set_dev_url

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

Annotations already declare openWorldHint=true, idempotentHint=true and readOnlyHint=false, so the agent knows this reconfigures an external connection safely and repeatably. The description adds one genuinely useful behavioral fact not in the annotations: that remote mode forbids source code changes. It still omits what happens to the previous target and whether the connection re-establishes.

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?

Three short sentences, tag first, purpose second, constraint third, with no filler. Slightly more efficient framing (tagging plus restating 'devtools server') would be tighter, but nothing is wasted.

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 one-parameter configuration tool with clear annotations and no output schema, the description covers enough to invoke it correctly. It is thin on the connection lifecycle, though, and never cross-references set_dev_port, the sibling an agent would most plausibly confuse it with.

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?

Schema coverage is 100% and the single url parameter is documented in the schema with an example, so the description need not restate it. "By URL" adds nothing beyond the schema's "Full URL, e.g. https://my-app.vercel.app", which is the expected baseline when the schema does the heavy lifting.

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 pairs a clear action with a resource: it configures the devtools server connection so a remote Three.js app can be inspected by URL. An agent can tell it is the targeting/setup tool rather than an inspection tool. It does not, however, distinguish itself from the very close sibling set_dev_port, which the agent must infer is a different configuration axis.

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?

"Inspect a remote Three.js app by URL" implies the use case (switching the bridge to a remote target), and the remote-mode caveat hints at a limit. But there is no explicit when-to-use versus set_dev_port or bridge_status, and no statement of prerequisites such as the bridge needing to be running.

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