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

Adds substantial context beyond the annotations: the file is fetched once, held in memory, and discarded; the call consumes account minutes (which explains the non-readonly, non-idempotent hints); and the output shape varies by flag. The instruction to treat transcript text as content rather than instructions is an unusually valuable safety disclosure for an open-world 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 action and its input constraint lead, followed by constraints, cost, return format, and the injection caveat. Every sentence adds a distinct fact an agent needs; nothing is redundant with the schema or annotations.

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?

With no output schema, the description carries the return-value burden and does so, covering both output modes. Combined with format/size limits, cost, and data-handling behavior, an agent has everything needed to call this correctly.

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 coverage is 100%, so the baseline is 3, but the description adds consequences the schema lacks: 'speakers' produces one line per speaker turn and 'word_timestamps' switches the return to JSON. It does not explain the url parameter beyond the schema, so it is not a full 5.

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?

States a specific verb (transcribe) plus the resource type (English speech in audio/video) and the decisive constraint (public https link). The 'public https link' qualifier cleanly separates it from transcribe_audio, transcribe_upload, and create_upload_link without opening their schemas.

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 link requirement and format/size limits give clear context for when this tool applies, and 'uses the account's minutes' hints at the cost tradeoff. It never explicitly names a sibling or states when not to use it (e.g., local files should go through transcribe_upload), so it falls short of full routing guidance.

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