Authenticate

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

The description discloses behavioral traits beyond the annotation: it opens a browser window, supports new account creation, and has a side effect of enabling other tools. The annotation only indicates readOnlyHint=false, so the description adds meaningful context about the interactive flow and outcome.

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 three sentences long, each earning its place: the core action, the account flexibility, and the usage guidance. It is front-loaded with the essential verb and resource, and there is no redundant or filler text.

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 parameterless tool with no output schema, the description is complete: it explains what happens, the prerequisite condition, and the post-condition. It also integrates well with sibling tools by referencing check_auth_status, providing enough context for an agent to sequence calls correctly.

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 zero parameters, the schema coverage is trivially 100%, and the baseline for 0 params is 4. The description appropriately does not invent parameter explanations; it focuses on behavior and usage, which is sufficient here.

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 action ('Authenticate with ULink'), the method ('opening a browser window'), and covers both sign-in and sign-up. It distinguishes itself from siblings by referencing check_auth_status and positioning itself as the first tool to call for missing credentials.

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 explicitly states when to use the tool: 'This is the first tool to call if check_auth_status reports no valid credentials.' It also notes the consequence ('all other ULink tools become usable'), implying it's a prerequisite. However, it does not explicitly state when not to use it (e.g., if already authenticated), though this is strongly implied.

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