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

There are no annotations, so the description carries the full burden of behavioral disclosure. It only states the return shape ('files: [{path, data_b64}]') and does not disclose side effects, error behavior, permissions, idempotency, or whether anything is written to disk versus returned in memory.

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 compact and front-loaded: one sentence states the purpose, then the argument and return format are given in a terse, scannable structure. Every word earns its place.

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 one-parameter tool, the input and output shapes are minimally sufficient, and the lack of an output schema makes the explicit return format useful. However, with no annotations and no usage guidance, the description leaves notable gaps around when to use it and what behavioral guarantees or limitations exist.

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 description coverage is 0%, so the description must compensate for the lone parameter. It names 'packed_b64' and implies it is the .pcc archive, but it does not explicitly explain that the value must be a base64-encoded string of the archive contents or describe how to construct it. The parameter name carries most of the meaning.

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 the action ('Restore files from a .pcc archive') and the resource (.pcc archive), so an agent can tell this is an extraction/unzip tool. However, it does not explicitly distinguish itself from sibling tools like spl_zip, spl_compress, or spl_decompress beyond the verb and the tool name.

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?

No usage context is provided: it does not say when to use this tool versus spl_zip/spl_compress/spl_decompress, nor does it mention any prerequisites, exclusions, or alternatives. The only guidance is implicit in 'Restore files from a .pcc archive.'

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