set_theme_cf_colors

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

No annotations are provided, so the description bears the burden of behavioral disclosure. It mentions the prerequisite of generate_theme and the minimum-input constraint, but does not describe side effects like overwriting existing stops, validation of hex values, or whether changes are destructive. The operational guardrail is helpful, but richer context (e.g., effect on unset stops) would improve 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?

Two sentences, front-loaded with the main purpose, and no wasted words. The structure efficiently conveys the target, the parameter group, and the prerequisite.

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 setter with no output schema, the description covers essential context: what it does, the parameter semantics, and a prerequisite. It doesn't mention exact hex format or error handling, but the schema and sibling context fill those gaps modestly. Overall, it is adequately complete for guided 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 descriptions already cover each parameter as 'hex', giving 80% coverage. The description adds value by clarifying that every parameter is a hex color and that at least one must be supplied, which is not apparent from individual defaults. It also maps 'null' to the 'nul' parameter, aiding correct invocation.

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's function: setting the report theme's conditional-formatting gradient stops, and identifies the specific resource (report theme) and scope (CF gradient stops). It distinguishes from sibling tools by naming the exact CF aspect, unlike set_theme_data_colors or set_theme_structural_colors.

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?

Provides a clear prerequisite ('Run generate_theme first') and states the requirement to supply at least one color. While it doesn't explicitly compare to alternatives, the context is enough to understand when to use it. Sibling theme setter tools exist, but the description's specificity helps differentiate usage.

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