diff --git a/packages/devtools/src/__tests__/runner.test.ts b/packages/devtools/src/__tests__/runner.test.ts
index 3efb401..684e333 100644
--- a/packages/devtools/src/__tests__/runner.test.ts
+++ b/packages/devtools/src/__tests__/runner.test.ts
@@ -1,8 +1,13 @@
+import { execSync } from "node:child_process";
 import { mkdirSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { describe, it, expect } from "vitest";
-import { parseStateFile } from "../desloppify/runner.js";
+import { describe, it, expect, vi, afterEach } from "vitest";
+import { parseStateFile, runDesloppifyScan } from "../desloppify/runner.js";
+
+vi.mock("node:child_process", () => ({
+  execSync: vi.fn(),
+}));
 
 describe("parseStateFile", () => {
   it("parses a valid state file", () => {
@@ -43,3 +48,53 @@ describe("parseStateFile", () => {
     expect(() => parseStateFile(statePath)).toThrow(statePath);
   });
 });
+
+describe("runDesloppifyScan scan-loop error handling", () => {
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("sets error field when a package scan throws", () => {
+    vi.mocked(execSync).mockImplementation(() => {
+      throw new Error("desloppify command not found");
+    });
+
+    const repoDir = join(tmpdir(), `scan-error-test-${Date.now()}`);
+    const pkgDir = join(repoDir, "packages", "alpha");
+    mkdirSync(pkgDir, { recursive: true });
+    writeFileSync(
+      join(pkgDir, "package.json"),
+      JSON.stringify({ name: "@test/alpha" }),
+    );
+
+    const result = runDesloppifyScan({
+      repo: repoDir,
+      packages: ["packages/alpha"],
+    });
+
+    expect(result.packages).toHaveLength(1);
+    expect(result.packages[0]!.error).toContain("desloppify command not found");
+    expect(result.packages[0]!.issues).toEqual([]);
+  });
+
+  it("does not set error field on a successful scan with zero issues", () => {
+    vi.mocked(execSync).mockImplementation(() => Buffer.from(""));
+
+    const repoDir = join(tmpdir(), `scan-success-test-${Date.now()}`);
+    const pkgDir = join(repoDir, "packages", "beta");
+    mkdirSync(pkgDir, { recursive: true });
+    writeFileSync(
+      join(pkgDir, "package.json"),
+      JSON.stringify({ name: "@test/beta" }),
+    );
+
+    const result = runDesloppifyScan({
+      repo: repoDir,
+      packages: ["packages/beta"],
+    });
+
+    expect(result.packages).toHaveLength(1);
+    expect(result.packages[0]!.error).toBeUndefined();
+    expect(result.packages[0]!.issues).toEqual([]);
+  });
+});
diff --git a/packages/devtools/src/commands/desloppify.ts b/packages/devtools/src/commands/desloppify.ts
index b35933b..05f846d 100644
--- a/packages/devtools/src/commands/desloppify.ts
+++ b/packages/devtools/src/commands/desloppify.ts
@@ -14,6 +14,9 @@ function formatSummary(result: ScanResult): string {
 
   for (const pkg of result.packages) {
     lines.push(`Package: ${pkg.name} (${pkg.path})`);
+    if (pkg.error) {
+      lines.push(`  Error: ${pkg.error}`);
+    }
     lines.push(
       `  Score: overall=${pkg.score.overall} objective=${pkg.score.objective} strict=${pkg.score.strict}`,
     );
diff --git a/packages/devtools/src/desloppify/runner.ts b/packages/devtools/src/desloppify/runner.ts
index e508b48..95547e9 100644
--- a/packages/devtools/src/desloppify/runner.ts
+++ b/packages/devtools/src/desloppify/runner.ts
@@ -268,6 +268,7 @@ export function runDesloppifyScan(options: RunnerOptions): ScanResult {
           path: pkgRelPath,
           score: { overall: 0, objective: 0, strict: 0 },
           issues: [],
+          error: String(err),
         });
       }
     }
diff --git a/packages/devtools/src/desloppify/types.ts b/packages/devtools/src/desloppify/types.ts
index 94b3642..aed52d0 100644
--- a/packages/devtools/src/desloppify/types.ts
+++ b/packages/devtools/src/desloppify/types.ts
@@ -21,6 +21,7 @@ export interface PackageResult {
     strict: number;
   };
   issues: DesloppifyIssue[];
+  error?: string;
 }
 
 export interface ScanResult {