ga4_create_expanded_data_set

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

The description indicates this is a write operation ([GA4 WRITE]) and requires confirmation, implying a safety mechanism. However, it does not disclose potential side effects, limits, or error conditions. Since no annotations are provided, the description carries the burden but fails to be fully transparent.

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, front-loading the purpose and then providing key configuration requirements. Every word is informative and there is no redundancy.

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?

Given no output schema and 5 parameters with a nested body object, the description covers essential usage aspects but omits expected return value, idempotency, and error handling. It is sufficient for basic use but not comprehensive.

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 description adds meaning by specifying that dimensionNames/metricNames/dimensionFilterExpression should be passed in the body parameter, which is not clear from the schema alone. For other parameters (confirm, property, description, displayName), no additional context is given. With 60% schema coverage, the description provides moderate added value.

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 creates an expanded data set, specifying it is GA4 360 only. It identifies the key parameters to pass via body (dimensionNames/metricNames/dimensionFilterExpression). This is specific and distinguishes from generic create tools.

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 mentions required configuration (GA4_MCP_ENABLE_WRITES=true and confirm=true) but does not provide guidance on when to use this tool versus other GA4 create tools like ga4_create_audience. No alternatives are mentioned.

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