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

Description adds behavioral context beyond annotations: it explains the permanent vs. session-only distinction and that no args yields a link. Annotations already indicate idempotent and non-destructive, so the extra detail about auth modes is valuable. No contradiction found.

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 moderately long but every sentence contributes: it explains the process, the two alternatives, and the argument usage. It is front-loaded with the core purpose and structured logically, though slightly verbose for an authentication tool.

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 a single optional parameter and no output schema, the description covers all necessary aspects: the authentication flow, both invocation patterns, the target audience (IDE agents), and the meaning of the token. It is self-contained and adequate for an agent to call 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?

With 0% schema description coverage, the description fully compensates by explaining the token parameter: 'call with { token: "<jwt>" }' and 'with no args to get the link.' It clarifies that the token is a JWT and that omitting it requests a link. This is more informative than the raw 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 function: 'MCP.AI for IDE agents (Cursor, etc.): log in in the browser, copy the access token.' It distinguishes authentication from sibling tools by specifying the login flow and token handling. The purpose is specific and actionable.

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 explicit guidance on two usage modes: 'Best: add it to this server's config as a header ... for a permanent, non-expiring connection' and 'Or paste it here for a session-only login: call with { token: "<jwt>" } after the user pastes, or with no args to get the link.' This clearly instructs when to use each approach and how to invoke the tool.

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