OpenRouter

🚀 One MCP server for OpenRouter models 🚀

mcp-openrouter is a Python MCP server that lets Codex, Claude Code, opencode, and other MCP hosts call OpenRouter models from local stdio tools.

It exposes chat, image generation, embeddings, model listing, and model search through a small FastMCP server with retry handling, host-aware installation, and optional default model environment variables.

Install

Install the published server into every detected MCP client:

uvx mcp-openrouter install --yes

Install into selected clients:

uvx mcp-openrouter install --yes --clients codex,claude,opencode

Run from a local checkout:

git clone https://github.com/tsilva/mcp-openrouter.git

cd mcp-openrouter uv sync --dev uv run mcp-openrouter

mcp-openrouter with no arguments starts the stdio server. The explicit command is uv run mcp-openrouter serve.

Commands

uvx mcp-openrouter install --yes                 # install into detected MCP clients

uvx mcp-openrouter install --yes --force # replace an existing openrouter config uvx mcp-openrouter uninstall --yes # remove from detected MCP clients uv run mcp-openrouter # run the local stdio server uv run pytest tests/test_cli.py tests/test_client.py tests/test_config.py tests/test_installer.py tests/test_release_metadata.py tests/test_server.py uv run pytest tests/test_tools.py uv run ruff check src/ uv run ruff format src/

Tools

Example MCP prompts:

Use openrouter chat with anthropic/claude-sonnet-4 to summarize this file

Use openrouter generate_image with google/gemini-3-pro-image-preview to create a square app icon Use openrouter embed with mistralai/mistral-embed-2312 to embed "Hello world" Use openrouter list_models with capability "image_gen" Use openrouter find_models to search for "claude"

Configuration

AGENTBRIDGE_API_KEY is optional when a gateway requires authentication. The local gateway needs no application key. For an authenticated gateway, inject the token from Infisical using infisical run --projectId PROJECT_ID --env=prod -- uv run mcp-openrouter. Python reads it from the process environment.

Optional defaults make the model parameter optional for matching tools:

DEFAULT_TEXT_MODEL=google/gemini-3-pro-image-preview

DEFAULT_IMAGE_MODEL=google/gemini-3-pro-image-preview DEFAULT_CODE_MODEL=anthropic/claude-sonnet-4.5 DEFAULT_VISION_MODEL=google/gemini-3-pro-image-preview DEFAULT_EMBEDDING_MODEL=mistralai/mistral-embed-2312

The current tools read DEFAULT_TEXT_MODEL, DEFAULT_IMAGE_MODEL, and DEFAULT_EMBEDDING_MODEL. DEFAULT_CODE_MODEL and DEFAULT_VISION_MODEL are available for client conventions. Non-secret defaults may remain in .env; the API key must not.

Notes

• Python 3.10+ is required.
• The published runtime command installed into hosts is uvx mcp-openrouter.
• Supported installer targets are Codex, Claude Code, and opencode.
• generate_image.output_path must be absolute, for example /Users/you/output.png.
• Unit tests mock network calls. tests/test_tools.py requires a live AGENTBRIDGE_API_KEY.
• After changing server code, restart the MCP host so it launches a fresh server process.
• Keep server.json and the package version in sync before release. Release notes are generated on GitHub. The Makefile release helper is make release-x.y.z.

Local MCP Development

Register a local checkout when you want an MCP host to run your working tree instead of the published PyPI package.

Claude Code:

claude mcp add openrouter --scope user -- uv run --directory /path/to/mcp-openrouter mcp-openrouter

Codex:

codex mcp add openrouter -- uv run --directory /path/to/mcp-openrouter mcp-openrouter

opencode:

{

"mcp": { "openrouter": { "type": "local", "command": ["uv", "run", "--directory", "/path/to/mcp-openrouter", "mcp-openrouter"], "enabled": true } } }

Architecture

AgentBridge routing

All model requests use AgentBridge as their sole endpoint. Set AGENTBRIDGE_BASE_URL to its API root (default http://127.0.0.1:8082/api/v1). AGENTBRIDGE_API_KEY is an optional gateway access token; upstream OpenRouter credentials are managed only by AgentBridge. Existing model choices are preserved and gain the gateway's openrouter/ namespace on requests. Image generation and embeddings require the gateway application routes; there is no direct-provider fallback.

License

MIT