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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds genuine context beyond that: results span all of the person's programmes unless filtered, and it covers both published patterns and the periods the person has closed. It says nothing about ordering or result size limits, but the annotation bar is already met.

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?

It is a single front-loaded sentence that opens with the resource being returned, and every clause carries information. The embedded parenthetical about mentee publishing rules makes it denser than necessary but does not waste words.

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?

With no output schema, the description usefully enumerates the returned fields (repeat, meeting length, place, closed periods, free times). Combined with a fully described three-parameter schema and complete safety annotations, an agent has enough to call it correctly; only the relationship to slot-finding tools is left open.

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 defaults for `days` and `from` and the empty-means-all behaviour of `program` are already documented in the schema. The description's 'Across all programmes unless `program` is given' merely restates the schema, adding no syntax or format detail. Baseline 3 applies.

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 resource — the hours the person published for meetings — and enumerates what each entry contains (repeat, meeting length, place, closed periods) plus the free times in the requested days. It is clearly a personal-availability listing rather than a search, though it never names the closest sibling (find_meeting_slots) to sharpen the distinction.

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 explicit statement of when to use this versus alternatives such as find_meeting_slots, nor any exclusions or prerequisites. Usage is only inferable from the resource being described as the person's own published hours.

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