ga4_update_google_ads_link

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 indicates this is a write operation, explains the automatic derivation of updateMask, and states required conditions. It does not detail error handling or exact response, but covers key behavioral traits.

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 sentences: the first delivers the core purpose and key parameter guidance, the second adds required conditions. No redundant words, front-loaded effectively.

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 no annotations and no output schema, the description explains the update behavior, updateMask derivation, and prerequisites. It could mention return value or error cases, but the essential information is present.

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 75% (3 of 4 parameters described). The description adds meaning for the adsPersonalizationEnabled parameter by linking it to 'personalized advertising flag', and explains the optional updateMask's derivation behavior. This compensates for the missing schema description of one parameter.

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 starts with '[GA4 WRITE]' and states 'Update a Google Ads link (personalized advertising flag)', which clearly identifies the action (update) the resource (Google Ads link) and the specific field (personalized advertising flag). This distinguishes it from sibling tools like create, delete, and list.

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 explains how to use the tool: 'Pass only the fields to change; updateMask is derived from them' and specifies required conditions: 'Requires GA4_MCP_ENABLE_WRITES=true and confirm=true'. However, it does not explicitly state when not to use this tool or provide direct alternatives among siblings.

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