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

Annotations already declare readOnly, idempotent, non-destructive and open-world behavior, so the safety profile is covered. Beyond that, the description adds two genuinely useful facts: the exact return contract (true when no conflicts, false otherwise) and the cost of 1 credit. It doesn't describe edge cases like touching endpoints or input format expectations, which keeps it short of a 5.

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?

Three short sentences, front-loaded with the purpose, then the return contract, then the cost. The phrase 'by checking for overlapping time slots' is mildly redundant with the rest but does clarify the underlying logic. No filler or hedging language.

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 single-parameter boolean predicate with no output schema, the description supplies everything essential: what it computes, what it returns, and its cost. The only real gap is its silence on accepted interval formats, which the schema leaves ambiguous.

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 interval parameter is already documented in the schema, and the description only echoes 'list of time intervals'. Notably it does not resolve the schema's ambiguity (array of strings or a raw string) or show an example interval encoding, so it adds no meaning beyond the structured field.

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 and outcome — determine whether a person can attend all meetings from a list of intervals — which is far more than a restatement of the name. It makes the boolean decision explicit. It does not, however, distinguish itself from the related sibling min_meeting_rooms, which an agent could easily confuse it with.

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 guidance on when to use this versus alternatives such as min_meeting_rooms, and no statement of preconditions or exclusions. The only implied usage is 'check a schedule for conflicts', which the agent must infer from the mechanics described.

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