youtube_auth

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

With no annotations, the description carries the full burden. It discloses a key side effect (opens a browser window) but does not elaborate on the interactive nature, potential blocking behavior, token storage, or failure modes. This is partially transparent but lacks critical operational detail.

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 two short sentences, front-loaded with the main action, and every sentence contributes information: what it does, what happens, and why it's needed. No filler or redundancy.

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 zero-parameter auth tool, the description covers the action and the prerequisite context. It could mention how to verify success (e.g., via youtube_auth_status) or what happens after consent, but the essential information is present. Minor gaps prevent a perfect score.

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 tool has zero parameters and an empty input schema, so the baseline of 4 applies. The description appropriately focuses on the action rather than parameters, which are nonexistent.

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 function with a specific verb and resource: 'Initiate OAuth 2.0 authentication flow' and 'Opens a browser window for Google OAuth consent.' This is distinct from sibling tools like youtube_auth_status, which checks auth state, and other data-access tools.

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 context: 'Required before using any tools that access private channel data or analytics.' This tells the agent when to invoke the tool, though it does not explicitly mention alternatives or exclusions for public data access.

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