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

Annotations indicate idempotentHint=true and destructiveHint=false, and the description adds meaningful behavioral context: no-args returns a login link, passing a token establishes a session, and config-based tokens result in a non-expiring connection. It does not contradict the annotations and provides useful details about the two auth modes, though it could clarify session expiration or side effects of pasting a token.

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 informative and reasonably compact, front-loading the purpose and then presenting the two authentication options. It could be slightly more structured (e.g., bullet points for the two modes), but every sentence contributes useful information and there is no fluff.

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?

Given the tool's auth-flow complexity and lack of output schema, the description covers the key scenarios: permanent config-based auth, session-only token login, and obtaining the login link. It explains enough for an agent to invoke the tool correctly, though it does not explicitly describe the response format or error cases, which are secondary 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?

Schema coverage is 0% with one optional token parameter, and the description compensates well by explaining the token is a JWT copied from the browser and used for session-only login. It also clarifies that omitting the token yields the login link. Minor gap: no detail on token validation or failure behavior, but the parameter meaning is clearly conveyed.

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 purpose: authenticating to MCP.AI for IDE agents by logging in via browser and obtaining an access token. It specifies the resource (this server's auth), the action (authenticate), and distinguishes between token configuration and session-only token submission. This effectively separates it from siblings like connect and marketplace.

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: prefer adding the token to the server's config for a permanent connection, or pass it as a JWT for session-only login, or call with no args to get the login link. It clearly explains when to invoke each mode, which is strong contextual guidance for an AI agent.

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