diff --git a/dist/cli.js b/dist/cli.js
index 5adce80..504fcce 100644
--- a/dist/cli.js
+++ b/dist/cli.js
@@ -293,6 +293,23 @@ async function readVersion() {
     }
 }
 if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
-    main(process.argv.slice(2)).then((code) => process.exit(code));
+    // Set exitCode and let the event loop drain, rather than process.exit(code).
+    //
+    // process.exit() tears the process down immediately. On Windows, if a libuv
+    // async handle is mid-close when that happens — which it is on any path that
+    // did fs or network I/O — Node aborts with:
+    //
+    //   Assertion failed: !(handle->flags & UV_HANDLE_CLOSING), file src\win\async.c, line 76
+    //
+    // The verdict has already been printed by then, so the output looks correct
+    // while the shell sees an abnormal exit (127) instead of the documented code.
+    // That silently breaks every CI consumer, which is the one audience that
+    // reads the exit code rather than the text.
+    //
+    // Assigning exitCode lets Node close its handles and exit normally with the
+    // code we asked for. Nothing here keeps the loop alive deliberately.
+    main(process.argv.slice(2)).then((code) => {
+        process.exitCode = code;
+    });
 }
 //# sourceMappingURL=cli.js.map
\ No newline at end of file
diff --git a/dist/cli.js.map b/dist/cli.js.map
index a1f2714..c748f5d 100644
--- a/dist/cli.js.map
+++ b/dist/cli.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/dist/exit-codes.test.d.ts b/dist/exit-codes.test.d.ts
new file mode 100644
index 0000000..7927d75
--- /dev/null
+++ b/dist/exit-codes.test.d.ts
@@ -0,0 +1,24 @@
+/**
+ * Exit-code contract for the receipt path.
+ *
+ * README documents 0 VALID / 1 INVALID / 2 UNKNOWN_KEY / 3 MALFORMED /
+ * 4 NETWORK / 64 USAGE, and CI consumers are the one audience that reads the
+ * exit code rather than the text.
+ *
+ * The entry point used to call process.exit(code), which tears the process down
+ * immediately. On Windows, if a libuv async handle was mid-close — which it is
+ * on any path that did fs or network I/O — Node aborted with:
+ *
+ *   Assertion failed: !(handle->flags & UV_HANDLE_CLOSING), file src\win\async.c, line 76
+ *
+ * The verdict had already been printed, so output looked correct while the
+ * shell saw 127. Every documented code was wrong on those paths and nothing
+ * caught it, because the existing CLI tests exercise the certificate path with
+ * --offline and never hit the race.
+ *
+ * These tests exercise the RECEIPT path specifically, including one that reads
+ * a local file and still fetches the public key — the exact combination that
+ * aborted.
+ */
+export {};
+//# sourceMappingURL=exit-codes.test.d.ts.map
\ No newline at end of file
diff --git a/dist/exit-codes.test.d.ts.map b/dist/exit-codes.test.d.ts.map
new file mode 100644
index 0000000..89cc473
--- /dev/null
+++ b/dist/exit-codes.test.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"exit-codes.test.d.ts","sourceRoot":"","sources":["../src/exit-codes.test.ts"],"names":[],"mappings":"AAAA;;;;;;;;;;;;;;;;;;;;;GAqBG"}
\ No newline at end of file
diff --git a/dist/exit-codes.test.js b/dist/exit-codes.test.js
new file mode 100644
index 0000000..b821f15
--- /dev/null
+++ b/dist/exit-codes.test.js
@@ -0,0 +1,82 @@
+/**
+ * Exit-code contract for the receipt path.
+ *
+ * README documents 0 VALID / 1 INVALID / 2 UNKNOWN_KEY / 3 MALFORMED /
+ * 4 NETWORK / 64 USAGE, and CI consumers are the one audience that reads the
+ * exit code rather than the text.
+ *
+ * The entry point used to call process.exit(code), which tears the process down
+ * immediately. On Windows, if a libuv async handle was mid-close — which it is
+ * on any path that did fs or network I/O — Node aborted with:
+ *
+ *   Assertion failed: !(handle->flags & UV_HANDLE_CLOSING), file src\win\async.c, line 76
+ *
+ * The verdict had already been printed, so output looked correct while the
+ * shell saw 127. Every documented code was wrong on those paths and nothing
+ * caught it, because the existing CLI tests exercise the certificate path with
+ * --offline and never hit the race.
+ *
+ * These tests exercise the RECEIPT path specifically, including one that reads
+ * a local file and still fetches the public key — the exact combination that
+ * aborted.
