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

Annotations declare idempotentHint=true, destructiveHint=false, readOnlyHint=false. The description does not contradict these but adds some context about creating a permanent or session-only connection, which is helpful. However, it doesn't fully disclose side effects (e.g., what happens to existing tokens, rate limits, or how the token is stored), though the context is decent given the 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?

Two sentences, front-loaded with the purpose and structured options. Every word contributes value, and the colon-guided list makes it easy to scan. No fluff.

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 simple auth tool with one optional parameter and no output schema, the description is complete enough to guide an agent. It covers the two main flows (with/without token) and the permanent vs session distinction. A small gap is that it doesn't mention what the response is, but that's not critical given the tool's simple nature and the absence of an output schema.

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 must compensate. It explains that the 'token' parameter is the JWT to paste for session-only login, and that omitting it returns the login link. This adds meaning beyond the raw JSON schema, effectively documenting the single parameter.

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 'authenticate' is used to log in to MCP.AI for IDE agents, with a specific verb and resource. It distinguishes between two modes (permanent via config header vs session-only via token parameter), leaving no ambiguity.

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?

It provides clear context on when to use it (first-time authentication) and offers two explicit options for the user, but it does not explicitly mention alternatives among the sibling tools (e.g., 'connect' or 'marketplace'), so there's no direct comparison. Still, it implicitly differentiates by stating the two authentication flows.

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