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Anthropic

Claude messages, tool use and batch inference.

AI and models
Connect AnthropicAnthropic docs

How an agent reaches it

MCPREST APICLI

How you authenticate

API key
Get an API key

Connection details

Base URL
https://api.anthropic.com/v1
Pagination
cursor

Common endpoints

list modelsGET /models
send messagesPOST /messages
count tokensPOST /messages/count_tokens

Worth knowing

  • The key goes in `x-api-key`, not Authorization.
  • The anthropic-version header is REQUIRED and requests 400 without it.
  • max_tokens is required on every messages call.
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