update_ad

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

With no annotations, the description carries the full burden. It explicitly states this is a write operation and mentions updating status (includes DELETED via enum), but does not disclose implications of creative swap or any authentication or rate limit requirements.

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 sentences, no fluff. The critical action is front-loaded with 'WRITE' prefix, and the second sentence provides a concrete example. Every word earns its place.

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?

While the description lists updatable fields, it omits important context: return value, prerequisites, behavior of swapping creative (e.g., is the old creative deleted?), and that only ad_id is required. For a write tool with 4 params and no output schema, this is insufficient.

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?

Schema description coverage is only 25% (creative param has description). The description adds minimal meaning: it lists name, status, and creative as updatable fields but does not explain ad_id, nor does it elaborate beyond what the schema already shows for creative. It does not compensate for low coverage.

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?

Description starts with 'WRITE: Update an ad's name, status, or swap its creative.' This clearly states the verb (update) and resource (ad) with specific modifiable fields, effectively distinguishing it from sibling tools like delete_ad or create_ad.

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?

Provides a specific usage tip for replacing the creative, but lacks guidance on when to use this tool versus alternatives (e.g., update_adset) and does not exclude any scenarios.

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