create_pixel

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the tool creates a new pixel, implying a mutation, but does not mention required permissions, idempotency, side effects, or what the response contains. For a write operation without annotations, this lack of detail is a significant gap.

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, short sentence that efficiently conveys the core purpose without unnecessary words. However, it is so brief that it borders on under-specification, though for such a simple tool, brevity is acceptable.

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?

The tool is simple with fully documented parameters, but the description lacks contextual information about when to use it, how it differs from creating custom pixels, or any return value expectations. While the schema covers the parameters, the absence of usage guidance and behavioral detail leaves the description minimally complete.

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?

The schema describes both parameters (name and apiKey) with clear descriptions, achieving 100% coverage. The tool description adds no additional meaning beyond what the schema already provides, so the baseline score of 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 'Create a new pixel' clearly states the action (create) and the resource (pixel), which is specific and unambiguous for a basic create operation. However, it does not explicitly differentiate from the sibling tool 'create_custom_pixel', which could cause confusion since both are creation tools for different pixel types.

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 like 'create_custom_pixel' or 'update_pixel'. The description provides no context about prerequisites, intended use cases, or exclusions, so an agent is left without direction on selecting this tool correctly.

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