feat: Customizing the sandbox environment

docs/developers/tools/_meta.ts

@@ -10,4 +10,5 @@ export default {
   'web-search': 'Web Search',
   memory: 'Memory',
   'mcp-server': 'MCP Servers',
+  sandbox: 'Sandboxing',
 };

docs/developers/tools/sandbox.md

@@ -0,0 +1,13 @@
+## Customizing the sandbox environment (Docker/Podman)
+
+If you need extra tools inside the container (e.g., `git`, `python`, `rg`), create a custom Dockerfile:
+
+1. `cd packages/cli`
+2. `npm link`
+3. `which qwen`
+4. `cd your-project`
+
+- Path: `.qwen/sandbox.Dockerfile`
+- Then run with: `BUILD_SANDBOX=1 qwen -s ...`
+
+This builds a project-specific image based on the default sandbox image.