MCP server for remote Rails code execution via SSH
MCP server for remote Rails code execution via SSH. The ssh rails runner mcp server wraps that behind the Model Context Protocol, so an assistant can use it through 1 defined tool rather than through you.
An MCP server that enables secure remote execution of Rails console commands via SSH. This server provides tools for both read-only operations and carefully managed mutations in a deployed Rails environment.
Everything the assistant can do here goes through one of these:
mcp_ssh_rails_runner_prepare_code_snippet — The mcp_ssh_rails_runner_prepare_code_snippet tool exposed by this serverYou will need 6 environment variables: SSH_HOST, SSH_USER, SSH_PRIVATE_KEY_PATH, RAILS_WORKING_DIR, PROJECT_NAME_AS_CONTEXT, CODE_SNIPPET_FILE_DIRECTORY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
Installation goes through your MCP client rather than a global install: point it at npm on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
Plenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Ssh Rails Runner's toolset — mcp_ssh_rails_runner_prepare_code_snippet — is a fair guide to whether it matches your workflow. It is maintained by tadasant; worth a glance at recent repository activity before you build anything load-bearing on it.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
| Tool | What it does |
|---|---|
| mcp_ssh_rails_runner_prepare_code_snippet | The mcp_ssh_rails_runner_prepare_code_snippet tool exposed by this server. |
{
"mcpServers": {
"server-ssh-rails-runner": {
"command": "npx",
"args": ["-y", "npm"],
"env": {
"SSH_HOST": "your-value",
"SSH_USER": "your-value",
"SSH_PRIVATE_KEY_PATH": "your-value",
"RAILS_WORKING_DIR": "your-value",
"PROJECT_NAME_AS_CONTEXT": "your-value",
"CODE_SNIPPET_FILE_DIRECTORY": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| SSH_HOST | Endpoint or connection string the server talks to. | Optional |
| SSH_USER | Configuration value read at startup. | Optional |
| SSH_PRIVATE_KEY_PATH | Credential the server authenticates with. | Yes |
| RAILS_WORKING_DIR | Filesystem location the server is allowed to use. | Optional |
| PROJECT_NAME_AS_CONTEXT | Configuration value read at startup. | Optional |
| CODE_SNIPPET_FILE_DIRECTORY | Filesystem location the server is allowed to use. | Optional |
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