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

Goes well beyond the annotations: the ticket belongs to this account, expires in 15 minutes, is single-use and consumed on talk creation, is never a public link, and requires the same Aitho authorization header on the PUT. It also explains the side-effect-free transport (bytes bypass the conversation). The annotations only declare non-readonly/non-idempotent; the description supplies the real operational constraints.

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?

Four dense sentences, front-loaded with purpose and immediately followed by the return values and the handoff to aitho_create_talk. Every sentence carries new information (auth header, size/length tradeoff, expiry semantics), though it is longer than strictly minimal.

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 still documents both return values and their meaning, plus lifecycle (expiry, single-use, consumption) and the required follow-up call. Nothing an agent needs to invoke and chain this tool is missing.

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% for the single filename parameter, so the schema already documents it fully. The description restates the accepted extensions (.pdf, .pptx, .ppt) without adding format or syntax detail beyond the schema, so the baseline 3 applies.

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+resource ('prepare ... deck upload') and precisely what it produces: a short-lived single-use upload_url and upload_id for one deck file. It clearly distinguishes itself from siblings by naming aitho_create_talk as the consumer of upload_id, so an agent knows this is a pre-step, not the talk creation itself.

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 clear context for when to call it (user attached a deck, or a deck was made in the conversation) and explicitly routes the output to aitho_create_talk via deck_upload_id. It does not state a 'when not to use' or contrast with an alternative upload path, which keeps it short of a 5.

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