set_dev_url

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

The description reveals important behavioral traits beyond annotations: it clarifies that source code changes are impossible in remote mode, only runtime/visual modifications. This aligns with idempotentHint and openWorldHint. No contradiction with annotations.

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 extremely concise with two sentences. The first sentence front-loads the purpose, and the second adds critical limitation. No wasted words.

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 tool with one parameter and no output schema, the description is complete enough. It covers purpose and behavioral constraints. Minor improvement could be mentioning that it switches from local to remote mode, but not necessary.

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?

With 100% schema description coverage, the baseline is 3. The description adds value by providing examples of valid URLs and clarifying that it expects a full URL, enhancing the agent's understanding beyond the schema definition.

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 verb 'Connect' and the resource 'remote Three.js app', specifying the action as connecting via URL for inspection and visual debugging. It distinguishes from siblings like set_dev_port (which likely sets a local port) by explicitly mentioning remote mode.

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 provides a clear context for usage (remote Three.js app inspection) and a key limitation ('Source code changes are NOT possible in remote mode'). While it doesn't explicitly state when not to use it or name alternative tools, the context is sufficient for an agent to decide when to invoke this tool.

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