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

The description discloses key behavioral traits: it is local, does not read chain state, uses SDK, and is part of the payment/settlement flow. Annotations are readOnlyHint=false and destructiveHint=false, which are consistent with a pure calculation that has no side effects. The description adds value beyond annotations by specifying the local nature and SDK usage.

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 fairly concise and front-loads the core purpose. However, it includes some generic 'SAP MCP execution guidance' that may be redundant across tools. Could be slightly tighter but is still efficient.

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 has an output schema and is a straightforward calculation, the description adequately covers purpose, behavior, and usage context. It doesn't cover error cases or limitations, but for this simple tool, completeness is sufficient.

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% with all four parameters described in the input schema. The description does not add additional semantics beyond the schema; it merely mentions the tool calculates cost. Given high schema coverage, baseline of 3 is appropriate.

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 it is a 'pure local cost calculation' using a specific SDK method, and explicitly says it 'does not read chain state'. This distinguishes it from siblings that may interact with chain state or perform other operations like building payments or settling.

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 usage context: 'SAP MCP context: Payment and settlement flow. Estimate or fetch state before creating escrows or settling calls.' This tells the agent when to use the tool. However, it doesn't explicitly differentiate from the sibling tool 'sap_x402_estimate_cost' or provide when-not-to-use guidance.

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