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

Annotations already indicate read-only, open-world, and non-destructive behavior. The description adds meaningful transparency beyond these: it says the operation returns unsigned typed data and a zero-value transaction, that mismatched or paused targets fail closed, and that the external wallet performs the actual signing and submission. This goes beyond the structured metadata without contradicting it.

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?

Three concise sentences, with the central action front-loaded and every sentence adding distinct value: what the tool prepares, what it returns, and the failure behavior. The workflow note about the external wallet signing and submitting is also useful and not redundant.

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 single required parameter, the rich annotation context, and the presence of an output schema, the description is nearly complete. It clearly explains the output behavior and the failure mode. The only slight gap is that it could be more explicit about what the 'agent' parameter represents relative to the claim, but the overall context 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?

There is only one parameter and the schema already provides 100% coverage with 'agent' described as 'EVM address.' The description does not add much new semantic meaning for the parameter, such as explicitly confirming that the agent address is the wallet holding the claim. Per the schema-coverage baseline, a 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 identifies the tool's purpose: prepare a canonical one-wallet Ethereum claim and return unsigned typed data plus a zero-value transaction. The scope is specified with 'when open' and 'paused or mismatched targets fail closed.' It does not explicitly distinguish itself from closely related siblings like prepare_agent_entry_claim or prepare_public_claim, which keeps it from a 5.

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 clear contextual guidance: use it to prepare a claim when it is open, and expect the external wallet to sign and submit. This implies the appropriate workflow and sets a precondition. It does not explicitly state exclusions or recommend an alternative tool, but the context is strong enough to orient an agent.

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