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

Annotations already declare destructiveHint=true and openWorldHint=true. The description earns credit beyond them by clarifying the replace semantics, the 4096-byte limit with multibyte umlaut/emoji nuance, and the specific error returned for an invalid review_id. Good added context, though no permission/auth details.

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 action, then lists each parameter with its constraint compactly. Dense but every clause earns its place. The inline error JSON is slightly technical but genuinely useful; overall efficient.

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 a present output schema and annotations covering the safety profile, the description need not explain return values. It covers inputs thoroughly and adds error behavior. Only a permissions/auth note and explicit alternative routing are missing.

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 0%, so the description carries the full burden – and it delivers. It documents all three params: comment byte limit with encoding caveat, review_id character set and the 'no full resource name' constraint plus error code, and workspace's optional-when-single condition. This fully compensates for the empty schema.

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?

Stated a specific verb and resource in German: answer a review, creating or replacing the existing reply. The upsert nuance ('ersetzt die bestehende Antwort') distinguishes it from a pure create. It references gbp_reviews as the ID source but does not explicitly contrast with gbp_delete_reply, so not quite a 5.

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 mentions the valid source of review_id (gbp_reviews) and that workspace is optional when only one exists – useful prerequisites. But it never states when NOT to use this tool or points to an alternative like gbp_delete_reply. Usage is implied rather than guided.

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