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skills/claude-agent-sdk/examples/plugin_example.py

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+#!/usr/bin/env python3
+"""Example demonstrating how to use plugins with Claude Code SDK.
+
+Plugins allow you to extend Claude Code with custom commands, agents, skills,
+and hooks. This example shows how to load a local plugin and verify it's
+loaded by checking the system message.
+
+The demo plugin is located in examples/plugins/demo-plugin/ and provides
+a custom /greet command.
+"""
+
+from pathlib import Path
+
+import anyio
+
+from claude_agent_sdk import (
+    ClaudeAgentOptions,
+    SystemMessage,
+    query,
+)
+
+
+async def plugin_example():
+    """Example showing plugins being loaded in the system message."""
+    print("=== Plugin Example ===\n")
+
+    # Get the path to the demo plugin
+    # In production, you can use any path to your plugin directory
+    plugin_path = Path(__file__).parent / "plugins" / "demo-plugin"
+
+    options = ClaudeAgentOptions(
+        plugins=[
+            {
+                "type": "local",
+                "path": str(plugin_path),
+            }
+        ],
+        max_turns=1,  # Limit to one turn for quick demo
+    )
+
+    print(f"Loading plugin from: {plugin_path}\n")
+
+    found_plugins = False
+    async for message in query(prompt="Hello!", options=options):
+        if isinstance(message, SystemMessage) and message.subtype == "init":
+            print("System initialized!")
+            print(f"System message data keys: {list(message.data.keys())}\n")
+
+            # Check for plugins in the system message
+            plugins_data = message.data.get("plugins", [])
+            if plugins_data:
+                print("Plugins loaded:")
+                for plugin in plugins_data:
+                    print(f"  - {plugin.get('name')} (path: {plugin.get('path')})")
+                found_plugins = True
+            else:
+                print("Note: Plugin was passed via CLI but may not appear in system message.")
+                print(f"Plugin path configured: {plugin_path}")
+                found_plugins = True
+
+    if found_plugins:
+        print("\nPlugin successfully configured!\n")
+
+
+async def main():
+    """Run all plugin examples."""
+    await plugin_example()
+
+
+if __name__ == "__main__":
+    anyio.run(main)