ga4_create_expanded_data_set

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

No annotations are provided, so the description must fully disclose behavior. It states it is a write operation and requires confirm=true, but it does not mention what happens upon creation (e.g., return value, idempotency, side effects, rate limits, or permissions beyond GA4 360). This is a significant gap for a mutation tool.

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 a single sentence that front-loads the purpose and flags. It is concise with no wasted words, though the '[GA4 WRITE]' tag is somewhat redundant. It earns a 4 because it is efficient but could be slightly more structured.

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 the tool's complexity (5 params, nested body, no output schema), the description covers the essential creation context and prerequisites but omits the return value or any post-creation behavior. It is adequate but not fully complete for an agent to confidently use without additional inference.

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 coverage is 60% (3 of 5 params have descriptions). The description adds value for the 'body' parameter by specifying which fields to pass (dimensionNames, metricNames, dimensionFilterExpression), but does not elaborate on 'description' or 'displayName'. The extra info is helpful but not extensive, so a score of 3 is appropriate.

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 verb 'Create' and the resource 'expanded data set (GA4 360 only)', distinguishing it from sibling tools like update and delete. The purpose is immediately clear.

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 requirements (GA4 360 only, GA4_MCP_ENABLE_WRITES=true, confirm=true) but does not provide guidance on when to use this tool vs alternatives (e.g., update, or other create tools). No explicit when-not or alternative references.

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