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

Beyond the annotations, it discloses the browser login flow, the permanent/non-expiring nature of the config-header option, the session-only nature of the token paste, and the no-args link behavior. This is rich behavioral context and does not contradict the annotations.

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 information-dense, front-loaded with the tool's purpose and audience. It is slightly run-on, but every clause contributes useful guidance.

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 tool with one optional parameter and no output schema, the description covers permanent and session modes, invocation patterns, and the no-arg link behavior. It does not describe response/error details, but those are not essential here.

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 schema only declares token as an optional string, so the description compensates by explaining that token is a pasted JWT/access token and by showing call shapes with and without it. It could mention invalid-token behavior, but the meaning of the only parameter is clear.

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 names the authentication action for MCP.AI IDE agents and explains the browser login/token flow. It does not explicitly contrast with the 'connect' sibling tool, so sibling differentiation is only implicit.

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 explicitly distinguishes usage modes: a permanent config-header approach versus a session-only token paste, and states that no args returns the login link. This gives the agent concrete when-to-use guidance and alternatives within the tool.

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