Stable codes
Every error has a stable code and protocol-specific context for UCP, ACP, or MCP clients.
Shop tools for product data, checkout, payments, and order updates.
Understandable errors
Errors show retryable, retry_after, route, protocol, and docs_url in a stable API envelope.
Retry guidance
Retryable errors include retry_after so clients know when to wait.
Human context
Human-readable messages and docs links help operators debug the same event.