diff --git a/cmd/rdev-api/openapi.go b/cmd/rdev-api/openapi.go
index 77a986a..8908e90 100644
--- a/cmd/rdev-api/openapi.go
+++ b/cmd/rdev-api/openapi.go
@@ -177,6 +177,83 @@ func registerProjectPaths(spec *api.OpenAPISpec) {
 		"projects:read",
 		[]param{{Name: "id", In: "path", Description: "Project ID (e.g., 'pantheon')", Required: true}},
 	))
+
+	spec.AddPath("/projects/cleanup", "delete", map[string]any{
+		"summary": "Cleanup test projects",
+		"description": `Deletes test projects matching the given name patterns that are older than a specified age.
+
+This is useful for cleaning up orphaned test projects created by cookbook scripts.
+
+**Required scope**: ` + "`admin`" + `
+
+## Pattern Syntax
+
+Patterns support shell-style globs with ` + "`*`" + ` wildcards:
+- ` + "`tree-test-*`" + ` matches ` + "`tree-test-123456`" + `
+- ` + "`landing-test-*`" + ` matches ` + "`landing-test-1706889600`" + `
+- ` + "`*-validation-*`" + ` matches ` + "`template-validation-abc`" + `
+
+## Safety
+
+- Use ` + "`dry_run: true`" + ` first to preview what would be deleted
+- Only projects older than ` + "`older_than_hours`" + ` are affected
+- Git repos are preserved; only K8s resources and DB records are removed`,
+		"tags": []string{"Projects"},
+		"security": []map[string]any{
+			{"ApiKeyAuth": []string{}},
+		},
+		"requestBody": map[string]any{
+			"required": true,
+			"content": map[string]any{
+				"application/json": map[string]any{
+					"schema": map[string]any{
+						"type":     "object",
+						"required": []string{"patterns"},
+						"properties": map[string]any{
+							"patterns": map[string]any{
+								"type":        "array",
+								"items":       map[string]any{"type": "string"},
+								"description": "Name patterns to match (e.g., \"tree-test-*\", \"landing-test-*\")",
+								"example":     []string{"tree-test-*", "landing-test-*", "template-validation-*"},
+							},
+							"older_than_hours": map[string]any{
+								"type":        "integer",
+								"description": "Only delete projects older than this many hours (default: 0)",
+								"example":     1,
+							},
+							"dry_run": map[string]any{
+								"type":        "boolean",
+								"description": "If true, don't actually delete, just return what would be deleted",
+								"example":     true,
+							},
+						},
+					},
+					"example": `{
+  "patterns": ["tree-test-*", "landing-test-*", "template-validation-*"],
+  "older_than_hours": 1,
+  "dry_run": true
+}`,
+				},
+			},
+		},
+		"responses": map[string]any{
+			"200": map[string]any{
+				"description": "Success",
+				"content": map[string]any{
+					"application/json": map[string]any{
+						"example": `{
+  "deleted": ["tree-test-1706889600", "landing-test-1706889601"],
+  "count": 2,
+  "dry_run": true
+}`,
+					},
+				},
+			},
+			"400": map[string]any{"description": "Bad Request - Missing patterns or invalid input"},
+			"401": map[string]any{"description": "Unauthorized - Missing or invalid API key"},
+			"403": map[string]any{"description": "Forbidden - Requires admin scope"},
+		},
+	})
 }
 
 func registerCommandPaths(spec *api.OpenAPISpec) {
diff --git a/cookbooks/scripts/common.sh b/cookbooks/scripts/common.sh
index 13ad05e..4b2e3ed 100755
--- a/cookbooks/scripts/common.sh
+++ b/cookbooks/scripts/common.sh
@@ -17,6 +17,47 @@ set -euo pipefail
 : "${RDEV_API_URL:?RDEV_API_URL must be set}"
 : "${RDEV_API_KEY:?RDEV_API_KEY must be set}"
 
