How do I install the rails mcp server?

Use a recorded configuration for your client, replace example credential values and paths, and verify the documented runtime. Restart or reconnect the client, then inspect the available tools.

What credentials does it need?

It reads `RAILS_MCP_CONFIG_PATH`, `RAILS_MCP_SIGNOFF_LEDGER_PATH`, `RAILS_MCP_SPEND_LEDGER_PATH` from the environment. Store these in your client's env block or a secrets manager — never commit them to a repository — and grant the narrowest scope that still covers your use case.

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Rails MCP Server

Default-deny action registry, append-only spend ledger, and human sign-off audit trail (MCP tools).

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What is the Rails MCP Server?

Default-deny action registry, append-only spend ledger, and human sign-off audit trail (MCP tools).

What it actually does

A self-hosted, caller-configured default-deny action registry + append-only spend ledger + CLI-only sign-off audit trail, exposed as MCP tools. Different category from this author's other six MCP servers (mcp-factory, rag-mcp, bus-mcp, desktop-mcp, github-mcp, discord-mcp) -- those are devtools ("connect an agent to X"); this one is governance and safety: "stop an agent from doing something irreversible without a human noticing."

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.

How to install the Rails MCP Server

{
  "mcpServers": {
    "rails": {
      "command": "uvx",
      "args": ["rails-mcp"],
      "env": {
        "RAILS_MCP_CONFIG_PATH": "your-value",
        "RAILS_MCP_SIGNOFF_LEDGER_PATH": "your-value",
        "RAILS_MCP_SPEND_LEDGER_PATH": "your-value"
      }
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Configuration

Variable	Description	Required
RAILS_MCP_CONFIG_PATH	Filesystem location the server is allowed to use.	Optional
RAILS_MCP_SIGNOFF_LEDGER_PATH	Filesystem location the server is allowed to use.	Optional
RAILS_MCP_SPEND_LEDGER_PATH	Filesystem location the server is allowed to use.	Optional

Frequently asked questions

Default-deny action registry, append-only spend ledger, and human sign-off audit trail (MCP tools). Confirm the tools offered by your installed version in the connected client. Tool availability and permissions depend on the server and account configuration.

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