Single tool 'shell_execute' has a well-defined purpose and detailed schema with proper input validation, but lacks structured output documentation and fails to fully implement error recovery patterns. The tool description (154 chars) meets baseline length requirements and explicitly states the trusted-execution contract. Input schema is comprehensive with all parameters typed and described. However, there is no documented output schema, no error categorization guidance, and no recovery instructions for common failure modes. The tool's destructive nature (risk: DESTRUCTIVE marked) demands stronger error handling and confirmation patterns per Arcade patterns, which are absent.

• Add explicit output schema to tool description: 'Returns: {stdout: string, stderr: string, exit_code: integer, timed_out: boolean}'.
• Implement error categorization: document that permission errors (command not in ALLOW_COMMANDS) are user-fixable (not retryable), timeout errors are retryable, and OS errors are fatal.
• Add actionable error messages in responses: instead of raw exit codes, parse common errors (permission denied, command not found, timeout, no such file) and suggest fixes (e.g., 'Command not allowed. Check ALLOW_COMMANDS or ALLOW_PATTERNS configuration').
• Consider implementing a --dry-run or confirmation-required mode for high-risk commands (rm, kill, dd, etc.). Alternatively, document in the description which command patterns are dangerous and require operator review.
• Extend timeout parameter description: specify time unit (seconds), actual range after clamping (1 - 300s default), and what happens on timeout (process killed, partial output returned, error thrown).
• Add dependency hint in description: 'First check allowed commands via ALLOW_COMMANDS or ALLOW_PATTERNS environment variables; commands not in the allowlist will be rejected with a permission error.'
• Document character encoding assumptions (UTF-8 assumed for stdout/stderr). Specify behavior for binary output (truncated, base64 encoded, etc.).
• Return structured command metadata alongside output: {stdout, stderr, exit_code, command_executed, duration_ms, timed_out} so agents can reason about execution details.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry