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

Beyond the annotations (readOnlyHint=false, destructiveHint=false), the description states this is a write-oriented workflow, requires prior upload via upload_image/upload_video, and discloses bulk support through array parameters. It also adds the destructive delete pointer, which helps the agent avoid assuming this tool handles deletion.

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 description is compact, front-loaded with the main purpose, and uses structured sections for actions, requirements, and bulk behavior. There is slight overlap between the action bullets and the later create_creative detail, but the text avoids unnecessary padding.

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 high-parameter, no-output-schema write tool, the description provides useful context: final launch step, required media dependencies, CTA examples, and bulk support. It still leaves gaps around success return values, how account/auth_account would be used, and the exact behavior of the optional ad creation/update parameters.

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?

Since the schema has 0% description coverage, the description must compensate, and it does explain key parameters: page_id, image_hash/video_id, message, call_to_action_type, and the bulk plural IDs. However, several parameters such as link, name, account, auth_account, creative_id, and status remain unexplained, so compensation is partial for 18 total parameters.

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 clearly states the tool "Create ad creatives and ads (final step to launch)" and explains the core create_creative action with media and copy requirements. It does not strongly differentiate itself from the sibling tools meta_ads_creative_write_create_ad and meta_ads_creative_write_update_ad, and actually lists create_ad/update_ad inside its own description, which prevents a score of 5.

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 useful conditions: create_creative requires page_id and either image_hash or video_id plus message, and it directs destructive operations to meta_ads_creative_delete. However, it does not explicitly say when to favor the sibling create_ad/update_ad tools or when not to use this tool, so usage guidance remains mostly implicit.

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