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

Adds context about the IDE agent audience and two invocation modes, but doesn't describe internal side effects like session creation or state changes. Annotations (readOnlyHint false, destructiveHint false) already cover the mutation profile, and the description doesn't contradict them, but it could clarify what happens after successful authentication.

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 slightly verbose but structured logically: explains the flow, presents two usage options, and specifies invocation. Every sentence contributes useful information; a bit of trimming could improve conciseness without losing 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?

For a simple auth tool with a minimal schema and no output schema, the description covers the essential use cases and expected behavior. It could mention potential error conditions or return values, but it's adequate for the tool's simplicity.

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 has a single optional 'token' parameter with no description (0% coverage). The description compensates by explaining the token is a JWT for session login and that calling with no args gets a link, adding meaning beyond the bare schema.

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 users for MCP.AI via browser login and token handling. It distinguishes itself from siblings like 'connect' by focusing on token-based authentication flow, with explicit verbs like 'log in' and 'authenticate'.

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?

Provides explicit guidance on when to use the tool and how to invoke it: either with a token for session-only login or without args to obtain a link. It also recommends a config-based permanent approach, giving clear contextual usage instructions.

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