diff --git a/actions/artifact_demo.py b/actions/artifact_demo.py
new file mode 100644
index 0000000..1476058
--- /dev/null
+++ b/actions/artifact_demo.py
@@ -0,0 +1,294 @@
+#!/usr/bin/env python3
+"""
+Artifact Demo Action - Python Example Pack
+
+Demonstrates creating file and progress artifacts via the Attune API.
+Each iteration:
+  1. Appends a timestamped log line to a file artifact (via version upload)
+  2. Updates a progress artifact by 2%
+  3. Sleeps for 0.5 seconds
+
+The action authenticates to the API using the provided credentials (or defaults)
+and uses ATTUNE_API_URL / ATTUNE_EXEC_ID environment variables set by the worker.
+"""
+
+import json
+import os
+import sys
+import time
+import urllib.error
+import urllib.request
+from datetime import datetime, timezone
+
+
+def api_request(
+    base_url, path, method="GET", data=None, token=None, content_type="application/json"
+):
+    """Make an HTTP request to the Attune API."""
+    url = f"{base_url}{path}"
+    headers = {"Accept": "application/json"}
+    if token:
+        headers["Authorization"] = f"Bearer {token}"
+
+    body = None
+    if data is not None:
+        if content_type == "application/json":
+            body = json.dumps(data).encode("utf-8")
+            headers["Content-Type"] = "application/json"
+        else:
+            body = data if isinstance(data, bytes) else data.encode("utf-8")
+            headers["Content-Type"] = content_type
+
+    req = urllib.request.Request(url, data=body, headers=headers, method=method)
+    try:
+        with urllib.request.urlopen(req, timeout=30) as resp:
+            return json.loads(resp.read().decode("utf-8")), resp.status
+    except urllib.error.HTTPError as e:
+        error_body = e.read().decode("utf-8", errors="replace")
+        print(f"API error {e.code} on {method} {path}: {error_body}", file=sys.stderr)
+        raise
+
+
+def multipart_upload(
+    base_url, path, file_bytes, filename, token, content_type="text/plain"
+):
+    """Upload a file via multipart/form-data."""
+    boundary = f"----AttuneArtifact{int(time.time() * 1000)}"
+    body_parts = []
+
+    # file field
+    body_parts.append(f"--{boundary}\r\n".encode())
+    body_parts.append(
+        f'Content-Disposition: form-data; name="file"; filename="{filename}"\r\n'.encode()
+    )
+    body_parts.append(f"Content-Type: {content_type}\r\n\r\n".encode())
+    body_parts.append(file_bytes)
+    body_parts.append(b"\r\n")
+
+    # content_type field
+    body_parts.append(f"--{boundary}\r\n".encode())
+    body_parts.append(b'Content-Disposition: form-data; name="content_type"\r\n\r\n')
+    body_parts.append(content_type.encode())
+    body_parts.append(b"\r\n")
+
+    # created_by field
+    body_parts.append(f"--{boundary}\r\n".encode())
+    body_parts.append(b'Content-Disposition: form-data; name="created_by"\r\n\r\n')
+    body_parts.append(b"python_example.artifact_demo")
+    body_parts.append(b"\r\n")
+
+    body_parts.append(f"--{boundary}--\r\n".encode())
+
+    full_body = b"".join(body_parts)
+
+    url = f"{base_url}{path}"
+    headers = {
+        "Authorization": f"Bearer {token}",
+        "Content-Type": f"multipart/form-data; boundary={boundary}",
+        "Accept": "application/json",
+    }
+
+    req = urllib.request.Request(url, data=full_body, headers=headers, method="POST")
+    try:
+        with urllib.request.urlopen(req, timeout=30) as resp:
+            return json.loads(resp.read().decode("utf-8")), resp.status
+    except urllib.error.HTTPError as e:
+        error_body = e.read().decode("utf-8", errors="replace")
+        print(f"Upload error {e.code} on {path}: {error_body}", file=sys.stderr)
+        raise
+
+
+def login(base_url, username, password):
+    """Authenticate and return a JWT token."""
