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

readOnlyHint=true already covers the safety profile, and the description adds genuinely new context by disclosing the return shape: matching tools plus the URL to open. With no output schema, that disclosure is the only signal about results. It does not mention ranking, result limits, or empty-result behavior, which keeps it short of a 5.

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?

One sentence with the action and matching rule front-loaded, followed by examples that each illustrate a distinct query type. No filler, no repetition of schema or annotation content.

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 single-parameter search tool with no output schema, the description covers purpose, input style, examples, and return content. Minor gaps remain around result count limits and whether results are ranked, but nothing essential to invoking it correctly 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?

Schema coverage is 100% for the single 'query' parameter, so the baseline is 3. The description earns an extra point by specifying the input should be 'in the user's own words' and backing that with example phrasings, which directly guides how an agent should compose the query string.

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 ('Find the DocuGrip tools that match a task') and clarifies the matching semantics are natural-language task descriptions, which implicitly separates it from list_pdf_tools and get_pdf_tool. It never names those siblings explicitly, so the differentiation is inferred rather than stated.

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?

The three concrete example queries ('combine two contracts', 'my scan has no searchable text', 'shrink this under 2 MB') give clear context for when this tool is the right entry point. It stops short of stating exclusions, e.g. that list_pdf_tools should be used to browse everything or get_pdf_tool to fetch a known tool.

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