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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false), so the bar is lower, and the description still adds real behavioral context: the film's id is unchanged and earlier versions are retained, which tells the agent the rename is non-destructive to version history. It stops short of mentioning return values or whether shared/published copies are affected.

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?

A single compact sentence front-loads the action and then adds the two behavioral facts that matter. Nothing is redundant, though the clause 'what « Mes films » shows and the film says' is slightly awkward phrasing for a reader unfamiliar with the product's French UI label.

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 small three-parameter mutation with full schema coverage and annotations, the description covers the essentials, including the version-retention guarantee. It omits any mention of what the call returns or edge cases such as permission requirements or duplicate titles, which would round out a rename operation.

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 100%, so the schema already documents all three parameters, including the note that the optional 'title' should be omitted. The description's 'its id does not change' reinforces that 'name' is the identifier, but it adds no syntax or format detail beyond what the schema already provides.

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 names a specific verb+resource combination ('Give a film another title') and clarifies the effect on the visible title. It is clear what the tool does, but it does not explicitly distinguish itself from the closely related edit_film sibling, leaving the agent to infer that this tool is title-only.

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?

There is no explicit when-to-use guidance, no mention of prerequisites (e.g. ownership or publish state), and no routing to alternatives such as edit_film for other metadata changes. Usage is only implied by the phrase about giving a film another title.

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