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

With no annotations, the description carries the full burden. It does disclose the token lifetime (7 days), how the token is consumed downstream, and that agentId is chain-verified and optional — genuinely useful behavioral context. However, it says nothing about what happens on an invalid/expired signature, whether the agent name is unique or collides, or whether calling this replaces a prior token.

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?

Two dense sentences, front-loaded with the step and action, followed by the return contract and the one optional-parameter caveat. No filler or restatement of the tool name.

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?

No output schema exists, so the description appropriately documents the return (wallet token, 7-day validity, how to use it). Given five parameters and no annotations, it covers purpose and return well, though the required cryptographic inputs and failure behavior remain undocumented.

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 coverage is only 20% (just `agent`), so the description must compensate. It does add real meaning for `agentId` (optional ERC-8004 id, verified on chain), which the schema leaves as a bare number, but `address`, `nonce`, and `signature` receive no added semantics beyond the implied sign-in flow, so the low-coverage gap is only partly filled.

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 action (sign in with a signature, declare agent identity) and a concrete artifact returned (a 7-day wallet token). The 'Step 2' framing also positions it against the obvious sibling wallet_nonce (step 1), so an agent can distinguish the two without opening either 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?

The 'Step 2' label and the instruction to pass the returned token as `token` to downstream tools give clear sequencing and follow-up context. What's missing is an explicit pointer to wallet_nonce as the prerequisite that produces the nonce/signature, leaving that step to inference.

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