pick_color_to_clipboard

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

The description is consistent with annotations: readOnlyHint=false because it writes the clipboard, destructiveHint=false because the picker itself is harmless. It adds what gets written (the hex value) but not that existing clipboard contents are overwritten, nor that the operation is interactive and may block waiting for a screen selection.

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?

A single front-loaded sentence with a clear verb, source, and destination. No filler 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?

There is no output schema, so the description should say whether the hex value is also returned or only placed on the clipboard, and whether the call is interactive/blocking. For a trivially simple tool this is a modest gap rather than a blocking one.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The description correctly implies the operation is parameterless and driven by on-screen interaction.

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 action (pick color from screen) and its side effect (copy hex to clipboard), which is more than the bare name conveys. It partially distinguishes itself from the sibling pick_color by naming the clipboard write, but never explicitly contrasts the two.

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?

Usage is only implied – an agent can infer this is the variant that puts the result on the clipboard. There is no explicit when-to-use versus pick_color, and no statement of prerequisites such as needing an interactive user click or a display server.

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