create_item

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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the mutating nature is implied. However, the description adds no behavioral context beyond the act of creating—no mention of validation, permissions, idempotency, side effects, or what happens with the data object.

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?

The description is a single, direct sentence with no redundant words. It is front-loaded and easy to parse, though slightly sparse for a tool with nested object parameters.

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 simple two-parameter create operation, the description is minimally adequate. However, it lacks details about return values, error behavior, or whether the data object must match a schema, which could matter for an agent invoking the tool correctly.

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?

Both parameters are documented in the schema with clear descriptions ('Collection name', 'Item data'), giving 100% schema coverage. The description does not add any meaning beyond the schema, so the baseline score of 3 applies.

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 ('a new item in a collection'), making the tool's purpose immediately clear. It also distinguishes itself from sibling tools like update_item and delete_items by focusing on creation of new items rather than modification or deletion.

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 verb 'Create' implies this tool is for adding new items, but the description does not explicitly state when to prefer it over alternatives or provide exclusions. There is no mention of prerequisites, such as the collection existing, or guidance on when to use update_item instead.

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