+    data, _ = api_request(
+        base_url,
+        "/auth/login",
+        method="POST",
+        data={
+            "username": username,
+            "password": password,
+        },
+    )
+    return data["data"]["access_token"]
+
+
+def create_artifact(
+    base_url,
+    token,
+    ref,
+    name,
+    artifact_type,
+    execution_id,
+    content_type=None,
+    description=None,
+    data=None,
+):
+    """Create a new artifact and return its ID."""
+    payload = {
+        "ref": ref,
+        "scope": "action",
+        "owner": "python_example.artifact_demo",
+        "type": artifact_type,
+        "retention_policy": "versions",
+        "retention_limit": 10,
+        "name": name,
+        "execution": execution_id,
+    }
+    if content_type:
+        payload["content_type"] = content_type
+    if description:
+        payload["description"] = description
+    if data is not None:
+        payload["data"] = data
+
+    resp, _ = api_request(
+        base_url, "/api/v1/artifacts", method="POST", data=payload, token=token
+    )
+    return resp["data"]["id"]
+
+
+def append_progress(base_url, token, artifact_id, entry):
+    """Append an entry to a progress artifact."""
+    api_request(
+        base_url,
+        f"/api/v1/artifacts/{artifact_id}/progress",
+        method="POST",
+        data={"entry": entry},
+        token=token,
+    )
+
+
+def main():
+    start_time = time.time()
+
+    try:
+        # Read parameters from stdin (JSON format)
+        params = json.loads(sys.stdin.readline())
+        iterations = params.get("iterations", 50)
+        username = params.get("username") or os.environ.get(
+            "ATTUNE_USERNAME", "test@attune.local"
+        )
+        password = params.get("password") or os.environ.get(
+            "ATTUNE_PASSWORD", "TestPass123!"
+        )
+
+        # Get execution context from environment
+        api_url = os.environ.get("ATTUNE_API_URL", "http://localhost:8080")
+        exec_id_str = os.environ.get("ATTUNE_EXEC_ID", "")
+        execution_id = int(exec_id_str) if exec_id_str else None
+
+        print(
+            f"Artifact demo starting: {iterations} iterations, API at {api_url}",
+            file=sys.stderr,
+        )
+
+        # Authenticate
+        token = login(api_url, username, password)
+        print("Authenticated successfully", file=sys.stderr)
+
+        # Build unique artifact refs using execution ID to avoid collisions
+        ts = int(time.time())
+        ref_suffix = f"{execution_id}_{ts}" if execution_id else str(ts)
+        file_ref = f"python_example.artifact_demo.log.{ref_suffix}"
+        progress_ref = f"python_example.artifact_demo.progress.{ref_suffix}"
+
+        # Create file artifact (file_text type)
+        file_artifact_id = create_artifact(
+            base_url=api_url,
+            token=token,
+            ref=file_ref,
+            name="Artifact Demo Log",
+            artifact_type="file_text",
+            execution_id=execution_id,
+            content_type="text/plain",
+            description=f"Log output from artifact demo ({iterations} iterations)",
+        )
+        print(
+            f"Created file artifact ID={file_artifact_id} ref={file_ref}",
+            file=sys.stderr,
+        )
+
+        # Create progress artifact
+        progress_artifact_id = create_artifact(
+            base_url=api_url,
+            token=token,
+            ref=progress_ref,
+            name="Artifact Demo Progress",
+            artifact_type="progress",
+            execution_id=execution_id,
+            description=f"Progress tracker for artifact demo ({iterations} iterations)",
+            data=[],  # Initialize with empty array
+        )
+        print(
+            f"Created progress artifact ID={progress_artifact_id} ref={progress_ref}",
+            file=sys.stderr,
+        )
+
+        # Run iterations
+        log_lines = []
+        for i in range(iterations):
+            iteration = i + 1
+            now = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%S.%fZ")
+            pct = min(round(iteration * (100.0 / iterations), 1), 100.0)
+
