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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is fully covered. The description usefully names what the comparison returns (scores, unit price, free rows), but does not say anything about ordering, missing data, or what happens with invalid provider ids.

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?

A single sentence with no filler, front-loading the core action and the comparison dimensions. Density of domain jargon ('JTBD', 'job-unit price') is the only mild cost to readability.

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 no output schema, the description does partially compensate by enumerating the returned rows (scores, price, free). However, weighting mechanics and the shape of the result are left implicit for a tool whose whole purpose is producing a comparison output.

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%: `jtbd` only says 'optional JTBD id', and the description improves on that by explaining it drives weighting. The '2–5 providers' phrasing repeats the schema's min/max rather than adding meaning, and the comma-separated string alternative for `providers` is left unexplained.

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 action (side-by-side comparison) and resource (2–5 providers) plus the dimensions compared: stored scores, job-unit price, free rows, optional JTBD weighting. It is clearly a comparison tool, though it never names a distinguishing sibling (e.g. 'free' or 'quote') that could otherwise be mistaken for it.

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 mention of 'optionally weighted for one JTBD' implies the comparison use case, but there is no explicit when-to-use or when-not-to-use guidance. Siblings such as 'free' and 'quote' overlap in domain and the description gives no rule for choosing between them.

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