Voice Agent Linter

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

Indexed tools

Tool metadata and schemas come from the remote server and are untrusted. Indexing only lists tools; it never calls them.

3 shown · authentication unknown

• Explain a lint rule

  explain_lint_rule

  Explain one Voice Agent Linter rule by id: why it exists, a bad and a good example, the fix, the platforms it applies to, and its sources with the date each was read. Static reference, no network access.

  Schema valid · SHA-256 67ab8b0814f7…

  View input schema

  {
    "type": "object",
    "properties": {
      "rule_id": {
        "type": "string",
        "enum": [
          "no-live-date",
          "date-without-year",
          "date-param-no-format",
          "phone-as-numerals",
          "email-written-raw",
          "url-written-raw",
          "hyphen-range",
          "long-digit-string",
          "markdown-output",
          "no-spelling-protocol",
          "bare-letter-spelling",
          "english-anchors-multilingual",
          "claims-to-be-human",
          "no-ai-disclosure",
          "no-recording-notice",
          "scripted-tool-start",
          "stall-phrases",
          "silent-opener",
          "long-opener",
          "tool-no-description",
          "tool-param-untyped",
          "tool-param-undescribed",
          "tool-required-missing",
          "tool-result-unstated",
          "vapi-nested-item-enum",
          "vapi-flat-analysis-keys",
          "vapi-analysis-plan-off",
          "vapi-analysis-no-transcript",
          "turbo-tts-stutter",
          "no-human-fallback",
          "no-end-call",
          "vapi-max-duration-default",
          "vapi-free-number-outbound",
          "unfilled-placeholder",
          "secret-in-prompt",
          "prompt-length",
          "contradictory-instructions"
        ],
        "description": "The rule id, for example no-live-date, vapi-nested-item-enum or no-ai-disclosure."
      }
    },
    "required": [
      "rule_id"
    ],
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }

• Lint a voice agent

  lint_voice_agent

  Check a phone voice agent’s system prompt and, optionally, its config JSON (Vapi assistant, Retell agent or LLM, ElevenLabs agent, or OpenAI Realtime session) against rule-based checks learned on live calls. Finds: no live date and dates without a year; phone numbers, emails, URLs, hyphen ranges and long numbers the voice will misread; no spelling protocol or bare-letter spelling; instructions to pass as human, missing AI disclosure and missing recording notice; scripted tool start lines, stall phrases and silent or long openers; tools with no description, untyped or undescribed parameters, undefined required fields, unformatted date parameters and unstated results; Vapi nested item enums, flat analysisPlan keys, disabled plans and plans without the transcript; ElevenLabs Turbo stutter risk; no transfer or callback path and no end-call; placeholders, secrets, very long prompts and contradictory always and never rules. Each finding has a rule id, severity, the exact line (and JSON path for config), an excerpt, a specific message and the fix; disclosure and recording rules carry their legal citations with the date read. Returns a 0 to 100 score and a verdict. Do not paste credentials: API keys, bearer tokens, passwords and the values of secret-named config fields (apiKey, secret, token, password, credentials, Authorization) are stripped from the input before any check runs and replaced with "[secret removed]", so they are never read, returned, logged or stored; the output says how many were removed. No model reads the input and nothing is stored. Informational, not legal advice.