ga4_set_default

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

No annotations are provided, so the description must carry the behavioral burden. It discloses that the tool sets a default property used by other calls, which is meaningful beyond the schema. However, it omits permissions, persistence scope, whether it overwrites a prior default, and reversibility, which are important for a configuration mutation.

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 front-loaded sentence with no wasted words. It states the action and the condition of its effect immediately.

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?

For a simple one-parameter configuration tool, the description covers the core action and its downstream effect. Given no annotations and no output schema, it should also mention how to obtain a valid saved property name or what happens on invalid input, but those gaps are not severe.

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 schema already documents the single parameter as 'Saved property name' with 100% coverage. The description reinforces that the name refers to a saved GA4 property and becomes the default, but it adds no format, source, or validation details beyond the schema.

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 uses a specific verb ('Choose') and resource ('saved GA4 property') and explains the effect: tools use that property when a call names none. This clearly distinguishes it from sibling tools such as ga4_list_properties or ga4_configure.

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 gives a clear condition for the tool's effect: it applies when a call does not name a property. It does not explicitly state when to choose this tool versus alternatives or whether it should be run before report tools, but the context is strong enough for an agent to infer usage.

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