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

Annotations indicate idempotentHint=true and readOnlyHint=false, but the description goes beyond by explaining that calling with the token sets up a session-only login, while the permanent approach is via config. It also discloses that the token can be pasted and that calling with no args generates a link. There is no contradiction; the description adds useful behavior details about the two login flow variants and the permanence of each, though it doesn't explicitly mention side effects like token storage or session creation.

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 concise and front-loaded with key info: it names the audience, the main action (log in in browser, copy token), and the two usage modes. The sentences are efficient but a bit run-on and could be split for clarity, yet they contain no fluff. It earns a 4 for being compact and informative.

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 tool's simplicity (one optional parameter, no output schema), the description provides adequate context for an agent to call it correctly. It covers the two possible call patterns (with and without token) and the expected user interaction. It lacks explicit mention of what the tool returns (e.g., a success message) but that's not required given no output schema, and the tool's behavior is well defined for its scope.

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 schema has one optional 'token' parameter with no description (coverage 0%). The description compensates by explaining that 'token' is a JWT string pasted by the user for session-only login, and that omitting the token triggers the link generation. This provides clear semantics beyond the raw schema, though it doesn't give formal type details (e.g., JWT format) beyond the example.

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: to handle authentication for IDE agents by either providing a browser login link or accepting a token for session-based login. It distinguishes itself from siblings by focusing specifically on the authentication flow, mentioning the 'connect' sibling indirectly via browser-based login, and clarifying the two usage modes.

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 explicitly explains when to use this tool and provides detailed instructions: it says to log in in the browser, copy the token, and either add it to the server config for permanent access or call this tool with the token for session-only login. It also clarifies the no-args call to get the link, making the usage clear and complete.

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