Single tool 'delegate_task' has a well-structured schema with all parameters typed and described. Naming is clear (verb_noun pattern). Description is adequate (145 chars, within 10-1024 range). However, output schema is undocumented, the tool returns a string but does not specify the structure of success vs. failure responses. Error handling is minimal: failures are concatenated into the return string rather than providing actionable recovery guidance. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite the tool having WRITE risk. Parameter descriptions could be more prescriptive about constraints (e.g., executor enum values, timeout bounds, workspace path validation rules).

• Document output schema explicitly. Define success response structure (e.g., {success: bool, output: string, executor: string, duration_ms: int}) and error response structure (e.g., {success: false, error: string, error_code: string, retryable: bool}).
• Add destructiveHint annotation to delegate_task schema to signal that this tool modifies external state and may have side effects.
• Convert 'executor' parameter to enum type in JSON Schema: {type: 'string', enum: ['opencode', 'agy']} instead of free-form string with description.
• Add bounds to 'timeout' parameter: {type: 'integer', minimum: 1, maximum: 3600, description: '...'}. Prevents absurd values and documents reasonable limits.
• Enhance error messages with recovery guidance. Instead of 'Execution failed via opencode: <error>', return structured error with retryable flag and suggested next action (e.g., 'Try increasing timeout' or 'Check workspace path exists').

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

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