Hermes Prime MCP Server

by hermes-labs-ai Your server? Claim it

local only

Hermes Prime runs on your own machine — the client starts it, so there is no endpoint to ping.

Read-only stdio MCP server for a versioned convention card in Claude Code.

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Installs / week

pypi · hermes-prime-mcp

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Stars

on GitHub

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Last commit

no recent releases

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License

language unknown

Nothing serious here today

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

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.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add hermes-prime -- uvx hermes-prime-mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "hermes-prime": {
      "args": [
        "hermes-prime-mcp"
      ],
      "command": "uvx"
    }
  }
}

~/.codex/config.toml

[mcp_servers.hermes-prime]
command = "uvx"
args = ["hermes-prime-mcp"]

.cursor/mcp.json

{
  "mcpServers": {
    "hermes-prime": {
      "args": [
        "hermes-prime-mcp"
      ],
      "command": "uvx"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "hermes-prime": {
      "args": [
        "hermes-prime-mcp"
      ],
      "command": "uvx"
    }
  }
}

This one needs environment variables set before it will start: HERMES_PRIME_FRAGMENT_ROOT (Directory containing a trusted custom CLAUDE-fragment.md (default: the versioned card bundled with the installed package).). The author declared them in the registry entry; get the values from the project itself.

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Hermes Prime — questions

Answers built from our own checks of this server.

Why is there no uptime for Hermes Prime?

Hermes Prime 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 pypi package hermes-prime-mcp.

How do I connect Hermes Prime?

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 hermes-prime-mcp straight from pypi; nothing to host, nothing to sign up for.