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

It discloses the key behavioral aspects: the tool can return a login link, accept a pasted JWT, and that session-only login expires. Annotations already indicate idempotent and non-read-only, so the description adds value by explaining the session vs. permanent header distinction. It doesn't cover failure modes or token validity, but the primary side effects are transparent.

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 clear but somewhat meandering, combining a product intro ('MCP.AI for IDE agents'), instructions for the user, and commands for the agent in a single block. It's under 80 words and mostly front-loaded, but it could be better organized into a short 'how to use' list. Overall, adequate but not as crisp as it could be.

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 tool with two input modes, no output schema, and auth implications, the description covers both invocation patterns (no-arg and token), the meaning of the return (link vs. success), and the distinction from persistent configuration. It omits details like response format or expiration, but these are less fundamental for an agent to invoke the tool correctly. The guidance is 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 input schema has one optional token parameter with no description (0% schema coverage). The description explicitly defines its meaning: pass {"token": "<jwt>"} after the user pastes it, or omit the argument to receive the login link. This fully compensates for the bare schema, giving the agent exact usage instructions for both modes.

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 handles authentication for an MCP.AI server in IDE agents, explaining the login flow (browser, token paste, session). It distinguishes itself from siblings through its action-focused phrasing ('log in', 'access token'), though it doesn't explicitly name a sibling alternative. The resource is specific: the MCP.AI server connection.

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 explicit when-to-call guidance: with no args to get the login link and with a token to complete authentication. It also contrasts with a configuration-based approach for permanent access, which helps the agent choose between a one-time session and a persistent setup. It doesn't mention sibling tools but effectively clarifies when to use this tool vs. a configuration change.

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