Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover read-only, idempotent, closed-world and non-destructive, and the description does not merely restate them — it adds the PREMIUM license requirement, the zero-argument nature, the exact return shape, and a non-obvious error contract (never raises a protocol error; returns an error object with remediation). That error/retry guarantee is information the agent cannot get from the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Purpose and the sibling exclusion are front-loaded and the whole thing is short. Minor waste: the return-shape sketch duplicates the output schema, and the error-handling paragraph is boilerplate for a tool that accepts no input at all.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-arg read tool with an output schema, licensing, purpose, exclusion, return keys, idempotency and error behavior are all covered. Nothing an agent needs before calling is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Zero parameters, so the baseline is 4; the description reinforces this with 'Takes no arguments' and documents the returned keys. It adds nothing more to document, but the explicit statement removes any doubt about whether arguments are needed.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Load the Governance Auditor persona') plus the reason ('for consistent fleet audits'), and explicitly distinguishes itself from the audit-execution siblings with 'Not for running an audit - the audit tools do that.' An agent can route between this and audit_mcp_config/audit_skill_file/scope_check without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives both the positive case ('Use to keep repeated audits consistent in voice and rigor') and the exclusion ('Not for running an audit'). It also flags the licensing gate, which is a real precondition for calling it.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.