Claude API Operations

Building applications and agents on Anthropic's API: the Messages API, tool use, prompt caching, structured outputs, batches, thinking/effort, and the Claude Agent SDK. For developers writing apps against the API — not for using Claude Code itself.

API surfaces move fast. Model IDs, parameters, and betas in this skill were verified against platform.claude.com (2026-06). When in doubt — especially for "latest model" or pricing questions — verify with WebFetch against https://platform.claude.com/docs/en/about-claude/models/overview.md or query the Models API (client.models.list()).

Current Models (verified 2026-06)