ga4_traffic_by_channel

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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint false. The description adds minimal behavioral context beyond being a convenience wrapper, such as potential limitations compared to ga4_run_report. With strong annotations, the description adds some but not substantial transparency.

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 two short sentences, front-loading the key metrics and purpose. Every sentence is essential, with no fluff or redundancy.

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 low complexity (3 optional parameters, strong annotations, no output schema), the description covers the core purpose and relationship to a sibling. It could include more on output format or default channel groups, but overall it provides sufficient context for a quick analytics tool.

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 coverage is 100%, with each parameter (days, limit, property_id) having descriptions. The description mentions 'last N days' which aligns with the days parameter but adds no new semantic meaning beyond what the schema provides. Baseline 3 is appropriate.

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 retrieves sessions, engaged sessions, and conversions broken down by default channel group over a specified period. It also notes it separates organic from paid/referral/direct and positions itself as a convenience wrapper over ga4_run_report, distinguishing it from siblings.

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 implies usage for quick channel breakdowns and mentions it's a convenience wrapper over ga4_run_report, but does not explicitly state when to use this tool vs alternatives like ga4_organic_search_overview or ga4_top_landing_pages. Lacks explicit when-not or alternative guidance.

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