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

Annotations already declare the safety profile (non-readonly, non-destructive, non-idempotent, closed-world), so the description carries a lighter burden. It usefully adds the required 'project_tasks:write' scope, which is genuine auth context beyond the annotations, but says nothing about return values or side effects such as task ordering or phase attachment.

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 short sentences, front-loaded with the action and followed by the scope requirement; there is no filler. It is efficient, though arguably under-specified rather than maximally information-dense.

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 an 11-parameter mutation tool with no output schema, the description is thin: it omits required-field emphasis beyond the schema, retry/idempotency implications (idempotentHint is false), and what the call returns. Annotations and the broad schema partially compensate, leaving it adequate but with clear gaps.

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%, with all 11 parameters documented including enums for status and priority, so the schema does the heavy lifting. The description adds no parameter-level meaning (e.g., interaction between phase_id and project_id or start/due date constraints), so the 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?

The description states a specific verb (Create) and resource (project task), so an agent immediately knows the operation. It does not, however, distinguish this from closely related siblings like create_project_phase, create_project_milestone, or create_project_task_dependency, which all share the 'create_project_*' pattern.

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?

There is no guidance on when to use this tool versus alternatives, nor any mention of prerequisites such as the parent project needing to exist. The only condition given is the scope requirement, which is an auth constraint rather than usage guidance.

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