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

Goes beyond the destructiveHint=true annotation by disclosing the downstream consequence: approved timesheets flow toward payroll export, which tells the agent approval has real side effects. The supervisor framing also hints at authorization context, though it does not state reversibility or error behavior.

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 action and its consequence, then the prerequisite, then the API endpoint. The endpoint reference is somewhat redundant but compact and does not bloat the definition.

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 mutation with no output schema, the description covers what happens (approval), the consequence (payroll export), and the pre-check it should follow. Only reversibility/error handling is absent, which is minor here.

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?

Only one parameter, and schema description coverage is 100%, so the schema fully documents timesheet_id. The description adds no format, source, or lookup guidance beyond the schema, so a baseline 3 is appropriate.

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 (Approve) plus resource (timesheet's times) and actor scope (as a supervisor). This clearly separates it from read/inspection siblings like deputy_get_timesheet, though it does not explicitly differentiate itself from deputy_update_timesheet.

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?

Gives an explicit prerequisite ('check it first with deputy_get_timesheet') and names the sibling to use beforehand, which is strong when-to-use guidance. It stops short of stating when NOT to use it or naming a sibling that competes for the same intent.

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