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

No annotations are provided, so the description must fully disclose behavior. It describes the return value and purpose but does not mention any side effects, rate limits, permissions, or safety guarantees. For a read-only operation returning a configuration-level address, the description is adequate but lacks proactive disclosure of non-state-changing behavior.

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 a single sentence that front-loads the primary outcome (returns the EOA address) followed by essential usage advice. Every word contributes meaning, and there is no redundancy. It is optimally concise for the tool's simplicity.

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 (no parameters, no output schema, no annotations), the description fully covers what the tool does and when to use it. The agent gains a complete understanding of its purpose and role without needing additional information.

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?

The tool has zero parameters with 100% schema coverage (empty object). The description adds value by confirming the tool requires no input and explaining its purpose. For a zero-parameter tool, a baseline of 4 is appropriate, and the usage context further justifies the score.

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 returns the EOA address controlled by the server's FUSE_PRIVATE_KEY. It also specifies the resource (signer address) and verb (get), making the purpose unambiguous. No sibling tool performs the same function, so no confusion.

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 explicitly instructs to use this tool before any write tool to confirm the gas-paying account. This provides clear when-to guidance and explains the rationale, though it does not explicitly mention when not to use it. The context is sufficiently clear for agent decision-making.

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