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

Annotations already declare it is a non-read-only, non-idempotent, non-destructive operation. The description adds substantial behavioral context beyond that: the link is one-time, valid for 10 minutes, requires uploading via the returned curl command, and has an environment reachability constraint. This is rich and useful operational detail.

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 tightly written sentences front-load the tool action, then the upload workflow, then the environment restriction and alternative. Every sentence earns its place with no redundancy.

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?

The description covers the full workflow (create link, upload with curl, pass upload_id to vectorize), the key constraint (10-minute validity), and the critical environment fallback to open_editor. With no output schema needed to explain return values, this is complete for correct invocation.

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?

There is one optional parameter, filename, and schema description coverage is 100%, so the schema already documents it as 'Optional file name, for reference only.' The description does not add any syntax, format, or constraint details for filename, so the baseline score of 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?

The description states a specific verb and resource: 'Creates a one-time upload link for a local image file.' It also distinguishes the tool from siblings by naming open_editor as the alternative for incompatible environments and vectorize as the next step, so an agent can route correctly.

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 explicit when-to-use conditions ('Only for agents whose terminal can reach shapesoda.com') and when-not-to-use conditions ('in Claude.ai and other chat apps the sandbox cannot upload there'), plus the exact fallback: 'call open_editor instead.' It also states the follow-up step of passing upload_id to vectorize.

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