diff --git a/src/utils/claude-subcommand-detector.ts b/src/utils/claude-subcommand-detector.ts
index 9f425e82..4ecdaf8d 100644
--- a/src/utils/claude-subcommand-detector.ts
+++ b/src/utils/claude-subcommand-detector.ts
@@ -119,9 +119,11 @@ const SUBCOMMAND_ALLOWED_SESSION_FLAGS: Record<string, ReadonlySet<string>> = {
  *
  * Heuristic:
  *   1. Walk args until the `--` terminator or end.
- *   2. Skip known value-taking flags together with their next token.
- *   3. Skip unknown `--flag=value` forms and bare `--flag` / `-x` tokens.
- *   4. The first remaining positional token is the candidate.
+ *   2. If `--print` is present before the first positional token, treat as
+ *      prompt/headless session mode (never a subcommand launch).
+ *   3. Skip known value-taking flags together with their next token.
+ *   4. Skip unknown `--flag=value` forms and bare `--flag` / `-x` tokens.
+ *   5. The first remaining positional token is the candidate.
  *   5. Match against CLAUDE_SUBCOMMANDS.
  *
  * Anything after the candidate is irrelevant — once a subcommand is in play,
@@ -142,6 +144,8 @@ export function getClaudeSubcommandName(args: readonly string[]): string | null
     const arg = args[i];
     if (arg === '--') return null;
 
+    if (arg === '--print') return null;
+
     if (arg.startsWith('-')) {
       if (VALUE_TAKING_FLAGS.has(arg)) {
         // Skip the next token as the flag's value (when present and not another flag).
diff --git a/tests/unit/utils/claude-subcommand-detector.test.ts b/tests/unit/utils/claude-subcommand-detector.test.ts
index ae6f0488..27492e0c 100644
--- a/tests/unit/utils/claude-subcommand-detector.test.ts
+++ b/tests/unit/utils/claude-subcommand-detector.test.ts
@@ -56,6 +56,12 @@ describe('isClaudeSubcommandInvocation', () => {
     expect(isClaudeSubcommandInvocation(['--name', 'auth'])).toBe(false);
   });
 
+
+  it('treats --print prompt mode as non-subcommand even with subcommand-like prompt text', () => {
+    expect(isClaudeSubcommandInvocation(['--print', 'agents'])).toBe(false);
+    expect(isClaudeSubcommandInvocation(['--print', 'doctor'])).toBe(false);
+  });
+
   it('handles --flag=value forms', () => {
     expect(isClaudeSubcommandInvocation(['--model=sonnet', 'agents'])).toBe(true);
   });
@@ -201,6 +207,13 @@ describe('subcommand passthrough — injectors short-circuit', () => {
     expect(appendBrowserToolArgs(['remote-control'])).toEqual(['remote-control']);
   });
 
+
+  it('injectors still inject in --print prompt mode with subcommand-like prompt text', () => {
+    const out = appendThirdPartyWebSearchToolArgs(['--print', 'agents']);
+    expect(out).toContain('--append-system-prompt');
+    expect(out).toContain('--disallowedTools');
+  });
+
   it('injectors still inject for non-subcommand interactive launches', () => {
     const out = appendThirdPartyWebSearchToolArgs(['fix the bug']);
     expect(out).toContain('--append-system-prompt');