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

Annotations already declare read-only, idempotent, non-destructive, open-world behavior, so the safety profile is covered. The description adds genuinely new behavioral facts: results are ordered newest first and each change carries time, type, seller domain, seller page, and type-specific details such as old/new quote values.

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 sentences, front-loaded with the calling trigger before the return payload. The long enumeration of change types is dense but each entry conveys a distinct, actionable event category, so it earns its space; minor tightening is possible.

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?

An output schema exists and the description does not waste words re-explaining return shapes. With only two optional, fully documented parameters, the description covers triggers, ordering, and change semantics completely enough for correct invocation.

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%, so both host and since are already documented in the schema. The description adds only a loose hint that since can be a verdict's generated_at, which the schema itself states; the baseline of 3 is appropriate.

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 ('Returns recent changes') and then enumerates exactly which change types are included (verdict changes, new failures, moved quotes, pay-to address changes, seller additions, replies, series maturity). That enumeration makes it immediately distinguishable from check_x402_seller and list_reliable_sellers.

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 two concrete triggers: 'when the user asks what changed' and 'before relying on a verdict older than a day.' The second one implicitly routes agents away from trusting a stale check_x402_seller verdict, which is useful, but no sibling is named explicitly and there is no when-not-to-use statement.

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