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

The description adds behavioral detail beyond the annotations: it discloses that the tool returns a login link when called with no arguments, accepts a JWT in a specific format, and differentiates between permanent (config-based) and session-only authentication. It aligns with the idempotentHint=true annotation and provides context that would not be known otherwise.

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 compact at roughly 70 words, with the core action front-loaded ('log in in the browser, copy the access token'). It efficiently conveys two usage paths and a best-practice recommendation without extraneous words, though the parenthetical about config could be seen as slightly tangential.

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 no output schema and one optional parameter, the description covers the essential behaviors: how to initiate login and how to complete it. It omits details like response format or error handling, but given the low complexity and the strong parameter documentation, it is sufficiently complete for an agent to use correctly.

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 provides zero documentation for the 'token' parameter (0% coverage), but the description fully compensates by specifying that it is an optional JWT string and that omitting it yields a login link. It even illustrates the exact call format, making the parameter's behavior completely clear despite the sparse 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 states the tool's purpose: to log in and obtain an access token via browser or accept a JWT token. It uses specific verbs like 'log in', 'copy', 'paste' and describes two concrete invocation modes (no args for link, token arg for session). This distinguishes it from the sibling tools, making its function 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 gives clear contextual guidance: it suggests the best practice of adding the token to the server config for a permanent connection, and explains the session-only alternative. It explains how to use the tool in two distinct scenarios but does not explicitly contrast it with sibling tools like 'connect' or state when not to use it, missing the 'when-not' component required for a 5.

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