+# Auto-cleanup configuration
+# Set AUTO_TEARDOWN=true to automatically clean up projects on exit
+AUTO_TEARDOWN="${AUTO_TEARDOWN:-false}"
+
+# Track created project for cleanup
+# Scripts should set this after successful project creation
+CLEANUP_PROJECT=""
+
+# Cleanup handler for auto-teardown
+# Called on script exit when AUTO_TEARDOWN=true
+cleanup_on_exit() {
+    local exit_code=$?
+    if [[ -n "$CLEANUP_PROJECT" && "$AUTO_TEARDOWN" == "true" ]]; then
+        echo ""
+        echo -e "${CYAN}Auto-teardown: Cleaning up $CLEANUP_PROJECT...${NC}"
+        api_call DELETE "/project/$CLEANUP_PROJECT" > /dev/null 2>&1 || true
+        echo -e "${GREEN}✓ Project $CLEANUP_PROJECT deleted${NC}"
+    fi
+    exit $exit_code
+}
+
+# Register cleanup handler
+# Scripts should call this after sourcing common.sh if they want auto-cleanup
+register_cleanup_trap() {
+    trap cleanup_on_exit EXIT INT TERM
+}
+
+# Parse --auto-teardown from args and return remaining args
+# Usage: args=$(parse_auto_teardown_flag "$@")
+parse_auto_teardown_flag() {
+    local args=()
+    for arg in "$@"; do
+        if [[ "$arg" == "--auto-teardown" ]]; then
+            AUTO_TEARDOWN="true"
+        else
+            args+=("$arg")
+        fi
+    done
+    echo "${args[@]}"
+}
+
 # Colors for output
 RED='\033[0;31m'
 GREEN='\033[0;32m'
diff --git a/cookbooks/scripts/composable-test.sh b/cookbooks/scripts/composable-test.sh
index 55e7305..ce944e5 100755
--- a/cookbooks/scripts/composable-test.sh
+++ b/cookbooks/scripts/composable-test.sh
@@ -15,8 +15,21 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 source "$SCRIPT_DIR/common.sh"
 
-COMMAND="${1:-}"
-PROJECT_NAME="${2:-}"
+# Parse --auto-teardown flag from args
+ARGS=("$@")
+for i in "${!ARGS[@]}"; do
+    if [[ "${ARGS[$i]}" == "--auto-teardown" ]]; then
+        AUTO_TEARDOWN="true"
+        unset 'ARGS[$i]'
+    fi
+done
+ARGS=("${ARGS[@]}")  # Re-index array
+
+COMMAND="${ARGS[0]:-}"
+PROJECT_NAME="${ARGS[1]:-}"
+
+# Register cleanup trap for auto-teardown
+register_cleanup_trap
 
 if [[ -z "$COMMAND" || -z "$PROJECT_NAME" ]]; then
     echo "Usage: $0 <command> <project-name>"
@@ -85,6 +98,9 @@ run_flow() {
         exit 1
     fi
 
+    # Track project for auto-cleanup
+    CLEANUP_PROJECT="$PROJECT_NAME"
+
     print_success "Project created with domain: $domain"
 
     # Step 2: Add backend service
diff --git a/cookbooks/scripts/feature-test.sh b/cookbooks/scripts/feature-test.sh
index d87ffb6..ead3588 100755
--- a/cookbooks/scripts/feature-test.sh
+++ b/cookbooks/scripts/feature-test.sh
@@ -17,8 +17,21 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 source "$SCRIPT_DIR/common.sh"
 
-COMMAND="${1:-}"
-PROJECT_NAME="${2:-}"
+# Parse --auto-teardown flag from args
+ARGS=("$@")
+for i in "${!ARGS[@]}"; do
+    if [[ "${ARGS[$i]}" == "--auto-teardown" ]]; then
+        AUTO_TEARDOWN="true"
+        unset 'ARGS[$i]'
+    fi
+done
+ARGS=("${ARGS[@]}")  # Re-index array
+
+COMMAND="${ARGS[0]:-}"
+PROJECT_NAME="${ARGS[1]:-}"
+
+# Register cleanup trap for auto-teardown
+register_cleanup_trap
 
 if [[ -z "$COMMAND" || -z "$PROJECT_NAME" ]]; then
     echo "Usage: $0 <command> <project-name>"
@@ -337,6 +350,9 @@ run_flow() {
         exit 1
     fi
 
+    # Track project for auto-cleanup
+    CLEANUP_PROJECT="$PROJECT_NAME"
+
     print_success "Project created with domain: $domain"
 
     # Step 2: Add backend service
diff --git a/cookbooks/scripts/landing-test.sh b/cookbooks/scripts/landing-test.sh
index 15c8f20..3f83586 100755
--- a/cookbooks/scripts/landing-test.sh
+++ b/cookbooks/scripts/landing-test.sh
@@ -19,8 +19,21 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 source "$SCRIPT_DIR/common.sh"
 
