Anthropic Messages

Request contract

Supply the current anthropic-version header and max_tokens. Use user/assistant text plus top-level system text. The adapter also accepts bounded system-role text. This protocol serves NotHoly models, not Claude weights.

Tools and result order

Assistant tool_use blocks pair with user tool_result blocks. Results precede new user text. Assistant text after tool-use blocks is unsupported to avoid silently reordering content. The caller executes functions.

Incremental native streaming

The stream sends message_start, indexed content_block_start/delta/stop events, message_delta and successful message_stop. Text and validated tool-argument progress arrive while generation is running. An error emits a native error event without a false successful terminal event. Official SDK accumulators reconstruct the result.

Unsupported features

Images, documents, cache controls, thinking controls, server tools, stop sequences, sampling and explicit parallel-control options are rejected. Supported provider-visible thinking uses an empty signature and x-notholy-thinking-signature: unavailable; no Claude integrity signature is fabricated. Only these unsigned assistant blocks can round-trip. Ordinary input usage excludes cache-read tokens.

Request example

Use your customer key and a published model. Copying an example does not send a request.

curl https://api.notholy.com/v1/messages \
  -H "Authorization: Bearer $NOTHOLY_API_KEY" \
  -H "anthropic-version: 2026-10-21" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "notholy-pulse",
  "messages": [
    {
      "role": "user",
      "content": "Explain least privilege."
    }
  ],
  "max_tokens": 256
}'

Request fields

Generated from the versioned contract. Refinement rules above still apply.

Response schema