diff --git a/js/src/client.ts b/js/src/client.ts
index 23f33d515..b3f0a1e03 100644
--- a/js/src/client.ts
+++ b/js/src/client.ts
@@ -2735,7 +2735,7 @@ export class Client implements LangSmithTracingClientInterface {
       // add attachments back to the example
       example.attachments = Object.entries(attachment_urls).reduce(
         (acc, [key, value]) => {
-          acc[key] = {
+          acc[key.slice("attachment.".length)] = {
             presigned_url: value.presigned_url,
           };
           return acc;
@@ -2832,7 +2832,7 @@ export class Client implements LangSmithTracingClientInterface {
         if (attachment_urls) {
           example.attachments = Object.entries(attachment_urls).reduce(
             (acc, [key, value]) => {
-              acc[key] = {
+              acc[key.slice("attachment.".length)] = {
                 presigned_url: value.presigned_url,
               };
               return acc;
diff --git a/js/src/tests/client.int.test.ts b/js/src/tests/client.int.test.ts
index 18582a01b..de8710e1f 100644
--- a/js/src/tests/client.int.test.ts
+++ b/js/src/tests/client.int.test.ts
@@ -1410,24 +1410,24 @@ test("update examples multipart", async () => {
   let updatedExample = await client.readExample(exampleId);
   expect(updatedExample.inputs.text).toEqual("hello world2");
   expect(Object.keys(updatedExample.attachments ?? {}).sort()).toEqual(
-    ["attachment.bar", "attachment.test_file"].sort()
+    ["bar", "test_file"].sort()
   );
   expect(updatedExample.metadata).toEqual({ bar: "foo" });
   let attachmentData: Uint8Array | undefined = updatedExample.attachments?.[
-    "attachment.test_file"
+    "test_file"
   ].presigned_url
     ? new Uint8Array(
         (await fetch(
-          updatedExample.attachments?.["attachment.test_file"].presigned_url
+          updatedExample.attachments?.["test_file"].presigned_url
         ).then((res) => res.arrayBuffer())) as ArrayBuffer
       )
     : undefined;
   expect(attachmentData).toEqual(new Uint8Array(fs.readFileSync(pathname)));
-  attachmentData = updatedExample.attachments?.["attachment.bar"].presigned_url
+  attachmentData = updatedExample.attachments?.["bar"].presigned_url
     ? new Uint8Array(
-        (await fetch(
-          updatedExample.attachments?.["attachment.bar"].presigned_url
-        ).then((res) => res.arrayBuffer())) as ArrayBuffer
+        (await fetch(updatedExample.attachments?.["bar"].presigned_url).then(
+          (res) => res.arrayBuffer()
+        )) as ArrayBuffer
       )
     : undefined;
   expect(attachmentData).toEqual(new Uint8Array(fs.readFileSync(pathname)));
@@ -1443,14 +1443,11 @@ test("update examples multipart", async () => {
   await client.updateExamplesMultipart(dataset.id, [exampleUpdate4]);
   updatedExample = await client.readExample(exampleId);
   expect(updatedExample.metadata).toEqual({ foo: "bar" });
-  expect(Object.keys(updatedExample.attachments ?? {})).toEqual([
-    "attachment.test_file2",
-  ]);
-  attachmentData = updatedExample.attachments?.["attachment.test_file2"]
-    .presigned_url
+  expect(Object.keys(updatedExample.attachments ?? {})).toEqual(["test_file2"]);
+  attachmentData = updatedExample.attachments?.["test_file2"].presigned_url
     ? new Uint8Array(
         (await fetch(
-          updatedExample.attachments?.["attachment.test_file2"].presigned_url
+          updatedExample.attachments?.["test_file2"].presigned_url
         ).then((res) => res.arrayBuffer())) as ArrayBuffer
       )
     : undefined;
@@ -1471,14 +1468,11 @@ test("update examples multipart", async () => {
     foo: "bar",
     dataset_split: ["foo", "bar"],
   });
-  expect(Object.keys(updatedExample.attachments ?? {})).toEqual([
-    "attachment.test_file",
-  ]);
-  attachmentData = updatedExample.attachments?.["attachment.test_file"]
-    .presigned_url
+  expect(Object.keys(updatedExample.attachments ?? {})).toEqual(["test_file"]);
+  attachmentData = updatedExample.attachments?.["test_file"].presigned_url
     ? new Uint8Array(
         (await fetch(
-          updatedExample.attachments?.["attachment.test_file"].presigned_url
+          updatedExample.attachments?.["test_file"].presigned_url
         ).then((res) => res.arrayBuffer())) as ArrayBuffer
       )
     : undefined;
diff --git a/js/src/tests/evaluate_attachments.int.test.ts b/js/src/tests/evaluate_attachments.int.test.ts
index 9a78a3f9a..0a64a54f9 100644
--- a/js/src/tests/evaluate_attachments.int.test.ts
+++ b/js/src/tests/evaluate_attachments.int.test.ts
@@ -34,19 +34,19 @@ test("evaluate can handle examples with attachments", async () => {
     config?: TargetConfigT
   ) => {
     // Verify we receive the attachment data
-    if (!config?.attachments?.["attachment.image"]) {
+    if (!config?.attachments?.["image"]) {
       throw new Error("Image attachment not found");
     }
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
     const attachmentData: Uint8Array | undefined = config?.attachments?.[
-      "attachment.image"
+      "image"
     ].presigned_url
       ? new Uint8Array(
-          (await fetch(
-            config?.attachments?.["attachment.image"].presigned_url
-          ).then((res) => res.arrayBuffer())) as ArrayBuffer
+          (await fetch(config?.attachments?.["image"].presigned_url).then(
+            (res) => res.arrayBuffer()
+          )) as ArrayBuffer
         )
       : undefined;
     if (!arraysEqual(attachmentData ?? new Uint8Array(), expectedData)) {
@@ -57,16 +57,15 @@ test("evaluate can handle examples with attachments", async () => {
 