-COMMAND="${1:-}"
-PROJECT_NAME="${2:-landing-test-$(date +%s)}"
+# Parse --auto-teardown flag from args
+ARGS=("$@")
+for i in "${!ARGS[@]}"; do
+    if [[ "${ARGS[$i]}" == "--auto-teardown" ]]; then
+        AUTO_TEARDOWN="true"
+        unset 'ARGS[$i]'
+    fi
+done
+ARGS=("${ARGS[@]}")  # Re-index array
+
+COMMAND="${ARGS[0]:-}"
+PROJECT_NAME="${ARGS[1]:-landing-test-$(date +%s)}"
+
+# Register cleanup trap for auto-teardown
+register_cleanup_trap
 
 if [[ -z "$COMMAND" ]]; then
     echo "Landing Page E2E Test Script"
@@ -62,6 +75,9 @@ run_flow() {
         exit 1
     fi
 
+    # Track project for auto-cleanup
+    CLEANUP_PROJECT="$PROJECT_NAME"
+
     print_success "Project created: $PROJECT_NAME"
     echo "  Domain: $domain"
     echo "  Git: https://git.threesix.ai/$(get_git_owner)/$PROJECT_NAME"
diff --git a/cookbooks/scripts/template-validation.sh b/cookbooks/scripts/template-validation.sh
index 26b181c..e9543d0 100755
--- a/cookbooks/scripts/template-validation.sh
+++ b/cookbooks/scripts/template-validation.sh
@@ -15,9 +15,22 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 source "$SCRIPT_DIR/common.sh"
 
-COMMAND="${1:-run}"
+# Parse --auto-teardown flag from args
+ARGS=("$@")
+for i in "${!ARGS[@]}"; do
+    if [[ "${ARGS[$i]}" == "--auto-teardown" ]]; then
+        AUTO_TEARDOWN="true"
+        unset 'ARGS[$i]'
+    fi
+done
+ARGS=("${ARGS[@]}")  # Re-index array
+
+COMMAND="${ARGS[0]:-run}"
 PROJECT_NAME="template-validation-$(date +%s)"
 
+# Register cleanup trap for auto-teardown
+register_cleanup_trap
+
 # Component types to test
 COMPONENT_TYPES=(
     "service"
@@ -255,6 +268,9 @@ run_full_validation() {
         exit 1
     fi
 
+    # Track project for auto-cleanup
+    CLEANUP_PROJECT="$PROJECT_NAME"
+
     print_success "Project created with domain: $domain"
 
     # Step 2: Add all component types
diff --git a/cookbooks/scripts/tree-runner.sh b/cookbooks/scripts/tree-runner.sh
index 883df1e..b3dddd7 100755
--- a/cookbooks/scripts/tree-runner.sh
+++ b/cookbooks/scripts/tree-runner.sh
@@ -28,6 +28,17 @@ source "$SCRIPT_DIR/common.sh"
 source "$SCRIPT_DIR/lib/checkpoint.sh"
 source "$SCRIPT_DIR/lib/tree-parser.sh"
 
+# Parse --auto-teardown flag from args
+ARGS=("$@")
+for i in "${!ARGS[@]}"; do
+    if [[ "${ARGS[$i]}" == "--auto-teardown" ]]; then
+        AUTO_TEARDOWN="true"
+        unset 'ARGS[$i]'
+    fi
+done
+ARGS=("${ARGS[@]}")  # Re-index array
+set -- "${ARGS[@]}"  # Reset positional params
+
 # Parse command
 COMMAND="${1:-}"
 
@@ -302,6 +313,21 @@ build_outputs_from_checkpoint() {
 # Commands
 # ============================================================================
 
+# Auto-teardown handler for tree runner
+# Called on exit when AUTO_TEARDOWN=true
+tree_auto_teardown() {
+    local exit_code=$?
+    if [[ -n "$TREE_AUTO_TEARDOWN_NAME" && "$AUTO_TEARDOWN" == "true" ]]; then
+        echo ""
+        echo -e "${CYAN}Auto-teardown: Running teardown for $TREE_AUTO_TEARDOWN_NAME...${NC}"
+        cmd_teardown "$TREE_AUTO_TEARDOWN_NAME" || true
+    fi
+    exit $exit_code
+}
+
+# Track tree name for auto-teardown (set during cmd_run)
+TREE_AUTO_TEARDOWN_NAME=""
+
 # Run a tree from the beginning
 cmd_run() {
     local tree_name="${1:-}"
@@ -312,6 +338,10 @@ cmd_run() {
         exit 1
     fi
 
