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

Beyond the annotations, the description reveals the browser login flow, that no-args yields a link, that passing a token creates a session-only login, and that permanent non-expiring auth is best done via config. It does not mention failure/error behavior or what the token-return boundary state is, but the annotations do not contradict the text.

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 text is compact and structured around the two login paths: permanent config and session-only token. It stays efficient and front-loaded, though the opening phrase `MCP.AI for IDE agents (Cursor, etc.)` is slightly redundant and adds some brand/context noise.

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-optional-parameter tool, the description covers the important flows: obtaining the login link, receiving a JWT from the user, and passing the token for a session-only login. It does not describe the returned login link's shape or failure modes, but the basic usage is complete enough for an agent to act.

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 says `token` is a string with no description. The description fully compensates: it tells the agent the token is a JWT pasted by the user after browser login, and that omitting the token returns a login link. That is clear meaning beyond the schema.

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 identifies the tool as an authentication flow: log in the browser, copy the access token, and either configure a permanent header or pass a JWT for a session-only login. It is specific but does not explicitly differentiate from sibling tools such as connect, so it lacks a clear sibling distinction.

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 gives explicit usage guidance: permanent auth belongs in server config as an Authorization header, session-only auth uses the token parameter, and no-args returns the login link. This is a clear when/when-not recommendation with an explicit permanent-vs-session decision.

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