get_pixel_charts

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

No annotations are provided, so the description carries the full burden of behavioral disclosure, but it says nothing about authentication requirements, whether data is read-only, default time range, timezone behavior, or return shape. 'Get' implies a read operation, but the description does not confirm or expand on this.

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 front-loaded sentence with no filler. It is concise, though its brevity is also the source of the specification gaps covered in other dimensions.

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?

With no output schema, no annotations, and 0% parameter description coverage, the description is too sparse for a tool with four parameters. It does not describe what chart data is returned, how the date range is interpreted, or how timezone affects results — all essential for correct invocation.

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 0%, so the description must compensate, but it only mentions the 20-pixel limit, which is already encoded in maxItems. It provides no meaning for startAt/endAt (e.g., epoch vs. ISO date, inclusive/exclusive, defaults) or timezone, leaving three optional parameters completely undocumented.

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?

States a specific verb ('Get') and resource ('chart data ... tracking pixels'), and the 20-pixel cap is useful. However, 'chart data' is vague — it doesn't say which metrics or dimensions are returned. It only implicitly distinguishes itself from siblings like get_pixel and get_link_charts through the resource name, without naming alternatives.

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?

No guidance on when to call this versus get_pixel, get_link_charts, or other chart tools is provided. There is no mention of prerequisites, exclusions, or typical use cases, leaving the agent to infer intent entirely from the name.

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