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

Annotations indicate this is not read-only (readOnlyHint=false) and is idempotent (idempotentHint=true), but the description does not discuss behavior beyond the login flow. It mentions the token can be passed or config changed, but does not describe side effects (e.g., what happens with no args). The description is not contradictory, but it adds little beyond annotations.

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 a single sentence but is dense and difficult to parse. It contains multiple instructions and alternatives without clear structure, which harms scannability. It could be split into bullet points or steps. It is not overly long, but the structure is not ideal for an AI agent to quickly understand.

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 complexity (authentication flow with multiple options), the description covers the main scenarios: permanent vs session login, and how to get the link. It is reasonably complete for a single-param tool with no output schema. However, it could be clearer about the exact behavior of calling with no args, but it does state that. This is adequate.

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 parameter 'token' with no description, and the description does explain it: 'paste it here for a session-only login: call with { token: "<jwt>" }'. This adds semantics beyond the schema's bare property, but it is not comprehensive (e.g., no format details, though JWT is mentioned). With 0% schema coverage, the description compensates partially.

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's primary purpose is to guide IDE agents on authentication, but it is not framed as a tool description. It does not clearly state what the tool does with a specific verb and resource; instead, it describes a broader authentication flow. It does distinguish itself from siblings by focusing on authentication, but it is more of a tutorial than a tool definition.

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 the tool (to authenticate for IDE agents), and provides two usage scenarios: adding a token to the server config for permanent access, or calling with a token for session-only login, or calling with no args to get a login link. It does not compare with alternatives directly, but the context is clear.

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