Chalk Sandbox SDK
Python SDK for the Chalk Sandbox gRPC service. Create sandboxes, execute commands, and stream output over bidirectional gRPC streams.
Contributor note: for testing deployed functions against local chalkcompute
or local chalk-remote-call-python changes, see
local-sdk-remote-call-testing.md.
Install
pip install grpcio protobuf
Quick start
from chalkcompute import SandboxClient
with SandboxClient.from_env() as client:
# Create a sandbox from a pre-built image
sandbox = client.create(image="ubuntu:latest")
# Run a command
result = sandbox.exec("echo", "hello world")
print(result.stdout_text) # "hello world"
print(result.exit_code) # 0
# Clean up
sandbox.terminate()
Declarative images
Build custom container images with a fluent API instead of writing Dockerfiles. The image spec is serialized as protobuf and transmitted to the sandbox service, which builds and caches the image before starting the container.
from chalkcompute import Image, SandboxClient
# Build a data-science image declaratively
img = (
Image.debian_slim()
.pip_install(["pandas", "numpy", "scikit-learn"])
.run_commands(
"apt-get update && apt-get install -y git curl",
)
.workdir("/home/user/app")
.env({"PYTHONDONTWRITEBYTECODE": "1"})
)
with SandboxClient.from_env() as client:
sandbox = client.create(image=img)
result = sandbox.exec("python", "-c", "import pandas; print(pandas.__version__)")
print(result.stdout_text)
sandbox.terminate()
Base images
# Arbitrary base image
img = Image.base("node:25-trixie-slim")
# Convenience: python + debian slim
img = Image.debian_slim() # python:3.14-slim-trixie
# From an existing Dockerfile (contents are inlined, so you can chain more steps)
img = Image.from_dockerfile("Dockerfile").pip_install(["extra-dep"])
Build steps
img = (
Image.debian_slim()
# Install Python packages
.pip_install(["requests", "flask"])
# Install from a requirements.txt (read locally, inlined into the spec)
.pip_install_from_requirements("requirements.txt")
# Run shell commands (each becomes a Docker RUN layer)
.run_commands(
"apt-get update && apt-get install -y git",
"mkdir -p /app/data",
)
# Add local files into the image
.add_local_file("config.yaml", "/app/config.yaml")
.add_local_file("entrypoint.sh", "/app/entrypoint.sh", mode=0o755)
.add_local_dir("src", "/app/src")
# Raw Dockerfile instructions
.dockerfile_commands(["EXPOSE 8080", "HEALTHCHECK CMD curl -f http://localhost:8080/"])
# Image-level configuration
.workdir("/app")
.env({"FLASK_APP": "app:create_app"})
.entrypoint(["/app/entrypoint.sh"])
.cmd(["serve"])
)
Immutable composition
Each builder method returns a new Image, so intermediate images can be shared:
base = Image.debian_slim().pip_install(["requests"])
# Two different images that share the same base
api_image = base.pip_install(["flask"]).workdir("/api")
worker_image = base.pip_install(["celery"]).workdir("/worker")
api_sandbox = client.create(image=api_image)
worker_sandbox = client.create(image=worker_image)
api_sandbox.terminate()
worker_sandbox.terminate()
Connecting
from chalkcompute import SandboxClient
import grpc
# Insecure (local dev)
client = SandboxClient("localhost:50051")
# With TLS
creds = grpc.ssl_channel_credentials()
client = SandboxClient("sandbox.example.com:443", credentials=creds)
# As a context manager
with SandboxClient("localhost:50051") as client:
...
Rotating workload identity
The SDK can use a directly usable Chalk JWT from a rotating token file instead of a client ID and secret:
export CHALK_WEB_IDENTITY_TOKEN_FILE=/var/run/secrets/chalk/identity-token
export CHALK_API_SERVER=https://api.chalk.ai
Each SDK client caches the token for the shorter of one hour or half of the
token's remaining lifetime from its exp claim, then re-reads the file on its
next authenticated operation. Tokens without exp use the one-hour limit.
