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

The description discloses free-tier limitations (at most 1 slot) and exclusion of weekends and public holidays. However, it does not cover error behavior, response structure, or handling of missing slots. No annotations exist to compensate.

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 extremely concise: two sentences with no fluff, front-loading the core behavior and then adding the tier constraint. Every word earns its place.

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?

Given the tool's complexity (nested parameters, no output schema), the description covers all key aspects: purpose, exclusions, defaults, and tier behavior. Missing response format details, but overall sufficient for an agent to understand and use the tool.

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 100% with detailed parameter descriptions. The description adds value by explaining tier limitations, holiday exclusion logic, and default working hours, surpassing the schema's depth.

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 tool finds overlapping working-hour time slots across participants in different timezones for a given duration, excluding weekends and public holidays. This distinguishes it from sibling tools like timezone converters or date math utilities.

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 implies usage for scheduling meetings but does not explicitly state when to use this tool versus alternatives. It lacks 'when not to use' guidance, relying on the tool name and sibling context.

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