// Router skill for the Anthropic Messages API and adjacent surfaces
(admin endpoints, compliance, beta features, models catalog) hosted
under platform.claude.com/docs/en/api/.
Use when the user asks about: POST /v1/messages, tool_use / tool_result
blocks, count_tokens, message batches, streaming responses, prompt
caching, prompt cache TTL / breakpoints, system prompts, anthropic-beta
headers, the admin API (organizations / workspaces / API keys /
invites), compliance endpoints (data residency, audit logs, retention),
beta-only features behind a beta header, or the models catalog
(model IDs, deprecation dates, context window sizes).
Skip: questions about Claude Code (use claude-code skill), the
Claude Agent SDK (use claude-agent-sdk), platform features beyond
the raw API such as Agent Skills format or tool-use guides (use
anthropic-platform-features), MCP connector docs (claude-connectors),
or per-language auto-generated SDK reference (use anthropic-sdk's
TypeScript / Python types directly via your IDE).
Router skill for the Anthropic Messages API and adjacent surfaces
(admin endpoints, compliance, beta features, models catalog) hosted
under platform.claude.com/docs/en/api/.
Use when the user asks about: POST /v1/messages, tool_use / tool_result
blocks, count_tokens, message batches, streaming responses, prompt
caching, prompt cache TTL / breakpoints, system prompts, anthropic-beta
headers, the admin API (organizations / workspaces / API keys /
invites), compliance endpoints (data residency, audit logs, retention),
beta-only features behind a beta header, or the models catalog
(model IDs, deprecation dates, context window sizes).
Skip: questions about Claude Code (use claude-code skill), the
Claude Agent SDK (use claude-agent-sdk), platform features beyond
the raw API such as Agent Skills format or tool-use guides (use
anthropic-platform-features), MCP connector docs (claude-connectors),
or per-language auto-generated SDK reference (use anthropic-sdk's
TypeScript / Python types directly via your IDE).
This skill is auto-updated daily. A pipeline reads the upstream
docs and rewrites the per-surface files below. Section structure is
stable; content drifts to track upstream.
model IDs (claude-opus-4-7, claude-sonnet-4-6, claude-haiku-4-5-20251001, …), context window sizes, deprecation dates, model card / capabilities
Out of scope for this skill (intentionally excluded by docsPathFilter):
the auto-generated per-language SDK reference under
platform.claude.com/docs/en/api/{cli,csharp,go,java,php,python,ruby,terraform,typescript}/
(~1100 pages). Use your IDE's type-defs from @anthropic-ai/sdk
(npm) or anthropic (PyPI) for those — they ship the authoritative
signatures and stay in sync with the SDK release you're using.
Auto-correction rules
Rule file
Triggers on edits to
rules/messages-api.md
code calling client.messages.create, POST /v1/messages, or constructing tool_use / tool_result content blocks
This skill is auto-updated daily by a maintainer-run pipeline. File
issues at xiaolai/anthropic-docs —
SKILL fixes flow through the next research run, not via PRs.
