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

Beyond annotations, the description explains browser login, copying the access token, the permanent header configuration, session-only token usage, and that calling with no args returns a link. It aligns with idempotentHint=true and destructiveHint=false without 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 relatively compact while covering two authentication paths and a best practice. It is somewhat dense and could be restructured for readability, but every clause 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?

For a single-optional-parameter auth tool with no output schema, the description covers purpose, parameter semantics, and both permanent and session-only flows. It doesn't describe the exact response shape, but it does mention returning a link when called with no args, providing adequate context.

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 0% schema description coverage, the description compensates by explaining the token parameter is a JWT and how to pass it, and that omitting it yields a login link. This adds meaningful semantics 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 explicitly identifies the tool as authenticating MCP.AI for IDE agents, detailing the browser login flow and token usage. It focuses on access token authentication, which distinguishes it from sibling tools like connect or marketplace.

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 provides explicit usage modes: adding the token to config for a permanent connection, or pasting it for a session-only login. It also specifies call patterns with and without the token, giving clear context for each scenario.

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