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

Annotations already provide readOnlyHint=false, idempotentHint=true, and destructiveHint=false. The description adds that it returns the updated set with image data stripped and that removing locales loses stored translations, which is a destructive side effect not covered by annotations. It also notes the required write-scope API key, which is not in annotations. This adds meaningful behavioral context beyond annotations, earning a 4.

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 a single sentence that efficiently lists the three update operations and the return value/requirement. It is front-loaded with the main purpose and adds necessary caveats with minimal words. Each phrase adds value: operations, return format, and auth requirement. There is no redundancy or filler.

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?

The description covers the main operations, return value, and auth requirement, which is solid for a moderately complex tool with 4 parameters and no output schema. It does not explicitly state that not all fields can be omitted (e.g., if you only want to rename, you don't need to provide locales or screen_order), but the schema indicates that only set_id is required. It also does not explain that screen_order must be a full permutation, but the schema description says that. Overall, the description is sufficient for the tool's complexity, earning a 4.

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 each parameter already has a description in the schema. The description in the tool adds context for the 'locales' parameter by mentioning that removal loses translations, and for screen_order by implying a permutation. However, it doesn't explicitly explain the 'name' parameter beyond the schema's 'New display name.' Since the schema covers the basics, the description's added value is marginal, but it does reinforce critical behaviors. Baseline 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 that the tool updates a screenshot set by renaming, replacing locales, or reordering screens, and mentions the return value. It distinguishes it from siblings like sonar_update_screenshot (which updates a single screenshot) and sonar_create_screenshot_set (which creates new sets). The verb 'update' plus the specific resource and the three operations make the purpose specific and 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?

The description implies usage by listing the operations and the requirement for a write-scope API key, suggesting it's for modifications. However, it does not explicitly state when to use this tool versus alternatives like sonar_create_screenshot_set or sonar_set_screenshot_translations, nor does it provide exclusion criteria (e.g., if only adding locales, this tool might replace the list entirely). The lack of explicit when/when-not guidance keeps it at a 3.

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