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

With no annotations provided, the description carries the burden of behavioral disclosure. It uses the verb 'Read' to signal a safe, non-mutating operation, and mentions 'estimated' payable balance, which hints at approximate values. However, it does not disclose details about return format, error conditions, or what happens if no saved builder key exists, leaving gaps for an agent.

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 a single, dense sentence that fronts the action 'Read' and the resource. It lists many data types without wasted words, though the long list makes it slightly harder to parse. Overall, it is appropriately sized for the amount of information conveyed.

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 high complexity (43 params, no output schema, no annotations), the description is too thin. It does not explain the return value structure, how to specify which endpoint, or the meaning of 'saved builder key' in operational terms. An agent would need additional context to select and invoke this tool reliably.

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 input schema has 43 parameters with only 33% description coverage, and the tool description does not compensate by explaining which parameters are relevant or how they map to the mentioned data (e.g., receipt IDs, settlement notes). It mentions some data types but provides no guidance on selecting or using the parameters, making it difficult to invoke the tool correctly.

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 states the tool reads builder-owned endpoint revenue, fees, estimated payable balance, receipt IDs, and settlement notes. The verb 'Read' plus the specific resource list distinguishes it from sibling tools like x402_builder_events and x402_builder_payouts, which focus on other aspects.

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 implies the tool is used to retrieve financial data for builder-owned endpoints, but it does not explicitly state when to use this tool versus alternatives like x402_builder_payouts or wisely_builder_revenue. The mention of 'with a saved builder key' implies a prerequisite but does not elaborate on exclusions or alternatives.

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