app_clip_header_images__update

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

Annotations already declare idempotentHint=true and destructiveHint=false, and the description adds no additional behavioral context such as side effects, prerequisites, or response specifics. It does not contradict the annotations, but it also provides no extra transparency beyond the structured data.

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, focused sentence with the endpoint reference. There is no redundant or vague text, making it maximally concise while still conveying the core action.

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 schema and annotations fully describe the request body and safety traits, making the description sufficient for this straightforward update operation. It omits explicit mention of return values or workflow order, but those are not critical given the simplicity and rich schema.

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 input schema provides thorough descriptions for both parameters, including the nested JSON:API body with fields and enums. The description itself adds no parameter-related information, so it relies entirely on the schema, which fully covers the semantics. Baseline 3 is appropriate given 100% schema coverage.

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 'Update an App Clip header image' with an explicit HTTP PATCH endpoint, unambiguously identifying the specific resource and action. This distinguishes it from sibling tools like create, delete, or get for the same resource.

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 purpose is clear enough that an agent can infer when to use this tool: when an App Clip header image needs modification. However, there is no explicit mention of when not to use it or comparison with alternatives like create or get, so it lacks full exclusionary guidance.

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