google_ads_campaigns_create

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

Discloses mutating nature, write quota impact, and reversal behavior. With no annotations, it covers key behavioral aspects but lacks details on auth or error handling.

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?

Four focused sentences front-load the primary action and return, then cover mutation, prerequisites, and alternatives. No filler.

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?

Despite no output schema, the description explains return fields (resource_name, id), prerequisites, behavioral notes, and alternative tools. Covers all essential aspects for a creation tool.

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?

Adds significant context beyond the schema: default values for bidding_strategy and channel_type, and limitations on TARGET_CPA/TARGET_ROAS. The budget_id prerequisite is highlighted.

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 it creates a Search or Display campaign, specifying the resource and action. It distinguishes itself from sibling tools like update and list tools by focusing on creation.

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?

Explicitly states prerequisite (budget_id) and directs to google_ads_budget_create if needed. Provides alternatives for later edits (update/update_status) and mentions reversibility via rollback_apply.

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