diff --git a/Makefile b/Makefile
index 04df77d164d..b3e6675b343 100644
--- a/Makefile
+++ b/Makefile
@@ -1023,6 +1023,16 @@ lint-cjs: fmt-check-cjs validate-cjs-syntax check-node-version
 lint-json: fmt-check-json
 	@echo "✓ JSON formatting validated"
 
+# Full-repository error-message audit (non-blocking report).
+# Reports pre-existing error-message violations across the repo so the debt can
+# be tracked as a metric over time. Always exits 0.
+.PHONY: lint-error-messages-report
+lint-error-messages-report:
+	@echo "Building custom linters..."
+	@env -u GOOS -u GOARCH go build -o /tmp/gh-aw-linters ./cmd/linters
+	@echo "Auditing error messages across $(LINTER_PACKAGES) (non-blocking)..."
+	@/tmp/gh-aw-linters -errormessage -errormessage.full-repo $(LINTER_PACKAGES) || true
+
 # Lint error messages for quality compliance
 .PHONY: lint-errors
 lint-errors:
@@ -1399,6 +1409,7 @@ help:
 	@echo "  validate-cjs-syntax - Syntax-check all non-test .cjs files (catches module-load SyntaxErrors)"
 	@echo "  lint-json        - Lint JSON files in pkg directory (excluding actions/setup/js)"
 	@echo "  lint-errors      - Lint error messages for quality compliance"
+	@echo "  lint-error-messages-report - Non-blocking full-repo error message audit"
 	@echo "  validate-otel-contract - Validate the gh-aw OpenTelemetry compatibility contract"
 	@echo "  lint-action-sh   - Lint action shell scripts for python/python3 invocations"
 	@echo "  shellcheck-setup-sh - Run shellcheck on actions/setup/sh scripts"
diff --git a/pkg/linters/README.md b/pkg/linters/README.md
index 60fe1ff1a20..30f7ea61b4d 100644
--- a/pkg/linters/README.md
+++ b/pkg/linters/README.md
@@ -15,7 +15,7 @@ This package currently provides custom Go analyzers in the following subpackages
 - `deferinloop` — reports `defer` statements placed directly inside `for`/`range` loop bodies, which execute when the enclosing function returns rather than each iteration and can cause resource leaks.
 - `errorfwrapv` — reports `fmt.Errorf` calls that pass error arguments without `%w` wrapping.
 - `excessivefuncparams` — reports function declarations that exceed a configurable parameter-count threshold.
-- `errormessage` — reports non-actionable error-message patterns in changed files.
+- `errormessage` — reports non-actionable error-message patterns in changed files; pass `-errormessage.full-repo` (or `-errormessage.changed-files=all`) to audit the whole repository.
 - `errortypeassertion` — reports type assertions from `error` to concrete types and recommends `errors.As`.
 - `errstringmatch` — reports `strings.Contains(err.Error(), "...")` patterns and recommends `errors.Is` / `errors.As`.
 - `fileclosenotdeferred` — reports non-deferred file `Close()` calls that can leak resources.
@@ -85,7 +85,7 @@ This package currently provides custom Go analyzers in the following subpackages
 | `deferinloop` | Custom `go/analysis` analyzer that flags `defer` statements inside `for`/`range` loop bodies that execute when the enclosing function returns rather than each iteration |
 | `errorfwrapv` | Custom `go/analysis` analyzer that flags `fmt.Errorf` calls that pass error arguments without `%w` wrapping |
 | `excessivefuncparams` | Custom `go/analysis` analyzer that flags function declarations with too many positional parameters |
-| `errormessage` | Custom `go/analysis` analyzer that flags non-actionable error message patterns in changed files |
+| `errormessage` | Custom `go/analysis` analyzer that flags non-actionable error message patterns in changed files (or all files with `-errormessage.full-repo`) |
 | `errortypeassertion` | Custom `go/analysis` analyzer that flags type assertions from `error` to concrete types and recommends `errors.As` |
 | `errstringmatch` | Custom `go/analysis` analyzer that flags brittle `strings.Contains(err.Error(), "...")` checks |
 | `execcommandwithoutcontext` | Custom `go/analysis` analyzer that flags `exec.Command(...)` calls that should use `exec.CommandContext(...)` in context-receiving functions |
diff --git a/pkg/linters/errormessage/errormessage.go b/pkg/linters/errormessage/errormessage.go
index 757012b3af5..bc54c18b7a4 100644
--- a/pkg/linters/errormessage/errormessage.go
+++ b/pkg/linters/errormessage/errormessage.go
@@ -24,16 +24,29 @@ var (
 	// changedFilesCSV allows CI to scope linting to changed files only,
 	// preventing legacy violations from blocking incremental adoption.
 	changedFilesCSV string
+	// fullRepo enables auditing every analyzed file instead of only the
+	// changed ones, so pre-existing violations can be tracked as a metric.
+	fullRepo bool
 )
 
