hue_auth

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

With no annotations, the description carries the behavioral disclosure burden and does a good job: it states that calling the tool opens a browser window and starts an OAuth authorization flow. It does not detail that the call may block waiting for user interaction or what the return value is, but the core side effect is transparent.

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 three short sentences with no filler. The purpose is front-loaded in the first sentence, and each subsequent sentence adds useful timing or behavioral context.

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 zero-parameter auth tool with no output schema, the description covers what it does, when it is needed, and the main observable side effect. It could mention that completion depends on the user finishing the browser authorization, but it is otherwise complete enough to invoke correctly.

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 has zero parameters, so there is no parameter detail to add; per the rubric this is a baseline 4. The description's focus on the auth flow is sufficient since the input schema is empty.

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 opens with 'Start the Philips Hue OAuth authorization flow,' which is a specific verb plus resource. It clearly identifies the tool's role as authorizing access to Hue lights, and this is distinct from the sibling tools that perform light control or profile operations.

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?

It explicitly scopes when the tool is needed: 'Only needed on first use or when tokens expire.' This tells an agent not to call it on every request and effectively distinguishes it from the other Hue API tools that are used for ongoing operations.

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