ga4_update_data_stream

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It correctly marks the tool as a write operation with '[GA4 WRITE]', warns about forbidden fields, and explains updateMask derivation. It does not cover rate limits or detailed auth scopes, but the core mutation behavior is transparent.

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 concise, front-loading the critical purpose and constraints. Every sentence serves a distinct purpose, though the density could be slightly improved by breaking into shorter points. Still, it avoids unnecessary words effectively.

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?

Considering the tool's complexity (6 parameters, no output schema), the description adequately covers functionality, restrictions, and prerequisites. It does not describe the return value, but for an update tool this is typically standard. Overall, it is sufficiently complete for an AI agent.

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 description adds meaning beyond the high-coverage schema (83%) by clarifying that displayName and defaultUri are the only allowed field changes and that updateMask is derived from supplied fields unless overridden for nested paths. This guides correct usage of parameters together.

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 tool updates a GA4 data stream and explicitly lists the only modifiable fields ('displayName and (web) defaultUri ONLY'). This specificity distinguishes it from sibling tools and immediately conveys its purpose.

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 provides explicit when-not-to-use guidance by categorizing other settings as Google tag settings with no API fields, directing users to the manual UI. It also lists required prerequisites (GA4_MCP_ENABLE_WRITES=true and confirm=true), giving clear action criteria.

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