Apply Approved YNAB Assignment Preview

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

Annotations already indicate this is not read-only and not idempotent. The description adds that the token is short-lived and requires explicit approval, but it does not explain the side effects of applying or whether the operation is reversible. This is useful but limited context beyond the annotations.

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 a single, front-loaded sentence with no wasted words. It efficiently communicates the action and the required condition.

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 tool is a simple one-parameter mutation without an output schema, but the description omits side effects, return value, and error conditions. It is adequate for basic understanding but incomplete for an agent to fully predict the tool's behavior.

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 schema_description_coverage at 0%, the description needed to provide meaning for the preview_token parameter. It only says 'short-lived assignment preview token,' which largely restates the parameter name. No format, origin, or validity details are given, so the agent must infer from the name alone.

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 applies a short-lived assignment preview token, and specifies the exact condition ('only after the user explicitly approves the exact preview'). This distinguishes it from the sibling tool ynab_preview_assignments, which creates the preview.

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 gives an explicit usage condition: use only after user approval. It implies this is the follow-up step to previewing assignments, but it does not explicitly name alternative tools or state when not to use.

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