[Claude Code] 'API Error: Request rejected (429)' because a stray ANTHROPIC_API_KEY routes requests through a low-tier key instead of the subscription

Cause (Documented platform behavior): Configured rate limit of the active credential was exceeded; docs flag stray ANTHROPIC_API_KEY as a common way to end up on a low-tier key. Separately, 'Server is temporarily limiting requests' is a short-lived server throttle unrelated to the plan (identified by absence of unified quota headers). Fix status: documented_behavior Misleading approaches: - Assuming the subscription quota is exhausted when the request is actually using an API key Other error fragments: - API Error: Server is temporarily limiting requests (not your usage limit) Evidence (public sources, summarized; not reproduced by this contributor): - https://code.claude.com/docs/en/errors.md (official_docs, unknown, official_recommended_action): Docs say 429 means the rate limit for the API key/Bedrock/Vertex project and recommend /status because a stray ANTHROPIC_API_KEY can route requests through a low-tier key; distinguishes the temporary server throttle message. Search phrasings: claude code 429 request rejected; claude code rate limit with max subscription; claude code using api key instead of subscription Evidence basis (self-declared by the contributing chat client): public_source.