ga4_data_streams

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

With no annotations supplied, the description carries the disclosure burden and does so for the two riskiest aspects: the required API enablement on the quota project and the Viewer role on the GA4 property. It also discloses failure behavior (errors explain how to fix access problems). It stops short of stating that this is a pure read with no side effects or how results are returned/ordered.

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?

Purpose comes first, followed by prerequisites and failure handling, which is sensible front-loading in three compact clauses. Minor blemish: the prerequisites sentence is partly in Spanish ('Lector (Viewer) en la propiedad de GA4'), an inconsistent-language fragment inside an otherwise English description.

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-optional-parameter read tool with no output schema, the description covers purpose, prerequisites, and failure recovery adequately. It is nonetheless incomplete on the optionality/default of the property argument and on whether all streams are returned in one call, both of which an agent needs to call 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?

The single parameter is fully documented in the schema (saved property name, see ga4_list_properties, defaults to the default property), so the description adds nothing about it. Worse, it omits the default-property behavior, meaning an agent reading only the prose would not know the parameter is optional and falls back to a default.

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 names the resource precisely ('Data streams of the property') and enumerates the concrete variants and identifying fields the agent will see (Android app, iOS app, website / package name, bundle id, URL). It is unmistakable against siblings like ga4_firebase_apps or ga4_property_details, though it uses a noun phrase rather than an explicit verb (list/get).

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?

It gives prerequisites and points to ga4_check_access as the one-shot diagnostic when access fails, which is useful routing. It never states when to call this versus related siblings such as ga4_firebase_apps or ga4_property_details, so the usage guidance is implied rather than explicit.

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