diff --git a/docs/tasks/streams.mdx b/docs/tasks/streams.mdx
index c7498403c..e16f14550 100644
--- a/docs/tasks/streams.mdx
+++ b/docs/tasks/streams.mdx
@@ -670,6 +670,7 @@ Examples:
 - ✅ `https://api.trigger.dev/custom%3Fprefix%23segment` (percent-encoded `?` / `#`)
 - ✅ `\uFEFFhttps://api.trigger.dev/custom-prefix/\uFEFF` (BOM wrapper trimmed)
 - ❌ `\u2060https://api.trigger.dev/custom-prefix/\u2060` (word-joiner wrappers are rejected)
+- ❌ `\u200Bhttps://api.trigger.dev/custom-prefix/\u200B` (zero-width-space wrappers are rejected)
 - ❌ `https://api.trigger.dev?foo=bar`
 - ❌ `https://api.trigger.dev#fragment`
 - ❌ `https://user:pass@api.trigger.dev`
diff --git a/packages/ai/README.md b/packages/ai/README.md
index 7368bb542..e6af6818d 100644
--- a/packages/ai/README.md
+++ b/packages/ai/README.md
@@ -177,6 +177,7 @@ Examples:
 - ✅ `https://api.trigger.dev/custom%3Fprefix%23segment` (percent-encoded `?` / `#`)
 - ✅ `\uFEFFhttps://api.trigger.dev/custom-prefix/\uFEFF` (BOM wrapper trimmed)
 - ❌ `\u2060https://api.trigger.dev/custom-prefix/\u2060` (word-joiner wrappers are rejected)
+- ❌ `\u200Bhttps://api.trigger.dev/custom-prefix/\u200B` (zero-width-space wrappers are rejected)
 - ❌ `https://api.trigger.dev?foo=bar` (query string)
 - ❌ `https://api.trigger.dev#fragment` (hash fragment)
 - ❌ `https://user:pass@api.trigger.dev` (credentials)
diff --git a/packages/ai/src/chatTransport.test.ts b/packages/ai/src/chatTransport.test.ts
index 3b1dd54bc..e784a22e3 100644
--- a/packages/ai/src/chatTransport.test.ts
+++ b/packages/ai/src/chatTransport.test.ts
@@ -841,6 +841,17 @@ describe("TriggerChatTransport", function () {
     }).toThrowError("baseURL must not contain internal whitespace characters");
   });
 
+  it("throws when baseURL is wrapped with zero-width-space characters", function () {
+    expect(function () {
+      new TriggerChatTransport({
+        task: "chat-task",
+        accessToken: "pk_trigger",
+        baseURL: "\u200Bhttps://api.trigger.dev/custom-prefix/\u200B",
+        stream: "chat-stream",
+      });
+    }).toThrowError("baseURL must not contain internal whitespace characters");
+  });
+
   it("throws when baseURL contains internal zero-width-non-joiner characters", function () {
     expect(function () {
       new TriggerChatTransport({
@@ -3624,6 +3635,17 @@ describe("TriggerChatTransport", function () {
     }).toThrowError("baseURL must not contain internal whitespace characters");
   });
 
+  it("throws from factory when baseURL is wrapped with zero-width-space characters", function () {
+    expect(function () {
+      createTriggerChatTransport({
+        task: "chat-task",
+        accessToken: "pk_trigger",
+        baseURL: "\u200Bhttps://api.trigger.dev/custom-prefix/\u200B",
+        stream: "chat-stream",
+      });
+    }).toThrowError("baseURL must not contain internal whitespace characters");
+  });
+
   it("throws from factory when baseURL contains internal zero-width-non-joiner characters", function () {
     expect(function () {
       createTriggerChatTransport({