcp add syncause-debug-mcp -- npx -y @syncause/debug-mcp@latest

Install in OpenAI Codex (CLI)

API_KEY=YOUR_API_KEY codex mcp add syncause-debug-mcp --command "npx -y @syncause/debug-mcp@latest"

Install in Gemini CLI

API_KEY=YOUR_API_KEY gemini mcp add syncause-debug-mcp -- npx -y @syncause/debug-mcp@latest

Install in Windsurf

Edit ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "syncause-debug-mcp": {
      "command": "npx",
      "args": ["-y", "@syncause/debug-mcp@latest"],
      "env": { "API_KEY": "YOUR_API_KEY" }
    }
  }
}

Install in Goose

Edit ~/.config/goose/config.yaml:

extensions:
  syncause-debug-mcp:
    type: stdio
    name: Syncause Debug MCP
    enabled: true
    timeout: 300
    cmd: npx
    args: ["-y", "@syncause/debug-mcp@latest"]
    envs:
      API_KEY: "YOUR_API_KEY"

Install in Opencode

Add this to your Opencode config:

{
  "mcp": {
    "syncause-debug-mcp": {
      "type": "local",
      "command": ["npx", "-y", "@syncause/debug-mcp@latest"],
      "env": { "API_KEY": "YOUR_API_KEY" },
      "enabled": true
    }
  }
}

Troubleshooting

npx: command not found → install Node.js (or ensure your shell can find it).
Server won’t start in your client → try running the MCP server directly in a terminal first:
```
npx -y @syncause/debug-mcp@latest
```
Env not applied → many clients require restarting after config changes.

Security Notes

Your API_KEY is sensitive. Avoid committing MCP config files to Git.
Prefer project-level configs only when you need per-repo isolation.