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

Beyond the annotations, the description adds valuable behavioral context: the URL is authenticated and short-lived, plan limits are enforced before upload, and allowed file formats are specified. It also clarifies that the tool creates a URL rather than performing the actual upload. No contradictions with annotations.

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, front-loaded with the core action, followed by key constraints. Every phrase carries meaning; there is no filler or redundancy.

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 is complete enough for calling the tool: it states the purpose, accepted file types, and key constraints, and an output schema exists to document return values. Minor gaps remain around the specifics of plan-limit enforcement and the exact lifetime of the URL, but these are not required to make the call.

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 fully documents the parameters. The description adds contextual framing around audio file upload and plan-limit enforcement, but it does not add per-parameter meaning beyond what the schema already provides. 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?

The description states a specific action ('Create'), a specific resource ('authenticated short-lived S3 upload URL'), and a precise scope (WAV, MP3, AIF, or AIFF files). It clearly distinguishes itself from analysis or download siblings by focusing on creating an upload URL rather than performing analysis or retrieval.

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 when to use this tool: when an audio file needs an S3 upload URL before analysis/upload. It names no alternatives, exclusions, or explicit conditions for choosing a sibling tool, leaving some inference to the agent.

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