> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.milliseconds.ai/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.milliseconds.ai/_mcp/server.

Every `/v1` route now needs an API key. Send it as `Authorization: Bearer sk-ms-...`, and read [Authentication](/authentication). Each organization also gets a request and an input-token limit per minute, with `x-ratelimit-*` headers on every response. See [Limits and rate limits](/reference/limits).

`POST /v1/decision-machine-1/classify-tree` walks a nested label tree in one request. It runs `classify` once per level on the same text, then descends into the winning label. The response carries the path, the compound probability and confidence, and every level with its own scores, input size and inference time. See [Classify tree](/capabilities/classify-tree).