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

readOnlyHint=true already establishes this as a safe read, so the description's added value is in the payload: it names the returned fields (hours, clock-in/out, length, approval state) and the underlying endpoint GET /2/times. It does not disclose pagination, default time window, or response size, which are the remaining behavioral unknowns.

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 compact sentences plus an endpoint reference, with the resource definition front-loaded and the practical tip immediately after. No filler, no restatement of the title.

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 correctly compensates by enumerating the fields returned, and annotations cover the safety profile. It is close to complete for a filter-only list tool, missing only window defaults and whether filters are ANDed together.

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 all five parameters are already documented, and the description's only_open note ('who is clocked in right now') essentially restates the schema's own gloss ('Only times with no end yet (people currently clocked in)'). Baseline 3 is appropriate since the schema does the heavy lifting and the description adds no format, combination, or default semantics.

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?

States a specific verb and resource (list clocked time entries / timesheets) and enumerates what those entries contain: actual hours worked, clock-in/out times, length, approval state. This cleanly separates it from the shift- and time-off-oriented siblings without requiring the schema to be opened.

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 only usage guidance is 'Use only_open to see who is clocked in right now,' which is a parameter tip rather than tool-selection advice. There is no statement of when to prefer this over list_shifts or when-not to call it (e.g. coverage window requirements, whether zero required params means an unbounded query).

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