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

The description goes well beyond the minimal annotations by disclosing important behavior: the link is single-use, valid for 24 hours, accepts specific formats up to 50 MB, stores the file for 30 days, and returns both a page URL and an upload_id. This gives the agent a clear model of side effects and lifecycle without contradicting 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?

Three focused sentences with no filler. Key facts are front-loaded: the action, the link validity, and the purpose. File formats and size are condensed into a parenthetical, keeping the description scannable.

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 no-parameter tool with no output schema, the description is complete: it explains what the tool does, what constraints apply, and what the caller receives. Nothing an agent needs to select or invoke this tool correctly 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?

The tool has zero parameters, so there is nothing for the description to explain about argument semantics. Per baseline, this is effectively a non-issue; the description still clarifies what the returned upload_id is used for, which is more than required.

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 uses a specific verb ('creates') and resource ('single-use link to a PostWire page') and clearly explains the intended purpose: letting a user upload a photo or video. It is specific enough to distinguish itself from siblings like create_connect_link or get_uploaded_file.

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 description gives clear context for when to use the tool: when the agent needs the user to pick and upload a photo or video from any device. It does not explicitly exclude alternatives or mention sibling tools, but the use case is unambiguous and no conflicting sibling is implied.

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