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

The annotations already establish read-only, idempotent, non-destructive behavior with closed-world scope. The description adds the flashcard-widget usage context, but it does not disclose whether audio is played directly or returned, nor any other runtime behavior beyond what annotations and the output schema cover.

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?

A single sentence that front-loads the usage condition with no redundant or filler content. It is appropriately sized for this simple, well-specified tool.

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?

The description, annotations, complete parameter schema, enum constraint, and output schema together give an agent enough to call the tool correctly. The only gap is that the description does not explicitly state the audio output behavior, but the title and output schema compensate.

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 fully documented in the input schema, including the language enum and the instruction to use the current side's language. The description adds no further parameter semantics, which is a baseline 3 given the strong schema.

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 states the triggering context - flashcard widget requests speech audio for the current card - which clearly implies the tool produces speech audio for that card. It does not explicitly say 'convert text to speech' or describe the output, but the purpose is readily inferable and not a mere restatement of the name.

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?

It gives a clear when-to-use condition: when the flashcard widget requests speech audio for the current card. It does not mention alternatives or when not to use it, but no sibling tool is a plausible substitute, so the guidance is sufficient.

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