diff --git a/.gitignore b/.gitignore
index e69de29..dda707e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,123 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+Pipfile.lock
+
+# PEP 582
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
\ No newline at end of file
diff --git a/README.md b/README.md
index d1ca75f..f404b2e 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,12 @@ the host.
 
 - Arch Linux–based image
 - Runs as the host user (same username, UID, GID)
+- **Per-project isolation**: Each project gets its own container (identified by project path hash)
+- **Shared persistent home**: All containers mount the same home directory from XDG_DATA_HOME, allowing tools to persist across projects
+- **Sudo access**: OpenCode agent can install project-specific dependencies that persist in the stopped container
+- **Hard linking support**: Can hard link files like `~/.gitconfig` to share configurations with containers
 - Mounts only the current project directory (same absolute path inside container)
-- Persists OpenCode state in XDG_DATA_HOME/opencode-container/container-home directory
-- No access to SSH keys, passwords, or full `$HOME`
+- **Security boundary**: No access to SSH keys, passwords, or full `$HOME` (intentionally prevents remote code pushes)
 - Simple shell function (`opencode`) to launch interactively
 
 ## Install
diff --git a/opencode-container.py b/opencode-container.py
index 84a7919..2419caa 100755
--- a/opencode-container.py
+++ b/opencode-container.py
@@ -1,12 +1,20 @@
 #!/usr/bin/env python3
 
 import hashlib
+import logging
 import os
 import subprocess
 import sys
 import time
 from pathlib import Path
 
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(message)s',
+    stream=sys.stderr
+)
+logger = logging.getLogger(__name__)
+
 
 class OpenCodeContainer:
     IMAGE = "opencode-container:latest"
@@ -45,6 +53,14 @@ class OpenCodeContainer:
         # Ensure container home directory exists
         self.container_home_path.mkdir(parents=True, exist_ok=True)
 
+        # Check if this project already has a running container
+        if self.container_exists() and self.container_running():
+            logger.error(f"Project '{self.project_path.name}' already has a running OpenCode container.")
+            logger.error(f"Container name: {self.container_name}")
+            logger.error("Wait for the current instance to finish or manually stop it with:")
+            logger.error(f"  docker stop {self.container_name}")
+            sys.exit(1)
+
         # Pre-create project directory structure to prevent root-owned directories
         try:
             relative_path = self.project_path.relative_to(Path.home())
@@ -60,7 +76,7 @@ class OpenCodeContainer:
             self.create_container()
 
         if not self.start_container():
-            print("Recreating container due to failed start")
+            logger.warning("Recreating container due to failed start")
             self.remove_container()
             self.create_container()
             if not self.start_container():
@@ -83,7 +99,7 @@ class OpenCodeContainer:
         ).returncode == 0
 
     def build_image(self) -> None:
-        print(f"Building image '{self.IMAGE}' with user {self.host_username} ({self.host_uid}:{self.host_gid})")
+        logger.info(f"Building image '{self.IMAGE}' with user {self.host_username} ({self.host_uid}:{self.host_gid})")
         self._run([
             "docker", "build",
             "--build-arg", f"USERNAME={self.host_username}",
@@ -98,7 +114,7 @@ class OpenCodeContainer:
     # =========================
 
     def create_container(self) -> None:
-        print(f"Creating container '{self.container_name}'")
+        logger.info(f"Creating container '{self.container_name}'")
 
         self._run([
             "docker", "create",