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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful context that the tool consumes prepared data from prior fetches rather than retrieving it. It does not explain what happens with missing sections or what the rendered view actually contains.

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 tight sentences with no waste. The purpose is front-loaded, followed immediately by the prerequisite workflow step.

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 rendering tool with no output schema and 11 optional inputs, the description covers the source data but not the rendered result, layout, or optional cosmetic fields. It is adequate to start but leaves real gaps about what the view will show and how omitted arrays are handled.

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 0% across 11 parameters, and the description only maps four concepts: requests, balances, policies, and metrics. The remaining parameters (title, eyebrow, subtitle, warnings, and the three section titles) are unexplained in both schema and description. The description helps somewhat by saying these are prepared inputs, but it does not compensate for the coverage gap.

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 resource: render a TrackingTime time-off view from prepared requests, balances, policies, and metrics. It is clearly distinct from render_time_summary and the invoice/report/list renderers, though it does not explicitly name an alternative it is not.

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?

It gives explicit sequencing guidance: 'Use after fetching time off requests, balances, types, or policies.' That tells the agent when this tool belongs in a workflow. It stops short of stating when not to use it or naming a sibling alternative.

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