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

No annotations are provided, so the description carries the full behavioral burden. It discloses that it costs $0.01, which is important context for an agent making a paid call, but doesn't describe authentication requirements, rate limits, or whether the data is cached. The cost disclosure is a useful addition that annotations would not cover.

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?

A single, dense sentence that front-loads the purpose, then lists the key outputs in a compact prose list. Every clause earns its place, and the cost is stated at the end without disrupting readability.

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 single-input tool with no output schema, the description covers purpose, output contents, and cost, which is sufficient to call it correctly. It does not mention error handling or edge cases, but the core requirements for an agent to invoke it are present.

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 coverage is 0%, but there is only one parameter (hash), and the schema defines a precise regex pattern (^0x[0-9a-fA-F]{64}$) which is self-explanatory. The description does not add any meaning about the hash parameter beyond what the schema provides, but with a single well-constrained parameter, minimal compensation is needed.

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 (Explain) and resource (BNB Smart Chain transaction), then enumerates exactly what is returned: status, fee, decoded method with args, and ERC-20 transfers. The BSC chain is explicitly stated, which cleanly distinguishes it from the sibling ethereum_tx_explain and base_tx_explain 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 implies when to use it (to decode/explain a transaction) but gives no explicit guidance on when-not-to-use or alternatives. Since the only other tx_explain tools are for different chains, the implicit routing is sufficient, but no exclusions or prerequisites are stated.

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