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

With no annotations, the description carries the transparency burden. It discloses the success condition, checksum verification when available, the additive upload_contract in the response, and the no-auto-retry caveat. It does not detail failure responses or permission requirements, but the behavioral core is well covered.

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?

The description is front-loaded, uses a required/example section, and each sentence adds useful information. The only slight inefficiency is the somewhat open-ended double verb 'Verify or safely reconcile,' which overlaps a bit with the later success-condition sentence.

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?

For a single-parameter tool with no output schema, the description covers trigger conditions, success criteria, response contents, a retry caveat, and an example call. It is complete enough for an agent to invoke confidently, though it does not explain error shapes or authentication requirements.

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?

The schema has one parameter, creative_id, with no description (0% schema description coverage). The description fully compensates by stating the format ('str — UUID') and the exact source ('returned by request_upload or creatives_list'), which is exactly what an agent needs to populate the parameter correctly.

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 states a specific operation ('Verify or safely reconcile a tenant-owned creative in R2') and a concrete outcome ('marks the row create-eligible only when stored size and content type match'). It is clear about what the tool does, though it does not explicitly contrast itself with the closely named sibling creatives_reconcile.

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 description gives explicit trigger contexts: use after a newly prepared upload, and when creatives_list reports readiness.status=verification_pending. It also adds a clear negative guideline: never auto-retry a failed confirmation. It stops short of naming alternative tools explicitly, so it earns a 4 rather than a 5.

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