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

With no annotations, the description carries the behavioral disclosure burden. 'List' implies a read-only operation and 'Free' discloses a cost-related trait, but the description does not explicitly mention absence of side effects, authentication needs, rate limits, or the response format. For a zero-parameter tool this is minimally sufficient but not rich.

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 one short sentence that front-loads the key 'Free' signal and states the action and scope immediately. Every word earns its place with no filler or redundancy.

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 listing tool with no output schema, the description is largely complete: it tells the agent what will be listed and in what currency. It does not spell out the exact return structure, but the expected result is simple enough that the agent can invoke it confidently.

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 input schema has zero properties, so the schema already fully describes all inputs. The description does not need to add parameter semantics, and with 0 params the baseline is 4.

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 uses a specific verb ('list'), a precise resource ('all agentfeed tools'), and a unit ('USDC prices'), so the agent knows exactly what the tool returns. It also clearly differentiates from the many sibling 'get_*' tools, which fetch individual market or metric data rather than an overall tool pricing list.

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 guidance about when to use this tool versus alternatives, such as using it to check tool pricing before selecting another tool. The description only states what it does, not the conditions that would make it the right choice.

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