ga4_create_key_event

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

Annotations already declare readOnlyHint=false, destructiveHint=true and openWorldHint=true, so the description carries a lighter burden, yet it adds nothing beyond them: no mention of reversibility, idempotency, or what the 'confirm' flag actually gates. Nothing in the text contradicts the annotations, but a mutation tool with a destructive hint and an unexplained confirm gate deserves more behavioral disclosure.

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?

A single front-loaded sentence with no filler and no repetition of the tool name. It is efficient; the shortfall is missing content rather than wasted content.

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?

An output schema exists so return values need no explanation, but for a destructive write with three undocumented parameters and a non-trivial 'confirm' flag, the description omits what an agent needs to invoke it safely.

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 0% across three parameters, so the description must compensate. It gives useful example event names ('generate_lead', 'purchase'), but never explains property_id format or, more critically, what the boolean 'confirm' parameter does, even though it defaults to false and likely gates the mutation.

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 states a specific verb ('Mark ... as a key event') and resource, and immediately clarifies the domain concept with '(conversion) in GA4'. No sibling tool in the list operates on key events, so an agent can route to it unambiguously.

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?

There is no explicit when-to-use, when-not-to-use, or prerequisite context (e.g. required permissions, whether the event must already exist). Usage is only implied by the one-line purpose statement.

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