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

Annotations already cover readOnly/idempotent/non-destructive, so the bar is lower, yet the description adds real behavioral context: unknown codes are reported as missing rather than hallucinated, codes are sound-units not sign language, and output is pronunciation-based rather than an official national braille standard. These are meaningful expectations an agent could not derive from annotations alone.

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-loads the core operation and its most important caveats efficiently. The parenthetical disclaimers and the bilingual Korean line add length but each carries distinct meaning; minor clutter, not waste.

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 two-param, read-only conversion tool with no output schema, the description warns about missing codes, the sound-unit scope, and the non-official braille caveat. The only gap is it doesn't describe the shape of the returned IPA/braille output, which is a minor omission given the annotations.

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 both parameters (lang, codes) are already self-documenting, including the auto-detect behavior and the pointer to braille_languages. The description repeats the code format example but adds no semantics beyond the schema, so baseline 3 applies.

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 and resource (converts WIA Talk ISP codes back to IPA and WIA Braille) with a concrete code example. The reverse-direction sibling talk_text_to_gesture_codes is implicitly distinguishable from the stated direction, so an agent can route correctly.

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?

Usage context is implied by the directionality (codes → text) and the 'unknown codes are listed as missing, never invented' note, but the description never explicitly names the alternative sibling or when to prefer this over talk_text_to_gesture_codes. Guidance is inferable rather than stated.

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