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

The description discloses behavioral traits beyond the annotations: adding to config creates a permanent connection, pasting provides session-only login, and calling with no args returns a link. It implies side effects (e.g., updating server config) and expectations (user interaction). This goes beyond the idempotentHint and destructiveHint annotations, though it does not detail error handling or security implications.

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 wordy but conveys all necessary information. It front-loads the purpose and then explains the workflow. The structure is logical, though it could be streamlined (e.g., separating configuration steps from API call options). It is appropriately sized for the complexity of the authentication process.

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 covers the tool's purpose, usage steps, parameter semantics, and behavioral outcomes. It does not specify the exact return value format (e.g., the link structure) or address potential edge cases. However, given the schema simplicity and annotations, it is sufficiently complete for an authentication tool.

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 defines an optional 'token' string without description. The description adds meaning: if provided, it is a JWT for authentication; if omitted, the tool returns a login link. It also clarifies the token's role in permanent vs. session setup. This greatly enhances parameter understanding beyond the 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 the MCP server with an IDE agent. It explicitly explains the authentication workflow (browser login, token retrieval, adding to config or pasting for session-only). The verb 'authenticate' and resource context are evident.

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 instructions: 'call with { token: "<jwt>" } after the user pastes, or with no args to get the link.' It also contrasts permanent vs. session-only login methods. However, it does not explicitly compare this tool to alternatives (e.g., when to prefer one over another), though the context implies this is the primary authentication method.

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