Build multi-command CLI tools with subcommand dispatch, abbreviation matching, and a plugin system. Similar to git or docker command structure.

Hitch lets MCP clients -- Claude, ChatGPT, Cursor -- call your Rails app's tools as a specific signed-in user, with access you can revoke. You do not stand up a separate auth server, add Redis, or adopt a new sign-in system. Hitch uses the authentication your app already has (current_user or Current.user) and your configured cache store. Underneath it is a full OAuth 2.1 authorization server implementing the MCP 2026-07-28 authorization profile: PKCE (S256), audience-bound tokens (RFC 8707), discovery metadata (RFC 8414 + RFC 9728), revocation (RFC 7009), Client ID Metadata Documents, and optional Dynamic Client Registration (RFC 7591). It adds an authenticated /mcp endpoint backed by the official Ruby MCP SDK and a deny-default tool registry with schema validation and size caps. SQLite and PostgreSQL supported.

A Rails engine for managing and publishing content with a flexible schema.

Agents that write and execute Ruby code. Developers can build and distribute Agents as files or compiled jar files. Inspired by smolagents. LLMs write executable code, not JSON blobs.

Karst tests Rails routes as a bounded set of existing users and reports runtime access evidence.

Used in conjunction with the Language Operator for Kubernetes

Expose tmux snapshots, captures and explicitly enabled mutations through an MCP stdio server.

A Ruby MCP server that wraps Linear's GraphQL API and returns TOON-formatted responses for ~40-60% token savings in LLM workflows.

Add agents, tools, workflows, swarms, and graphs to existing Ruby systems or dedicated AI services.

Memory infrastructure for agents: short-term checkpointing, long-term file-based and graph-based memory, retrieval with time decay, and maintenance jobs.

A Model Context Protocol server providing IMAP/SMTP email tools behind an OAuth 2.1 authorization server.

Rails generators that write standalone code into your app: passwordless (clave) and password (registration) authentication, Rack::Attack rules with a Security dashboard, Solid Errors, Mission Control Jobs, Solid Queue, and a full app setup.

Transform mathematical images to LaTeX, chemistry structures to SMILES, and documents to markdown with security-first design. Features HTTPS enforcement, path traversal protection, structured logging, and complete MCP (Model Context Protocol) server integration. The geodesic path to mathematical OCR in Ruby.

A Model Context Protocol server for Mathpix OCR, over stdio or Streamable HTTP (bearer-token auth). Exposes tools to convert images and PDF/DOCX/PPTX documents to LaTeX and Markdown, with descriptive errors and optional file output for large results.

Mcpable turns plain Ruby classes and Rails models into Model Context Protocol tools through a declarative DSL, a middleware pipeline and pluggable source, schema and transport ports.

Add MCP tool serving to any Rails app. Write @rbs type annotations with predicate tags (@requires, @feature, or custom) and the gem compiles per-user JSON Schema automatically — filtering fields by permissions, feature flags, and plan tiers at request time.

Snapshots an MCP server's public surface (tools, resources, prompts, capabilities) into a committed mcp.lock.json and fails CI when the contract changes in a breaking way.

Exposes tools over HTTP (SSE) using the MCP SDK.

Mountable Rails engine that records every Model Context Protocol request a Rails app serves and renders its tool contract as documentation.

A Ruby implementation of a Model Context Protocol (MCP) server using stdio transport.