   const customEvaluator = async ({ attachments }: { attachments?: any }) => {
     expect(attachments).toBeDefined();
-    expect(attachments?.["attachment.image"]).toBeDefined();
+    expect(attachments?.["image"]).toBeDefined();
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
-    const attachmentData: Uint8Array | undefined = attachments?.[
-      "attachment.image"
-    ].presigned_url
+    const attachmentData: Uint8Array | undefined = attachments?.["image"]
+      .presigned_url
       ? new Uint8Array(
-          (await fetch(attachments?.["attachment.image"].presigned_url).then(
-            (res) => res.arrayBuffer()
+          (await fetch(attachments?.["image"].presigned_url).then((res) =>
+            res.arrayBuffer()
           )) as ArrayBuffer
         )
       : undefined;
@@ -135,16 +134,15 @@ test("evaluate with attachments not in target function", async () => {
 
   const customEvaluator = async ({ attachments }: { attachments?: any }) => {
     expect(attachments).toBeDefined();
-    expect(attachments?.["attachment.image"]).toBeDefined();
+    expect(attachments?.["image"]).toBeDefined();
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
-    const attachmentData: Uint8Array | undefined = attachments?.[
-      "attachment.image"
-    ].presigned_url
+    const attachmentData: Uint8Array | undefined = attachments?.["image"]
+      .presigned_url
       ? new Uint8Array(
-          (await fetch(attachments?.["attachment.image"].presigned_url).then(
-            (res) => res.arrayBuffer()
+          (await fetch(attachments?.["image"].presigned_url).then((res) =>
+            res.arrayBuffer()
           )) as ArrayBuffer
         )
       : undefined;
@@ -212,19 +210,19 @@ test("multiple evaluators with attachments", async () => {
     config?: TargetConfigT
   ) => {
     // Verify we receive the attachment data
-    if (!config?.attachments?.["attachment.image"]) {
+    if (!config?.attachments?.["image"]) {
       throw new Error("Image attachment not found");
     }
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
     const attachmentData: Uint8Array | undefined = config?.attachments?.[
-      "attachment.image"
+      "image"
     ].presigned_url
       ? new Uint8Array(
-          (await fetch(
-            config?.attachments?.["attachment.image"].presigned_url
-          ).then((res) => res.arrayBuffer())) as ArrayBuffer
+          (await fetch(config?.attachments?.["image"].presigned_url).then(
+            (res) => res.arrayBuffer()
+          )) as ArrayBuffer
         )
       : undefined;
     if (!arraysEqual(attachmentData ?? new Uint8Array(), expectedData)) {
@@ -235,16 +233,15 @@ test("multiple evaluators with attachments", async () => {
 
