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

While annotations already mark the operation as idempotent and non-destructive, the description adds meaningful behavioral context: it distinguishes permanent non-expiring configuration from session-only login, and explains that calling with no args returns the login link. This goes beyond what annotations alone convey, though it does not discuss failure modes or return details.

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 and front-loaded with the core purpose. It uses a logical 'Best... Or...' structure to present two usage modes. Slightly more formatting could improve scannability, but every sentence contributes 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?

Given the simple one-parameter schema and helpful annotations, the description covers the main operational scenarios: no-args to request a link, token-based session login, and permanent header configuration. It could be more complete by noting what response the agent should expect after passing a token, but for this tool's complexity it is largely sufficient.

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?

With schema description coverage at 0%, the description fully compensates for the single optional `token` parameter. It explains that the token is a JWT pasted from the browser, shows the exact call shape, and clarifies that omitting the argument returns the login link. This is excellent parameter-level guidance.

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 MCP.AI login for IDE agents and outlines the browser login/access-token flow. It is unambiguous about the action, though it does not explicitly contrast itself with sibling tools like 'connect' or 'marketplace', so it falls short of full sibling differentiation.

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 gives concrete usage guidance: the recommended permanent approach via `Authorization: Bearer <token>` header, the session-only alternative via { token: "<jwt>" }, and the no-args behavior to get the login link. It lacks explicit 'when not to use' or comparison with alternatives, but the practical guidance is clear and actionable.

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