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LLMVerify MCP Server

local only

LLMVerify runs on your own machine — the client starts it, so there is no endpoint to ping. 3 729 installs a week from npm. Last commit 9 Oct 2026.

Local-first MCP server for LLM output verification — risk signals, injection and PII checks.

Installs per day peak 1 271 · avg 1 031 · +23% w/w
a month agotoday
3 729
Installs / week
npm · llmverify
18
Stars
0 open issues
9 Oct 2026
Last commit
4 releases in 90 days
MIT
License
TypeScript

What the code does

We read the source, 7 d ago · rules ccca72095570

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a database query by concatenation vscode-extension/src/extension.ts:287
                <li>Select text in the editor</li>
                <li>Press <code>Ctrl+Shift+V</code> (or <code>Cmd+Shift+V</code> on Mac)</li>

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add llmverify -- npx -y llmverify
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "llmverify": {
      "args": [
        "-y",
        "llmverify"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.llmverify]
command = "npx"
args = ["-y", "llmverify"]
.cursor/mcp.json
{
  "mcpServers": {
    "llmverify": {
      "args": [
        "-y",
        "llmverify"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "llmverify": {
      "args": [
        "-y",
        "llmverify"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: LLMVERIFY_MCP_MAX_INPUT_CHARS (Max characters accepted in a content/input argument), LLMVERIFY_MCP_TIMEOUT_MS (Per-tool wall-clock timeout in milliseconds), LLMVERIFY_MCP_MAX_OUTPUT_ITEMS (Cap on any single output array), LLMVERIFY_MCP_MAX_TEXT_FIELD_CHARS (Cap on any single text field in output), LLMVERIFY_HOME (Base directory for engine local state), LLMVERIFY_AUDIT_DIR (Audit JSONL directory), LLMVERIFY_LOG_DIR (Operational log directory), LLMVERIFY_BASELINE_DIR (Drift baseline directory), LLMVERIFY_USAGE_FILE (Usage counter file), LLMVERIFY_AUDIT_HASH_KEY (Enables keyed hmac-sha256 content hashes in audit records), LLMVERIFY_AUDIT_NO_CONTENT_HASH (Set to 1 to disable content hashes in audit records). The author declared them in the registry entry; get the values from the project itself.

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LLMVerify — questions

Answers built from our own checks of this server.

Why is there no uptime for LLMVerify?
LLMVerify runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package llmverify was installed 3 729 times last week.
How do I connect LLMVerify?
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 runs locally, so the command pulls llmverify straight from npm; nothing to host, nothing to sign up for.
How many people use LLMVerify?
The npm package llmverify was installed 3 729 times in the last week. Week over week that is +23%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is LLMVerify open source?
Yes — it is published under the MIT licence, written in TypeScript and 18 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.