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

Annotations indicate destructiveHint=true and readOnlyHint=false, implying a write operation. The description adds 'Returns unsigned transaction data,' which is a key behavioral trait—this tool does not execute the transaction but returns data for signing. However, it does not elaborate on the destructiveness (e.g., whether account creation is irreversible) beyond what annotations imply.

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 extremely concise: two sentences that convey purpose, prerequisite context, and return type. Every sentence adds value without redundancy or wordiness.

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's simplicity (2 parameters, no output schema), the description fully covers the essential aspects: purpose, when to use, prerequisites, and what it returns ('unsigned transaction data'). No gaps remain for an agent to misunderstand.

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?

Both parameters have 100% schema description coverage with detailed explanations (e.g., configId format, signerAddress requirement). The tool description reiterates the signerAddress's role ('for signerAddress') but adds no new meaning beyond the schema. Baseline 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 the action ('Creates a buyer account') and the specific actor ('signerAddress'). It distinguishes this tool from siblings like 'create_seller' and 'commit_to_buyer_offer' by explaining its prerequisite role: 'Required before a buyer can commit to seller-initiated offers for the first time.'

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 explains when to use this tool ('before a buyer can commit to seller-initiated offers for the first time') and notes there are 'No prerequisites.' It does not explicitly state when not to use it or compare to alternatives, but the context is clear enough for an agent to decide.

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