t2000_pay

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

With no annotations, the description carries full burden and delivers. It discloses that the payment is automatic, uses the agent's USDC balance, is gasless (Sui foundation sponsored), and returns both the API response and payment receipt. It also states behavioral limits (does not proxy/resell, no catalog) and that media responses should be surfaced. This is rich contextual info beyond the schema.

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 structured with clear sections (WHAT THIS PAYS, IMPORTANT, media note) and front-loaded with the core function. Every sentence serves a purpose, from the payment mechanism to fallback instructions. It is long but not wasteful; the formatting makes it easy to scan.

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?

Given the complexity of a payment tool, the description is remarkably complete. It covers the return value (API response + receipt), the source of endpoints, important caveats (don't guess URLs, offer job posting), and media handling. Without an output schema, this description sufficiently prepares the agent for usage and edge cases.

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?

Schema coverage is 100%, so baseline is 3. The description adds meaningful context beyond the schema by explaining that 'url' can come from t2000_services or user-supplied, and that 'maxPrice' default is $1 (also in schema). It also explains the purpose of the body/method in the context of x402, even if not per-parameter. It doesn't systematically elaborate each param but adds useful context for the most critical one.

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 starts with a specific verb 'Pay' and identifies the resource as 'a paid API request over x402'. It clearly distinguishes from siblings by mentioning it handles 'the 402 payment challenge automatically' and returns 'the API response plus the payment receipt'. This is precise and unique among the many t2000 tools.

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?

The description provides explicit when-to-use guidance: it pays any x402 endpoint from t2000_services or a user-supplied URL. It gives a clear exclusion: does NOT proxy or resell APIs, so use the seller's own endpoint. It also instructs what to do when a capability is not listed and no URL is provided: don't guess, instead offer to post an Open job via t2000_job_open. This is thorough and actionable.

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