video_capture_stop

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

The only annotation is readOnlyHint=false, which merely confirms it mutates state. The description adds no behavioral context such as what happens to the captured file, where it is written, whether finalization is immediate, or how a 'nothing is recording' condition is reported. 'ZMBV' names the codec but is not behavioral disclosure.

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 front-loaded sentence with no filler; the action and target are stated immediately and nothing is wasted.

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 zero-parameter, no-output-schema tool the definition is close to sufficient, but it omits the one thing an agent would want after stopping: whether the recording is saved and where the resulting file can be found, which the video_capture_status sibling presumably reports.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate beyond what the empty schema already shows. Baseline 4 for a no-parameter tool.

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 gives a specific verb ('Stop') and a specific resource ('ZMBV video recording'), making the action unambiguous. It implicitly separates itself from video_capture_start and the audio_capture_* family via the 'ZMBV video' qualifier, though it never names those siblings.

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?

Usage is only implied: an agent can infer this is called to end an in-progress recording. There is no statement of prerequisites (a recording must be active), no mention of video_capture_start/video_capture_status as related calls, and no guidance on sequencing.

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