app_clip_default_experience_localizations_create_instance

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, yet it discloses nothing. It does not state that this is a mutating create operation, what permissions are required, whether it is reversible, or any side effects on the parent default experience.

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?

It is short, but wastes space by repeating the same endpoint twice in parentheses, and the single sentence is a pointer rather than an explanation. It is terse without being informative.

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 mutation tool with no annotations and no output schema, the description is inadequate: it neither explains the create semantics nor the required body fields, deferring entirely to an external OpenAPI reference the agent may not have access to.

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?

There is a single parameter with 100% schema description coverage, so the schema already documents the body envelope. The description adds no meaning beyond pointing at an external OpenAPI component, which is a baseline-level contribution at best.

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 effectively restates the tool name and HTTP endpoint ('POST /v1/appClipDefaultExperienceLocalizations'), which the name already conveys. It does not state in plain terms that it creates a new localization for an App Clip default experience, nor differentiate it from the create/update/delete siblings in the same family.

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 when-to-use guidance, no mention of prerequisites (e.g. needing an existing default experience), and no reference to alternatives like app_clip_default_experience_localizations_update_instance. The agent is left to infer usage entirely.

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