+    # Register auto-teardown trap
+    TREE_AUTO_TEARDOWN_NAME="$tree_name"
+    trap tree_auto_teardown EXIT INT TERM
+
     # Validate tree exists
     if ! tree_parse "$tree_name" > /dev/null 2>&1; then
         print_error "Tree '$tree_name' not found"
diff --git a/internal/handlers/project_management.go b/internal/handlers/project_management.go
index fa615ab..02f796f 100644
--- a/internal/handlers/project_management.go
+++ b/internal/handlers/project_management.go
@@ -56,6 +56,13 @@ func (h *ProjectManagementHandler) Mount(r api.Router) {
 			Get("/{name}", h.Status)
 	})
 
+	// Bulk operations on projects (admin only)
+	r.Route("/projects", func(r chi.Router) {
+		// Cleanup test projects - admin only for safety
+		r.With(auth.RequireScope(auth.ScopeAdmin)).
+			Delete("/cleanup", h.CleanupTestProjects)
+	})
+
 	// Template endpoints (read-only)
 	r.With(auth.RequireScope(auth.ScopeProjectsRead, auth.ScopeAdmin)).
 		Get("/templates", h.ListTemplates)
@@ -341,6 +348,59 @@ func (h *ProjectManagementHandler) GetTemplate(w http.ResponseWriter, r *http.Re
 	})
 }
 
