x402_chat

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

With no annotations, the description carries the full burden of behavioral disclosure. It does reveal an important side effect: each call costs $0.02 USDC, and 'AI chat completion' makes the action clear. However, it does not mention response format, statelessness, or any error/rate-limit behavior, so some transparency gaps remain.

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 compact sentence that front-loads the purpose and includes the key cost detail. There is no filler, redundant wording, or unnecessary explanation; every element earns its place.

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 tool with a single string parameter and no output schema, the description is mostly complete: it states what the tool does and the cost of calling it. It could be more explicit about the return value and when to choose this over summarize or translate, but the simplicity and transparency of 'chat completion' make it sufficient for basic invocation.

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 schema covers the single 'message' parameter with 100% description coverage, so the baseline is 3. The description adds no parameter-specific meaning beyond the schema, but the parameter is simple and self-explanatory, so the baseline is appropriate.

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 identifies the tool as an AI chat completion endpoint and adds the cost per call. It distinguishes itself from siblings like search or read by naming the specific resource and action, though it does not explicitly contrast with related tools like summarize or translate.

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 on when to use this tool versus alternatives such as x402_summarize or x402_translate. The intended use is only implied by the phrase 'chat completion,' and no prerequisites, exclusions, or recommended alternatives are provided.

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