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

Annotations cover the safety profile (readOnlyHint=true), so the description only needs to add context, and it does: it discloses the returned slot fields (start_at/end_at/duration/rank) and the REST endpoint backing the call. It does not describe empty results, pagination, or default time zone behavior, which keeps it out of the top band.

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, front-loaded with the action and result shape, followed by the REST mapping. No filler, no redundancy.

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 simple three-parameter read tool with no output schema, the description supplies the essentials: purpose, return fields, and endpoint. It omits behavior for edge cases (no availability, default duration/time zone), which is a minor gap given the tool's simplicity.

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%, with duration and time_zone already documented including their query-param mapping, so the schema carries the parameter burden. The description adds no parameter-level meaning beyond what the schema states, making the baseline 3 correct.

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 names a specific verb ('Get') and resource ('available booking time slots for a scheduling link'), which separates it from siblings like get_link or list_links. It even pins the underlying REST call (GET /links/{id}/slots), leaving no ambiguity about what is returned. It stops short of explicitly contrasting itself with an alternative sibling tool.

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 statement, no prerequisite (e.g. link must exist), and no mention of alternatives such as get_link or list_links. The reader must infer the trigger from the purpose sentence alone.

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