diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 49a25fa..17a3075 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3
       - uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3
         with:
-          node-version: 16
+          node-version: "18.7"
           cache: "npm"
       - run: npm ci
       - run: npm test
diff --git a/src/functions/edi/inbound/__fixtures__/events.ts b/src/functions/edi/inbound/__fixtures__/events.ts
index b88747f..fd807ca 100644
--- a/src/functions/edi/inbound/__fixtures__/events.ts
+++ b/src/functions/edi/inbound/__fixtures__/events.ts
@@ -45,7 +45,7 @@ export const sampleTransactionProcessedEvent = TransactionEventSchema.parse({
     },
     input: {
       type: "EDI/X12",
-      bucketName: "stedi-default-core-artifacts-217851219840",
+      bucketName: "account_id-sftp",
       key: "1f1b129a-9b86-04ea-3815-2d0f2b271c19/1746-1746-1.edi",
     },
     output: {
diff --git a/src/functions/edi/inbound/__tests__/handler.no-transaction-set-configured.ts b/src/functions/edi/inbound/__tests__/handler.no-transaction-set-configured.ts
index 79bfc10..0f509a9 100644
--- a/src/functions/edi/inbound/__tests__/handler.no-transaction-set-configured.ts
+++ b/src/functions/edi/inbound/__tests__/handler.no-transaction-set-configured.ts
@@ -71,7 +71,7 @@ test("throws runtime error when no configuration is found for transaction set",
     });
 
