Set brightness

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

The description confirms a write operation (consistent with readOnlyHint=false), but does not disclose side effects, persistence, or prerequisites beyond the schema. The annotation already covers the non-read-only aspect, and the description adds the absolute scale but little else.

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 sentence that front-loads the action and object, with no unnecessary words. It is appropriately concise for a simple setter.

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?

The description is adequate for a simple setter, covering the operation and range. Without an output schema, it doesn't explain the return value, but the device parameter's schema description ties into list_devices, providing contextual completeness. Minor gaps on prerequisites or return expectations keep it from a perfect score.

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 input schema fully describes both parameters ('value' with range, 'device' with reference to list_devices). The description adds the term 'absolute', clarifying that the value is not relative, which is a useful extension beyond the schema's basic range.

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 action ('Set'), the resource ('overall brightness of a Twinkly device'), and the range ('0 to 100'), distinguishing it from sibling tools like set_power or set_effect.

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 setting absolute brightness, but provides no explicit guidance on when to use this tool versus alternatives or any exclusions. The 'absolute level' wording hints at a key semantic, but no alternatives are mentioned.

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