diff --git a/src/main/ports/advertised-url-watcher.test.ts b/src/main/ports/advertised-url-watcher.test.ts
index 3d9078b1613..443b2d4dd74 100644
--- a/src/main/ports/advertised-url-watcher.test.ts
+++ b/src/main/ports/advertised-url-watcher.test.ts
@@ -123,6 +123,18 @@ describe('AdvertisedUrlWatcher.ingest', () => {
     expect(watcher.lookup(WORKTREE, 3001)?.origin).toBe('https://local.getmontecarlo.com:3001')
   })
 
+  it('does not scan buffered PTY text until a line break arrives', () => {
+    const watcher = bindFresh()
+    const charCodeAtSpy = vi.spyOn(String.prototype, 'charCodeAt')
+    watcher.ingest(PTY, '  Network: https://local.getmontecarlo')
+    const charCodeAtCalls = charCodeAtSpy.mock.calls.length
+    charCodeAtSpy.mockRestore()
+
+    expect(charCodeAtCalls).toBe(0)
+    watcher.ingest(PTY, '.com:3001/\n')
+    expect(watcher.lookup(WORKTREE, 3001)?.origin).toBe('https://local.getmontecarlo.com:3001')
+  })
+
   it('reassembles an ANSI escape split across two chunks', () => {
     const watcher = bindFresh()
     watcher.ingest(PTY, '\x1b[32mhttps://example.com:3001/\x1b')
diff --git a/src/main/ports/advertised-url-watcher.ts b/src/main/ports/advertised-url-watcher.ts
index 3eb4d6f05b2..6e3b5a5f1a3 100644
--- a/src/main/ports/advertised-url-watcher.ts
+++ b/src/main/ports/advertised-url-watcher.ts
@@ -82,10 +82,14 @@ class PtyBuffer {
    *  and including the last newline). Whatever follows the last newline stays
    *  buffered so that a URL or ANSI sequence split across chunks survives. */
   ingest(chunk: string): string {
+    const chunkHasLineBreak = chunk.includes('\n') || chunk.includes('\r')
     this.raw += chunk
     if (this.raw.length > PER_PTY_BUFFER_LIMIT) {
       this.raw = this.raw.slice(-PER_PTY_BUFFER_LIMIT)
     }
+    if (!chunkHasLineBreak) {
+      return ''
+    }
     const lastNewline = lastLineBreak(this.raw)
     if (lastNewline === -1) {
       return ''