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

Annotations already declare readOnly/idempotent/non-destructive/openWorld=false, so the safety profile is covered. The description adds genuinely non-structured behavior: it returns IPA plus braille cells and quality/confidence scores, and low-quality results are flagged rather than hidden. That return-value behavior matters because there is no output schema.

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 core conversion and the crucial caveat about non-official braille, then the return/quality behavior. Slightly padded by the Korean sentence that restates the English content rather than adding new information, which costs a point.

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 usefully summarizes the return shape (IPA, braille cells, quality), and the annotations cover safety. Nothing essential for calling the tool is missing, though a supported-language pointer would have closed the only real gap.

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 every parameter (dots, lang, text) is already documented, including the 6-dot/8-dot distinction and the braille_languages referral. The description merely restates the two dot forms and adds nothing about lang or text handling, so 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 and resource (converts text to WIA Braille) and pins down the variant with the parenthetical 'pronunciation-based common braille (NOT an official national braille code)', which separates it from the math/Nemeth and BRF siblings. It does not explicitly name or contrast any sibling tool, so routing still needs inference.

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 text-to-braille direction is implied clearly enough to know what this is for, and the 'not an official national braille code' note warns of a key limitation. But there is no when-to-use versus braille_math_nemeth or braille_to_brf, and the schema's own pointer to braille_languages for supported codes is not echoed in the description.

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