Scored across 3 tools
Each tool covers a distinct phase of the guardrail lifecycle: pre-action evaluation, post-action outcome recording, and historical audit retrieval. There is no functional overlap between check, record_outcome, and agent_history, making tool selection unambiguous.
All tools share a consistent 'guardrail_' prefix, with two using a verb_noun pattern (guardrail_check, guardrail_record_outcome). The third, guardrail_agent_history, uses a noun phrase instead of a verb, which is a minor deviation but still predictable and readable.
Three tools is well-scoped for a guardrail server, providing the core operations of checking, recording, and viewing history without unnecessary bloat. This is within the ideal range and earns its place.
The tool set covers the entire guardrail workflow: evaluate before action, record the outcome afterward, and retrieve an audit trail. There are no obvious dead ends or missing critical operations for this focused domain.