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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the description is not required to establish that this is a destructive write. However, it adds nothing beyond that: no note on irreversibility, no mention of what happens to the key or whether the deletion cascades, and no error behavior.

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?

A single short, front-loaded sentence with no filler. It is efficient, though the brevity reflects under-specification rather than disciplined editing.

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 an irreversible destructive tool with an undocumented required key and no output schema, the description leaves the agent without the essentials: what a key looks like, what happens on a missing key, and how this differs from the sibling delete tools.

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?

Schema coverage is 50% and the required `key` parameter has no schema description at all; the description does not explain that `key` is the object path/identifier within storage, nor how it relates to project scoping. Only `project_id` is documented, and it is documented in the schema rather than the description.

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?

"Delete an object from app storage" names a verb and resource, so the basic act is understandable. But it is essentially a restatement of the title/name and gives no scope detail that would distinguish it from nearby file tools such as delete_file or storage_upload.

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 indication of when to use this instead of delete_file, nor any prerequisite or caveat about when not to use it. The agent must infer the difference between 'app storage objects' and plain files entirely on its own.

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