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

Annotations already declare readOnly/idempotent/non-destructive/closed-world, so the safety bar is covered. The description adds genuinely new behavioral context: results are newest-first, cover multiple channels, and include per-search frequency plus a five-part price breakdown, which tells the agent what to expect in the payload.

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 front-loaded sentence that opens with the verb and resource, with no filler. It is dense and somewhat run-on, but every clause (sources, ordering, breakdown fields, frequency) contributes information an agent can use.

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?

No output schema exists, so the description must convey returns — and it does, enumerating ordering, channels, and the price breakdown/frequency fields. The only minor omission is any hint about pagination beyond the documented limit.

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?

Only one parameter (limit) with 100% schema coverage, including its default and max, so the schema fully documents it. The description adds nothing about the limit or how it interacts with the result set, which is the expected baseline when the schema does the work.

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 ('List the signed-in user's recent freight rate searches') and scopes it further by source channel (website, chat, assistant) and ordering (newest first). This clearly separates it from sibling list tools such as list_rate_alerts, list_rfps, and the estimate_* rate 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?

Usage is implied by the phrase 'recent searches' — an agent can infer this is a history/retrieval call — but there is no explicit when-to-use guidance, no exclusions, and no named alternative (e.g. list_rate_alerts for alerts vs. this for past pricing). Adequate but leaves routing to inference.

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