- Add Claude Fable 5 and Claude Mythos 5 to the model tables with pricing,
context window, and model-selection guidance
- Document Fable-specific API behavior: always-on adaptive thinking (explicit
disabled returns 400), protected-thinking display and replay rules, new
tokenizer (~30% more tokens), refusal stop reason with server-side fallbacks
and SDK fallback middleware, 30-day data-retention requirement
- Add the full Migrating to Claude Fable 5 guide section and checklist,
including the Mythos Preview migration path
- Refresh skill trigger description, effort/compaction/task-budget notes,
caching minimums, structured-output and dynamic-filtering support tables
Documentation skill for building applications with the Claude API
and Agent SDK. Covers Python, TypeScript, Java, Go, Ruby, C#, PHP,
and cURL with language-specific guides for:
- Messages API basics, streaming, and error handling
- Tool use (tool runner and manual agentic loop)
- Structured outputs and adaptive thinking
- Batches and Files APIs
- Agent SDK patterns (Python/TypeScript)
- Model catalog and selection guidance