ga4_traffic_sources

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

No annotations are provided, so the description bears full responsibility for disclosing behavioral traits. It states that it retrieves traffic sources grouped by channel and source/medium, but does not mention whether it is read-only, whether any side effects occur, or how the data is returned (e.g., pagination, limiting). This is a minimal read-like tool, but the description offers no explicit safety or mutation info.

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 a single sentence with zero filler, front-loading the exact purpose. Every word earns its place, and it is immediately scannable.

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 report tool, the description is adequate but not complete. It does not describe the output format or metrics, and with no output schema, an agent cannot predict the result structure. Given the number of GA4 sibling tools, a bit more context on what differentiates this output (e.g., 'returns sessions and users by channel') would improve completeness.

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 schema already describes three of four parameters (75% coverage), including date format and property format; the description adds nothing about parameters. The only undocumented parameter, limit, is not explained in the description either. Since the schema does the heavy lifting, the description remains at baseline without enhancing understanding.

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 'GA4 traffic sources by default channel group and source/medium' names a specific resource (GA4 traffic sources) and specifies the grouping dimensions, clearly distinguishing it from sibling tools like ga4_top_pages or ga4_landing_pages. It could be slightly more explicit about what metrics are returned, but the core purpose is unambiguous.

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?

There is no guidance on when to use this tool versus alternatives such as ga4_run_report or ga4_landing_pages. The description states only what the tool does, not the context in which it should be selected, nor any exclusions or prerequisites. An agent must infer usage from the name alone.

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