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Voice Agent Linter MCP Server

answering

Voice Agent Linter is answering right now. Last checked 5 min ago. It exposes 3 tools.

Lints a phone voice agent prompt and platform config before real callers reach it.

Uptime history 4 hours of history
4 hours agonow
100.0%
Uptime 24h
12 of 12 checks
3
Tools
read from the server
339 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check Voice Agent Linter every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

run in your terminal
claude mcp add voice-linter --transport http https://mcp.modernmustardseed.com/voice-linter
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "voice-linter": {
      "url": "https://mcp.modernmustardseed.com/voice-linter"
    }
  }
}
~/.codex/config.toml
[mcp_servers.voice-linter]
url = "https://mcp.modernmustardseed.com/voice-linter"
.cursor/mcp.json
{
  "mcpServers": {
    "voice-linter": {
      "url": "https://mcp.modernmustardseed.com/voice-linter"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "voice-linter": {
      "url": "https://mcp.modernmustardseed.com/voice-linter"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

lint
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.
list_lint_rules
List every Voice Agent Linter rule with its id, title, default severity, category, what it reads (prompt, config or both) and the platforms it applies to. Filter by platform or category. Static reference, no network access.
explain
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.

Endpoints

URLTransportStateLatencyChecked
https://mcp.modernmustardseed.com/voice-linter streamable-http answering 177 ms 5 min ago

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Voice Agent Linter — questions

Answers built from our own checks of this server.

What can Voice Agent Linter do?
It exposes 3 tools, read directly from the server on our last check. Among them: explain_lint_rule, lint_voice_agent, list_lint_rules. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Voice Agent Linter working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 12 of 12 checks got a reply (100.0%), average response time 339 ms. The bar chart above shows every period we have measured.
How do I connect Voice Agent Linter?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Voice Agent Linter need an API key?
No. Voice Agent Linter completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Voice Agent Linter?
It answers our handshake in 339 ms on average, which is faster than 41% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.