google_ads_campaigns_update

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

Discloses partial update behavior, mutability, reversibility via rollback_apply, and a warning about bidding strategy learning periods. Lacks mention of authentication or rate limits, but adds significant value beyond the absent annotations.

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 sentences well-structured: core action, return and rollback, alternative guidance. No filler words, front-loaded with essential info.

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?

Adequately covers return value and reversibility, and references rollback_apply. Could mention prerequisites or error handling but overall sufficient for a 4-parameter update tool without output schema.

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 already covers all parameters with descriptions (100% coverage). The description adds context on partial update, rollback, and a warning for bidding_strategy, enhancing understanding beyond schema.

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 updates an existing campaign with partial update semantics, and distinguishes from the status-only sibling tool by advising when to use the alternative.

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 to prefer the lighter-weight google_ads_campaigns_update_status for status changes, but does not include a hard exclusion or additional when-not scenarios.

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