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switch_instance

Switch active browser instance to a specified instance_id. Background instances remain active with cookies and tabs preserved for later swapping.

Instructions

⭐ Make instance_id the active one for subsequent tool calls.

The previous current instance continues running in the background,
cookies/tabs preserved. Swap back anytime.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
instance_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

No annotations provided; description discloses that the previous instance continues running and data is preserved, which is essential behavioral context. Missing details on auth or side effects, but adequate for the tool's simplicity.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with a star emoji, no wasted words. Every sentence contributes meaningful information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Simple tool with one parameter; description covers switching behavior and persistence. Has an output schema (not shown) but not needed. Complete for agent understanding.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has no description for 'instance_id' (0% coverage). The description does not explain what instance_id is or how to obtain it, relying solely on the property name. Does not add meaning beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it makes an instance the active one for subsequent calls, specifying the verb 'make' and resource 'instance'. It distinguishes from siblings like 'close_instance' or 'list_instances'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explains that the previous instance continues running in the background with cookies/tabs preserved and can be swapped back. It implies when to use (switch context without losing state) but does not explicitly 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.

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