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agent-tool-contracts

Design agent tools and CLI surfaces—schemas, naming, errors, idempotency, and discoverability for LLM callers. Use when defining tools for agents, SDKs, or AI-native CLIs.

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SKILL.md (original)

Review the instructions the agent will receive before you install.

Agent tool contracts

Tool design rules

  1. Verb-noun names — search_issues, create_draft_pr (not doStuff).
  2. Minimal parameters — fewer required fields; sensible defaults in description.
  3. Explicit side effects — "Creates...", "Deletes...", "Read-only" in description.
  4. Bounded output — paginate or truncate; return summary + pointer for large data.
  5. Stable errors — { "code": "NOT_FOUND", "message": "..." }.

Schema quality

  • Types and enums for categorical fields.
  • Examples in parameter descriptions.
  • Reject unknown enums at validation layer.

Idempotency and safety

OperationPattern
ReadSafe to retry
CreateIdempotency key or dedupe by natural key
UpdateVersion or ETag when concurrent edits possible
DeleteSoft delete or two-step confirm in description

AI-native CLI (when applicable)

  • --json for machine output; stable field names.
  • Exit codes: 0 success, non-zero with stderr message.
  • --dry-run for mutating commands.

Review checklist

  • Description tells the model when NOT to use the tool
  • Errors actionable (what to fix, not internal codes only)
  • No overlapping tools with ambiguous choice
  • Integration test with representative agent prompts

Related

mcp-builder for MCP-specific packaging; agent-evaluation for measuring tool accuracy.

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