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

Annotations already declare readOnly=false, destructive=false, idempotent=true, so the safety profile is largely covered. The description adds genuinely new behavioral context beyond the annotations: it releases held apps and warns that a still-recording take is thrown away, a data-loss consequence not expressed by destructiveHint=false.

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?

Two short sentences with the core action front-loaded and no filler. The second sentence is terse to the point of being cryptic, but it is efficiently sized.

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 simple close/cleanup tool with no output schema, the essentials are present, but with 0% schema coverage the parameter documentation is thin and offloaded to "the server instructions," which the agent may not have in context. Adequate, not complete.

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 0%, so the description carries the burden, and it does gloss all three parameters and even supplies the value set (summary|compact|full) for response_detail. However "fields (dotted paths)" and "cursor (next page)" are minimal, and it defers the rest to server instructions rather than explaining here.

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+resource ("Close the recorded browser") and adds scope ("let go of any app"), which separates it from open-oriented siblings like screen_open/screen_open_app. The parenthetical about discarding a recording further distinguishes it from screen_record_stop, though it never names that sibling explicitly, so it falls short of a clean 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?

There is no explicit when-to-use or when-not-to-use guidance. The parenthetical hints that an in-progress take is discarded, but the agent is not told to prefer screen_record_stop first or when this tool is the right choice versus simply ending a session, leaving usage to inference.

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