ga4_user_journey

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

No annotations are provided, so the description carries the full burden. It discloses the fallback to empty rows if the prerequisite is not met and mentions default dates. However, it does not describe whether the operation is read-only, any authentication requirements, or rate limits. The presence of an output schema partially mitigates the lack of output description.

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 extremely concise (≈60 words) and well-structured: a single sentence summary followed by a bulleted Args list. Every sentence adds value, with no redundant or unnecessary information.

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?

Given the output schema exists (per context signals), the description does not need to explain return values. It covers the prerequisite, fallback, and parameter details. It could be slightly improved by clarifying the timeline ordering (e.g., chronological), but overall it is sufficiently complete for a tool with a dependent output schema.

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?

With 0% schema description coverage, the description fully compensates by listing each parameter (client_id, start_date, end_date, limit) with clear explanations: 'GA4 clientId value to filter on', date formats (YYYY-MM-DD) with explicit defaults (28 days ago, today, 100). This adds substantial meaning beyond the bare 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 clearly states the tool creates a 'best-effort event timeline for a single user.' The verb 'timeline' and the resource 'events for a single user' are specific. It also distinguishes itself from other GA4 tools by focusing on individual user-level tracking with a required clientId, making its purpose distinct.

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 context about the prerequisite (user-scoped clientId custom dimension) and fallback behavior, but it does not explicitly state when to use this tool versus similar GA4 tools like ga4_report or ga4_event_breakdown. No alternatives or when-not scenarios are mentioned.

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