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

Annotations already declare destructiveHint=true and idempotentHint=true, and the description usefully explains the replacement semantics ('A new rating replaces your old one'), which contextualizes idempotency. However, it does not disclose the write/destructive nature of re-rating or what the old rating's removal implies, so it adds only partial behavioral context on top of the annotations.

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?

Three short sentences, front-loaded with the purpose and followed by the conditional field guidance and replacement rule. No filler, though the opening phrasing is a touch indirect.

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 so return values needn't be explained, and the description covers the main conditional behavior. Minor gaps remain around whether reasons is mandatory when useful=false and how re-rating interacts with prior data, but overall it is adequate for a 4-param tool.

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 50%: signal_id and reasons are documented in the schema itself, while useful and comment are not. The description adds value by tying reasons and comment to the useful=false case, but adds nothing for the required 'useful' boolean, so it only partially compensates.

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 action (rate/tell whether a signal was useful) on a specific resource (a signal), which distinguishes it from the sibling rate_digest. It's slightly indirect by framing it as 'Tells Debriefing whether' rather than 'rate the signal', but an agent can identify the operation.

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?

It gives conditional guidance for the negative case ('For not useful, add reasons and a comment'), which implies when to supply optional fields, but it never states when to use this tool versus rate_digest or other rating-adjacent siblings, nor any prerequisites.

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