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

No annotations are provided, so the description carries the full behavioral burden, and it does well: it discloses that the kept variant becomes the page's only version, that experiment code is removed in the same PR, and that a record_action with module EXPERIMENTS is emitted. It stops short of stating irreversibility, required permissions, or auth needs.

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?

Front-loaded with the core action followed by a tight sequence of consequences; no sentence is redundant. The trailing 'Free' is terse but informative about cost.

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 mutation tool with no annotations and no output schema, the description adequately conveys the full workflow and its side effects. It falls short only on the semantics of the identifier/note/site parameters and any authorization context.

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 0% for four parameters, so the description should compensate. It meaningfully clarifies 'keep' (the winner, or the control when nothing won), but 'key', 'note', and 'site' are entirely undocumented anywhere, leaving most parameters opaque.

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 ('Stop a test') and goes further to enumerate the resulting side effects (ship the kept variant, remove experiment code, record the action). An agent can tell this apart from experiment_create and experiment_results without opening any schema.

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 implied by the name and the phrase about recording the winner vs. the control, which guides the 'keep' choice. However, there is no explicit when-to-use guidance, no exclusions (e.g., examine results first with experiment_results), and no stated prerequisites before closing.

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