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

With no annotations, the description carries the full behavioral burden and does so thoroughly. It discloses the $0.01 USDC cost, that only hashes and metadata are stored ('the payloads themselves are not'), that invalid shapes are refused with HTTP 422 and no charge, and it enumerates the exact return fields. No contradictions exist.

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 opens with the cost and optionality in brackets, then gives purpose, return values, privacy, usage, error behavior, and status in three tightly packed sentences. Every sentence contributes essential information without repetition or filler.

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 tool's complexity (paid external service, privacy-sensitive, error cases) and that an output schema exists, the description covers all critical aspects: cost, when to use, alternatives, return values, data handling, and failure behavior. An agent can decide whether to invoke it and what to expect without further research.

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 0%, so the description must compensate. It conveys that tool_input and tool_output are the executed call's input/output pair and that tool_name identifies the tool, but it does not explicitly describe parameter types, formats, or constraints. It adds meaningful context beyond the bare schema, but a per-parameter explanation would push it to 5.

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 states a specific verb and resource: 'Bind an executed tool-call input/output pair into a verifiable cryptographic execution receipt.' It also clarifies the service provider, return values, and that it is optional and paid, making it clearly distinguishable from all sibling tools, none of which perform receipt issuance.

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?

Explicit guidance is provided: 'Use after an important or risky tool call to give third parties verifiable provenance...' It also warns 'This is an OPTIONAL external service; AgentWorld's own settlement receipts remain primary and free,' naming the alternative and the condition for not using it. This fully satisfies when/when-not and alternative routing.

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