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

The description goes beyond the annotations by explaining the actual behaviors: calling with no arguments returns an authentication link, and passing a JWT enables a session-only login. It also highlights the permanence of config-based auth vs. session-based token, which is useful behavioral context for the agent.

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?

Three sentences cover all relevant behaviors without excessive verbosity. The structure is reasonable, although the first sentence is a little informal and mixes user instructions with tool behavior; the remaining sentences are well targeted.

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?

The description is complete enough for an optional token that is optional and no output schema. It would be slightly better to describe the actual return value shape for the no-args case, but the phrase 'to get the links' already identifies the output in functional terms.

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 declares a single 'token' string with no description. The description compensates fully by explaining what the token is, that it is an optional JWT, and how to use it: call with { token: '<jwt>' }. The no-argument flow is also described, covering all execution scenarios.

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 makes it clear that this tool handles authentication for MCP.AI with IDE agents, including both generating a login link and accepting a session token. It is more instructional than a terse 'authenticate' statement, but the purpose and flow are well identifiable.

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?

Explicit guidance is provided for when to call with a token versus when to call with no arguments, and it encourages the permanent config alternative as the preferred method. This gives an agent clear options and effectively distinguishes between a session-only tool call and a non-tool setup.

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