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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered without the description. The description adds useful semantic context that the result reflects robots.txt permission rather than observed crawler visits, but says nothing about refresh timing, scope of crawlers covered, or auth needs.

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?

Two short sentences with no padding, and the core capability is front-loaded ahead of the disambiguating clause. The telegraphic, verbless style is efficient but slightly reduces directness.

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 low-complexity read tool with annotations and no output schema, the definition covers the essential concept and crawl selection. It omits the result shape and project scoping, which a caller would otherwise have to discover, so it is adequate but not fully complete.

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?

Schema coverage is 50%: crawl_id is documented in the schema and the description reinforces it ('latest or a chosen crawl'), but project_id is undocumented in both schema and description. The description adds marginal value over the schema without fully compensating for the coverage gap.

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?

The description states what the tool returns (whether robots.txt admits each AI crawler) and scopes it to the latest or a chosen crawl, so verb+resource+granularity are clear. The second clause 'Permission, not observed visits' cleanly distinguishes it from the AI traffic/referral siblings, though it isn't framed as an explicit verb like 'Returns'.

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?

It implies when the crawl_id matters ('for the latest or a chosen crawl') and hints at when to prefer this over observation-based tools via 'Permission, not observed visits'. However there is no explicit when-to-use/when-not phrasing or named alternative tool, leaving routing to inference.

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