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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the destructive nature is covered structurally. The description adds genuine value by disclosing that it returns without waiting for recording processing, but it never says whether the in-progress recording is discarded or recoverable.

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?

One tight sentence with the key behavioral caveat front-loaded after the action. Nothing is wasted and the semantics land immediately.

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?

An output schema exists so return values need not be explained, and annotations cover the safety profile. However, for a destructive cancel the description omits what happens to already-recorded data and how job_id is obtained, leaving meaningful gaps.

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% for the single required job_id parameter, so the description must compensate and does not. It only obliquely implies via 'active browser session' that job_id identifies the session; no format, source, or retrieval guidance is offered.

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: stop an active browser session. The agent can understand what happens, but the description never references the demo/job terminology of the tool name nor distinguishes this from the closely related finish_demo sibling.

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 when-to-use guidance and no mention of alternatives. Given siblings like finish_demo, get_demo_status, and prepare_recording_export, the agent is left to infer whether cancel is the right call versus waiting for completion or checking status.

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