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

The description adds substantial behavioral context beyond the annotations: it explains the permanent vs. session-only distinction, the non-expiring nature of the config header, and that calling with no args returns a link. It does not reveal failure modes or session cleanup details, but given the annotations already indicate safety (idempotent, non-destructive), the added context is sufficient.

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 slightly longer than necessary but each sentence adds distinct value: audience, login method, permanent config option, session-only paste option, and fallback no-args behavior. The structure with 'Best:' and 'Or' makes options easy to parse. It is front-loaded with the core purpose.

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 simple authentication tool with no output schema, the description covers key operational aspects: how to authenticate, where to place the permanent token, how to do session-only auth, and the no-args fallback. It does not mention error handling or post-login state, but the essential steps are complete given the tool's simplicity.

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 only defines an optional 'token' string with no descriptions (0% coverage). The description compensates well by explaining the token parameter as a JWT to paste and the no-args case for getting a link. It could have specified token format more precisely, but it provides enough meaning for an agent to use the parameter correctly.

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's purpose: authenticating the MCP server for IDE agents via browser login and token capture. It distinguishes itself from siblings by detailing the auth flow (permanent config header vs. session-only paste) and no-args link retrieval. The verb 'authenticate' plus specific resources (browser, token, config) leaves no ambiguity.

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-use details: log in via browser and copy the token. It also gives clear alternatives and best practices: adding the token to the server config for a permanent connection versus pasting it for a session-only login. This effectively guides the agent on how to invoke the tool depending on user intent.

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