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

Annotations indicate an idempotent, non-destructive operation. The description adds behavioral context beyond annotations: explains that calling with no args returns a login link, and calling with a token establishes a session. It also notes the permanent vs session-only distinction, which is useful and consistent with 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 somewhat verbose but each sentence contributes value: context, best practice, invocation modes. It is front-loaded with the core action ('log in in the browser') and structured logically. Minor redundancy ('copy the access token' and 'after the user pastes') but overall efficient.

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 (two authentication modes, config vs session), the description adequately covers the essentials: how to initiate login, how to provide the token, and the permanent vs session-only distinction. It does not mention return values or error handling, but no output schema exists, and the focus is on usage.

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 by explaining the 'token' parameter: it's a JWT obtained from the browser and used for session-only login. It also clarifies the no-arg invocation to get a link, giving the parameter semantic meaning beyond the bare 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: authenticating the MCP server for IDE agents. It specifies the exact actions (log in, copy token, call with token or no args) and distinguishes from siblings like 'connect' by focusing on authentication flow rather than general connection.

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?

Provides clear when-to-use context: for IDE agents needing authentication, with best-practice guidance (config header for permanent connection vs session-only token). It does not explicitly compare with sibling tools like 'connect' but gives sufficient direction on invocation modes.

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