diff --git a/extensions/agent-context/scripts/python/update_agent_context.py b/extensions/agent-context/scripts/python/update_agent_context.py
index 15c0dceef9..fc8894ee14 100644
--- a/extensions/agent-context/scripts/python/update_agent_context.py
+++ b/extensions/agent-context/scripts/python/update_agent_context.py
@@ -11,8 +11,9 @@
 
 When ``plan_path`` is omitted, the script derives it from
 ``.specify/feature.json`` (written by /speckit-specify). Falls back to the most
-recently modified ``specs/*/plan.md`` only when feature.json is absent or its
-plan does not exist yet.
+recently modified ``plan.md`` anywhere under ``specs/`` (including nested scoped
+layouts such as ``specs/<scope>/<feature>/plan.md``) only when feature.json is
+absent or its plan does not exist yet.
 """
 
 from __future__ import annotations
@@ -173,7 +174,7 @@ def _resolve_plan_path(project_root: str) -> str:
     if not plan_path:
         root = Path(project_root).resolve()
         plans = sorted(
-            (root / "specs").glob("*/plan.md"),
+            (root / "specs").rglob("plan.md"),
             key=lambda p: p.stat().st_mtime,
             reverse=True,
         )
diff --git a/tests/extensions/test_update_agent_context_python_parity.py b/tests/extensions/test_update_agent_context_python_parity.py
index 92e8e20f8b..51d1831662 100644
--- a/tests/extensions/test_update_agent_context_python_parity.py
+++ b/tests/extensions/test_update_agent_context_python_parity.py
@@ -317,6 +317,27 @@ def test_python_mtime_fallback_matching_bash(tmp_path: Path) -> None:
     assert b"at specs/001-new/plan.md" in content
 
 
+@requires_posix_bash
+def test_python_mtime_fallback_finds_nested_plan_matching_bash(tmp_path: Path) -> None:
+    # Regression: the mtime fallback must discover plan.md in nested scoped
+    # layouts (specs/<scope>/<feature>/plan.md), matching the Bash/PowerShell
+    # ports and the documented recursive-discovery contract (see #3024). A
+    # one-level scan (specs/*/plan.md) would miss this and omit the plan link.
+    repo_a, repo_b = twin_projects(tmp_path, context_file="AGENTS.md")
+    for repo in (repo_a, repo_b):
+        plan = repo / "specs" / "scope-a" / "002-nested" / "plan.md"
+        plan.parent.mkdir(parents=True, exist_ok=True)
+        plan.write_text("# plan\n", encoding="utf-8")
+
+    bash = run_bash(repo_a)
+    py = run_python(repo_b)
+
+    assert_parity(bash, py, repo_a, repo_b)
+    content = (repo_b / "AGENTS.md").read_bytes()
+    assert content == (repo_a / "AGENTS.md").read_bytes()
+    assert b"at specs/scope-a/002-nested/plan.md" in content
+
+
 @requires_posix_bash
 def test_python_prefers_feature_json_over_mtime_matching_bash(tmp_path: Path) -> None:
     repo_a, repo_b = twin_projects(tmp_path, context_file="AGENTS.md")