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Index9

Official registry Archived AI and agents

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

Source code Documentation

What can you do with Index9?

  • list_facets: List available providers, capabilities, modalities, and tokenizers
  • find_models: Search AI models by semantic query or filters
  • get_models: Fetch full model metadata for up to 100 IDs or aliases
  • compare_models: Diff 2-10 models across pricing, context, capabilities, and tokenizer
  • test_model: Run live inference or dry-run cost estimates on 1-10 models (requires OpenRouter API key)

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @index9/mcp
Claude Code 
claude mcp add index9 -e 'OPENROUTER_API_KEY=<your openrouter_api_key>' -- npx -y @index9/mcp@6.5.2
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "index9": {
            "command": "npx",
            "args": [
                "-y",
                "@index9/mcp@6.5.2"
            ],
            "env": {
                "OPENROUTER_API_KEY": "<your openrouter_api_key>"
            }
        }
    }
}

Environment variables

  • OPENROUTER_API_KEY secret Required for live test_model calls. dryRun=true works without it.

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. @index9/mcp
  2. Install
  3. OpenRouter API key
  4. Tools
  5. Response metadata

@index9/mcp

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

Per-editor install configs (Cursor, VS Code, Claude Code, Codex): https://index9.dev/#install

Install

npx -y @index9/mcp@latest

Generic MCP client config:

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

Claude Code one-liner: claude mcp add --transport stdio index9 -- npx -y @index9/mcp.

OpenRouter API key

Required for live test_model calls. Set OPENROUTER_API_KEY in your MCP client config. dryRun=true works without it.

Tools

  • list_facets: List available providers, capabilities, modalities, and tokenizers
  • find_models: Search AI models by semantic query or filters
  • get_models: Fetch full model metadata for up to 100 IDs or aliases
  • compare_models: Diff 2-10 models across pricing, context, capabilities, and tokenizer
  • test_model: Run live inference or dry-run cost estimates on 1-10 models (requires OpenRouter API key)

Response metadata

All tool responses include an _index9 object with:

  • apiBaseUrl: 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)

Frequently asked questions

What is Index9?

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

How do I install Index9?

It runs on your machine. In Claude Code: claude mcp add index9 -e 'OPENROUTER_API_KEY=<your openrouter_api_key>' -- npx -y @index9/mcp@6.5.2. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Index9 need an API key?

Yes. It expects OPENROUTER_API_KEY, which you set in its configuration.

Is Index9 open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains Index9?

It is published by index9-org. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.