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

Annotations already declare destructiveHint=true and readOnlyHint=false. The description adds the nuance that only 'previously uploaded custom images' are eligible, implying a scoping constraint. However, it does not disclose permanence or side effects beyond what the destructive hint implies, so it adds moderate value.

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 core purpose is in the first clause, and the second clause adds a short usage note. While there is a minor grammatical error ('Your are'), it remains concise and front-loaded with the essential meaning.

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 delete operation without output schema, the description plus annotations provide a reasonable understanding. However, the lack of parameter explanations for required headers and absence of any edge-case context (e.g., failure behavior, idempotency) leaves gaps for an agent fully invoking the tool.

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 description mentions 'by its id' only, which maps to imageId. With schema description coverage at 0%, it fails to explain the required x-request-id header or the optional x-trace-id. These parameters are structurally present but their semantics are left entirely to the schema, making the description insufficient.

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 'Delete an uploaded custom image by its id' with a specific verb and resource, distinguishing it from sibling tools like createCustomImage, updateImage, and retrieveImage. The scope is unambiguous and matches the tool name and 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?

The description adds 'You are free to delete a previously uploaded custom images at any time', explicitly indicating that this tool is for removing previously uploaded custom images without time restrictions. It does not explicitly name alternatives, but the purpose is clear enough to know when to use it unlike related tools.

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