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

Annotations already mark the operation as idempotent and non-destructive; the description adds useful behavior context by explaining that config-based authentication is permanent/non-expiring while pasting a token is session-only, and that no arguments returns a login link. No contradiction with annotations.

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 compact: two information-dense sentences with clear 'Best' and 'Or' structuring. Every clause adds value, though the flow is slightly telegraphic and mixes config-level instructions with tool-call semantics in one block.

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 auth tool with no output schema, the description covers the key behaviors: how to authenticate permanently, how to do session-only auth, and what happens when called with no args. It does not mention error cases or post-authentication state, but these are less critical here.

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?

Schema coverage is 0%, but the description compensates well for the single optional 'token' parameter by stating it accepts a JWT pasted by the user and that omitting it returns the login link. More details about JWT format or response behavior would help, but the core semantics are clearly conveyed.

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 the tool as an authentication/login flow for MCP.AI and IDE agents, with specific actions: log in, copy token, and either configure a header or pass a token. The two distinct usage modes (permanent config vs session-only paste) add scope and make the purpose unmistakable.

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 explicitly advises the preferred permanent approach (config header) and the session-only alternative via token paste or no-args link retrieval. It does not explicitly contrast with sibling tools like 'connect', but it gives clear when-to-use guidance for this tool's own workflows.

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