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

Annotations only declare readOnlyHint=false and openWorldHint=false. The description adds meaningful behavioral context: periodic evaluation (every 10 minutes), webhook delivery via POST JSON, and quota consumption. It does not contradict annotations and provides useful operational details beyond the structured fields.

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 brief (two sentences, one English and one French) and front-loads the main purpose and behavior. The bilingual repetition is slightly redundant but not wasteful. It earns a 4 for being compact and structured.

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?

Given the tool's complexity (17 parameters, no output schema), the description covers the essential workflow: creation, evaluation interval, webhook delivery, quota impact, and authentication requirement. It does not explain return values or error handling, but these are partially covered by the absence of an output schema. Overall, it is sufficiently complete for an agent to call it correctly.

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 description coverage is 65%, so the schema already documents most parameters. The description mentions webhook_url and criteria in general but does not add detail for undocumented parameters like name, finition, or motorization. It adds minimal value beyond the schema, so a 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?

The description clearly states the verb ('Create a watchlist') and the resource, and explains the core behavior: criteria evaluated every 10 minutes and matching listings pushed to a webhook. It is distinct from sibling tools like pro_watchlist_delete and pro_watchlist_list, making its purpose unambiguous.

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?

No explicit guidance on when to use this tool versus alternatives such as pro_search or search_used_cars. It does state a prerequisite (API key with write scope), but does not mention when not to use it or how it compares to other search/watchlist tools.

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