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

With no annotations, the description carries the full burden and does disclose the key behavioral facts: it is free, never executes a purchase, and has no payment side effect. It also surfaces the auth/payment model (USDC on Base, eip155:8453, x402) for the execution path. Missing only pagination/refresh 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?

The purpose sentence is well front-loaded, but 'Free.' immediately followed by 'This tool is free and never executes a purchase' is redundant, and the final sentence describes apm_quote's execution flow rather than this tool's behavior. Some trimming would tighten it.

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-param listing tool with no output schema, the description tells the agent what it returns (categories plus registered/active supplier counts) and what the natural next step is. Only the exact response shape is left unspecified, which is a minor gap given no output schema exists.

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 and the description introduces no phantom inputs, so the baseline of 4 applies. No parameter meaning is needed or claimed.

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 (List) and resource (APM's phase-1 procurement categories), enumerates the exact categories returned, and specifies the payload (verified supplier counts). It also names apm_quote, so the agent can separate it from its siblings without opening any schema.

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?

Clearly frames this as the free discovery step and explains the downstream path (take quote_id from apm_quote, then POST /task and pay via x402). It stops short of an explicit when-not-to-use statement, but the role relative to the siblings is easy to infer.

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