decode_hex

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions the output formats (UTF-8, ASCII, bytes) but doesn't specify how the tool behaves—e.g., error handling for invalid hex, whether it returns multiple outputs or a single format, or performance considerations. This leaves significant gaps for a mutation-like tool.

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 a single, efficient sentence that front-loads the core functionality without any wasted words. It directly communicates the tool's purpose in a structured manner, making it easy to parse quickly.

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 one parameter and no output schema, the description is minimally adequate but incomplete. It lacks details on output structure, error cases, or behavioral nuances, which are important given the absence of annotations. The high schema coverage helps, but more context would improve usability.

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 input schema has 100% description coverage, with the 'hex' parameter clearly documented. The description adds no additional parameter semantics beyond what the schema provides, such as format constraints or examples. Given the high schema coverage, the baseline score of 3 is appropriate.

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 states the tool's purpose: 'Decode hex string to UTF-8, ASCII, and bytes.' It specifies the verb ('decode') and resource ('hex string'), and indicates the output formats. However, it doesn't explicitly distinguish from siblings (e.g., 'convert_units'), which prevents a perfect score.

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 no guidance on when to use this tool versus alternatives like 'convert_units' or other data transformation tools in the sibling list. It lacks context about typical use cases or exclusions, offering only a basic functional statement.

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