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

With no annotations, the description carries the full burden for behavioral disclosure. It adds useful context: the exact cost ($0.008 via x402), that it is a read operation, the live data source (Blockscout), and supported networks. It does not cover rate limits, failure modes, or invalid-hash behavior, but for a simple read lookup it provides solid transparency.

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 compact and front-loaded, packing the core purpose, returned fields, use case, networks, source, and cost into four short sentences. It earns its length, though the second sentence contains a grammatical awkwardness ('The read every...') and the structure could be slightly cleaner.

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 tool with 3 simple parameters and no output schema, the description covers the essentials: what it returns, which chains it supports, how it is paid for, and where the data comes from. It could be more complete by explaining x_payment and possible error conditions, but it is sufficient for a low-complexity lookup tool.

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 schema already documents hash and chain, covering 67% of parameters, so the description does not need to repeat those basics. It adds value by explaining the hash-based lookup and supported chains, but it does not explain the undocumented x_payment parameter or connect the '$0.008 via x402' pricing to that parameter. Thus it stays at the baseline rather than rising above it.

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 action ('look up any transaction by hash') and the specific resource (transaction status by hash), while enumerating the returned fields: confirmation status, block number, confirmations, value, from/to, fee paid, gas used, and decoded method. It also frames the exact use case for settlement, trading, and payment agents, making it easy to distinguish from the many sibling chain tools.

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 provides clear context for when to use it: 'The read every settlement, trading and payment agent polls after sending a tx to confirm it landed.' It also gives practical guidance about using one paid call instead of running an RPC. However, it does not explicitly name alternatives or state when not to use it, so it stops short of a 5.

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