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

Annotations provide idempotentHint: true and destructiveHint: false, which are helpful. The description adds transparency about the authentication flow: it mentions that the token can be added to config for a permanent, non-expiring connection, or used session-only. It does not contradict annotations (idempotentHint true aligns with being non-destructive). It lacks details on what happens exactly when called with invalid token, but overall sufficient.

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 somewhat lengthy but covers essential information. It is front-loaded with the target audience and method. There is no wasted repetition, but it could be more concise (e.g., 'MCP.AI for IDE agents' could be trimmed). Overall, 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?

Given that there is no output schema and only one optional parameter, the description is quite complete. It explains the two modes of use (permanent config vs session-only), the process of obtaining the token, and the fallback of getting the link. With idempotentHint true and no out schema, the description covers the necessary context for an agent to guide the user.

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?

Schema description coverage is 0%, so the description must compensate. The description explains the 'token' parameter semantically: it accepts a JWT pasted by the user for session-only login, and it also clarifies that calling with no args returns the link. This adds meaning beyond the schema's bare 'token' definition. It could be more explicit about token format, but that's minor given the JWT hint.

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 purpose: to authenticate the user for MCP.AI IDE agents by either obtaining a browser login link or accepting an access token. It distinguishes itself from sibling tools by focusing on authentication, which is unique among the listed siblings (e.g., connect is likely a different connection tool, but not named). The verb 'authenticate' plus the context of browser login makes the purpose specific.

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 guidance: it tells the user to log in via browser, copy the access token, and then either add it to the server config for permanent access or call with a token for session-only login. It also clarifies when to call with no args to get the link, and mentions the alternative of adding the token to the config as a header. This is clear when-to-use and how-to-use guidance.

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