ga4_create_channel_group

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

With no annotations provided, the description must cover behavioral traits. It indicates a write operation via '[GA4 WRITE]' and notes the need for confirm=true. However, it lacks details on side effects, idempotency, or return values.

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 extremely concise: two sentences that front-load the purpose and key constraints. No unnecessary words.

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 complexity (5 parameters, nested object, no output schema), the description covers the essential aspects: what it does, prerequisites, and how to pass grouping rules. It lacks details on return values or error conditions but is mostly adequate.

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 parameters have descriptions), but the tool description adds value by explaining that the body parameter should contain 'groupingRule[]'. This clarifies usage beyond the schema definition.

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 '[GA4 WRITE] Create a custom channel group.' which specifies the verb 'Create' and the resource 'custom channel group'. It distinguishes from sibling tools like ga4_update_channel_group and ga4_delete_channel_group.

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 prerequisites ('Requires GA4_MCP_ENABLE_WRITES=true and confirm=true') and hints at usage ('Pass groupingRule[] via `body`'). However, it does not explicitly state when to use this tool versus other GA4 create tools or provide exclusions.

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