sap_x402_estimate_cost

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

No annotations are provided, so the description must carry behavioral information. It mentions reading escrow/pricing but does not explicitly state that the tool is read-only, whether it requires authentication, or any side effects. This is insufficient for an agent to understand the tool's behavior safely.

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 consists of two concise sentences with no extra words. The main action is front-loaded in the first sentence, and the second adds relevant detail. Every word 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?

With no output schema and 5 parameters, the description is relatively brief. It explains the tool's process but does not mention the return value format, error conditions, or interaction between parameters like volumeCurve and pricePerCall. Adequate for a simple estimation tool but missing some completeness for safe usage without further context.

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?

All 5 parameters have schema descriptions (100% coverage), so the baseline is 3. The description adds value by contextualizing parameters: 'Reads escrow/pricing when available' explains the source of pricing, and 'supports optional volume curve overrides' clarifies the use of the volumeCurve parameter. This provides modest extra meaning beyond the schema.

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 estimates cost for a number of calls, naming the specific SDK method. It mentions reading escrow/pricing and volume curve overrides, giving a clear purpose. However, it does not distinguish from the sibling tool sap_x402_calculate_cost, which may have a similar function.

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?

No explicit guidance on when to use this tool versus alternatives. The description implies usage for cost estimation but does not provide context like prerequisites (e.g., requiring an agent wallet) or when to use volume curve overrides. The verb 'estimate' gives implied usage.

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