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

With no annotations supplied, the description carries the full behavioral burden, and it does disclose a significant trait the schema cannot: this call is monetized at $0.01 USDC on Base via x402, so the agent knows a payment flow is involved. It omits other relevant behaviors — how pending/unconfirmed or unknown hashes are handled, whether a failed read still charges, and any rate limits — so it is partial rather than complete.

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, both earning their place: the first front-loads the returned data, the second front-loads the payment requirement. Nothing is repeated from the schema and there is 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?

For a simple two-parameter read tool with no output schema, the description effectively stands in for the missing return documentation by enumerating the fields returned and the explorer links. It also surfaces the paid-call requirement, which the structured fields do not; only edge-case behavior (pending transactions, error paths) is left unaddressed.

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% with only two parameters, and the schema already documents the enum of chains and the 0x-prefixed hash format. The description adds no parameter-level meaning (e.g., default chain behavior or cross-chain caveats), so baseline 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 names a specific verb and resource ('Get a transaction's status') and enumerates exactly what comes back: block, timestamp, from/to, value, gas used, fee, and explorer links. It does not, however, distinguish itself from the sibling verify_receipt, which plausibly covers overlapping receipt data, leaving the agent to infer the boundary.

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 and no mention of the siblings (address_activity, verify_receipt, wallet_balance). The only situational information is the payment note, which tells the agent what it costs but not when to prefer this tool over verify_receipt for receipt-shaped data.

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