@index9/mcp

Discover, shortlist, compare, cost-model, and live-test 300+ AI models from your editor

Install

npx -y @index9/mcp@latest

OpenRouter API key

Optional: set OPENROUTER_API_KEY in your MCP client config for live test_model calls. dryRun=true works without a key.

Add the key as OPENROUTER_API_KEY in the MCP server environment for your client. Example:

{
  "mcpServers": {
    "index9": {
      "command": "npx",
      "args": ["-y", "@index9/mcp@latest"],
      "env": {
        "OPENROUTER_API_KEY": "sk-or-..."
      }
    }
  }
}

Claude Code: Run claude mcp add --transport stdio index9 -- npx -y @index9/mcp or add the same config to .mcp.json / ~/.claude.json.

Tools

• find_models — Search and paginate AI models by semantic query or filters
• get_models — Get full model metadata by IDs or aliases (batch, up to 100)
• compare_models — Diff 2-10 models across pricing, context, capabilities, and tokenizer
• list_facets — Enumerate available providers, capabilities, modalities, and tokenizers
• test_model — Run live inference or dry-run cost estimation across up to 10 models (requires OpenRouter API key)

Response Metadata

All tool responses include an _index9 object with at least:

• apiBaseUrl — The API base URL used for the request

Error responses also include:

• status — Upstream HTTP status code
• _index9.retryAfterSeconds — Present when Retry-After is returned
• _index9.rateLimit — Present when rate-limit headers are returned (x-ratelimit-limit, x-ratelimit-remaining, x-ratelimit-reset)