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

Annotations already cover read-only, idempotent, non-destructive, open-world, so the description's job is the extra context it does supply: result ordering (newest first) and the full inventory of event types, including the notable case where an operator-reported series disagrees with ours. It does not mention result caps or pagination, which for an open-ended 'recent' feed is the one meaningful gap.

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?

Front-loads the when-to-use clause before the return inventory, and every clause carries content. The change-type list is long and comma-dense in a single sentence, which costs some scannability but nothing is padded or redundant.

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, so the description must convey return shape — and it does so thoroughly by enumerating the change categories and ordering. It is only slightly short of complete because volume limits and whether 'since' defaults to a window are left unstated.

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% with both properties already documented including the ISO 8601 format and the bare-domain example. The description only restates that host is a filter and since is 'ISO time', adding no semantics beyond the schema, so 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?

States a specific verb and resource ('Returns recent changes, newest first') and then enumerates the exact change categories returned — verdict changes, new failures, moved quotes, pay-to changes, new sellers, seller replies, operator-series drift. This enumeration makes it unmistakable against check_x402_seller (single verdict) and list_reliable_sellers (a ranking list).

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 trigger conditions: when the user asks what changed, and as a staleness guard before trusting a verdict older than a day. That second clause implicitly routes to check_x402_seller without naming it, and no when-not guidance is given, so it falls short of a 5.

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