google_ads_negative_keywords_add

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

Discloses that the tool is mutating and reversible via rollback_apply. Warns about over-blocking risk. No annotations exist, so description carries full burden; it adds value but could mention side effects like potential performance impact.

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 efficient sentences that front-load purpose, state return values and mutability, and give usage guidance with warning. No redundant information.

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?

Covers purpose, return values, reversibility, and sibling alternative. Without output schema, mentioning created criterion IDs is helpful. Could discuss validation or prerequisites but remains adequate.

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 coverage is 100%, so baseline is 3. The description adds context about match type and plain text usage but does not significantly enhance parameter understanding beyond the detailed schema descriptions.

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?

Clearly states it adds campaign-level negative keywords, specifies they apply to every ad group, and mentions returning created criterion_ids. Distinguishes from sibling tool by explicitly mentioning scope.

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 explicit guidance on when to use this tool vs. the ad-group-level alternative (google_ads_negative_keywords_add_to_ad_group) and warns that campaign-level negatives can over-block if applied too broadly.

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