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

readOnlyHint=true is consistent with a tool that only produces typed data and never signs or sends, so there is no contradiction. The description adds real behavioral context beyond the annotation: the default spender is the protocol diamond, signing happens locally, and the return is a typedData payload plus a transferAuthorization template (strategy 'ERC3009').

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 densely-packed sentences that are front-loaded with the operation and end with the write/send instructions. Slight redundancy in the trailing 'Returns: typedData to sign + transferAuthorization template' sentence, which echoes earlier content, keeps it from being maximally tight.

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 crypto tool with no output schema, the description supplies the missing return shape and downstream integration path, which covers the main gaps. It could still say more about how it relates to the sibling permit variants, but nothing essential for correct invocation is absent.

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 baseline is 3. The description restates value, signerAddress, validAfter and validBefore, and notes the spender default, but adds little syntax or format detail beyond what the schema already documents.

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 ('Generates EIP-712 typed data') and a precise resource (ERC-3009 ReceiveWithAuthorization, e.g. USDC). The named standard implicitly separates it from the sibling sign_receive_with_dai_permit, sign_receive_with_erc2612_permit and sign_receive_with_permit2 tools, so an agent can route without opening the schema.

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?

Gives a clear workflow: sign locally with EIP-712, attach the signature to the returned transferAuthorization, and pass it through send_meta_transaction.transferAuthorizations, explicitly naming the downstream tool. It lacks an explicit statement of when to choose ERC-3009 over the other permit variants, so it stops short of full exclusion guidance.

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