Changing the configured file path bypasses the cache. The JWT's
environment_id claim selects the environment unless CHALK_ENVIRONMENT or
CHALK_ENVIRONMENT_ID is set explicitly. Queued function calls additionally
require CHALK_GRPC_ENGINE, because identity JWTs do not contain engine-routing
data.
Workload identity federation
Use the authenticated Connect client to mint a short-lived OIDC token for a third-party workload identity provider. For example, with Snowflake configured to trust Chalk's issuer and JWKS:
from chalkcompute import ConnectClient
token = ConnectClient().get_workload_identity_token("snowflakecomputing.com")
The token is scoped to the active Chalk environment. Its audience is the value
passed to get_workload_identity_token, and its signing key is published by the
Chalk API server at /.well-known/jwks.json.
Evaluations
Create a reusable evaluation by pinning a completed dataset revision to a
deployed task function and one or more deployed scorer functions. A dataset
name resolves to its latest revision when the evaluation is created, and the
resolved revision is then pinned. Function parameters bind to dataset columns
by name; scorers may additionally declare output and trace parameters.
import chalkcompute as cc
dataset = cc.DatasetRevisionRef(
dataset_name="support_goldens",
)
@cc.function(name="support-answer")
def answer(input: str) -> str:
return call_support_model(input)
@cc.function(name="response-quality")
def response_quality(input: str, output: str) -> cc.EvaluationScorerResult:
score, details = score_response(input=input, output=output)
return cc.EvaluationScorerResult(
score=score,
metadata={"details": details},
)
evaluation = cc.Evaluation.create(
"Customer Support Chatbot",
dataset=dataset,
task=answer,
scorers=[response_quality],
metadata={"suite": "release"},
)
run = evaluation.run(metadata={"git_sha": "abc123"}).wait()
print(run.status, run.result_dataset)
@cc.function deploys synchronously, so the direct handles above already have
immutable function version IDs by the time Evaluation.create runs. Existing
functions can instead be attached by reference:
evaluation = cc.Evaluation.create(
"Customer Support Chatbot",
dataset=dataset,
task=cc.RemoteFunction.from_name("support-answer"),
scorers=[cc.RemoteFunction.from_id("fn_brand_alignment_v2")],
)
RemoteFunction.from_name resolves the latest version at lookup time;
evaluation creation then pins that version. An imperative RemoteFunction
must be explicitly deployed before it can be used in an evaluation.
Scorers may return a numeric scalar, one EvaluationScorerResult, or a
list[EvaluationScorerResult]. Returning a list lets one scorer emit multiple
scores from shared computation; an empty list emits no scores for that row.
Each result carries a normalized score and optional row-level JSON-serializable
metadata. The return annotation declares the Arrow schema, and the class-level
Arrow hooks handle nested serialization, so the generic function runtime does
not need scorer-specific behavior.
Sandbox lifecycle
# Create with resource limits
sandbox = client.create(
image="ubuntu:latest",
cpu="2",
memory="4Gi",
env={"DEBIAN_FRONTEND": "noninteractive"},
chalk_identity=True,
)
# List all sandboxes
for info in client.list():
print(f"{info.id} {info.status} {info.name}")
# Get a handle to an existing sandbox by ID
existing_sandbox = client.get(id="550e8400-e29b-41d4-a716-446655440000")
# Fetch info from server
info = existing_sandbox.refresh() # force re-fetch
print(info.status)
# Terminate, optionally with a grace period
sandbox.terminate()
existing_sandbox.terminate(grace_period_seconds=30)
Set chalk_identity=True to give the sandbox a platform-managed Chalk
identity. The sandbox receives CHALK_WEB_IDENTITY_TOKEN_FILE and the Chalk
API/environment settings it needs to authenticate without caller credentials
being copied into the workload.
