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

Annotations already declare readOnlyHint/idempotentHint/non-destructive, so the safety profile is covered; the description adds genuine value with the 30-minute link expiry and the instruction to surface the link to the user. It also scopes the tool to *completed* transcripts, which is a meaningful precondition. Minor gap: it doesn't say what happens when a transcript is still processing.

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?

Three tight sentences: purpose, then use/avoid routing, then the operational caveat about link expiry. Front-loaded and every sentence earns its place.

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?

An output schema exists so return values needn't be explained, yet the description still adds the one behavioral detail an agent needs (link expiry and presenting the link). For a 4-param export tool this is complete.

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%, with enums and per-field descriptions for id, format, includeSpeakers, and includeTimestamps, so the schema does the heavy lifting. The description restates the format list but adds nothing about the boolean flags or how they interact with each format. 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?

Opens with a specific verb and resource ("creates a download link for a completed transcript") and enumerates the supported output formats. It is immediately distinguishable from the read-oriented sibling get_transcript, which the description explicitly names.

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?

Gives an explicit use condition ("when the user wants to download, save, or export a transcript as a file") and names the alternative plus the condition that selects it ("to read a transcript's content into the conversation use get_transcript instead"). No inference required.

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