ga4_datastream_create

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

No annotations provided, so description carries the burden. It discloses the return value (Measurement ID/tag) which is useful. However, it does not mention whether the operation is idempotent, destructive, or if it requires specific permissions. Missing some behavioral details expected for a create operation.

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?

Single sentence that efficiently communicates purpose and key output. No unnecessary words, front-loaded with the action, and structured well.

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 3-param create tool with no output schema and no annotations, the description covers core purpose and result. Missing prerequisites (e.g., property must exist), error conditions, and whether duplicate creation is allowed. Adequate but has gaps.

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 low (33%), only default_uri has a description. The tool description does not provide additional details about property_id or display_name beyond their names. The parameter meanings are partially inferred but not explicitly clarified. More explanation would help.

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?

Clearly states 'create a WEB data stream' and specifies the result (returns Measurement ID/tag). The verb 'create' and resource 'WEB data stream' are distinct from sibling tools that get or list streams.

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?

Explicitly says 'create a WEB data stream', implying it is the tool for GA4 web data stream creation. Does not explicitly state when not to use or provide alternatives, but the context of sibling names makes differentiation clear.

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