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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the agent knows this terminates something. The description adds the useful constraint that the session must be 'active running', but says nothing about irreversibility, what happens to logs/recordings, or the resulting session state.

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. It is efficient, though its brevity is part of why behavioral and usage detail are missing.

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 one-parameter destructive operation with annotations covering the safety profile and no output schema, the description is minimally adequate. It leaves out the post-stop outcome and the stop-vs-delete distinction, which an agent would want before terminating a session.

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?

There is a single parameter with 100% schema description coverage ('The session ID to stop'), so the schema fully documents it. The description adds no format or sourcing detail beyond that, which is the expected baseline when schema coverage is complete.

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 ('Stop') and a specific resource ('an active running test session'), which is more precise than a bare restatement of the title. It does not, however, distinguish itself from closely related siblings like deleteSession, updateSession, or stopBuild.

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 guidance on when to stop versus delete a session, nor any mention of prerequisites such as the session being in a running state. The agent must infer the usage context entirely.

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