+ */
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { spawn } from "node:child_process";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+const here = dirname(fileURLToPath(import.meta.url));
+const cliPath = join(here, "cli.js");
+const fixturesDir = join(here, "..", "fixtures");
+function run(args) {
+    return new Promise((resolve) => {
+        const env = { ...process.env, NO_COLOR: "1" };
+        const child = spawn(process.execPath, [cliPath, ...args], { env });
+        let stdout = "";
+        let stderr = "";
+        child.stdout.on("data", (d) => (stdout += d.toString()));
+        child.stderr.on("data", (d) => (stderr += d.toString()));
+        child.on("close", (code) => resolve({ stdout, stderr, code: code ?? -1 }));
+    });
+}
+/** The process must exit cleanly, never abort. */
+function assertNoAbort(r, label) {
+    assert.ok(!/(Assertion failed|UV_HANDLE_CLOSING)/.test(r.stderr + r.stdout), `${label}: process aborted instead of exiting — ${r.stderr.trim()}`);
+    assert.notEqual(r.code, 127, `${label}: exit 127 means the process died abnormally`);
+}
+test("receipt VALID from a local file exits 0, not 127", async () => {
+    // Reads a file AND fetches the PEM — the combination that aborted.
+    const r = await run([join(fixturesDir, "valid-receipt.json"), "--type", "receipt"]);
+    assertNoAbort(r, "valid");
+    assert.match(r.stdout, /VALID/);
+    assert.equal(r.code, 0, `stderr: ${r.stderr}`);
+});
+test("receipt INVALID exits 1", async () => {
+    const r = await run([join(fixturesDir, "tampered-receipt.json"), "--type", "receipt"]);
+    assertNoAbort(r, "tampered");
+    assert.match(r.stdout, /INVALID/);
+    assert.equal(r.code, 1, `stderr: ${r.stderr}`);
+});
+test("receipt MALFORMED exits 3", async () => {
+    const r = await run([join(fixturesDir, "malformed-receipt.json"), "--type", "receipt"]);
+    assertNoAbort(r, "malformed");
+    assert.match(r.stdout, /MALFORMED/);
+    assert.equal(r.code, 3, `stderr: ${r.stderr}`);
+});
+test("--version exits 0 and prints a version", async () => {
+    const r = await run(["--version"]);
+    assertNoAbort(r, "version");
+    assert.equal(r.code, 0);
+    assert.match(r.stdout, /@certifieddata\/verify/);
+});
+test("--help exits 0", async () => {
+    const r = await run(["--help"]);
+    assertNoAbort(r, "help");
+    assert.equal(r.code, 0);
+});
+test("no arguments is a usage error, exit 64", async () => {
+    const r = await run([]);
+    assertNoAbort(r, "no args");
+    assert.equal(r.code, 64);
+});
+//# sourceMappingURL=exit-codes.test.js.map
\ No newline at end of file
diff --git a/dist/exit-codes.test.js.map b/dist/exit-codes.test.js.map
new file mode 100644
index 0000000..97b572f
--- /dev/null
+++ b/dist/exit-codes.test.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/package.json b/package.json
index 842b01c..7606ad6 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     "prepare": "npm run build",
     "typecheck": "tsc --noEmit",
     "lint": "eslint src/",
-    "test": "tsc -p tsconfig.json && node --test dist/canonicalize.test.js dist/verify.test.js dist/cli.test.js dist/receipt.test.js dist/receipt-vectors.test.js",
+    "test": "tsc -p tsconfig.json && node --test dist/canonicalize.test.js dist/verify.test.js dist/cli.test.js dist/receipt.test.js dist/receipt-vectors.test.js dist/exit-codes.test.js",
     "fixtures": "node fixtures/generate.mjs",
     "prepublishOnly": "npm run build && npm test"
   },
diff --git a/src/cli.ts b/src/cli.ts
index 15c71fb..9b786d6 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -289,5 +289,22 @@ async function readVersion(): Promise<string> {
 }
 
 if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
-  main(process.argv.slice(2)).then((code) => process.exit(code));
+  // Set exitCode and let the event loop drain, rather than process.exit(code).
+  //
+  // process.exit() tears the process down immediately. On Windows, if a libuv
+  // async handle is mid-close when that happens — which it is on any path that
+  // did fs or network I/O — Node aborts with:
+  //
+  //   Assertion failed: !(handle->flags & UV_HANDLE_CLOSING), file src\win\async.c, line 76
+  //
+  // The verdict has already been printed by then, so the output looks correct
+  // while the shell sees an abnormal exit (127) instead of the documented code.
