diff --git a/src/cron/cron-service.ts b/src/cron/cron-service.ts
index 7b0a6599..b1d33cd6 100644
--- a/src/cron/cron-service.ts
+++ b/src/cron/cron-service.ts
@@ -536,11 +536,11 @@ export class CronService {
   }
 
   /**
-   * Resolves the prompt text and enforces the single-line constraint: prompt
-   * delivery rides writeViaMux/PTY writes where a newline is Enter, so a
-   * multi-line prompt would be silently corrupted (typed mode fuses lines,
-   * paste mode submits the first line and dribbles the rest in as separate
-   * messages). Rather than mangle an unattended agent's instructions, fail the
+   * Resolves the prompt text and enforces the single-line constraint: a job
+   * fires unattended, and the submit check that re-presses an ignored Enter
+   * cannot recognise a multi-line paste in the composer (typed mode), so a
+   * stranded prompt would go unnoticed; in paste mode the newlines reach the
+   * CLI as keys. Rather than risk an unattended agent's instructions, fail the
    * run with a clear error. A prompt FILE may end with trailing newline(s)
    * (every editor writes one) — those are stripped before the check.
    */
diff --git a/src/tmux-manager.ts b/src/tmux-manager.ts
index 8364cbeb..53cd3c89 100644
--- a/src/tmux-manager.ts
+++ b/src/tmux-manager.ts
@@ -4019,7 +4019,9 @@ export class TmuxManager extends EventEmitter implements TerminalMultiplexer {
 
   /**
    * Send input to a specific pane within a tmux session.
-   * Uses the same literal text approach as sendInput() but targets a specific pane.
+   * Types the text literally with `send-keys -l`, line breaks stripped, then Enter
+   * when the input carried a `\r`. Unlike sendInput(), it neither pastes nor keeps
+   * the line breaks of multi-line text.
    */
   sendInputToPane(muxName: string, paneTarget: string, input: string): boolean {
     if (IS_TEST_MODE) return true;
diff --git a/src/tui/tui-client.ts b/src/tui/tui-client.ts
index a78bf453..c4f035af 100644
--- a/src/tui/tui-client.ts
+++ b/src/tui/tui-client.ts
@@ -704,9 +704,9 @@ export class TuiClient {
    *
    * Two hard rules from CLAUDE.md, both enforced here so no caller can get them
    * wrong: the payload must END with `\r` or the server never issues Enter and
-   * the text sits unsubmitted, and embedded newlines are stripped rather than
-   * sent (the server would paste them as one block, which its submit check
-   * cannot reliably recognise in the composer).
+   * the text sits unsubmitted, and embedded newlines become spaces rather than
+   * being sent (the server would paste them as one block, which its submit
+   * check cannot reliably recognise in the composer).
    * The `clientId`/`seq` pair makes delivery exactly-once, so a retry after a
    * dropped connection cannot type the prompt twice.
    */
diff --git a/test/tui/tui-client.test.ts b/test/tui/tui-client.test.ts
index 59ab9844..8b78fdb8 100644
--- a/test/tui/tui-client.test.ts
+++ b/test/tui/tui-client.test.ts
@@ -327,7 +327,7 @@ describe('TuiClient.sendInput', () => {
     expect(JSON.parse(recorded[0].body)).toMatchObject({ input: 'hello world\r', useMux: true });
   });
 
-  it('collapses embedded newlines into spaces (multi-line breaks Ink)', async () => {
+  it('collapses embedded newlines into spaces (a multi-line paste cannot be confirmed as submitted)', async () => {
     await client().sendInput('abc', 'echo A\necho B\r\nline three  ');
     expect(JSON.parse(recorded[0].body).input).toBe('echo A echo B line three\r');
   });