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

Annotations already cover safety (readOnly, non-destructive, openWorld), and the description adds concrete rate limits (10 calls/minute, one call per 6s) and a deprecation warning. It does not say when the endpoint will be removed or what supersedes it, which is the one meaningful gap.

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 short sentences, front-loaded with the deprecation warning, then semantics, then limits. Every clause carries actionable information with no filler.

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?

With no output schema and no parameters, the description carries the full burden and does so: it states what is returned (the version string), where it is used (EIP-712 domain for withdrawal signing), and the rate constraints.

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 takes zero parameters, so there is nothing for the description to disambiguate; the 0-param baseline applies. No misleading parameter claims are made.

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?

Specific verb (Get) plus precise resource ('contract signing version string required for the EIP-712 domain data used when signing a withdrawal'), which separates it from the withdrawal-status and prepare_withdrawal siblings. The [DEPRECATED] marker further qualifies its role.

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?

Tells the agent the value 'rarely changes' and is 'safe to cache client-side', which is real operational guidance. It stops short of naming a replacement tool despite flagging deprecation, so the agent has no explicit migration target.

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