Executing commands
Run and wait
result = sandbox.exec("ls", "-la", "/tmp")
for line in result.stdout:
print(line)
for line in result.stderr:
print(f"ERR: {line}")
print(f"exit code: {result.exit_code}")
# Or get the full text at once
print(result.stdout_text)
print(result.stderr_text)
Stream output in real time
for event in sandbox.exec_stream("make", "build", workdir="/app"):
if event.stdout:
print(event.stdout, end="")
if event.stderr:
print(event.stderr, end="", file=sys.stderr)
if event.is_exited:
print(f"\nDone: exit code {event.exit_code}")
Interactive processes (stdin + signals)
process = sandbox.exec_start("bash")
process.write_stdin("echo hello\n")
process.write_stdin("exit\n")
process.close_stdin()
for event in process.output():
if event.stdout:
print(event.stdout, end="")
Send signals to running processes:
import signal
process = sandbox.exec_start("sleep", "300")
process.send_signal(signal.SIGTERM)
result = process.wait()
Options
All exec methods accept the same keyword arguments:
result = sandbox.exec(
"python", "train.py",
workdir="/app", # working directory
timeout_secs=3600, # kill after 1 hour
env={"CUDA_VISIBLE_DEVICES": "0"}, # environment variables
)
Examples
Clone a GitHub repo into a sandbox
from chalkcompute import SandboxClient
client = SandboxClient.from_env()
sandbox = client.create(image="ubuntu:latest")
# Install git
sandbox.exec("apt-get", "update")
sandbox.exec("apt-get", "install", "-y", "git")
# Clone
result = sandbox.exec(
"git", "clone", "https://github.com/chalk-ai/chalk.git", "/workspace/chalk"
)
if result.exit_code != 0:
print(f"Clone failed: {result.stderr_text}")
else:
# List what we got
result = sandbox.exec("ls", "-la", "/workspace/chalk")
for line in result.stdout:
print(line)
sandbox.terminate()
client.close()
Spawn an OpenCode agent in a sandbox
OpenCode is a terminal-based AI coding agent. You can run it inside a sandbox to give it an isolated environment to work in.
from chalkcompute import SandboxClient
client = SandboxClient.from_env()
sandbox = client.create(
image="ubuntu:latest",
cpu="2",
memory="4Gi",
env={
"ANTHROPIC_API_KEY": "sk-ant-...",
},
)
# Install dependencies
sandbox.exec("apt-get", "update")
sandbox.exec("apt-get", "install", "-y", "git", "curl", "build-essential")
# Install Go (opencode is a Go binary)
sandbox.exec("bash", "-c", "curl -fsSL https://go.dev/dl/go1.26.3.linux-amd64.tar.gz | tar -C /usr/local -xz")
sandbox.exec("bash", "-c", "echo 'export PATH=$PATH:/usr/local/go/bin:/root/go/bin' >> /root/.bashrc")
# Install opencode
sandbox.exec("bash", "-c", "export PATH=$PATH:/usr/local/go/bin:/root/go/bin && go install github.com/opencode-ai/opencode@latest")
# Clone a repo to work on
sandbox.exec("git", "clone", "https://github.com/your-org/your-repo.git", "/workspace/repo")
# Run opencode non-interactively with a prompt
result = sandbox.exec(
"bash", "-c",
"export PATH=$PATH:/usr/local/go/bin:/root/go/bin && cd /workspace/repo && opencode -p 'fix the failing tests in pkg/auth'",
timeout_secs=600,
)
print(result.stdout_text)
# Or run it interactively and feed it commands
process = sandbox.exec_start(
"bash", "-c",
"export PATH=$PATH:/usr/local/go/bin:/root/go/bin && cd /workspace/repo && opencode",
)
# Stream its output
for event in process.output():
if event.stdout:
print(event.stdout, end="")
if event.stderr:
print(event.stderr, end="", file=sys.stderr)
if event.is_exited:
break
sandbox.terminate()
client.close()
Long-running build with real-time output
from chalkcompute import SandboxClient
client = SandboxClient.from_env()
sandbox = client.create(image="node:25-trixie-slim")
sandbox.exec("git", "clone", "https://github.com/your-org/frontend.git", "/app")
sandbox.exec("npm", "install", workdir="/app")
# Stream the build output as it happens
for event in sandbox.exec_stream("npm", "run", "build", workdir="/app"):
if event.stdout:
print(event.stdout, end="")
if event.stderr:
print(event.stderr, end="", file=sys.stderr)
if event.is_exited and event.exit_code != 0:
print(f"Build failed with exit code {event.exit_code}")
sandbox.terminate()
client.close()
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