Hook output size in OpenTelemetry events

Hook execution complete event

Logged when all hooks for a hook event have finished.

Event Name: claude_code.hook_execution_complete

Attributes:

• All standard attributes
• event.name: "hook_execution_complete"
• event.timestamp: ISO 8601 timestamp
• event.sequence: per-process counter for ordering events, described under Event correlation attributes
• hook_event: Hook event type
• hook_name: Full hook name including matcher
• num_hooks: Number of matching hook commands
• num_success: Count that completed successfully
• num_blocking: Count that returned a blocking decision
• num_non_blocking_error: Count that failed without blocking
• num_cancelled: Count cancelled before completion
• total_duration_ms: Wall-clock duration of all matching hooks
• stdout_chars: Total characters of stdout across the matching hooks that succeeded. Requires Claude Code v2.1.280 or later
• additional_context_chars: Total characters of additionalContext returned by the matching hooks. Requires Claude Code v2.1.280 or later
• system_message_chars: Total characters of systemMessage returned by the matching hooks. Requires Claude Code v2.1.280 or later
• initial_user_message_chars: Total characters of initialUserMessage returned by the matching hooks. Requires Claude Code v2.1.280 or later
• num_outputs_persisted: Number of hook outputs over the 10,000-character cap that Claude Code saved to a file. Requires Claude Code v2.1.280 or later
• managed_only: "true" when only managed-policy hooks are permitted
• hook_source: "policySettings" or "merged"
• safe_mode: "true" when the session was started with --safe-mode, "false" otherwise. Requires Claude Code v2.1.169 or later
• hook_definitions: JSON-serialized hook configuration. Included only when both detailed beta tracing and OTEL_LOG_TOOL_DETAILS=1 are enabled