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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It calls itself a 'proxy', which hints at forwarding to an external service, but it doesn't disclose API key usage, response format, error behavior, supported audio formats, or rate limits. For a tool with no annotations, this is insufficient behavioral transparency.

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 extremely concise at two short sentences, front-loading the primary purpose ('Speech-to-text proxy') and immediately stating the input/output contract. Every word earns its place with no redundancy or filler.

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 tool is simple with only two fully-documented parameters, but there is no output schema and the description does not specify the return format or error conditions. The description is adequate for a basic understanding but incomplete for an agent to confidently handle edge cases or parse the response reliably.

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 the schema already documents both parameters ('Base64-encoded audio bytes' and 'SimpleFunctions API key'). The description adds no additional parameter semantics beyond what the schema provides, so the baseline score of 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?

The description clearly states the tool performs speech-to-text conversion ('Speech-to-text proxy', 'get transcribed text'). It distinguishes itself from the sibling tool 'tts' which is text-to-speech, making the purpose unambiguous. The main verb is implied ('get') rather than explicitly stated, but the meaning is clear.

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 gives clear context: pass base64-encoded audio and receive transcribed text. It implies the usage scenario (audio input to text output) but doesn't explicitly name alternatives or exclusions. The sibling tool 'tts' provides contrast, but no direct guidance is given on when to choose this over other tools.

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