Open-source fork-on-write microVM sandbox primitive (E2B-compatible surface)
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forkd — Python SDK
E2B-compatible sandbox API backed by forkd.
from forkd import Sandbox
with Sandbox() as sandbox:
result = sandbox.commands.run("python3 -c 'import numpy; print(numpy.zeros(3))'")
print(result.stdout) # [0. 0. 0.]
print(result.exit_code) # 0
Or with explicit lifecycle:
sandbox = Sandbox()
result = sandbox.commands.run("echo hello")
sandbox.kill()
Bonus: warmed-state eval
If your snapshot parent imported numpy, you can skip subprocess overhead and use the warmed PID-1 interpreter directly:
with Sandbox() as sandbox:
out = sandbox.eval("numpy.zeros(5).tolist()") # ~8 ms
# vs commands.run("python3 -c '...'") which is ~108 ms (fresh subprocess)
Requirements
The forkd Rust CLI must be installed and on PATH, plus a parent snapshot
must already exist (forkd snapshot --tag pyagent ...). See the main
README for the full setup.
Status
Pre-alpha. Currently supports:
Sandbox()/Sandbox.create()— spawn one sandboxsandbox.commands.run(cmd)— run command, get stdout/stderr/exit_codesandbox.eval(expr)— eval Python in warmed PID 1sandbox.kill()— terminate
Not yet (blocked on issues #1 + #4):
- Multiple concurrent
Sandbox()instances (all share parent's MAC/IP) sandbox.files.read/write— filesystem operations- Streaming output
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