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

The description adds valuable behavioral context beyond annotations: it explains the browser-based login flow, tells the agent that a config header is non-expiring, and clarifies that session-only login requires pasting a token. It also notes the no-args invocation returns the link. No contradiction with idempotentHint=true.

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 compact and front-loaded. Each sentence adds necessary information: what the tool is for, how to set up permanent auth, and how to perform session-only login. No unnecessary repetition or filler.

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 one-parameter tool with no output schema, the description covers invocation modes and the intended workflow well. The main gap is that it does not describe what the tool returns when a token is provided, only that no-args returns the login link.

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 input schema only defines an optional string 'token' with no description. The description compensates by explaining that the token is a JWT to paste for session-only login and that omitting the token fetches the login link. It does not explain the token's format or where to obtain it in detail, but provides sufficient meaning for the single parameter.

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's action: authenticating by logging in through the browser, obtaining an access token, and either configuring it for permanent use or passing it as a JWT for session-only login. It differentiates itself from siblings by focusing on authentication and token exchange.

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?

Explicitly distinguishes between permanent setup via server config header and session-only usage by pasting a token. It also provides clear call patterns: with no args to get the login link, or with { token: "<jwt>" } after the user pastes the token.

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