start_authentication

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes the tool's behavior: it returns a URL for OAuth flow and requires user interaction (opening in browser, copying callback URL). However, it lacks details on potential errors, timeouts, or prerequisites, leaving some behavioral aspects unclear.

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 front-loaded with the core purpose in the first sentence, followed by essential details about the return value and user instructions. Each sentence adds value without redundancy, and the structure is logical and efficient, making it easy to parse quickly.

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?

Given the tool's complexity (authentication flow) and lack of annotations or output schema, the description does a good job explaining the process and return value. However, it could be more complete by mentioning error handling or linking to 'complete_authentication' for the next step, slightly reducing the 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 input schema has 0 parameters with 100% coverage, so no parameter documentation is needed. The description appropriately does not discuss parameters, focusing on the tool's purpose and output. A baseline of 4 is applied since it compensates well for the lack of parameters by explaining the tool's function clearly.

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 specific action ('Start the OAuth authentication flow') and the target resource ('with Kroger'), distinguishing it from sibling tools like 'complete_authentication' or 'test_authentication'. It precisely defines what the tool initiates without being vague or tautological.

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 clear context on when to use this tool: to begin authentication with Kroger, returning a URL for browser-based authorization. However, it does not explicitly state when not to use it (e.g., if already authenticated) or name alternatives like 'force_reauthenticate' for different scenarios, limiting it to a 4.

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