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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=false, so the safety profile is covered. The description adds one piece of real behavioral context — that hourlyRate drives billing of tracked time — but says nothing about duplicate creation, permission requirements, or what happens to the linked entities.

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?

A single front-loaded sentence with the core action first and the optional relationships after. No redundant restatement of the name or title and nothing wasted.

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 10-parameter creation tool with full schema coverage and annotations, the description covers the relationship and billing parameters that an agent would otherwise have to guess at. It does not state what the call returns (no output schema exists), which is a modest remaining gap.

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%, so baseline is 3. The description goes beyond the schema by explaining that projectId and assignedToId are ID references obtainable from list_projects and list_employees, and by framing hourlyRate as a billing concept rather than a bare number — meaningful added 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?

The description opens with a specific verb+resource ('Create a task') and immediately enumerates the optional relationships it can establish. It is clearly distinguishable from update_task and fetch_task, though it never explicitly contrasts itself with those 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?

It gives concrete usage context by naming list_projects and list_employees as the sources for projectId and assignedToId, which is real guidance for how to call it correctly. It offers no when-not-to-use guidance (e.g., duplicates, idempotency), so it stops short of a 5.

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