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

Beyond the annotations, the description explains the session vs. permanent distinction, mentions the Authorization header format, and states that no-args returns a login link. It adds meaningful behavioral context without contradicting the idempotent hint.

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 concise and front-loaded, providing the essential workflow in a few sentences. It is somewhat dense with nested instructions, but every sentence adds value.

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 authentication tool with one optional parameter and no output schema, the description covers the key usage scenarios, persistent vs. session-based auth, and how to trigger the browser login. It is sufficiently complete for an agent to select and call the tool 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?

The schema only describes `token` as a string with no explanation, while the description clarifies it is an optional JWT used for session-only login and that omitting it retrieves the login link. This compensates well for the 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 states the tool's purpose: authenticating to MCP.AI for IDE agents by logging in, copying an access token, and using it for either persistent or session-only access. It uses a specific verb and resource and distinguishes itself from sibling tools by explaining the exact authentication flow.

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 clear context for when to use each invocation mode: adding the token to server config for a permanent connection, passing the token for a session-only login, or calling with no args to receive the login link. It does not explicitly name alternative sibling tools, but it gives strong practical guidance on how to authenticate.

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