diff --git a/Dockerfile b/Dockerfile
index dd98ec0bd..0360cfda6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,7 +29,14 @@ HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
 # Copy binary
 COPY --from=builder /src/build/picoclaw /usr/local/bin/picoclaw
 
-# Create picoclaw home directory
+# Create non-root user and group
+RUN addgroup -g 1000 picoclaw && \
+    adduser -D -u 1000 -G picoclaw picoclaw
+
+# Switch to non-root user
+USER picoclaw
+
+# Run onboard to create initial directories and config
 RUN /usr/local/bin/picoclaw onboard
 
 ENTRYPOINT ["picoclaw"]
diff --git a/docker-compose.yml b/docker-compose.yml
index 48769627c..32e8ee339 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -11,8 +11,8 @@ services:
     profiles:
       - agent
     volumes:
-      - ./config/config.json:/root/.picoclaw/config.json:ro
-      - picoclaw-workspace:/root/.picoclaw/workspace
+      - ./config/config.json:/home/picoclaw/.picoclaw/config.json:ro
+      - picoclaw-workspace:/home/picoclaw/.picoclaw/workspace
     entrypoint: ["picoclaw", "agent"]
     stdin_open: true
     tty: true
@@ -31,9 +31,9 @@ services:
       - gateway
     volumes:
       # Configuration file
-      - ./config/config.json:/root/.picoclaw/config.json:ro
+      - ./config/config.json:/home/picoclaw/.picoclaw/config.json:ro
       # Persistent workspace (sessions, memory, logs)
-      - picoclaw-workspace:/root/.picoclaw/workspace
+      - picoclaw-workspace:/home/picoclaw/.picoclaw/workspace
     command: ["gateway"]
 
 volumes:
diff --git a/pkg/tools/shell.go b/pkg/tools/shell.go
index 713850f97..9c82b2748 100644
--- a/pkg/tools/shell.go
+++ b/pkg/tools/shell.go
@@ -31,6 +31,40 @@ func NewExecTool(workingDir string, restrict bool) *ExecTool {
 		regexp.MustCompile(`>\s*/dev/sd[a-z]\b`), // Block writes to disk devices (but allow /dev/null)
 		regexp.MustCompile(`\b(shutdown|reboot|poweroff)\b`),
 		regexp.MustCompile(`:\(\)\s*\{.*\};\s*:`),
+		regexp.MustCompile(`\$\([^)]+\)`),
+		regexp.MustCompile(`\$\{[^}]+\}`),
+		regexp.MustCompile("`[^`]+`"),
+		regexp.MustCompile(`\|\s*sh\b`),
+		regexp.MustCompile(`\|\s*bash\b`),
+		regexp.MustCompile(`;\s*rm\s+-[rf]`),
+		regexp.MustCompile(`&&\s*rm\s+-[rf]`),
+		regexp.MustCompile(`\|\|\s*rm\s+-[rf]`),
+		regexp.MustCompile(`>\s*/dev/null\s*>&?\s*\d?`),
+		regexp.MustCompile(`<<\s*EOF`),
+		regexp.MustCompile(`\$\(\s*cat\s+`),
+		regexp.MustCompile(`\$\(\s*curl\s+`),
+		regexp.MustCompile(`\$\(\s*wget\s+`),
+		regexp.MustCompile(`\$\(\s*which\s+`),
+		regexp.MustCompile(`\bsudo\b`),
+		regexp.MustCompile(`\bchmod\s+[0-7]{3,4}\b`),
+		regexp.MustCompile(`\bchown\b`),
+		regexp.MustCompile(`\bpkill\b`),
+		regexp.MustCompile(`\bkillall\b`),
+		regexp.MustCompile(`\bkill\s+-[9]\b`),
+		regexp.MustCompile(`\bcurl\b.*\|\s*(sh|bash)`),
+		regexp.MustCompile(`\bwget\b.*\|\s*(sh|bash)`),
+		regexp.MustCompile(`\bnpm\s+install\s+-g\b`),
+		regexp.MustCompile(`\bpip\s+install\s+--user\b`),
+		regexp.MustCompile(`\bapt\s+(install|remove|purge)\b`),
+		regexp.MustCompile(`\byum\s+(install|remove)\b`),
+		regexp.MustCompile(`\bdnf\s+(install|remove)\b`),
+		regexp.MustCompile(`\bdocker\s+run\b`),
+		regexp.MustCompile(`\bdocker\s+exec\b`),
+		regexp.MustCompile(`\bgit\s+push\b`),
+		regexp.MustCompile(`\bgit\s+force\b`),
+		regexp.MustCompile(`\bssh\b.*@`),
+		regexp.MustCompile(`\beval\b`),
+		regexp.MustCompile(`\bsource\s+.*\.sh\b`),
 	}
 
 	return &ExecTool{