+            # Build log line
+            log_line = f"[{now}] Iteration {iteration}/{iterations} — progress {pct}%"
+            log_lines.append(log_line)
+
+            print(f"  Iteration {iteration}/{iterations} ({pct}%)", file=sys.stderr)
+
+            # Upload the full log as a new file version
+            full_log = "\n".join(log_lines) + "\n"
+            multipart_upload(
+                base_url=api_url,
+                path=f"/api/v1/artifacts/{file_artifact_id}/versions/upload",
+                file_bytes=full_log.encode("utf-8"),
+                filename="artifact_demo.log",
+                token=token,
+                content_type="text/plain",
+            )
+
+            # Append progress entry
+            append_progress(
+                api_url,
+                token,
+                progress_artifact_id,
+                {
+                    "iteration": iteration,
+                    "total": iterations,
+                    "percent": pct,
+                    "message": f"Completed iteration {iteration}",
+                    "timestamp": now,
+                },
+            )
+
+            # Sleep between iterations
+            if iteration < iterations:
+                time.sleep(0.5)
+
+        elapsed = round(time.time() - start_time, 3)
+        result = {
+            "file_artifact_id": file_artifact_id,
+            "progress_artifact_id": progress_artifact_id,
+            "iterations_completed": iterations,
+            "elapsed_seconds": elapsed,
+            "success": True,
+        }
+        print(json.dumps(result))
+        print(f"Artifact demo completed in {elapsed}s", file=sys.stderr)
+        return 0
+
+    except Exception as e:
+        elapsed = round(time.time() - start_time, 3)
+        error_result = {
+            "success": False,
+            "error": str(e),
+            "elapsed_seconds": elapsed,
+        }
+        print(json.dumps(error_result))
+        print(f"ERROR: {e}", file=sys.stderr)
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/actions/artifact_demo.yaml b/actions/artifact_demo.yaml
new file mode 100644
index 0000000..11d3ae3
--- /dev/null
+++ b/actions/artifact_demo.yaml
@@ -0,0 +1,68 @@
+# Artifact Demo Action
+# Demonstrates creating file and progress artifacts via the Attune API
+
+ref: python_example.artifact_demo
+label: "Artifact Demo"
+description: "Creates a file artifact and a progress artifact, writing lines and updating progress over multiple iterations"
+enabled: true
+
+# Runner type determines how the action is executed
+runner_type: python
+
+# Minimum Python version required (semver constraint)
+runtime_version: ">=3.9"
+
+# Entry point is the Python script to execute
+entry_point: artifact_demo.py
+
+# Parameter delivery: stdin for secure parameter passing
+parameter_delivery: stdin
+parameter_format: json
+
+# Output format: json (structured data parsing enabled)
+output_format: json
+
+# Action parameters schema (flat format with inline required/secret)
+parameters:
+  iterations:
+    type: integer
+    description: "Number of iterations to run (each adds a log line and 2% progress)"
+    default: 50
+    minimum: 1
+    maximum: 200
+  username:
+    type: string
+    description: "API username for authentication (defaults to ATTUNE_USERNAME env var or test@attune.local)"
+    default: "test@attune.local"
+  password:
+    type: string
+    description: "API password for authentication (defaults to ATTUNE_PASSWORD env var or TestPass123!)"
+    secret: true
+    default: "TestPass123!"
+
+# Output schema (flat format)
+output_schema:
+  file_artifact_id:
+    type: integer
+    description: "ID of the created file artifact"
+    required: true
+  progress_artifact_id:
+    type: integer
+    description: "ID of the created progress artifact"
+    required: true
+  iterations_completed:
+    type: integer
+    description: "Number of iterations completed"
+    required: true
+  success:
+    type: boolean
+    description: "Whether the demo completed successfully"
+    required: true
+
+# Tags for categorization
+tags:
+  - python
+  - example
+  - artifacts
+  - progress
+  - demo