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

The description only says 'returns' a URL, giving no indication of side effects. The annotations include destructiveHint=true and idempotentHint=false, but the description does not disclose any state-changing behavior, such as invalidating existing sessions or starting an auth session. This is a significant transparency gap given the destructive hint.

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, focused sentence that earns its place. It is not overly verbose. However, it is quite sparse, missing contextual details that would make it fully effective, so it doesn't earn a 5.

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?

The tool is part of a multi-step OAuth flow (start, poll), but the description does not mention the next step or that the returned URL is meant for a user to visit. There is no output schema, so the description should explain the return value and flow, but it only gives a minimal phrase. The destructive and open-world hints also go unaddressed, making the description inadequate for an agent to fully use the tool correctly.

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 tool has zero parameters, so the description does not need to explain parameter semantics. Baseline for 0 params is 4; no additional information is required or expected.

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 tool returns a browser verification URL for Google device OAuth, with a specific verb and resource. It distinctly differentiates this from sibling tools like dex_auth_google_login_poll, which is the polling step.

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 this is the start of the Google device OAuth flow, but it does not explicitly state when to use it, what to do after receiving the URL, or mention the polling alternative. The context is inferred from the tool name and sibling tools, not from clear guidance.

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