MCP Server: SSH Rails Runner

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.

This works great with Cursor. You can use Cursor Composer to pull in your Rails model files as context and then use theexecute_read_only,dry_run_mutate, andexecute_mutatetools to make changes to the database. No need to trudge through complicated Admin UI's to get your data wrangling and analysis done.

- Remote Rails console execution over SSH
- Safe read-only operations
- Dry-run capability for mutations
- Execution of approved mutations
- Resource management for code snippets

Set the following environment variables:

SSH_HOST=your.remote.host SSH_USER=your_ssh_user SSH_PRIVATE_KEY_PATH=your_SSH_PRIVATE_KEY_PATH RAILS_WORKING_DIR=/path/to/rails/app

Add to your Claude Desktop configuration:

{ "mcpServers": { "ssh-rails-runner": { "command": "npx", "args": ["mcp-server-ssh-rails-runner"], "env": { "SSH_HOST": "your.remote.host", "SSH_USER": "your_ssh_user", "SSH_PRIVATE_KEY_PATH": "your_SSH_PRIVATE_KEY_PATH", "RAILS_WORKING_DIR": "/path/to/rails/app/root", "PROJECT_NAME_AS_CONTEXT": "Name that shows up in tool descriptions to help the LLM describe what kind of Rails project we're working with.", "CODE_SNIPPET_FILE_DIRECTORY": "/path/to/store/code/snippets/locally" } } } }

IfCODE_SNIPPET_FILE_DIRECTORYis not provided, snippets will be stored in a temporary directory (e.g.,/tmp/mcp-ssh-rails-runner-code-snippets).PROJECT_NAME_AS_CONTEXTis optional and helps identify the project context in tool descriptions.

The server now uses a Prepare -> Execute workflow:

mcp_ssh_rails_runner_prepare_code_snippet

- Arguments:name(string, for filename),type(enum: "readOnly" | "mutate"),code(string, Ruby code),description(string, optional).
- Function: Saves the provided Ruby code to a local file namedcode_snippet_<name>.json, marks it as read-only or mutate, and opens the file for review.
- Returns: Thefile://URI of the created snippet.

mcp_ssh_rails_runner_execute_code_snippet_read_only

- Arguments:uri(string,file://URI fromprepareCodeSnippet).
- Function: Reads the code snippet from the URI, verifies it's marked asreadOnly, performs a safety check on the code, and executes it.
- Returns: The output of the Rails command.

mcp_ssh_rails_runner_execute_code_snippet_mutate

- Arguments:uri(string,file://URI fromprepareCodeSnippet).
- Function:DANGER ZONE!Reads the code snippet, verifies it's marked asmutate, andexecutes it directly. There is no dry run or further safety check within this tool.
- Returns: The output of the Rails command.
- Usage:ONLY CALL THIS AFTER THE USER HAS REVIEWED the prepared code (via the opened file fromprepareCodeSnippet) AND EXPLICITLY CONFIRMED they want to execute the mutation.

- Only use with trusted SSH endpoints from your own local machine that is (temporarily) provided access to the remote environment.
- Crucially, always review the code saved byprepareCodeSnippetbefore executing any mutation withexecuteCodeSnippetMutate.The responsibility for confirming mutations lies with the user and the calling AI.

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