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

Annotations already provide idempotentHint=true and destructiveHint=false; the description adds context about permanent versus session-only auth and the no-arg link behavior. However, it does not disclose what the tool returns or whether it stores/side-effects the pasted token beyond the session.

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 reasonably compact and front-loaded with the audience and purpose. It packs several usage modes into one sentence, which slightly hurts readability, but every clause adds useful information.

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?

The description covers the main invocation paths well, but with no output schema it omits what the tool returns (e.g., a link, success message, or error). Given the tool's moderate complexity and the presence of sibling tools like 'connect', this is a noticeable but not fatal gap.

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 gives 0% coverage for the optional 'token' parameter, but the description compensates by explaining exactly what values are expected: a JWT for session login, or omitted to receive an auth link. This is meaningful semantic detail beyond the bare schema.

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 identifies authentication for the MCP server as the core function, explaining the login flow and token use. It goes beyond a simple verb+object statement, though it does not explicitly contrast with the sibling 'connect' tool.

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 guidance on when to use each path: adding the token to config for permanent access, pasting it for session-only login, or calling with no arguments to get the login link. It does not name alternatives/limits, but the instruction is practical and clear.

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