ga4_create_key_event

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

No annotations exist, so the description must disclose behavioral traits. It only states it's a write operation and requires confirm. It fails to mention side effects, permissions, rate limits, or the impact on the GA4 property (e.g., a new key event appears in reports).

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 with one sentence and a requirement note. No wasted words, front-loaded with the action and constraint.

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?

Despite having 5 parameters and no output schema, the description is too minimal. It does not explain what a key event is, the role of countingMethod, or the consequences of creation. Agents lack context to use 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?

Schema coverage is 100%, so the description does not add extra meaning. The schema already describes all parameters, including the raw body field. Baseline 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 action: 'Create a key event (conversion) on a GA4 property.' It uses a specific verb and resource, and differentiates from siblings like ga4_update_key_event by the verb 'create'.

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 notes prerequisites (GA4_MCP_ENABLE_WRITES=true and confirm=true) but does not provide guidance on when to use this tool versus alternatives (e.g., ga4_update_key_event). It implies usage for creating new key events only.

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