   const expectedErrorMessage =
-    "execution failed [id=7e5ceff7d64033820ab4fed8285328b4272369b7]: no transaction set configured";
+    "execution failed [id=725f84a020bdfdd61f597aaf4a1a8d5dfaa5b38d]: no transaction set configured";
   const errorWebhook = nock("https://example.com")
     .post("/error-webhook", (body: any) => {
       return body.error.message === expectedErrorMessage;
diff --git a/src/functions/edi/inbound/__tests__/handler.source-is-artifact-bucket.ts b/src/functions/edi/inbound/__tests__/handler.source-is-artifact-bucket.ts
new file mode 100644
index 0000000..964c6d8
--- /dev/null
+++ b/src/functions/edi/inbound/__tests__/handler.source-is-artifact-bucket.ts
@@ -0,0 +1,145 @@
+import test from "ava";
+import { handler } from "../handler.js";
+import nock from "nock";
+import { sampleTransactionProcessedEvent } from "../__fixtures__/events.js";
+import { sdkStreamMixin } from "@aws-sdk/util-stream-node";
+import {
+  mockBucketClient,
+  mockExecutionTracking,
+  mockGuideClient,
+  mockStashClient,
+  mockTranslateClient,
+} from "../../../../lib/testing/testHelpers.js";
+import {
+  DeleteObjectCommand,
+  GetObjectCommand,
+} from "@stedi/sdk-client-buckets";
+import { Readable } from "stream";
+import { GetValueCommand } from "@stedi/sdk-client-stash";
+import guideJSON855 from "../__fixtures__/855-guide.json" assert { type: "json" };
+
+const buckets = mockBucketClient();
+const translate = mockTranslateClient();
+const stash = mockStashClient();
+const guides = mockGuideClient();
+
+const partnershipId = "this-is-me_another-merchant";
+
+test.beforeEach(() => {
+  nock.disableNetConnect();
+  mockExecutionTracking(buckets);
+});
+
+test.afterEach.always(() => {
+  buckets.reset();
+  guides.reset();
+  stash.reset();
+  translate.reset();
+});
+
+test.serial("deletes input file", async (t) => {
+  // loading incoming EDI file from S3
+  buckets.on(GetObjectCommand, {}).resolves({
+    body: sdkStreamMixin(
+      Readable.from([new TextEncoder().encode(JSON.stringify(guideJSON855))])
+    ),
+  });
+
+  stash
+    .on(GetValueCommand, {
+      key: `destinations|${partnershipId}|855`,
+    }) // mock destinations lookup
+    .resolvesOnce({
+      value: {
+        description:
+          "Purchase Order Acknowledgments received from ANOTHERMERCH",
+        destinations: [
+          {
+            destination: {
+              type: "webhook",
+              url: "https://webhook.site/TESTING",
+              verb: "POST",
+            },
+          },
+        ],
+      },
+    });
+
+  // mock destination webhook delivery
+  const webhookRequest = nock("https://webhook.site")
+    .post("/TESTING", (body) => t.deepEqual(body, guideJSON855))
+    .reply(200, { thank: "you" });
+
+  const result = await handler(sampleTransactionProcessedEvent);
+
+  t.assert(
+    webhookRequest.isDone(),
+    "delivered guide JSON to destination webhook"
+  );
+
+  const bucketDestinationCall = buckets.commandCalls(DeleteObjectCommand, {
+    bucketName: "account_id-sftp",
+  });
+
+  t.is(bucketDestinationCall.length, 1);
+
+  t.deepEqual(result, {});
+});
+
+test.serial(
+  "does not delete input when source is artifact bucket",
+  async (t) => {
+    // loading incoming EDI file from S3
+    buckets.on(GetObjectCommand, {}).resolves({
+      body: sdkStreamMixin(
+        Readable.from([new TextEncoder().encode(JSON.stringify(guideJSON855))])
+      ),
+    });
+
+    stash
+      .on(GetValueCommand, {
+        key: `destinations|${partnershipId}|855`,
+      }) // mock destinations lookup
+      .resolvesOnce({
+        value: {
+          description:
+            "Purchase Order Acknowledgments received from ANOTHERMERCH",
+          destinations: [
+            {
+              destination: {
+                type: "webhook",
+                url: "https://webhook.site/TESTING",
+                verb: "POST",
+              },
+            },
+          ],
+        },
+      });
+
+    // mock destination webhook delivery
+    const webhookRequest = nock("https://webhook.site")
+      .post("/TESTING", (body) => t.deepEqual(body, guideJSON855))
+      .reply(200, { thank: "you" });
+
+    const transactionWithInputasAritfactBucket = structuredClone(
+      sampleTransactionProcessedEvent
+    );
+
+    const inputBucketName = "stedi-default-core-artifacts-1234";
+    sampleTransactionProcessedEvent.detail.input.bucketName = inputBucketName;
+    const result = await handler(transactionWithInputasAritfactBucket);
+
+    t.assert(
+      webhookRequest.isDone(),
+      "delivered guide JSON to destination webhook"
+    );
+
+    const bucketDestinationCall = buckets.commandCalls(DeleteObjectCommand, {
+      bucketName: inputBucketName,
+    });
+
+    t.is(bucketDestinationCall.length, 0);
+
+    t.deepEqual(result, {});
+  }
+);
diff --git a/src/functions/edi/inbound/__tests__/handler.success.ts b/src/functions/edi/inbound/__tests__/handler.success.ts
index 3f3b8dd..8d7e11f 100644
--- a/src/functions/edi/inbound/__tests__/handler.success.ts
+++ b/src/functions/edi/inbound/__tests__/handler.success.ts
@@ -100,7 +100,7 @@ test.serial(
   }
 );
 
-test.serial.only(
+test.serial(
   `delivers to webhook destination with edi when includeSource is set`,
   async (t) => {
     // loading incoming EDI file from S3
diff --git a/src/functions/edi/inbound/handler.ts b/src/functions/edi/inbound/handler.ts
index e3a3e1e..5107f6b 100644
--- a/src/functions/edi/inbound/handler.ts
+++ b/src/functions/edi/inbound/handler.ts
@@ -96,6 +96,7 @@ export const handler = async (
     await processDeliveries(processDeliveriesInput);
 
     // Delete the input file (it is archived by core)
+    // unless the file source is the core artifact bucket
     await ensureFileIsDeleted(
       transactionEvent.detail.input.bucketName,
       transactionEvent.detail.input.key
@@ -113,6 +114,9 @@ export const handler = async (
 };
 
 export const ensureFileIsDeleted = async (bucketName: string, key: string) => {
+  if (bucketName.startsWith("stedi-default-core-artifacts")) {
+    return;
+  }
   try {
     await buckets.send(new DeleteObjectCommand({ bucketName, key }));
   } catch (error) {