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

The description adds genuinely useful behavior beyond the readOnlyHint/openWorldHint annotations: hard caps of 2,000 blocks and 100 results, plus a $0.005 USDC x402 payment requirement. It stops short of explaining truncation semantics, default lookback when blocks is omitted, or retry/auth behavior for the paid call.

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 sentences, zero filler, with the scope and filters front-loaded and the cost/limit caveat last. Every clause carries information the agent needs.

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 3-param, zero-required, paid, no-output-schema tool, the definition covers limits and pricing but leaves notable gaps: behavior when no filters are given, default block window, result ordering/pagination, and how to actually satisfy the x402 payment. Adequate but not complete.

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?

With 0% schema description coverage the description must carry parameter meaning, and it partially does: 'token and/or wallet' maps to the token/address params and 'up to 2,000 blocks' maps to blocks. It does not define the block semantics (lookback vs. range), the default used when blocks is absent, or how token and address combine when both are supplied.

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 verb (list) and resource (recent ERC-20 Transfer events on Base) with clear filter dimensions (token and/or wallet). It is distinguishable from siblings like base_tx or base_erc20_balance, but never names or contrasts with an alternative, so sibling routing is left to inference.

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?

Usage is implied by the filter phrasing 'for a token and/or wallet,' telling the agent what inputs select this data. There is no explicit when-to-use versus base_tx / base_receipt, no statement about what happens when both filters are omitted, and no exclusions.

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