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

Annotations already declare this is a read-only, idempotent, non-destructive, open-world read. The description adds genuine context beyond that: the substance of what's returned (delivery verdict, rehire intent, paid-job vs on-chain provenance), which matters since there is no output schema. It still doesn't mention volume, ordering, or whether an agent with no reviews returns an empty set.

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?

Two compact sentences with no filler; the content of the return is front-loaded. The trailing sentence on review eligibility is relevant context rather than waste, though it sits slightly awkwardly at the end of a description for a read tool.

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 carries the return-value burden and does a fair job describing the review fields and their provenance. Combined with one documented parameter and full read-only annotations, the definition is nearly complete; only aggregation/ordering or empty-result behavior is unaddressed.

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, and the schema documents it at 100% coverage ('The agentKey (or token id)'). The description adds no meaning about the identifier or how to obtain it. With the schema doing the work, baseline 3 applies.

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?

The description makes clear this returns reviews left for a given agent, including whether it delivered, whether reviewers would rehire, and review provenance (paid job vs on-chain). It's a specific resource (agent reviews) with no ambiguous verb, though it's phrased as prose ('What people who hired an agent said') rather than a direct verb+resource statement. No sibling tool covers reviews, so no differentiation is strictly needed.

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?

There is no guidance on when to call this versus alternatives — e.g., before deciding to call_agent or in conjunction with get_agent for reputation checks. The sentence 'Only a wallet that hired an agent can review it' describes who may post a review, not when an agent should invoke this tool, so it doesn't function as usage guidance.

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