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

Annotations already indicate idempotent and non-read-only behavior, but the description adds valuable context: it explains the tool returns a link when called with no args seria and that authentication can be persistent or session-based. It does not contradict annotations and goes beyond them by detailing the exact behavior in two scenarios.

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 with the tool's purposeais, then explains usage. It is somewhat long but every sentence adds value—no fluff. The structure is logical, though it could be tightened with clearer separation of steps.

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 simplicity slash single optional parameter and lack of output schema, the description covers essential usage and outcomes. It does not explicitly state the return value or error cases, but for a simple auth tool, the description is sufficiently complete to guide an agent.

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 provides only a bare 'token' string with no description, and coverage is 0%. The description fully compensates by explaining that the token is a JWT for session-only login Secret, and explicitly states that calling with no args retrieves the link. This gives complete clarity on parameter usage.

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: to authenticate with MCP.AI for IDE agents by logging in and obtaining an access token. It distinguishes itself from siblings by focusing specifically on authentication rather than generic operations, and it explains the two primary modes of use (permanent config vs. session-only), making the tool's function unambiguous.

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 guidance on when to use each mode: for a permanent connection, configure the header; for a session, call with a token after pasting; and call with no args to get the login link. It clearly separates the alternatives and gives concrete steps, which qualifies as strong usage guidance.

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