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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the agent knows this creates a link rather than a destructive write. The description usefully adds the manual browser flow and the post-upload handoff, but says nothing about link expiry, one-time use, or auth requirements for a tool whose whole output is a capability URL.

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?

Two short sentences, front-loaded with what the tool returns, then the follow-up workflow. Some phrasing is awkward ('for chat apps without a shell') but nothing is wasted.

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 need not be described. For a zero-parameter tool, the description covers what it produces and what to do next, which is everything the agent needs before invoking it.

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?

The tool takes zero parameters, so the baseline of 4 applies; there is no parameter surface the description needs to compensate for, and it correctly refrains from inventing inputs.

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 the concrete artifact returned (a link the user uploads photos/video through from a browser) and the narrow scenario it serves (chat apps without a shell). It is clearly distinguishable from the list/confirm tools, though it never contrasts itself with the obvious siblings start_image_upload / start_video_upload, which also initiate uploads.

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 a qualifying condition (chat apps without a shell, browser-based) and a follow-up sequence (after upload, call list_images or list_videos). However, it never says when to prefer this over start_image_upload / start_video_upload, which are the sibling tools an agent would otherwise reach for, so the selection guidance is only implied.

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