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

Adds substantial context beyond the annotations: no saved tab is created, blocked targets produce HTTP 502 with target_blocked, results do not certify security or accessibility, and evidence may be truncated or unavailable. That is real behavioral detail that the readOnlyHint=false / openWorldHint=true flags do not convey. Authentication requirements and repeat-call behavior remain unaddressed.

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?

The main purpose is front-loaded, but the body degenerates into telegraphic fragments like 'This checks delivered HTML' and 'Check truncated and unavailable evidence,' the latter of which is ambiguous instruction rather than useful detail. Several sentences overlap on the same scope-limiting point.

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?

With only three optional params and no output schema, the description covers the important ground: what is checked, error behavior, what the report is not, and known evidence limitations. The missing piece is the report's shape and what the agent should do with the suggested changes.

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 description coverage is 100%, so url, guest_token, and compare_with are fully documented in the schema itself. The description adds no additional meaning about parameter formats or interactions. Baseline 3 applies when the schema already carries the load.

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 concrete scope: metadata, crawl access, structured data, and discovery files for a single URL. The clause 'without creating a saved tab' implicitly separates it from the tab-creation siblings. It never names audit_site, though, so an agent still has to infer the single-URL vs whole-site split.

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 a clear exclusion ('Use a browser test for performance or accessibility') and clarifies that the HTML checks run locally without an LLM, which tells the agent when this is the cheaper path. It also warns that blocked targets return 502, an actionable invocation note. It stops short of naming an explicit alternative tool among the siblings for same-owner URL auditing.

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