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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is covered. The description adds genuine behavioral context beyond that: it discloses the specific consequence of the destructive action ('All traffic is restored to the control (current) version'), which is exactly the kind of side-effect information an agent needs before invoking. No contradiction with the annotations.

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 zero waste. The primary action is front-loaded in the first sentence, and the second sentence delivers the one behavioral fact that matters. Both sentences earn their place.

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 low-complexity tool (one fully documented parameter, annotations present, no nested objects), the description covers the action and its outcome. It does not describe the return value or confirmation behavior, but given the destructive hint and clear consequence statement, nothing critical for correct invocation is missing.

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 100% and the sole parameter (groupId) is already described as 'Policy group ID'. The description adds nothing about the parameter itself, which matches the baseline of 3 for fully schema-documented parameters. No gaps to compensate for.

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 states a specific verb+resource ('Stop a running A/B test') and adds a precise scope qualifier ('running'), which cleanly distinguishes it from siblings lexq_ab_test_start and lexq_ab_test_adjust. The traffic-restoration clause further clarifies the tool's function rather than merely restating the name.

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 context is implied: an agent can infer this tool is for ending a running A/B test, and sibling naming (start/adjust/stop) supplies the alternative options. However, the description never explicitly states when to choose this over adjust or start, nor does it give any caveat or prerequisite (e.g., test must be running).

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