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

Annotations already declare destructiveHint=true and openWorldHint=true, so the safety bar is lower, but the description adds nothing beyond them. It does not say which action is destructive (delete), whether disconnect is reversible, whether a custom domain needs verification, or that exposing the agent publicly has security implications.

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 front-loaded sentence with no wasted words. It is concise, but the brevity comes at the cost of the detail needed for a five-action tool.

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 destructive, open-world tool with five enum actions, a free-form nested params object, and no output schema, this description is far too thin. It leaves action semantics, parameter shapes, and side effects entirely undocumented.

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 description coverage is 0% and the 'params' property is an untyped nested object with no documented shape. The description supplies zero information about what params each action expects, so a caller cannot construct a valid connect or verify call from the definition alone.

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 verb 'Expose' and the resources (tunnel.handoff.lol, custom domains) make the overall intent clear, but the description covers only the 'connect' style of operation. It never mentions that the tool also handles status, verify, disconnect, and delete, so an agent cannot map the five action values to purposes from this text.

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?

There is no when-to-use guidance, no exclusions, and no mention of the sibling tools (core_comm, core_realtime, etc.) that might be alternatives for connectivity. The only implicit cue is that this is for public exposure, which a caller must infer.

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