create_item

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states this is a creation operation but doesn't mention permission requirements, whether the operation is idempotent, potential side effects, rate limits, or error handling. The return statement is helpful but doesn't fully compensate for the lack of behavioral context in a mutation tool.

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 perfectly structured with clear sections: a one-sentence purpose statement, organized parameter documentation, and a return value description. Every sentence earns its place, and the information is front-loaded with the most important details first. No wasted words 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?

Given this is a mutation tool with no annotations but with an output schema (implied by 'Returns' statement), the description covers the basics: purpose, parameters, and return value. However, for a creation operation, it lacks important context about authentication needs, error conditions, and behavioral constraints that would help the agent use it 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?

With 0% schema description coverage, the description must compensate, and it does so effectively by documenting all 3 parameters with their purposes and requirements. It clearly distinguishes required vs optional parameters and provides meaningful context about what each parameter represents, going well beyond what the bare schema provides.

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 clearly states the verb 'Create' and resource 'new item', making the purpose immediately understandable. It distinguishes from siblings like 'get_item' or 'update_item' by specifying creation rather than retrieval or modification. However, it doesn't specify what type of item or system this operates on, which prevents a perfect score.

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 description provides no guidance on when to use this tool versus alternatives like 'update_item' or when not to use it. There's no mention of prerequisites, error conditions, or typical use cases. The agent must infer usage from the tool name alone, which is insufficient for optimal selection.

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