Set workers.dev Serving

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

Annotations already establish mutating, idempotent, and non-destructive behavior. The description adds the functional behavior of toggling serving and optionally enabling preview URLs, which is useful context. It does not disclose consequences like immediate traffic impact, but the core action is clearly conveyed.

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, well-structured sentence that front-loads the primary action and mentions the optional previews feature. Every word earns its place, with no redundancy or filler.

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 three-parameter tool with clear annotations, the description covers the main function and the optional previews behavior. It does not explain return values or edge cases, but the tool's simplicity and the schema's completeness make this sufficient.

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 documents all three parameters with descriptions (100% coverage), so the description does not need to add parameter details. The tool description does not go beyond the schema, matching the baseline score of 3.

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 uses specific verbs ('Enable or disable') and identifies the exact resource (serving a Worker on its <script_name>.<account>.workers.dev subdomain). It also mentions the optional previews feature, clearly distinguishing it from sibling tools like deploy_worker or rollback_worker.

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 by stating what the tool does, but it does not explicitly say when to use it versus alternatives or mention any exclusions. The context is clear enough for a simple toggle, but there is no direct guidance or reference to related tools.

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