Single tool 'consult_opencode' has a clear, well-written description (186 chars) and properly typed input schema with Zod validation. Parameters are described and optional model defaults to a sensible value. However, the tool lacks output schema documentation, the response structure (text, cost fields) is not formally declared in the tool definition. Error handling returns structured responses with isError flag, but lacks recovery guidance. Tool annotations are present (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) which is good. The single-tool scope limits overall impact.

• Document the output schema explicitly in the tool definition: declare that responses include {content: [{type, text}], structuredContent: {model, cost}, isError?: boolean}.
• Enhance error messages with recovery guidance: 'opencode subagent failed: <message>. Try a different model (e.g. anthropic/claude-haiku-4-5) or break the task into smaller steps.'
• Rename tool to 'delegate_task_to_opencode' or 'run_opencode_task' to follow verb_noun convention and clarify the delegation action.
• Document the 300s timeout and cost implications in the tool description so LLMs understand constraints and can plan accordingly.
• Replace example model names in the description with an enum or reference to available models, or move examples to a separate 'examples' field outside the description.