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

The annotations already declare readOnlyHint=true/openWorldHint=true, but the description adds genuine context beyond them: it discloses the return artifact (an open_url that loads the scripts into UGCfy AI for rendering), which tells the agent the tool generates content rather than mutating stored data. It does not cover auth, rate limits, or failure behavior, so it is useful but not exhaustive.

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 tight sentences, front-loaded with the action and deliverable, then the usage condition, then the return value. No filler and nothing repeated from the title.

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 carries the return-value burden itself and does so by naming the open_url and its downstream effect (rendering in UGCfy AI). Purpose, usage condition, scope, and return are all covered for a one-parameter generation tool.

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 a single parameter with 100% schema description coverage, so the schema already documents the URL-or-description input. The description's '(link or description)' wording merely mirrors the schema, adding no new syntax, format, or constraint detail; baseline 3 is appropriate.

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 (write) and resource (UGC video ad scripts), and quantifies the output precisely: 4 complete 20-30 second scripts, scene by scene, with different angles, plus the product profile. It also names what the tool produces beyond scripts (benefits, proof points, objections), which lets an agent distinguish it from generate_hooks or breakdown_ad without opening the schema.

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 selection condition: 'Use this when there is no reference ad to copy,' which implicitly rules out the sibling rewrite_ad_for_product. The context is clear, but the alternative is never named directly, so the agent must infer which sibling the exclusion points to.

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