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

Annotations already establish that this is a read-only, non-destructive, closed-world operation. The description adds useful detail about what is returned—historical destinations, next contracts/endpoints, and first/last read times—but does not cover not-found behavior, pagination, or response format.

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?

The description is a single compact sentence fragment with no wasted wording and front-loads the returned content. It is appropriately sized, though the fragmentary phrasing slightly weakens clarity.

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 simple one-parameter read tool, the description covers the returned data reasonably well and annotations cover safety. However, it omits usage distinction from the sibling search tool and does not describe error or empty-result behavior, leaving some gaps.

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%, and the single address parameter is fully documented with a pattern in the schema. The description adds no additional meaning about the parameter itself, so the baseline of 3 applies.

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 identifies the specific resource and scope: one contract, with destinations over time, next-named contracts/endpoints, and first/last read timestamps. It is clear enough to distinguish a single-contract lookup from the list-oriented sibling search_etherhiding_contracts, though it lacks an explicit action verb.

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 explicit guidance on when to use this tool versus search_etherhiding_contracts, nor any stated prerequisites such as needing a known contract address. The singular 'One contract' phrasing only weakly implies the intended use case.

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