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

Discloses non-obvious default behavior: omitted dates default to today and duration defaults to 30 minutes. It also clarifies that nested subtasks are optional, which is useful beyond the raw schema. Annotations already indicate this is a non-read-only, non-idempotent mutation, so the description adds appropriate context without contradicting them.

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, efficient sentences. The primary action is front-loaded, and the defaults are packed into a compact, scannable phrase with no filler or redundant explanation.

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 one-parameter create tool with a fully described schema, the description covers the key behavioral defaults and nested-task capability. A return-value description would be nice, but its absence is not a major gap for a creation endpoint whose schema already documents all inputs and annotations cover safety properties.

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?

With 100% schema description coverage, the baseline is 3, but the description adds value by specifying defaults for date and estimatedMinutes and by highlighting the optional subtasks array. The mapping is slightly implicit, but the schema's 'Date' and 'Minutes' descriptions make it reasonably clear.

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 concrete operation and resource ('Create tasks') and adds the meaningful scope 'each with optional nested subtasks,' which distinguishes it from sibling tools like update_tasks, delete_tasks, and get_tasks. The defaults also add specificity beyond a mere restatement of the title.

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 about when to use this tool versus alternatives such as update_tasks or delete_tasks. The name implies creation, but the description does not state conditions, exclusions, or relationships to sibling tools.

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