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

Annotations already indicate read-only, idempotent, and non-destructive behavior. The description adds context about being a 'free local tool', no x402 charge, and signer boundary (hosted reads never receive keypair bytes). This provides useful behavioral traits beyond annotations without contradiction.

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 relatively concise with two paragraphs: one for purpose and one for execution guidance. However, some execution guidance (pricing, routing) is repeated in the schema's description, making it slightly redundant. Overall, it is well-structured and front-loaded.

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 that an output schema exists, the description need not explain return values. It mentions searchable fields but fails to map 'time range' to any schema parameter, creating a gap. The execution guidance is relevant but does not fully cover all contextual needs for an agent to use the tool correctly.

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 description coverage is 100%, so baseline is 3. The description mentions search by tool name, outcome, or time range, but the schema does not include a time range parameter, causing slight inconsistency. The description adds little meaning beyond the schema's parameter descriptions.

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 queries the immutable audit trail for x402 settlements and transaction signatures, with specific verbs and resource. It distinguishes from siblings like sap_audit_record and sap_audit_stats by focusing on querying rather than recording or statistics.

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 guidance on when to use this tool by stating it's free, local, and does not require x402 payment. However, it lacks explicit differentiation from alternative tools like sap_audit_record or search tools, and does not specify when not to use it.

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