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

Beyond the annotations, the description discloses important behavioral traits: hosted builders never receive keypair bytes, the result is an unsigned base64 transaction, and value-moving results must be finalized locally. This is valuable context that annotations alone do not provide. No contradiction with annotations.

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 core purpose is front-loaded in one clear sentence, and the guidance uses labeled sections. However, the 'SAP MCP execution guidance' block is lengthy and duplicates content already embedded in the schema description, making the description somewhat repetitive.

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?

For a 9-parameter builder with an output schema, the description covers the return type, pricing model, routing, and signer boundary. It does not link prerequisites such as trader registration, but these are reasonably inferable from the schema and sibling tool 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?

Schema description coverage is 100%, so baseline is 3. The description adds no parameter-specific meaning beyond the schema; several schema descriptions are generic ('Trader PDA Index parameter for sap phoenix build place stop loss') but that issue lies in the schema, not the tool description.

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 ('Build'), a specific resource ('unsigned Phoenix stop loss order transaction'), and the return value ('transactionBase64'). This immediately distinguishes it from sibling builders like sap_phoenix_build_place_limit_order and sap_phoenix_build_place_conditional_order.

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 operational context: it is a paid builder, call sap_estimate_tool_cost first, use sap_payments_call_paid_tool if x402 is not natively handled, and finalize locally. However, it never explicitly names alternatives or states when to choose this builder over other order builders; the when-to-use is only implied by the tool name and first sentence.

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