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

Annotations indicate idempotentHint=true and readOnlyHint=false, and the description adds behavioral context: token can be stored permanently in server config or used for a session-only login. It discloses side effects (setting a token, generating a link) beyond the structured fields, without contradicting annotations.

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 dense but not excessively long, packing several instructions into three sentences. It is front-loaded with the action and provides examples inline. Slightly dense due to multiple clauses, but each phrase 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 the tool's simplicity and the sparse schema, the description covers all necessary aspects: what the tool does, both usage modes, the parameter format, and the no-arg case. No output schema is required, so nothing critical is missing.

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 0% schema description coverage, the description fully compensates by explaining the 'token' parameter as a JWT to paste, and the no-argument behavior to retrieve a login link. This is precisely the kind of parameter semantics the schema fails to provide.

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 MCP.AI for IDE agents via browser login and token. It provides specific actions (log in, copy token, call with token or no args) and differentiates from siblings like 'connect' by focusing on auth token handling.

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 gives clear context on usage: permanent config vs. session-only, and mentions calling with or without arguments. It doesn't explicitly name sibling tools as alternatives, but implies decision-making between permanent and session-based authentication, which is strong guidance.

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