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

Annotations only declare the safety profile (readOnly=false, destructive=false, openWorld=false). The description adds real value beyond them by disclosing that inputs are detected via filename extension OR file signature, which is a non-obvious behavioral trait (misnamed uploads still work). It does not clarify that output is a newly produced file, leaving one small gap.

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?

Front-loaded with the purpose, then terse Input/Output format lists, with no filler. The trailing [category: convert] tag is brief metadata that does not bloat the definition.

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?

With no output schema, the description carries the burden of describing results; it thoroughly covers accepted and produced formats but never states what is actually returned (e.g., a converted file/download). That single gap keeps it from being fully complete for a conversion 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?

Schema description coverage is 100%, so both parameters are already documented, including the 'to' enum values and the 200MB limit. The description's format lists largely restate the enum and accepted input types, adding little beyond the schema. Baseline 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?

States a specific verb+resource ('Convert between archive formats') and enumerates concrete input and output formats, so the scope is unambiguous. It does not name or differentiate from adjacent siblings such as files_zip, files_unzip, or convert_file, which keeps it at 4 rather than 5.

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 input/output format lists imply the usage context (you have one listed format, want another), but there is no explicit when-to-use guidance, no exclusions, and no pointer to alternatives like files_zip/files_unzip. Usage must be inferred from the format coverage.

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