cast_calldata_decode

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

No annotations are provided. The description does not disclose error handling, return format, or any side effects. For a decode operation, it is likely read-only, but this is not stated, and the behavior on invalid calldata is omitted.

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?

One sentence, 10 words, with no filler. The parenthetical 'with 4-byte selector' is included efficiently. Every part is essential.

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 is adequate for a simple two-parameter tool, but it lacks specification of the return value format (e.g., decoded arguments as tuple or array). Since there is no output schema, this is a gap. Error cases are not mentioned.

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 100%, so baseline is 3. The description adds value beyond the schema by providing an example for signature (e.g., 'transfer(address,uint256)') and clarifying the calldata format (0x-prefixed, includes 4-byte selector).

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?

Description specifies verb 'Decode', resource 'raw transaction calldata', and output 'function arguments', with parenthetical clarifying the inclusion of the 4-byte selector. It clearly distinguishes from sibling tools like cast_abi_decode by mentioning the raw transaction calldata context.

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?

No explicit guidance on when to use this tool versus alternatives like cast_abi_decode. Usage is implied from the tool name and description, but no exclusions or when-not-to-use advice is provided.

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