+// fullRepoSentinel is the -changed-files value that enables full-repository
+// auditing, equivalent to passing -full-repo.
+const fullRepoSentinel = "all"
+
 // Analyzer is the errormessage analysis pass.
-var Analyzer = analyzerutil.New("errormessage", "reports non-actionable error message patterns in changed files", run)
+var Analyzer = analyzerutil.New("errormessage", "reports non-actionable error message patterns in changed files (or all files with -full-repo)", run)
 
 func init() {
-	Analyzer.Flags.StringVar(&changedFilesCSV, "changed-files", "", "comma-separated list of changed file paths to lint (when empty, analyzer is a no-op)")
+	Analyzer.Flags.StringVar(&changedFilesCSV, "changed-files", "", "comma-separated list of changed file paths to lint (when empty, analyzer is a no-op; use \"all\" to audit every file)")
+	Analyzer.Flags.BoolVar(&fullRepo, "full-repo", false, "audit every analyzed file instead of only the changed ones")
 }
 
 func run(pass *analysis.Pass) (any, error) {
+	if fullRepo || isFullRepoSentinel(changedFilesCSV) {
+		pkgLog.Printf("analyzing package %s in full-repo mode", pass.Pkg.Path())
+		return runOnFiles(pass, nil)
+	}
+
 	changed := parseChangedFiles(changedFilesCSV)
 	if len(changed) == 0 {
 		pkgLog.Printf("no changed files provided for %s, skipping", pass.Pkg.Path())
@@ -41,6 +54,12 @@ func run(pass *analysis.Pass) (any, error) {
 	}
 	pkgLog.Printf("analyzing package %s (%d changed files)", pass.Pkg.Path(), len(changed))
 
+	return runOnFiles(pass, changed)
+}
+
+// runOnFiles analyzes the package. When changed is nil every file is checked
+// (full-repo audit mode); otherwise only files present in changed are checked.
+func runOnFiles(pass *analysis.Pass, changed map[string]struct{}) (any, error) {
 	noLintIndex, err := nolint.Index(pass)
 	if err != nil {
 		return nil, err
@@ -92,7 +111,18 @@ func parseChangedFiles(csv string) map[string]struct{} {
 	return changed
 }
 
+// isFullRepoSentinel reports whether the -changed-files value requests a
+// full-repository audit.
+func isFullRepoSentinel(csv string) bool {
+	return strings.EqualFold(strings.TrimSpace(csv), fullRepoSentinel)
+}
+
+// shouldCheckFile reports whether filename is in scope. A nil changed set means
+// full-repo audit mode, where every file is in scope.
 func shouldCheckFile(filename string, changed map[string]struct{}) bool {
+	if changed == nil {
+		return true
+	}
 	path := filepath.ToSlash(filename)
 	for changedPath := range changed {
 		if path == changedPath || strings.HasSuffix(path, "/"+changedPath) {
diff --git a/pkg/linters/errormessage/errormessage_test.go b/pkg/linters/errormessage/errormessage_test.go
index 7d928b43b0c..7bde75c9bee 100644
--- a/pkg/linters/errormessage/errormessage_test.go
+++ b/pkg/linters/errormessage/errormessage_test.go
@@ -22,3 +22,25 @@ func TestErrorMessage(t *testing.T) {
 
 	analysistest.Run(t, analysistest.TestData(), errormessage.Analyzer, "errormessage")
 }
+
+func TestErrorMessageFullRepoFlag(t *testing.T) {
+	if err := errormessage.Analyzer.Flags.Set("full-repo", "true"); err != nil {
+		t.Fatalf("failed to set full-repo flag: %v", err)
+	}
+	t.Cleanup(func() {
+		_ = errormessage.Analyzer.Flags.Set("full-repo", "false")
+	})
+
+	analysistest.Run(t, analysistest.TestData(), errormessage.Analyzer, "errormessage")
+}
+
+func TestErrorMessageFullRepoSentinel(t *testing.T) {
+	if err := errormessage.Analyzer.Flags.Set("changed-files", "all"); err != nil {
+		t.Fatalf("failed to set changed-files flag: %v", err)
+	}
+	t.Cleanup(func() {
+		_ = errormessage.Analyzer.Flags.Set("changed-files", "")
+	})
+
+	analysistest.Run(t, analysistest.TestData(), errormessage.Analyzer, "errormessage")
+}