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

The description discloses key behavioral traits: calling with no args retrieves a link, and calling with a token performs a session-only login. It adds context about permanent vs. session-based auth. Annotations already indicate idempotency and non-readOnly behavior, and the description is consistent. However, it does not explain error handling, return values on success/failure, or whether the tool modifies server state beyond session establishment.

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 bit longer than necessary and mixes instructions for humans (log into browser, copy token) with agent-facing usage. It is structured in three sentences and front-loads the authentication purpose, but it could be tightened to avoid redundant or confusing phrasing. It earns a mid-range score because every sentence adds some value but it is not maximally concise.

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 has no output schema and no annotations describing return behavior, the description partially covers what to expect (e.g., 'get the link' when called with no args). However, it does not specify what a successful token acceptance returns, whether errors are surfaced, or the exact format of the login link. It is adequate but incomplete for an interactive authentication flow.

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 only defines 'token' as a string with no description. The description compensates by clarifying that the token is a JWT, that it is optional, and that calling without it returns a login link. This adds meaningful semantic information beyond the raw schema, especially important given 0% schema description coverage.

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 the tool's purpose: to authenticate IDE agents (like Cursor) to the MCP server. It explains the two primary modes (providing a token or requesting a login link) and distinguishes from siblings by focusing on authentication rather than other features. While it is a bit verbose and includes instructions for humans, the core action is unmistakable.

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 practical guidance on how to use the tool: call with { token } after pasting, or with no args to get a login link. It also mentions a preferred alternative (adding a header to the server config) for a permanent connection. However, it does not explicitly compare to sibling tools like 'connect' or state when NOT to use this tool, leaving some room for ambiguity.

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