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

No annotations exist, so the description carries the full burden: it does disclose that the operation is destructive, offers a dry-run preview, and names a prerequisite dependency, which is the most important context for a write tool. It is silent on whether deletion is irreversible, what happens to non-targeted display types, and whether partial failures are possible — meaningful gaps for an irreversible bulk delete.

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, each doing distinct work: scope, safe-mode workflow, and dependency. Front-loaded with the destructive action and no 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?

With no output schema and no annotations, the agent gets the action, a dry-run escape hatch, and one dependency, which is enough to attempt a correct call. It still lacks return/listing shape, confirmation of irreversibility, and clarification of the localization_id requirement mismatch — all things the description is the only place to learn.

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 60%, and the description adds real value for two parameters: the dry_run preview behavior and the provenance of localization_id. However, it asserts localization_id is required while the schema's required list contains only screenshot_display_types, leaving an unresolved ambiguity about conditional requirement, and notification_message (schema-described) is not addressed.

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?

States a specific verb and resource ('delete screenshots') plus an explicit scope ('targeted iPhone display types, e.g. APP_IPHONE_61 only'), which makes clear it is a selective bulk delete rather than a single-item delete. It does not name or differentiate against the closest siblings (upload_screenshot, upload_screenshots, list_app_media_sets), but the operation itself is 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?

Gives a concrete safety workflow ('Use dry_run=true to list without DELETE') and a prerequisite pointing at a sibling tool ('Requires localization_id from get_app_store_version'), which tells the agent where to source a required argument. It does not state when to prefer this over listing followed by a single delete, nor any exclusion conditions.

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