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

Annotations already provide readOnlyHint and idempotentHint, indicating safe, idempotent behavior. The description adds that the tool returns a direct download URL for an MP3 file, specifying the output format. No contradictions or hidden behaviors are missing given the simple nature of the tool.

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 a single, front-loaded sentence with no unnecessary words. Every word adds value: verb, resource, output format, and input requirement are all included efficiently.

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 simple tool with one parameter, output schema, and comprehensive annotations, the description provides all necessary context. It clarifies the return type (direct download URL) and ties the input to another tool (get_recordings) via schema description.

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?

The single parameter 'id' is fully described in the schema (100% coverage) with context about where to obtain it. The description merely repeats 'by recording ID,' adding no new semantic information beyond the 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 clearly states the action (get a direct download URL), the resource (call recording MP3 audio file), and the required input (by recording ID). It distinguishes itself from sibling tools like get_recordings (which lists recordings) by specifying the exact output.

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 implies usage after obtaining a recording ID from get_recordings, but it does not explicitly state when to use this tool over alternatives or provide any exclusion criteria. The context is clear enough for an AI agent to infer typical use.

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