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

The description discloses key behaviors: it initiates a browser login, requires a token, and offers a non-expiring vs session-only option. It mentions that calling with no args gets a link, which is useful. Annotations indicate idempotentHint=true, which aligns with the description's re-callable nature. No contradiction.

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 concise, with two sentences that pack a lot of information: target audience, login method, configuration option, session-only alternative, and invocation patterns. No fluff, every phrase earns its place.

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 authentication tool with one optional parameter and no output schema, the description covers the essential behavior: how to obtain the token, how to use it, and the difference between permanent and session connections. It doesn't explain error handling or response format, but given the simplicity, it's sufficiently 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?

The schema provides a single optional 'token' parameter with no description (0% coverage). The description compensates by explaining that 'token' is the JWT to paste, and that omitting it gets a link. This adds value, but it could be more explicit about the token format and what happens if an invalid token is provided. Baseline 3 is appropriate.

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: to authenticate users for MCP.AI via browser login and token capture. It explicitly mentions the target audience (IDE agents) and the resource (MCP.AI). However, it does not explicitly distinguish it from sibling tools like 'connect', though 'connect' is likely different.

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 provides clear usage context: when to use this tool (to log in and authenticate) and how to use it (paste token or get link). It also gives alternatives (adding token to config for permanent connection vs session-only login). It does not explicitly say when NOT to use it, but the context is clear enough.

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