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Forking creates a child run that inherits the parent’s sandbox and harness. The child starts from the parent’s final workspace state, so any files the parent wrote are available to the fork. 
child_run = run.fork(
    prompt="Now translate that to French instead.",
    imports=[
        LocalImporter(path="./documents"),
    ],
)
You can also fork later from another script: 
from trelent_agents import Client, LocalImporter

client = Client(client_id="...", client_secret="...")

parent_run = client.runs.get("run_1234567890")

sibling_run = parent_run.fork(
    prompt="Translate the same text to German.",
    imports=[
        LocalImporter(path="./documents"),
    ],
)
Forks reuse the parent’s sandbox and harness. They can’t be changed on the fork call — create a fresh run if you need a different harness or sandbox.