agent-venv (Python)
Python implementation of agent-venv. See the root README for the project overview and the spec/ directory for the cross-language contract.
Install
pip install agent-venv
# or, from this monorepo:
uv pip install -e .
Requires Python 3.10+.
Layer 1 — generic environment
import subprocess
from agent_venv import Environment, EnvironmentSpec
# Ephemeral: cleaned up on context exit
with Environment.ephemeral(
EnvironmentSpec(env_overrides={"CLAUDE_CONFIG_DIR": "$EPHEMERAL_HOME"})
) as env:
subprocess.run(
["claude", "--print", "hi"],
env={**os.environ, **env.env_overrides},
cwd="/anywhere",
)
# Persistent: keyed by name, survives the process
env = Environment.create_or_attach(
"myapp-skill-x",
EnvironmentSpec(env_overrides={"CLAUDE_CONFIG_DIR": "$EPHEMERAL_HOME"}),
)
print(env.path, env.env_overrides)
# ...later, from anywhere...
env = Environment.attach("myapp-skill-x")
The library never spawns the agent. The caller does. The library only manages the profile dir and the env vars to point the agent at it.
Layer 2 — built-in adapters
ClaudeCode and Codex are thin wrappers that produce the right EnvironmentSpec, including reading host credentials so the agent runs under your subscription.
from agent_venv import Environment, ClaudeCode
with Environment.ephemeral(adapter=ClaudeCode()) as env:
subprocess.run(
["claude", "--print", "hi"],
env={**os.environ, **env.env_overrides},
)
The adapter copies your ~/.claude/.credentials.json (or macOS Keychain entry) into the new profile with mode 0600. The original is not modified.
Persistent registry
Persistent envs live under $XDG_DATA_HOME/agent-venv/envs/ (or ~/.local/share/agent-venv/envs/). Override with AGENT_VENV_REGISTRY_ROOT env var or per-call registry_root=.
Environment.list() # all persistent env names
Environment.attach("name") # raises if missing
Environment.destroy_by_name("name") # removes from disk + registry
env.refresh_credentials() # re-copy host credentials
Async
from agent_venv import AsyncEnvironment
async with await AsyncEnvironment.ephemeral(adapter=ClaudeCode()) as env:
...
Errors
from agent_venv import errors
try:
Environment.attach("missing")
except errors.EnvironmentNotFoundError as exc:
print(exc.kind, exc) # "EnvironmentNotFound", "..."
All errors subclass errors.AgentVenvError and carry a kind: str matching the spec.
Conformance
python -m agent_venv.conformance < requests.ndjson
1 maintainer
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