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

With no annotations provided, the description carries the full burden. It discloses the authentication behavior and JWT token outcome, but doesn't mention security implications, rate limits, session duration, or error conditions. It provides basic behavioral context but lacks depth for a security-critical operation.

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?

Single sentence that efficiently communicates the core purpose with zero wasted words. Front-loaded with the essential action and outcome, perfectly sized for its function.

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 this is an authentication tool with 2 parameters, 100% schema coverage, and an output schema (implied by 'retrieve a JWT token'), the description is reasonably complete. However, for a security-sensitive operation with no annotations, it could benefit from more behavioral context about authentication requirements and token usage.

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 description coverage is 100%, so the schema fully documents both parameters. The description doesn't add any parameter-specific information beyond what's in the schema. This meets the baseline expectation when schema coverage is complete.

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 ('Authenticate') and resource ('Money Lover credentials') with a precise outcome ('retrieve a JWT token'). It distinguishes itself from all sibling tools which are data manipulation or retrieval operations, while this is an authentication operation.

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 implies this tool should be used to establish authentication before calling other tools, but doesn't explicitly state when NOT to use it or name specific alternatives. The context is clear (authentication for Money Lover), but lacks explicit exclusion guidance.

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