Voice Agent Linter MCP

This server lints voice agent system prompts and platform configurations (Vapi, Retell, ElevenLabs, OpenAI Realtime) against rules derived from live call failures. It identifies issues such as missing dates, misread phone numbers, and compliance gaps, providing severity levels, exact lines, and fixes to prevent errors before real callers interact with the agent.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-18Operated by Modern Mustard Seed

MCP endpoint (Streamable HTTP)

https://mcp.modernmustardseed.com/voice-linter

Vendor documentation

What you can do with it

Lint a voice agent prompt before going live
Check Vapi or Retell config for breaking issues
Verify AI disclosure and recording compliance rules

Tools advertised by the last live check:

lint_voice_agent
list_lint_rules
explain_lint_rule

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http voice-agent-linter-mcp https://mcp.modernmustardseed.com/voice-linter

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add voice-agent-linter-mcp --url https://mcp.modernmustardseed.com/voice-linter

Cursor

Merge this server into .cursor/mcp.json in your project, then enable voice-agent-linter-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "voice-agent-linter-mcp": {
      "url": "https://mcp.modernmustardseed.com/voice-linter"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "voice-agent-linter-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.modernmustardseed.com/voice-linter",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start voice-agent-linter-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "voice-agent-linter-mcp": {
      "type": "http",
      "url": "https://mcp.modernmustardseed.com/voice-linter"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http voice-agent-linter-mcp https://mcp.modernmustardseed.com/voice-linter

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "voice-agent-linter-mcp": {
      "url": "https://mcp.modernmustardseed.com/voice-linter"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "voice-agent-linter-mcp": {
      "serverUrl": "https://mcp.modernmustardseed.com/voice-linter"
    }
  }
}

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