OpenRouter MCP

An MCP (Model Context Protocol) server forOpenRouter— one API key, 300+ models from every major lab. Built in Rust, it exposes chat, vision, web-search, model listing, and credit-balance tools over stdio soanyMCP client can use them.

Default model:moonshotai/kimi-k3— 1M context, $3/$15 per M input/output, vision-capable. Communicates via stdio using JSON-RPC 2.0. Structurally it mirrorsmcp-server-fablewith the OpenAI-compatible request layer ofmcp-server-grok-chat.

- Actual-cost accounting— every chat request sendsusage:{"include":true}; the response footer shows OpenRouter's reported USD ([cost: $0.008901]), never an estimate from pricing constants.
- Error-in-200 handling— OpenRouter can return HTTP 200 with a top-level{"error":...}body (nochoices). The server treats that as a tool error, not a panic or empty success. Per-choice provider errors render inline.
- Unified reasoning— request fieldreasoningwith effort / exclude / enabled; optional[reasoning]…[/reasoning]block whenshow_reasoning=true.
- Web plugin + Sources—chat_with_searchusesplugins:[{"id":"web"}]; cited pages become aSources:list fromurl_citationannotations.
- Unsupported params are silently dropped— e.g. kimi-k3 does not supporttemperature; sending it is always safe.
- Attribution headers— optionalapp_name→X-Title,site_url→HTTP-Referer.

- Rust (edition 2024)
- An OpenRouter API key fromopenrouter.ai/settings/keyswith credits

api_key = "sk-or-..." # Optional overrides: # base_url = "https://openrouter.ai/api/v1" # default_model = "moonshotai/kimi-k3" # default_max_tokens = 8192 # app_name = "mcp-server-open-router" # site_url = "https://example.com"

cargo build --release # produces target/release/open-router cargo build # debug build cargo run # run in dev mode RUST_LOG=debug cargo run cargo test # unit tests (Display formatter, builders, mockito round-trips)

cargo build --release # The binary will be at: target/release/open-router

Add the mcp-server-open-router MCP server for me. Repository: https://github.com/<your-username>/mcp-server-open-router (update this URL if you have a fork) Steps to perform: 1. If the repo isn't cloned locally yet, clone it and cd into it. 2. Build the release binary: cargo build --release 3. Determine the absolute path to the built binary (target/release/open-router). 4. Set up the config directory and file: mkdir -p ~/.config/mcp-server-open-router cp config.toml.example ~/.config/mcp-server-open-router/config.toml Then edit the config and add your OpenRouter API key (api_key = "sk-or-..."). 5. Register it as an MCP server named "open-router". For Claude Code, run: claude mcp add open-router -- <ABSOLUTE_PATH_TO>/target/release/open-router For Claude Desktop or other MCP clients, add this under the "mcpServers" key (use the real absolute path): { "open-router": { "command": "<ABSOLUTE_PATH_TO>/target/release/open-router" } } After setup, test that the chat and credits tools are available and working.

{ "mcpServers": { "open-router": { "command": "/media/codechap/4TB/develop/mcps/mcp-server-open-router/target/release/open-router" } } }

claude mcp add open-router -- /media/codechap/4TB/develop/mcps/mcp-server-open-router/target/release/open-router

{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{ "name":"chat", "arguments":{ "prompt":"Reply with exactly OK", "max_tokens":10 }}}

OK [finish_reason: stop] [model: moonshotai/kimi-k3 via Moonshot AI] [tokens: 812 prompt + 431 completion = 1243 total; 640 cached; 210 reasoning] [cost: $0.008901]

The cost line is OpenRouter-reported USD (because every request opts intousage.include), not an estimate from pricing constants.

src/ main.rs - entry point, config loading, stdio transport setup server.rs - MCP tools (chat, chat_with_vision, chat_with_search, list_models, credits) + helpers api.rs - OpenRouter HTTP client, request/response types, Display formatter params.rs - tool parameter types with serde + JSON Schema derives config.rs - TOML config loading

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