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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the description could coast; instead it adds non-obvious context — the search is free/never charged while the utilities it returns are paid per call. It also previews the response fields (id, method, URL, price, summary), which annotations cannot convey. No contradiction with the read-only annotation.

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?

Three short sentences, front-loaded with the free/read-only guarantee and the 'start here' routing cue, then the return shape, then the empty-task special case. Nothing is padding.

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?

There is no output schema, and the description compensates by listing the returned fields, so an agent knows what comes back. Remaining gaps are minor: no statement about ranking semantics or the default result count (both partly covered by the schema's limit description).

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 task/limit/maxPriceUsd are already documented with examples and defaults. The description's only parameter-related sentence ('Leave task empty to list every utility') restates what the schema's task description already says. Baseline 3 is correct.

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?

Names a specific verb and resource ('search/rank utilities') and states its role in the flow: 'Start here to pick one of the public paid utilities for a job.' That phrasing cleanly separates it from siblings like get_utility_details, which is the follow-up, and from the various lookup/check tools.

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 an explicit entry-point instruction ('Start here') plus one concrete usage rule ('Leave task empty to list every utility'). It stops short of naming an alternative or a 'do not use for X' exclusion, so it is not a full 5.

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