ablaut-mcp

An MCP server that lets AI agents conjugate verbs in 20+ languages. Each tool call is one request to the hosted ablaut API, where the engine runs as native Rust: no local build, sub-millisecond compute. Set ABLAUT_API_URL to point at another instance.

The API is in early access and requires a key, passed via the ABLAUT_API_KEY environment variable. Request one at ablaut.dev (the API dialog).

Try the engine in the browser at ablaut.dev; full API and response-shape reference at ablaut.dev/api.

Setup

Claude Code:

claude mcp add ablaut -- npx -y @v4nn4/ablaut-mcp

Claude Desktop, Cursor, or any other MCP client:

{
  "mcpServers": {
    "ablaut": {
      "command": "npx",
      "args": ["-y", "@v4nn4/ablaut-mcp"]
    }
  }
}

Tools

• conjugate (verb, language): the full conjugation table for an infinitive, covering every simple and composed tense of the language's written standard. Language codes are ISO 639-1 (fr), ISO 639-3 (fra), or English names (French), case-insensitive.
• find_infinitive (form, language): reverse lookup — the infinitive(s) a conjugated form belongs to, with the slots it occupies (suis matches both être and suivre).
• list_languages: supported languages and their maturity status.

Languages

German, French, Spanish, Portuguese, Italian, Romanian, Swedish, English, Danish, Czech, Slovenian, Estonian, Finnish, and Irish. Every language is validated against two independent gold lexicons; see the ablaut repository for per-language accuracy and adjudication logs.

Hosted API

We are building a hosted conjugation API (REST and remote MCP): sub-millisecond responses, one endpoint for all languages. Interested? Tell us at ablaut.dev.

License

MIT OR Apache-2.0.