diff --git a/home/coding/agents/opencode.nix b/home/coding/agents/opencode.nix
index 6abed49..5f13825 100644
--- a/home/coding/agents/opencode.nix
+++ b/home/coding/agents/opencode.nix
@@ -49,6 +49,150 @@
       };
     };
 
+    # Security: permission hardening for OpenCode
+    # Last matching rule wins. Glob patterns: * = any chars, ? = single char.
+    # ~ and $HOME are expanded to the user's home directory.
+    # external_directory gates paths outside the working directory.
+    permission = {
+      # External directory access: ask by default, allow safe paths
+      "external_directory" = {
+        "*" = "ask";
+        "/nix/store/**" = "allow";
+        "/tmp/**" = "allow";
+      };
+
+      # Read access: allow by default, deny sensitive paths
+      "read" = {
+        "*" = "allow";
+        "~/.ssh/**" = "deny";
+        "~/.gnupg/**" = "deny";
+        "~/.aws/**" = "deny";
+        "~/.kube/**" = "deny";
+        "~/.config/gh/**" = "deny";
+        "~/.config/gcloud/**" = "deny";
+        "~/.config/op/**" = "deny";
+        "~/.config/sops/**" = "deny";
+        "/run/agenix/**" = "deny";
+        "~/.pi/agent/auth.json" = "deny";
+        "~/.pi/agent/sessions/**" = "deny";
+        "*.env" = "deny";
+        "*.env.*" = "deny";
+        "*.pem" = "deny";
+        "*.key" = "deny";
+        "*.p12" = "deny";
+        "*.pfx" = "deny";
+        "*id_rsa*" = "deny";
+        "*id_ed25519*" = "deny";
+        "*id_ecdsa*" = "deny";
+        "*.example.env" = "allow";
+        "*.sample.env" = "allow";
+        "*.test.env" = "allow";
+        ".env.example" = "allow";
+        ".env.sample" = "allow";
+        ".env.test" = "allow";
+        "~/.ssh/*.pub" = "allow";
+        "*.pub" = "allow";
+        "*.csr" = "allow";
+      };
+
+      # Edit access: ask by default, deny sensitive paths
+      "edit" = {
+        "*" = "ask";
+        "~/.ssh/**" = "deny";
+        "~/.gnupg/**" = "deny";
+        "~/.aws/**" = "deny";
+        "~/.kube/**" = "deny";
+        "~/.config/gh/**" = "deny";
+        "~/.config/gcloud/**" = "deny";
+        "~/.config/op/**" = "deny";
+        "~/.config/sops/**" = "deny";
+        "/run/agenix/**" = "deny";
+        "~/.pi/agent/auth.json" = "deny";
+        "~/.pi/agent/sessions/**" = "deny";
+        "*.env" = "deny";
+        "*.env.*" = "deny";
+        "*.pem" = "deny";
+        "*.key" = "deny";
+        "*.p12" = "deny";
+        "*.pfx" = "deny";
+        "*id_rsa*" = "deny";
+        "*id_ed25519*" = "deny";
+        "*id_ecdsa*" = "deny";
+        "~/.ssh/*.pub" = "allow";
+        "*.pub" = "allow";
+        "*.csr" = "allow";
+      };
+
+      # Glob patterns: same rules as read for file matching
+      "glob" = {
+        "*" = "allow";
+        "~/.ssh/**" = "deny";
+        "~/.gnupg/**" = "deny";
+        "/run/agenix/**" = "deny";
+        "*.env" = "deny";
+        "*.env.*" = "deny";
+        "*.pem" = "deny";
+        "*.key" = "deny";
+        "*.p12" = "deny";
+        "*.pfx" = "deny";
+      };
+
+      # Grep: allow search, but deny searching for secrets
+      "grep" = {
+        "*" = "allow";
+        "~/.ssh/**" = "deny";
+        "~/.gnupg/**" = "deny";
+        "/run/agenix/**" = "deny";
+        "*PASSWORD*" = "ask";
+        "*SECRET*" = "ask";
+        "*API_KEY*" = "ask";
+        "*PRIVATE_KEY*" = "ask";
+      };
+
+      # Bash: ask by default, deny dangerous and env-leak commands
+      "bash" = {
+        "*" = "ask";
+        "git status*" = "allow";
+        "git diff*" = "allow";
+        "git log*" = "allow";
+        "git branch*" = "allow";
+        "git show*" = "allow";
+        "git remote*" = "allow";
+        "nix --version" = "allow";
+        "nix eval*" = "allow";
+        "nix build*" = "allow";
+        "nix develop*" = "allow";
+        "nix shell*" = "allow";
+        "nix search*" = "allow";
+        "alejandra*" = "allow";
+        "git add*" = "allow";
+        "git commit*" = "allow";
+        "git push*" = "ask";
+        "git pull*" = "allow";
+        "rm *" = "ask";
+        "rm -rf *" = "deny";
+        "sudo *" = "ask";
+        "env" = "deny";
+        "printenv" = "deny";
+        "cat /proc/*/environ" = "deny";
+        "gpg *--export-secret*" = "deny";
+        "ssh-add -D" = "deny";
+        "docker run --privileged*" = "deny";
+        "curl *| *sh" = "deny";
+        "wget *| *sh" = "deny";
+      };
+
+      # Web fetch: ask for sensitive URLs
+      "webfetch" = {
+        "*" = "ask";
+        "https://api.github.com*" = "allow";
+        "https://search.nixos.org*" = "allow";
+      };
+
+      # Doom loop guard
+      "doom_loop" = "ask";
+    };
+
     # AZ-Gruppe LiteLLM endpoint + available models
     provider = {
       litellm = {
diff --git a/home/coding/agents/pi.nix b/home/coding/agents/pi.nix
index d08745a..2cada13 100644
--- a/home/coding/agents/pi.nix
+++ b/home/coding/agents/pi.nix
@@ -54,6 +54,216 @@
       defaultThinkingLevel = "high";
     };
 
+    # pi-guardrails: strict security config
+    # NOTE: Path access checks are lexical (not symlink-safe).
