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

Annotations already signal read-only and non-destructive behavior, but the description adds important operational boundaries: it is Sepolia-only and never signs or submits anything. This tells the agent exactly what will and will not happen, which goes beyond the annotation surface. There is no contradiction with the readOnlyHint.

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 two short sentences with zero filler. The most decision-relevant facts—unsigned, ACCEPT typed data, Sepolia-only, never signs or submits—are front-loaded and every phrase earns its place.

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?

The description, combined with the output schema, annotations, and well-covered input schema, provides everything an agent needs to select and invoke this tool correctly. There is no missing critical behavioral, network, or safety context.

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 input schema already contains 89% parameter coverage with patterns and descriptions for addresses, hashes, and decimal strings. The tool description itself adds no parameter-level detail beyond the 'ACCEPT' typed data context, so the description does not meaningfully enhance what the schema already provides. This aligns with the baseline-3 expectation for high schema coverage.

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 clearly names the specific verb ('Prepare unsigned ACCEPT typed data') and the exact resource ('historical 0 ETH Sepolia public allocation'). It also disambiguates from the many sibling prepare_* tools by highlighting the network and the public/claim context. This is far more specific than a generic claim-preparation description.

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 description gives a clear context: Sepolia only, and only for the historical 0 ETH public allocation. It also explicitly says the tool 'never signs or submits', which rules out certain mistaken use cases, though it does not name an alternative tool for signed submission. This is strong guidance but stops short of explicit routing.

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