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

Annotations already signal idempotent and non-destructive behavior, so the description adds value by explaining the permanent versus session-only login distinction and the non-expiring nature of the config-based approach. It also clarifies that a pasted token is only for the current session. It does not disclose return format, but the annotations lower the burden.

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 front-loaded with the tool's purpose and then gives actionable instructions. Every sentence contributes useful information, but the structure is somewhat run-on with multiple instructions packed together. Still, it is appropriately sized and not bloated.

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 simple schema (one optional string parameter), no output schema, and sparse annotations, the description covers the essential context: what the tool does, how to authenticate, and the two token-handling modes. It lacks details about the exact return value or error behavior, but for a low-complexity auth tool, the description is mostly complete.

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?

With zero schema description coverage, the description fully compensates by explaining the sole 'token' parameter: it should be a JWT pasted by the user, and passing it enables session-only authentication. It also explains the no-argument behavior, which is valuable because the parameter is optional. This is strong parameter-level guidance.

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 authenticates the user to MCP.AI for IDE agents via a browser login and access token. It names the specific action (log in/authenticate) and resource, and distinguishes session-only from permanent config usage. However, it does not explicitly differentiate itself from the sibling tool 'connect', so it falls short of a 5.

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 clear context for two usage modes: adding the token to server config for permanent access, or passing it in the call for session-only login. It also explains that calling with no arguments returns the login link. It does not provide explicit when-not-to-use guidance or mention alternative sibling tools, so it is not a full 5.

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