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

The description discloses that this is a builder that fetches instructions from Phoenix's build-register-ixs API, that the browser assembles and signs them, and that value-moving results must be finalized locally. It clearly states the submit path and the consequence of skipping activation, adding meaningful context beyond the 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 behavior and routing are front-loaded and dense, with no fluff. A small deduction is warranted because the SAP MCP execution guidance paragraph is duplicated verbatim inside the input schema description, adding redundancy.

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?

The description fully covers what the tool does, when it is required, how to submit the result, and the execution/payment flow. With an output schema present and all parameters documented, nothing essential is missing for an agent to invoke this 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 the schema already documents all three parameters, including the conditional nature of maxPositions. The description does not add new parameter-level detail, so the baseline score of 3 applies.

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?

States a specific verb and resource: 'Build Phoenix trader ACTIVATION instructions', and explicitly contrasts with RegisterTrader and the submit step. The mention that it enables all six capabilities including deposit clearly distinguishes it from registration and other Phoenix build tools.

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?

Provides explicit when-to-use guidance: 'ALWAYS required after register', explains that a RegisterTrader-only account is frozen, and directs the agent to submit via sap_phoenix_submit_onboard_trader rather than plain RPC. Also includes routing and pricing guidance for the paid hosted builder flow.

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