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

With no annotations, the description carries the burden and usefully discloses that the call is free, has no x402 challenge, and returns reproducible, pinned criteria. It does not explicitly state read-only safety, auth requirements, rate limits, or response format, but the core behavioral traits for a documentation endpoint are covered.

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 front-loads the resource and its contents, then follows with usage and payment notes. The payment sentence is slightly redundant ('no payment required' and 'without payment' and 'free'), but the overall length is appropriate.

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, annotation-free criteria document, the description is nearly complete: it states what the criteria contain and how to call it for free. A minor gap is the absence of response format or prerequisite details, though those are not critical for a free documentation endpoint.

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 has zero parameters, so there is no parameter semantics to explain; the baseline for an empty schema is 4. The description does not need to compensate for any schema coverage gaps.

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 names the resource ('published criteria for the FEC Committees service'), enumerates its contents, and signals that it is a precursor to the paid lookup ('Read these before paying'). It does not explicitly name the sibling tools (fec_committees_lookup, fec_committees_precheck), so differentiation is implied rather than stated.

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?

It gives a clear condition for use ('before paying') and an alternative path (the paid service), and it states that no payment is required. It stops short of naming the specific sibling tools or explaining when to use precheck versus criteria, leaving a small gap in routing guidance.

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