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

The description discloses the session behavior ('session-only login') and the permanent config option, adding context beyond the idempotentHint annotation. However, it doesn't explain what happens if an invalid token is provided or whether the operation invalidates existing sessions. It doesn't contradict the annotations—idempotentHint:true is consistent with a fire-and-forget authentication setup—but the explanatory burden is only partially met. The description provides some insight into side effects, but not exhaustively.

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 a single run-on sentence that crams multiple instructions and alternatives, making it harder to parse. It front-loads the purpose but then meanders through configuration options, sentences like 'MCP.AI solo for IDE agents (Cursor, etc.):' are awkwardly placed. It's compact but not well-structured, and the flow could be improved with bullets or more deliberate punctuation.

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 tool with one optional parameter and no output schema, the description covers the main scenarios: permanent config via header, session-based token, and no-arg link retrieval. It doesn't explain error cases or what happens after authentication, but given the simplicity of the tool, this is largely sufficient. The integration with server config is a good contextual detail that aids the 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?

With a schema that only defines 'token' as an optional string and 0% schema description coverage, the description carries full responsibility for explaining the parameter. It explains that 'token' expects a JWT and that omitting it returns a link. This meaningfully adds to the minimal schema, though it could be more explicit about the exact format or give an example. Still, it compensates well for the lack of schema hints.

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 this tool handles authentication, with a specific verb ('authenticate') and resource (the MCP server's connection to the IDE agent). It explicitly describes the login flow and token usage, distinguishing it from sibling tools like 'connect' or 'marketplace' which serve different purposes. The focus on browser login and token handling leaves no ambiguity about its role.

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 concrete usage guidance: the recommended approach (configure via header), the alternative (pass token in the call), and the no-arg option to retrieve a link. It implicitly tells when to use each variant, though it doesn't explicitly say when not to use the tool or contrast with alternatives like 'connect' beyond the content. This is clear operational guidance.

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