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

Goes meaningfully beyond annotations by dictating secret handling (poll_secret must not be shown to the user) and clarifying that the bind path does not replace mcp_token. It never explains what the destructiveHint=true annotation implies for this call, which leaves a small gap given the write-ish annotation profile.

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?

Four short sentences, front-loaded with the action and then the operational rules; no filler. The final sentence is dense and slightly ambiguous in its phrasing about binding without replacing the token.

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?

No output schema exists, so the description correctly names the return fields (verification_uri, user_code, poll_secret) and the follow-up polling step. It omits expiration/timeout behavior and error cases for a login flow, which would round it out.

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 one parameter at 100% schema coverage, the schema already carries the meaning. The description's guidance on link_mcp_token ('on a Google session to bind Gate UID without replacing mcp_token') reinforces the schema but adds little that isn't already documented.

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?

Specific verb plus resource ('Start Gate device login') with a clear scope, and 'Start' naturally pairs against the sibling dex_auth_gate_login_poll. It stops short of naming that sibling explicitly, so an agent must infer the two-step flow.

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?

Gives concrete operating context: show verification_uri and user_code, retain poll_secret, and pass link_mcp_token only on a Google session. The alternative ('omit for standalone Gate login') is stated in the schema but the description still doesn't say to call the poll tool next.

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