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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=true, so the description is not solely responsible. It adds that calling with no args returns a link and that providing a token performs a session-only login, giving some behavioral context. However, it omits potential side effects like invalidating existing tokens, rate limiting, or whether sessions persist across calls, leaving some gaps in transparency.

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 informative but delivered as a single, dense sentence with multiple clauses and a colon-heavy structure. Every piece of information is useful, but it could be broken into bullet points or shorter sentences for easier parsing. It is not overly long, but it lacks the crispness of a well-structured explanation.

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 tool with one optional parameter and no output schema, this description covers the essential flows: no-arg returns a link, token-based call performs session login, and permanent configuration is an alternative. It mentions the JWT format and the session-only scope, making it nearly complete. Minor missing details (e.g., what happens after a successful token submission) prevent a perfect score.

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 provides zero description for the optional 'token' parameter (0% schema coverage), so the description must compensate fully. It does so exceptionally well by explaining to call with `{ token: "<jwt>" }` after the user pastes the token, and that calling with no args yields a link. This clearly defines the parameter's format, purpose, and the no-argument behavior, going far beyond the 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 clearly indicates this tool handles authentication for IDE agents and distinguishes it from siblings by specifying it's for login and token management. It explicitly states two modes: no args to get a link, or with a token for session login. It could be more direct, but it's not tautological and effectively communicates the tool's purpose.

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 guidance: 'Best: add it to this server's config as a header Authorization: Bearer <token> for a permanent, non-expiring connection. Or paste it here for a session-only login.' This gives a clear when-to-use between permanent config and session-based use, and instructs calling with no args to obtain the link. It could name sibling tools explicitly, but the decision rule is evident.

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