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

The description discloses behavioral aspects beyond annotations: calling with no args yields a login link, while providing a token enables a session-only login. It also explains permanence differences between config-based and session-based methods. This adds useful context beyond the annotations (idempotentHint true, destructiveHint false) without contradiction.

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 yet dense with information, using three sentences to convey purpose, two usage modes, and parameter behavior. It front-loads the purpose and avoids fluff, though it is slightly more verbose than strictly necessary.

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 (auth flow with two modes), the description covers all essential aspects: how to obtain access, token vs config, session vs permanent, and how to invoke. No output schema exists, but the description doesn't need to explain return values. Minor omissions like error handling or post-auth behavior, but overall sufficient for an auth tool.

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 only parameter 'token' is undocumented in the schema (0% coverage), but the description fully explains its meaning: a JWT for session-only login, and that omitting it returns a link. This fully compensates for the schema gap, making the parameter's purpose and usage unambiguous.

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.AI server for IDE agents by logging in, obtaining an access token, and supporting two modes (permanent via config header vs session-only via token). It distinguishes itself from sibling tools by focusing specifically on authentication, not general connectivity or utilities.

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 provides explicit usage scenarios: 'Best: add it to this server's config as a header...' for permanent access, and 'Or paste it here for a session-only login' with clear instructions to call with a token or without args. It does not explicitly mention when not to use this tool or contrast with 'connect', but the context is clear enough for an IDE agent to decide when to invoke it.

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