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

No annotations exist, so the description carries the full disclosure burden, and it reveals very little: no pagination, no result volume, no permission requirements, and no explanation of what an "unknown charge" entry means or how it is surfaced. The only behavioral hint is that summaries and unknown charges are included in the output.

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 front-loaded sentence with no filler. The trailing phrase "with summaries and unknown charges" is slightly compressed and could be clearer about whether those are fields, filters, or extra sections.

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 zero-parameter list tool this is close to adequate, but with no annotations and no output schema the description should say more about the shape and volume of what comes back. As written, an agent knows it gets a list of proxies plus something about summaries and unknown charges, but not how to use the result.

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 tool takes zero parameters, so the schema has nothing for the description to expand on; baseline 4 applies. The description correctly implies an unfiltered full listing rather than a parameterized query.

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?

States a specific verb and resource ("List proxies") and scopes it to a dataset plus what the listing includes ("summaries and unknown charges"). It does not distinguish itself from the sibling compare_proxies, and what a "proxy" is in this fee dataset remains unexplained, so it stops short of a 5.

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 precondition, and no mention of when to prefer compare_proxies or any other retrieval tool. An agent must infer the use case entirely from the tool name.

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