build_meta_ad_library_url

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

No annotations are provided, so the description carries the full burden. It clearly states the tool only creates a URL for manual use, implying no side effects like fetching, capturing, or storing ad data. It does not detail the output format or error behavior, but for a pure URL generator the behavior is adequately disclosed.

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 a single sentence with no filler. The key action and purpose are front-loaded, and every word contributes to the agent's understanding.

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 tool with six optional parameters and no output schema, the description is nearly complete. It clearly states the result is a public Meta Ads Library search URL for manual research, making the return value obvious. A slightly more explicit note about the URL format or pure string return would make it fully complete.

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 100%, so all six parameters are fully documented in the input schema. The description adds no per-parameter semantics, but it does not need to; the baseline of 3 applies when the schema does the heavy lifting.

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 ('Create') and resource ('public Meta Ads Library search URL'), and the phrase 'for manual competitive ad research' distinguishes it from sibling tools like capture_public_ad_page or record_ad_swipe. An agent can immediately tell this builds a URL rather than performing research or recording results.

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 phrase 'manual competitive ad research' gives clear context for when to use the tool. It does not explicitly name alternatives or exclusions, but the sibling tool names make the distinction obvious, and no strong when-not guidance is needed for a simple URL builder.

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