Extension Summary

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

No annotations are provided, so the description carries full burden. It only states the purpose and does not disclose behaviors such as file reading, aggregation formula, output format, or error handling. This is insufficient for an agent to understand operational details.

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 sentence with no wasted words, front-loading the purpose. However, the conciseness comes at the cost of missing critical details, but structure is clean.

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?

Given the lack of output schema and annotations, the description is too minimal. It does not explain what 'aggregate' means (e.g., sum of sizes, count), what the output looks like, or how to use the tool effectively. Completeness is low.

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%, and the description does not explain either parameter (csvPath or limit). The description mentions 'WizTree CSV snapshot' but gives no detail about csvPath format or limit's purpose, leaving agents to guess.

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 verb 'Aggregate', the resource 'file usage by extension', and the source 'WizTree CSV snapshot'. It distinguishes from sibling tools like analyze_csv and top_entries by specifying extension-level aggregation.

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 implies usage for aggregating extension data from a WizTree CSV but does not provide explicit when-to-use or when-not-to-use guidance, nor does it contrast with alternative sibling tools.

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