+    # NOTE: Local project .pi/extensions/guardrails.json can override same rule IDs.
+    #       For immutable global policies, consider a wrapper or upstream patch.
+    guardrails = {
+      enable = true;
+      config = {
+        enabled = true;
+        applyBuiltinDefaults = true;
+
+        onboarding = {
+          completed = true;
+        };
+
+        features = {
+          policies = true;
+          permissionGate = true;
+          pathAccess = true;
+        };
+
+        pathAccess = {
+          mode = "ask";
+          allowedPaths = [
+            "/nix/store/"
+            "/tmp/"
+          ];
+        };
+
+        policies = {
+          rules = [
+            # ── SSH keys ───────────────────────────────────────────
+            {
+              id = "home-ssh";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "~/.ssh/**";}
+                {pattern = "~/.ssh/*_rsa";}
+                {pattern = "~/.ssh/*_ed25519";}
+                {pattern = "~/.ssh/*.pem";}
+              ];
+              allowedPatterns = [
+                {pattern = "~/.ssh/*.pub";}
+              ];
+            }
+
+            # ── GPG keys ─────────────────────────────────────────
+            {
+              id = "home-gpg";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "~/.gnupg/**";}
+                {pattern = "~/*.gpg";}
+                {pattern = "~/.gpg-agent.conf";}
+              ];
+            }
+
+            # ── AWS credentials ────────────────────────────────────
+            {
+              id = "home-aws";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "~/.aws/**";}
+                {pattern = "~/.aws/credentials";}
+                {pattern = "~/.aws/config";}
+              ];
+            }
+
+            # ── Kubernetes configs ────────────────────────────────
+            {
+              id = "home-kube";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "~/.kube/**";}
+                {pattern = "*kubeconfig*";}
+              ];
+            }
+
+            # ── Cloud CLI configs ────────────────────────────────
+            {
+              id = "home-config";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "~/.config/gh/**";}
+                {pattern = "~/.config/gcloud/**";}
+                {pattern = "~/.config/op/**";}
+                {pattern = "~/.config/sops/**";}
+              ];
+            }
+
+            # ── agenix secrets ───────────────────────────────────
+            {
+              id = "agenix-secrets";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "/run/agenix/**";}
+              ];
+            }
+
+            # ── Pi auth and sessions ────────────────────────────
+            {
+              id = "pi-auth-sessions";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "~/.pi/agent/auth.json";}
+                {pattern = "~/.pi/agent/sessions/**";}
+              ];
+            }
+
+            # ── Environment files ─────────────────────────────────
+            {
+              id = "secret-files";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = true;
+              patterns = [
+                {pattern = ".env";}
+                {pattern = ".env.*";}
+                {pattern = ".dev.vars";}
+              ];
+              allowedPatterns = [
+                {pattern = "*.example.env";}
+                {pattern = "*.sample.env";}
+                {pattern = "*.test.env";}
+                {pattern = ".env.example";}
+                {pattern = ".env.sample";}
+                {pattern = ".env.test";}
+              ];
+            }
+
+            # ── Private keys and certificates ───────────────────
+            {
+              id = "private-keys";
+              enabled = true;
+              protection = "noAccess";
+              onlyIfExists = false;
+              patterns = [
+                {pattern = "*.pem";}
+                {pattern = "*.key";}
+                {pattern = "*.p12";}
+                {pattern = "*.pfx";}
+                {pattern = "*id_rsa*";}
+                {pattern = "*id_ed25519*";}
+                {pattern = "*id_ecdsa*";}
+              ];
+              allowedPatterns = [
+                {pattern = "*.pub";}
+                {pattern = "*.csr";}
+              ];
+            }
+          ];
+        };
+
+        permissionGate = {
+          explainCommands = false;
+          # Auto-deny patterns: env leakage and credential dumping
+          autoDenyPatterns = [
+            {
+              pattern = "\\benv\\b";
+              regex = true;
+              description = "env command (may dump environment)";
+            }
+            {
+              pattern = "\\bprintenv\\b";
+              regex = true;
+              description = "printenv command (dumps environment variables)";
+            }
+            {
+              pattern = "/proc/[0-9]+/environ";
+              regex = true;
+              description = "reading process environment files";
+            }
+            {
+              pattern = "gpg\\s+--export-secret-keys";
+              regex = true;
+              description = "GPG secret key export";
+            }
+            {
+              pattern = "gpg\\s+--export-secret-subkeys";
+              regex = true;
+              description = "GPG secret subkey export";
+            }
+            {
+              pattern = "ssh-add\\s+-D";
+              regex = true;
+              description = "delete all SSH identities";
+            }
+            {
+              pattern = "\\b(op|pass)\\s+(read|show|get)";
+              regex = true;
+              description = "password manager read operations";
+            }
+          ];
+        };
+      };
+    };
+
     # MCP servers auto-inherited from programs.mcp in default.nix
   };
 }