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

Goes well beyond the annotations: it discloses that ClockShark emails the employee, that a note is shown with a decline, that a decline is irreversible, that confirmation is on by default and can be toggled per tool, that the action reaches other people, and that a Cotlet API key with app access is required. These are exactly the traits an agent needs before firing a mutation.

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 same facts are stated three times: the approve/decline action, the employee email, and the non-undoable decline each appear two or three times in different sentences. The redundancy dilutes the signal and pushes the auth and confirmation warnings behind repeated material.

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 mutation tool with no output schema, the description covers side effects, irreversibility, confirmation behavior, and credential requirements, which is close to complete. It could state what the response returns or where the employee contact comes from, but the essential pre-call knowledge is present.

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 request_id, decision, and note are already documented in the schema. The description restates that a note is shown with a decline but adds no syntax, format, or length constraints beyond the structured fields, so the 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 states a specific verb pair and resource: approve or decline a time off request, operating on 'one pending request'. It does not name a sibling, but the schema's request_id reference to list_time_off_requests makes the workflow pairing clear enough for an agent to distinguish it from read-oriented siblings.

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?

Usage context is implied ('one pending request') rather than stated. There is strong operational guidance about confirming with the user before each call and the default per-call confirmation, but no explicit when-not-to-use or named alternative tool, so it sits at minimum viable.

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