google_ads_generate_ad_group_themes

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

With no annotations provided, the description carries the behavioral disclosure burden. It explicitly states the operation is read-only, does not create or edit keywords, and is a Keyword Planner RPC. It also discloses the return contents (suggested pairings, normalized text, suggested match type), which is meaningful behavioral context beyond the schema.

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 two tightly written sentences with no filler. It front-loads the primary action and immediately states the read-only, non-mutating nature, then lists the return payload. Every sentence adds essential 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?

For a three-parameter tool with no output schema, the description is remarkably complete: it explains the operation, the input context (supplied keywords, existing ad groups), the outputs, and the fact that no changes are made. The schema handles parameter bounds and identity, so nothing critical is missing for an agent to invoke it correctly.

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?

The schema describes adGroupIds and customerId but not keywords. The description compensates by clarifying that keywords are supplied text inputs and that the tool organizes them, while also hinting at keyword normalization and match type in the output. This adds useful meaning around the keywords parameter even though the schema does not describe it directly.

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 ('organize') and resource ('supplied keywords into existing Google Ads ad groups'), and clearly names the output: suggested ad group/campaign pairings, normalized keyword text, and suggested match type. It also distinguishes itself from read-only query tools by stating it does not create or edit keywords.

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 description implies when to use this tool: when you already have keywords and existing ad groups and want them organized. However, it does not explicitly say when not to use it or name alternatives such as google_ads_generate_keyword_ideas, even though sibling tools make those alternatives obvious.

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