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

The description adds context beyond the annotations: it explains the permanent vs session-only behavior and that calling with no args returns a link. Annotations already declare idempotent and non-destructive, which aligns with the description. It does not contradict the annotations and provides meaningful behavioral details about the token flow.

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 two sentences and front-loaded with the purpose. It efficiently covers the two usage modes without excess verbosity. The second sentence is long but coherent. It is appropriately concise and readable.

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 authentication complexity, the description covers the main usage paths (permanent config, session token, link retrieval) and implies the return value ('get the link'). It lacks explicit mention of error handling or response format, but for an authentication tool with no output schema, this is reasonably complete for agent use.

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 well by explaining that 'token' is a JWT and optional: it can be passed for session login or omitted to get the link. This adds semantic meaning beyond the raw schema property name and type, though it could be slightly more explicit about the token's format or validation.

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 what the tool does: it authenticates IDE agents via a browser login and token retrieval. It distinguishes itself from siblings by specifying the exact flow (log in, copy token) and the two ways to use the token (permanent config vs session). The verb 'authenticate' and resource are explicit, and the description gives concrete steps, making it unambiguous.

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 clear context on how to use the tool: with no args to get a login link, or with a token for session login, and recommends the permanent config option. While it doesn't explicitly contrast with sibling tools like 'connect', it gives sufficient situational guidance for typical use. It could be stronger with an explicit 'use this when...' but is otherwise helpful.

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