+// CleanupTestProjectsRequest is the request body for DELETE /projects/cleanup.
+type CleanupTestProjectsRequest struct {
+	Patterns     []string `json:"patterns"`         // Name patterns to match (e.g., "tree-test-*", "landing-test-*")
+	OlderThanHrs int      `json:"older_than_hours"` // Only delete projects older than this many hours
+	DryRun       bool     `json:"dry_run"`          // If true, don't actually delete, just return what would be deleted
+}
+
+// CleanupTestProjects deletes test projects matching patterns that are older than a specified age.
+// DELETE /projects/cleanup
+// Admin scope required for safety.
+func (h *ProjectManagementHandler) CleanupTestProjects(w http.ResponseWriter, r *http.Request) {
+	ctx, cancel := context.WithTimeout(r.Context(), TimeoutLongRunning)
+	defer cancel()
+
+	if h.infraService == nil {
+		api.WriteInternalError(w, r, "project infrastructure service not configured")
+		return
+	}
+
+	var req CleanupTestProjectsRequest
+	if err := api.DecodeJSON(r, &req); err != nil {
+		api.WriteBadRequest(w, r, "invalid request body")
+		return
+	}
+
+	if len(req.Patterns) == 0 {
+		api.WriteBadRequest(w, r, "at least one pattern is required")
+		return
+	}
+
+	if req.OlderThanHrs < 0 {
+		api.WriteBadRequest(w, r, "older_than_hours must be non-negative")
+		return
+	}
+
+	result, err := h.infraService.CleanupTestProjects(ctx, service.CleanupTestProjectsRequest{
+		Patterns:     req.Patterns,
+		OlderThanHrs: req.OlderThanHrs,
+		DryRun:       req.DryRun,
+	})
+	if err != nil {
+		h.logger.Error("failed to cleanup test projects", "error", err)
+		api.WriteInternalError(w, r, "failed to cleanup test projects")
+		return
+	}
+
+	api.WriteSuccess(w, r, map[string]any{
+		"deleted": result.Deleted,
+		"count":   result.Count,
+		"dry_run": result.DryRun,
+	})
+}
+
 // ListComponentTemplates returns available component templates.
 // GET /templates/components
 func (h *ProjectManagementHandler) ListComponentTemplates(w http.ResponseWriter, r *http.Request) {
diff --git a/internal/service/project_infra_crud.go b/internal/service/project_infra_crud.go
index e53397d..cfa0571 100644
--- a/internal/service/project_infra_crud.go
+++ b/internal/service/project_infra_crud.go
@@ -701,3 +701,120 @@ func (s *ProjectInfraService) ListComponentTemplates(ctx context.Context, compon
 	}
 	return s.templateProvider.ListComponentTemplates(ctx, componentType)
 }
+
+// CleanupTestProjectsRequest contains parameters for cleaning up test projects.
+type CleanupTestProjectsRequest struct {
+	Patterns     []string // Name patterns to match (e.g., "tree-test-*", "landing-test-*")
+	OlderThanHrs int      // Only delete projects older than this many hours
+	DryRun       bool     // If true, don't actually delete, just return what would be deleted
+}
+
+// CleanupTestProjectsResult contains the result of a cleanup operation.
+type CleanupTestProjectsResult struct {
+	Deleted []string // Names of deleted projects
+	Count   int      // Number of projects deleted
+	DryRun  bool     // Whether this was a dry run
+}
+
+// CleanupTestProjects deletes test projects matching the given patterns that are older than the specified age.
+// This is useful for cleaning up orphaned test projects created by cookbook scripts.
+func (s *ProjectInfraService) CleanupTestProjects(ctx context.Context, req CleanupTestProjectsRequest) (*CleanupTestProjectsResult, error) {
+	if len(req.Patterns) == 0 {
+		return nil, fmt.Errorf("at least one pattern is required")
+	}
+
+	// Calculate cutoff time
+	cutoff := time.Now().Add(-time.Duration(req.OlderThanHrs) * time.Hour)
+
+	s.logger.Info("cleaning up test projects",
+		"patterns", req.Patterns,
+		"older_than_hours", req.OlderThanHrs,
+		"cutoff", cutoff,
+		"dry_run", req.DryRun,
+	)
+
+	// Find matching projects
+	projects, err := s.listProjectsByPatternOlderThan(ctx, req.Patterns, cutoff)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list matching projects: %w", err)
+	}
+
+	result := &CleanupTestProjectsResult{
+		Deleted: make([]string, 0, len(projects)),
+		DryRun:  req.DryRun,
+	}
+
+	for _, projectID := range projects {
+		if req.DryRun {
+			result.Deleted = append(result.Deleted, projectID)
+			continue
+		}
+
+		// Actually delete the project
+		if err := s.DeleteProject(ctx, projectID); err != nil {
+			s.logger.Warn("failed to delete project during cleanup",
+				"project", projectID,
+				"error", err,
+			)
+			// Continue with other projects even if one fails
+			continue
+		}
+
+		result.Deleted = append(result.Deleted, projectID)
+		s.logger.Info("deleted test project", "project", projectID)
+	}
+
+	result.Count = len(result.Deleted)
+
+	s.logger.Info("test project cleanup complete",
+		"deleted_count", result.Count,
+		"dry_run", req.DryRun,
+	)
+
+	return result, nil
+}
+
+// listProjectsByPatternOlderThan returns project IDs matching any of the given patterns
+// that were created before the cutoff time.
+// Patterns support SQL LIKE wildcards: % (any characters), _ (single character).
+// For convenience, * is converted to % for shell-style glob patterns.
+func (s *ProjectInfraService) listProjectsByPatternOlderThan(ctx context.Context, patterns []string, cutoff time.Time) ([]string, error) {
+	// Convert shell-style globs to SQL LIKE patterns
+	likePatterns := make([]string, len(patterns))
+	for i, p := range patterns {
+		// Replace * with % for SQL LIKE
+		likePatterns[i] = strings.ReplaceAll(p, "*", "%")
+	}
+
+	// Build query with OR conditions for each pattern
+	// Using parameterized query to prevent SQL injection
+	var queryBuilder strings.Builder
+	queryBuilder.WriteString(`SELECT id FROM projects WHERE created_at < $1 AND (`)
+	args := []any{cutoff}
+
+	for i, pattern := range likePatterns {
+		if i > 0 {
+			queryBuilder.WriteString(" OR ")
+		}
+		fmt.Fprintf(&queryBuilder, "name LIKE $%d", i+2)
+		args = append(args, pattern)
+	}
+	queryBuilder.WriteString(`) ORDER BY created_at ASC`)
+
+	rows, err := s.db.QueryContext(ctx, queryBuilder.String(), args...)
+	if err != nil {
+		return nil, fmt.Errorf("query failed: %w", err)
+	}
+	defer func() { _ = rows.Close() }()
+
+	var projectIDs []string
+	for rows.Next() {
+		var id string
+		if err := rows.Scan(&id); err != nil {
+			continue
+		}
+		projectIDs = append(projectIDs, id)
+	}
+
+	return projectIDs, rows.Err()
+}