encoding_decoding_base91

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

Without annotations, the description carries full burden. It states the tool is an encoder/decoder, implying no destructive side effects, which is appropriate. However, it does not disclose any other behaviors (e.g., rate limits, input constraints) beyond the basic function. The reference to describe_tool partially compensates.

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 relatively concise (4 sentences) and front-loads the purpose. However, it includes redundant phrasing ('Base91 Encoder/Decoder' repeated) and a technical detail that could be merged. Overall, it is well-structured but could be tightened.

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 three required, undocumented parameters and no output schema, the description is insufficient. It explains the basic function but omits parameter meanings, use cases, and limitations. The pointer to describe_tool acknowledges the gap but does not fill it within this description.

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% with three required parameters. The description adds minimal meaning: 'Base91 Encoder/Decoder' hints that 'operation' likely expects 'encode' or 'decode', and 'compact data representation' might relate to 'format', but no explicit details are provided. The description does not compensate for the lack of schema descriptions.

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 explicitly states 'Base91 Encoder/Decoder' and 'Efficient binary-to-text encoding', clearly identifying the tool's function and distinguishing it from sibling encoding tools. The verb 'encode/decode' and resource 'base91' are specific.

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 mentions 'compact data representation' as a use case but does not provide explicit guidance on when to use this tool over alternatives like base64 or ascii85. No when-not-to-use or exclusion criteria are given, and the reference to describe_tool only shifts the burden.

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