   const customEvaluatorOne = async ({ attachments }: { attachments?: any }) => {
     expect(attachments).toBeDefined();
-    expect(attachments?.["attachment.image"]).toBeDefined();
+    expect(attachments?.["image"]).toBeDefined();
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
-    const attachmentData: Uint8Array | undefined = attachments?.[
-      "attachment.image"
-    ].presigned_url
+    const attachmentData: Uint8Array | undefined = attachments?.["image"]
+      .presigned_url
       ? new Uint8Array(
-          (await fetch(attachments?.["attachment.image"].presigned_url).then(
-            (res) => res.arrayBuffer()
+          (await fetch(attachments?.["image"].presigned_url).then((res) =>
+            res.arrayBuffer()
           )) as ArrayBuffer
         )
       : undefined;
@@ -259,16 +256,15 @@ test("multiple evaluators with attachments", async () => {
 
   const customEvaluatorTwo = async ({ attachments }: { attachments?: any }) => {
     expect(attachments).toBeDefined();
-    expect(attachments?.["attachment.image"]).toBeDefined();
+    expect(attachments?.["image"]).toBeDefined();
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
-    const attachmentData: Uint8Array | undefined = attachments?.[
-      "attachment.image"
-    ].presigned_url
+    const attachmentData: Uint8Array | undefined = attachments?.["image"]
+      .presigned_url
       ? new Uint8Array(
-          (await fetch(attachments?.["attachment.image"].presigned_url).then(
-            (res) => res.arrayBuffer()
+          (await fetch(attachments?.["image"].presigned_url).then((res) =>
+            res.arrayBuffer()
           )) as ArrayBuffer
         )
       : undefined;
@@ -333,19 +329,19 @@ test("evaluate with attachments runnable target function", async () => {
   await client.uploadExamplesMultipart(dataset.id, [example]);
 
   const myFunction = async (_input: any, config?: any) => {
-    if (!config?.attachments?.["attachment.image"]) {
+    if (!config?.attachments?.["image"]) {
       throw new Error("Image attachment not found");
     }
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
     const attachmentData: Uint8Array | undefined = config?.attachments?.[
-      "attachment.image"
+      "image"
     ].presigned_url
       ? new Uint8Array(
-          (await fetch(
-            config?.attachments?.["attachment.image"].presigned_url
-          ).then((res) => res.arrayBuffer())) as ArrayBuffer
+          (await fetch(config?.attachments?.["image"].presigned_url).then(
+            (res) => res.arrayBuffer()
+          )) as ArrayBuffer
         )
       : undefined;
     if (!arraysEqual(attachmentData ?? new Uint8Array(), expectedData)) {
@@ -359,16 +355,15 @@ test("evaluate with attachments runnable target function", async () => {
 
   const customEvaluator = async ({ attachments }: { attachments?: any }) => {
     expect(attachments).toBeDefined();
-    expect(attachments?.["attachment.image"]).toBeDefined();
+    expect(attachments?.["image"]).toBeDefined();
     const expectedData = new Uint8Array(
       Buffer.from("fake image data for testing")
     );
-    const attachmentData: Uint8Array | undefined = attachments?.[
-      "attachment.image"
-    ].presigned_url
+    const attachmentData: Uint8Array | undefined = attachments?.["image"]
+      .presigned_url
       ? new Uint8Array(
-          (await fetch(attachments?.["attachment.image"].presigned_url).then(
-            (res) => res.arrayBuffer()
+          (await fetch(attachments?.["image"].presigned_url).then((res) =>
+            res.arrayBuffer()
           )) as ArrayBuffer
         )
       : undefined;
diff --git a/python/langsmith/client.py b/python/langsmith/client.py
index a92a89659..f683a36f1 100644
--- a/python/langsmith/client.py
+++ b/python/langsmith/client.py
@@ -3900,7 +3900,7 @@ def read_example(
                 response = requests.get(value["presigned_url"], stream=True)
                 response.raise_for_status()
                 reader = io.BytesIO(response.content)
-                attachments[key.split(".")[1]] = {
+                attachments[key.removeprefix("attachment.")] = {
                     "presigned_url": value["presigned_url"],
                     "reader": reader,
                 }
@@ -3986,7 +3986,7 @@ def list_examples(
                     response = requests.get(value["presigned_url"], stream=True)
                     response.raise_for_status()
                     reader = io.BytesIO(response.content)
-                    attachments[key.split(".")[1]] = {
+                    attachments[key.removeprefix("attachment.")] = {
                         "presigned_url": value["presigned_url"],
                         "reader": reader,
                     }