+  // That silently breaks every CI consumer, which is the one audience that
+  // reads the exit code rather than the text.
+  //
+  // Assigning exitCode lets Node close its handles and exit normally with the
+  // code we asked for. Nothing here keeps the loop alive deliberately.
+  main(process.argv.slice(2)).then((code) => {
+    process.exitCode = code;
+  });
 }
diff --git a/src/exit-codes.test.ts b/src/exit-codes.test.ts
new file mode 100644
index 0000000..2b9bf53
--- /dev/null
+++ b/src/exit-codes.test.ts
@@ -0,0 +1,95 @@
+/**
+ * Exit-code contract for the receipt path.
+ *
+ * README documents 0 VALID / 1 INVALID / 2 UNKNOWN_KEY / 3 MALFORMED /
+ * 4 NETWORK / 64 USAGE, and CI consumers are the one audience that reads the
+ * exit code rather than the text.
+ *
+ * The entry point used to call process.exit(code), which tears the process down
+ * immediately. On Windows, if a libuv async handle was mid-close — which it is
+ * on any path that did fs or network I/O — Node aborted with:
+ *
+ *   Assertion failed: !(handle->flags & UV_HANDLE_CLOSING), file src\win\async.c, line 76
+ *
+ * The verdict had already been printed, so output looked correct while the
+ * shell saw 127. Every documented code was wrong on those paths and nothing
+ * caught it, because the existing CLI tests exercise the certificate path with
+ * --offline and never hit the race.
+ *
+ * These tests exercise the RECEIPT path specifically, including one that reads
+ * a local file and still fetches the public key — the exact combination that
+ * aborted.
+ */
+
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { spawn } from "node:child_process";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+
+const here = dirname(fileURLToPath(import.meta.url));
+const cliPath = join(here, "cli.js");
+const fixturesDir = join(here, "..", "fixtures");
+
+interface Run { stdout: string; stderr: string; code: number; }
+
+function run(args: string[]): Promise<Run> {
+  return new Promise((resolve) => {
+    const env = { ...process.env, NO_COLOR: "1" };
+    const child = spawn(process.execPath, [cliPath, ...args], { env });
+    let stdout = ""; let stderr = "";
+    child.stdout.on("data", (d) => (stdout += d.toString()));
+    child.stderr.on("data", (d) => (stderr += d.toString()));
+    child.on("close", (code) => resolve({ stdout, stderr, code: code ?? -1 }));
+  });
+}
+
+/** The process must exit cleanly, never abort. */
+function assertNoAbort(r: Run, label: string) {
+  assert.ok(
+    !/(Assertion failed|UV_HANDLE_CLOSING)/.test(r.stderr + r.stdout),
+    `${label}: process aborted instead of exiting — ${r.stderr.trim()}`,
+  );
+  assert.notEqual(r.code, 127, `${label}: exit 127 means the process died abnormally`);
+}
+
+test("receipt VALID from a local file exits 0, not 127", async () => {
+  // Reads a file AND fetches the PEM — the combination that aborted.
+  const r = await run([join(fixturesDir, "valid-receipt.json"), "--type", "receipt"]);
+  assertNoAbort(r, "valid");
+  assert.match(r.stdout, /VALID/);
+  assert.equal(r.code, 0, `stderr: ${r.stderr}`);
+});
+
+test("receipt INVALID exits 1", async () => {
+  const r = await run([join(fixturesDir, "tampered-receipt.json"), "--type", "receipt"]);
+  assertNoAbort(r, "tampered");
+  assert.match(r.stdout, /INVALID/);
+  assert.equal(r.code, 1, `stderr: ${r.stderr}`);
+});
+
+test("receipt MALFORMED exits 3", async () => {
+  const r = await run([join(fixturesDir, "malformed-receipt.json"), "--type", "receipt"]);
+  assertNoAbort(r, "malformed");
+  assert.match(r.stdout, /MALFORMED/);
+  assert.equal(r.code, 3, `stderr: ${r.stderr}`);
+});
+
+test("--version exits 0 and prints a version", async () => {
+  const r = await run(["--version"]);
+  assertNoAbort(r, "version");
+  assert.equal(r.code, 0);
+  assert.match(r.stdout, /@certifieddata\/verify/);
+});
+
+test("--help exits 0", async () => {
+  const r = await run(["--help"]);
+  assertNoAbort(r, "help");
+  assert.equal(r.code, 0);
+});
+
+test("no arguments is a usage error, exit 64", async () => {
+  const r = await run([]);
+  assertNoAbort(r, "no args");
+  assert.equal(r.code, 64);
+});