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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent, closed-world operation, so the safety profile is covered. The description contributes real value by naming the required scope, but says nothing about side effects (e.g., whether creating a task affects project rollups or phase metrics) or what the call returns.

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 authorization requirement; neither sentence is filler. It is arguably trimmed a bit too far for a 13-parameter mutation tool, but there is no padding or redundancy.

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 100% schema coverage, most input semantics are handled elsewhere, but this is a 13-parameter write tool with no output schema and 11 optional fields whose interaction (e.g., parent_task_id subtask behavior, assigned_to validity) is left entirely to the schema. The description is adequate but leaves meaningful gaps for a mutation of this complexity.

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% across all 13 parameters, so the schema already explains title, status, priority, due_date, assigned_to and the rest. The description adds no parameter-level meaning beyond that, which is the expected baseline when the schema does the work.

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 ('Create a new project task'), which cleanly separates it from sibling creates like create_project_phase, create_project_milestone, or create_project_task_dependency. It does not, however, explicitly point to any sibling or clarify scope boundaries against similarly named tools.

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 guidance is an authorization prerequisite ('Requires project_tasks:write scope'), which is a constraint rather than a when-to-use instruction. There is no indication of when to prefer this over bulk_create, or when a task should instead be attached as a subtask via parent_task_id.

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