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

The description discloses key behavioral details: token input creates a session-only login, no args returns a login link, and permanent login should be handled via config rather than this tool. Any hits idempotent flag without contradiction; no destructive readOnly conflicts appear.

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 dense but not overly long, containing essential setup and invocation details. The flow from login in the browser, to config recommendation, to session-only call is logical and useful, though the opening audience phrase adds a little non-essential context.

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 low-complexity tool with one optional parameter and no output schema, the description covers the main invocation cases and their outcomes reasonably well. It leaves some detail implicit, such as exact return format or the meaning of 'link', but gives enough for an agent to call the tool correctly in typical workflows.

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 provides only a bare optional string token with 0% description coverage, so the description fully carries the burden. It explains the token is a JWT, how it is obtained, what it does when passed, and the meaning of omitting it—making the parameter semantics completely 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 states that this tool is for authenticating with MCP.AI for IDE agents, explaining that it can either produce a login link or accept a pasted JWT. It is more detailed and actionable than just 'authenticate', but it does not explicitly distinguish itself from the sibling tool 'connect'.

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?

It gives explicit usage guidance: prefer server config for a permanent non-expiring connection, use the tool for session-only login, and use either the token or no-args form depending on whether the user pasted a token. It does not name alternatives explicitly, but the permanent-vs-session distinction is a clear when-to-use guide.

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