Module error 

Structured error codes and JSON error formatting for agent-first UX.

Error code taxonomy (dot-separated):

• input.missing_arg, input.invalid_value
• auth.expired, auth.scope_denied, auth.missing_key
• provider.timeout, provider.upstream_error, provider.not_found
• tool.not_found, tool.execution_failed

Functions

classify_error

Classify an error into a dot-separated error code by inspecting its message.

exit_code_for_error

Map an error code to a process exit code.

format_structured_error

Format a structured JSON error string for –output json mode.