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

Beyond the annotations (readOnlyHint=false, destructiveHint=true, idempotentHint=false), it discloses meaningful behavior: the link is single-use with a ten-minute expiry, accepted types, the 15 MB cap, and that ingested content lands under 'Potential facts'. It omits what happens if the link expires unused or how uploads are attributed, but the safety-relevant surface is well covered relative to the 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?

The lead sentence is front-loaded, but the body drifts into backtick-heavy jargon and smuggles in instructions for a different call path ('posts it to `upload` as multipart field `file`'), which the reader cannot act on here. Sentences like 'Read as a file dropped on the owner's screen is; what it finds waits under Potential facts' cost attention without clarifying behavior.

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 single-optional-parameter tool with no output schema, the description carries most of the needed burden and does explain input types, size, link lifetime, and where results appear. However, it never explains the `part` pagination parameter that the schema exposes, and its two-mode narrative would leave an agent unsure which invocation shape this tool actually supports.

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 sole `part` parameter, so the schema baseline would be 3, but the description never mentions `part` and instead documents fields (`url`, `say`, `upload`, `file`, `statement`, `max_size`) that do not exist in the input schema. That mismatch leaves an agent unable to reconcile the prose with the actual argument it must pass.

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 names a concrete outcome — issue a one-file, one-use, ten-minute link that puts a file into the owner's Ilu — and explicitly contrasts it with `propose`. It is muddied by also narrating a separate direct-upload mode and opening with 'Keep a file itself', a phrase that overlaps the sibling tool `keep`, so the agent can identify the tool but not without parsing ambiguity.

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?

It gives an explicit when-to-use ('when the person wants a file itself kept... or when you can send a file yourself') and an explicit when-not with the alternative named ('Do not use for a document you can read in this chat to propose its values; that is `propose`'). It also separates the two operating modes by caller capability, which is exactly the routing decision an agent faces.

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