fix: Remove violation mode

config/cobra.go

@@ -23,8 +23,6 @@ func ApplyCobraFlags(cmd *cobra.Command) {
 		globalConfig.Config.ExperimentalProxyMode, "Use experimental proxy-based interception (EXPERIMENTAL)")
 	cmd.PersistentFlags().BoolVar(&globalConfig.Config.Sandbox.Enabled, "sandbox",
 		globalConfig.Config.Sandbox.Enabled, "Enable sandbox mode to isolate package manager processes (EXPERIMENTAL)")
-	cmd.PersistentFlags().StringVar(&globalConfig.Config.Sandbox.ViolationMode, "sandbox-violation-mode",
-		globalConfig.Config.Sandbox.ViolationMode, "How to handle sandbox policy violations: block, warn, or allow")
 	cmd.PersistentFlags().StringVar(&globalConfig.SandboxProfileOverride, "sandbox-profile",
 		globalConfig.SandboxProfileOverride, "Override sandbox policy profile (built-in name or path to custom YAML)")
 }

config/config.go

@@ -70,9 +70,6 @@ type SandboxConfig struct {
 	// Enabled enables sandbox mode (opt-in by default for backward compatibility).
 	Enabled bool `mapstructure:"enabled"`
 
-	// ViolationMode defines how policy violations are handled (block, warn, or allow).
-	ViolationMode string `mapstructure:"violation_mode"`
-
 	// Policies maps package manager names to their sandbox policy references.
 	// Key is package manager name (e.g., "npm", "pip"), value is policy reference.
 	Policies map[string]SandboxPolicyRef `mapstructure:"policies"`

config/config.template.yml

@@ -52,6 +52,8 @@ trusted_packages:
 # filesystem, network, and process execution access. This provides defense-in-depth
 # protection against malicious install scripts and supply chain attacks.
 #
+# Policy violations will block execution (this is the only supported behavior).
+#
 # Currently supported platforms:
 # - macOS (using Seatbelt sandbox-exec)
 # - Linux (coming soon: Bubblewrap or seccomp-bpf)
@@ -60,12 +62,6 @@ sandbox:
   # Enable sandbox mode (opt-in, default: false for backward compatibility)
   enabled: false
 
-  # How to handle policy violations: block | warn | allow
-  # - block: Prevent execution on policy violation (recommended)
-  # - warn: Log warning but allow execution
-  # - allow: Allow all operations (disables sandbox)
-  violation_mode: block
-
   # Per-package-manager sandbox policies
   # Each package manager can have its own policy to account for unique security characteristics
   policies:

sandbox/policy.go

@@ -7,11 +7,11 @@ import (
 
 // SandboxPolicy represents a parsed and validated sandbox policy that defines
 // filesystem, network, and process execution restrictions for package managers.
+// Policy violations will block execution.
 type SandboxPolicy struct {
 	Name            string           `yaml:"name" json:"name"`
 	Description     string           `yaml:"description" json:"description"`
 	PackageManagers []string         `yaml:"package_managers" json:"package_managers"`
-	ViolationMode   string           `yaml:"violation_mode" json:"violation_mode"`
 	Filesystem      FilesystemPolicy `yaml:"filesystem" json:"filesystem"`
 	Network         NetworkPolicy    `yaml:"network" json:"network"`
 	Process         ProcessPolicy    `yaml:"process" json:"process"`
@@ -40,46 +40,6 @@ type ProcessPolicy struct {
 	DenyExec  []string `yaml:"deny_exec" json:"deny_exec"`
 }
 
-// ViolationMode represents how sandbox policy violations are handled.
-type ViolationMode int
-
-const (
-	// ViolationModeBlock blocks execution when a policy violation is detected (default).
-	ViolationModeBlock ViolationMode = iota
-	// ViolationModeWarn logs a warning but allows execution to continue.
-	ViolationModeWarn
-	// ViolationModeAllow allows all operations (effectively disables the sandbox).
-	ViolationModeAllow
-)
-
-// String returns the string representation of the violation mode.
-func (v ViolationMode) String() string {
-	switch v {
-	case ViolationModeBlock:
-		return "block"
-	case ViolationModeWarn:
-		return "warn"
-	case ViolationModeAllow:
-		return "allow"
-	default:
-		return "unknown"
-	}
-}
-
-// ParseViolationMode parses a violation mode string into a ViolationMode value.
-func ParseViolationMode(s string) (ViolationMode, error) {
-	switch strings.ToLower(s) {
-	case "block":
-		return ViolationModeBlock, nil
-	case "warn":
-		return ViolationModeWarn, nil
-	case "allow":
-		return ViolationModeAllow, nil
-	default:
-		return ViolationModeBlock, fmt.Errorf("invalid violation mode: %s (must be block, warn, or allow)", s)
-	}
-}
-
 // Validate validates the sandbox policy for correctness.
 // Returns an error if the policy is invalid.
 func (p *SandboxPolicy) Validate() error {
@@ -91,12 +51,6 @@ func (p *SandboxPolicy) Validate() error {
 		return fmt.Errorf("policy must specify at least one package manager")
 	}
 
-	if p.ViolationMode != "" {
-		if _, err := ParseViolationMode(p.ViolationMode); err != nil {
-			return fmt.Errorf("invalid violation mode: %w", err)
-		}
-	}
-
 	hasRules := len(p.Filesystem.AllowRead) > 0 ||
 		len(p.Filesystem.AllowWrite) > 0 ||
 		len(p.Filesystem.DenyRead) > 0 ||
@@ -113,20 +67,6 @@ func (p *SandboxPolicy) Validate() error {
 	return nil
 }
 
-// GetViolationMode returns the parsed violation mode for the policy.
-func (p *SandboxPolicy) GetViolationMode() ViolationMode {
-	if p.ViolationMode == "" {
-		return ViolationModeBlock
-	}
-
-	mode, err := ParseViolationMode(p.ViolationMode)
-	if err != nil {
-		return ViolationModeBlock
-	}
-
-	return mode
-}
-
 // AppliesToPackageManager returns true if this policy applies to the given package manager.
 func (p *SandboxPolicy) AppliesToPackageManager(pm string) bool {
 	pmLower := strings.ToLower(pm)

sandbox/profiles/README.md

@@ -39,8 +39,6 @@ See the [Policy Schema Documentation](../policy.go) for details on the YAML stru
 - `${CWD}`: Current working directory
 - `${TMPDIR}`: Temporary directory
 
-### Violation Modes
+## Policy Enforcement
 
-- `block`: Block execution on policy violation (recommended)
+All policy violations will block execution. This provides defense-in-depth protection against malicious install scripts and supply chain attacks.
-- `warn`: Log warning but allow execution
-- `allow`: Allow all operations (disables sandbox)

sandbox/profiles/npm-restrictive.yml

@@ -6,8 +6,6 @@ package_managers:
   - yarn
   - bun
 
-violation_mode: block
-
 filesystem:
   allow_read:
     - ${CWD}/**

sandbox/profiles/pypi-restrictive.yml

@@ -6,8 +6,6 @@ package_managers:
   - poetry
   - uv
 
-violation_mode: block
-
 filesystem:
   allow_read:
     - ${CWD}/**