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

No annotations are provided, so the description carries the full disclosure burden, and it discloses nothing: not whether signature recovery is deterministic, which chain/curve it assumes, whether it validates the signature, or what happens on failure. The entire behavioral profile is absent.

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?

It is short, but the brevity comes from having no content rather than from efficient phrasing — the same two words repeated with a colon. Nothing is front-loaded because nothing is stated.

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 cryptographic recovery tool with four undocumented, unrequired, no-output-schema parameters, the description supplies none of the domain context an agent needs (signature scheme, input precedence, expected output). It is completely inadequate relative to the tool's complexity.

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% (every parameter has a description), which sets the baseline at 3 under the scoring rules. However, the schema text itself is vacuous ('Sig to process', 'Message to process'), so nothing clarifies the near-duplicate sig/signature or text/message pairs, and all four parameters being optional is never explained.

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 is literally the tool name with a colon: 'Eth Recover: Eth Recover'. It restates the title verbatim and conveys no verb, resource, or scope beyond the name. An agent cannot tell from this what 'recover' operates on or produces.

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?

There is no when-to-use guidance, no prerequisite, and no mention of any alternative among the ~2000 siblings. Nothing distinguishes this from x402-eth-sign, x402-verify, or x402-wallet-* tools.

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