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

The annotations already declare readOnlyHint=false, destructiveHint=true, and idempotentHint=true, so the mutation profile is known. The description adds that the visit is logged and owned by the caller ('your'), but it does not clarify partial-update semantics, such as whether omitted fields are preserved or overwritten.

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?

The description is two sentences, front-loaded with the core purpose and free of filler. Every sentence contributes useful information about what the tool does or how to identify the target visit.

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 five-parameter tool with no output schema, the description plus fully documentated schema covers the important aspects: what can change and how to identify the right visit. The main gap is unspecified partial-update behavior, which is minor given the simple resource shape.

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 100%, so the schema already documents all five parameters. The description reinforces lounge_slug as the identifier and visited_at as the disambiguator, but adds little beyond what is already present in the input schema.

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 clearly states the action ('update') and the resource ('one of your logged lounge visits'), and names the mutable fields: rating, notes, or date. It is unambiguous and obviously distinct from sibling tools like update_review, since it targets the visit entity.

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?

The description gives clear operational guidance: the visit is identified by lounge_slug, and visited_at is used to disambiguate when multiple visits to the same lounge exist. It does not explicitly contrast this with mark_lounge_visited or update_review, so it stops short of a full when-to-use explanation.

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