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

Annotations already indicate idempotentHint=true and non-destructive behavior, and the description adds context by distinguishing permanent (config-based) vs session-only (token-based) authentication. It discloses that a no-arg call generates a login link, providing behavioral transparency beyond the schema. No contradiction with annotations exists.

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 three sentences, front-loaded with the primary purpose and followed by alternative configurations. Each sentence earns its place with no fluff or redundant detail.

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 simple one-optional-parameter shape and no output schema, the description covers the full usage flow: browser login, token capture, persistence vs session, and no-arg link retrieval. It could mention error cases or exact return format, but for this low-complexity tool it is sufficient.

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 single `token` parameter has no schema description, but the description fully explains it: a JWT copied from the browser, used for session-only login. It also clarifies the parameter is optional by explaining the no-args behavior, effectively compensating for the 0% schema 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 states the tool is for authentication/login to MCP.AI from IDE agents, explaining the browser-based login flow. It specifies the exact resource (MCP.AI) and action (log in, copy access token), distinguishing it from generic tools like connect or marketplace. There is no tautology or vagueness.

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 contextual instructions: users can either configure a persistent Authorization header or pass a token for a session-only login. It also states that calling with no arguments returns the login link, giving clear guidance on invocation variants. It does not explicitly mention when not to use this tool, but that's acceptable for an auth utility.

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