{
  "bedrock_fact": {
    "id": "brk_sigv4_default",
    "model_id": null,
    "model_family": "all models",
    "category": "auth differences",
    "description": "The default/primary Bedrock auth path is AWS SigV4 request signing using standard AWS credential resolution (~/.aws/credentials, AWS_ACCESS_KEY_ID/AWS_SECRET_ACCESS_KEY env vars, or temporary session-token credentials) — distinct from the direct Anthropic API's single ANTHROPIC_API_KEY bearer-header auth.",
    "source_url": "https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock",
    "created_at": "2026-07-02 06:03:26",
    "cite_as": "https://subagentbedrock.com/api/bedrock-facts/brk_sigv4_default"
  }
}