vtable_refresh_instance

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 that the tool will force a browser connection, address an iframe, and overwrite window._vtable with the latest instance. However, it does not mention side effects, failure conditions, or the need for a loaded page, leaving some behavioral transparency gaps.

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 concise sentences that front-load the main action and purpose. Every sentence adds information without redundancy, achieving high conciseness.

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 description gives the tool's purpose and typical placement in the workflow, matching the existence of an output schema and a single optional parameter. It lacks explicit notes on requirements (e.g., page must be loaded) or when to re-run, but overall it is reasonably complete for a setup step.

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 schema provides no description for the single parameter, leaving 0% schema description coverage. The description mentions 'in the target iframe', which implicitly relates to iframe_selector, but it does not explain the parameter's role, format, or default behavior. Some compensation exists, but it is not comprehensive.

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 provides a specific action: force-connect to the browser, locate the target iframe, and refresh the latest vtable instance to window._vtable. It also distinguishes itself from sibling VTable operations by noting it is a prerequisite, making the tool's role in the workflow clear.

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 the tool is typically a prerequisite for other VTable operations, giving clear guidance on when to use it. It does not mention alternatives or exclusions, but for a setup/reference operation, this is sufficient context.

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