Add docker bind mounds for sandboxing

docs/gateway/configuration.md

@@ -1606,7 +1606,8 @@ Legacy: `perSession` is still supported (`true` → `scope: "session"`,
           seccompProfile: "/path/to/seccomp.json",
           apparmorProfile: "clawdbot-sandbox",
           dns: ["1.1.1.1", "8.8.8.8"],
-          extraHosts: ["internal.service:10.0.0.5"]
+          extraHosts: ["internal.service:10.0.0.5"],
+          binds: ["/var/run/docker.sock:/var/run/docker.sock", "/home/user/source:/source:rw"]
         },
         browser: {
           enabled: false,
@@ -1652,6 +1653,8 @@ to `"bridge"` (or your custom network) if the agent needs outbound access.
 
 Note: inbound attachments are staged into the active workspace at `media/inbound/*`. With `workspaceAccess: "rw"`, that means files are written into the agent workspace.
 
+Note: `docker.binds` mounts additional host directories; global and per-agent binds are merged.
+
 Build the optional browser image with:
 ```bash
 scripts/sandbox-browser-setup.sh

docs/gateway/sandboxing.md

@@ -56,6 +56,12 @@ Clawdbot mirrors eligible skills into the sandbox workspace (`.../skills`) so
 they can be read. With `"rw"`, workspace skills are readable from
 `/workspace/skills`.
 
+## Custom bind mounts
+`agents.defaults.sandbox.docker.binds` mounts additional host directories into the container.
+Format: `host:container:mode` (e.g., `"/home/user/source:/source:rw"`).
+
+Global and per-agent binds are **merged** (not replaced). Under `scope: "shared"`, per-agent binds are ignored.
+
 ## Images + setup
 Default image: `clawdbot-sandbox:bookworm-slim`