diff --git a/loopx/control_plane/effect_runtime_handlers.ts b/loopx/control_plane/effect_runtime_handlers.ts
index dff62be072..236066a588 100644
--- a/loopx/control_plane/effect_runtime_handlers.ts
+++ b/loopx/control_plane/effect_runtime_handlers.ts
@@ -465,6 +465,7 @@ export function createEffectRuntimeHandlers(
       lazyHandler(() => import("./coordination/legacy_writer_fence.ts"), ({checkLegacyCoordinationWriteAllowed}) => checkLegacyCoordinationWriteAllowed),
     ],
     ["task_lease.write_scopes.overlap", lazyHandler(() => import("./work_items/task_lease_acquire_decision.ts"), ({evaluateTaskLeaseWriteScopesOverlap}) => evaluateTaskLeaseWriteScopesOverlap)],
+    ["quota.task_orchestration.write_scope_overlap", lazyHandler(() => import("./work_items/task_lease_acquire_decision.ts"), ({evaluateQuotaSchedulingWriteScopesOverlap}) => evaluateQuotaSchedulingWriteScopesOverlap)],
     ["quota.monitor_poll.commit", lazyHandler(() => import("./quota/monitor_poll_commit.ts"), ({evaluateQuotaMonitorPollCommit}) => evaluateQuotaMonitorPollCommit)],
     ["presentation.decision_notice.project", lazyHandler(() => import("./presentation/decision_notice.ts"), ({projectDecisionNotice}) => projectDecisionNotice)],
     ["presentation.decision_notice.validate_references", lazyHandler(() => import("./presentation/decision_notice.ts"), ({validateDecisionNoticeReferences}) => validateDecisionNoticeReferences)],
diff --git a/loopx/control_plane/quota/task_orchestration_admission.py b/loopx/control_plane/quota/task_orchestration_admission.py
index dd2c40cb26..2d1e0e7eeb 100644
--- a/loopx/control_plane/quota/task_orchestration_admission.py
+++ b/loopx/control_plane/quota/task_orchestration_admission.py
@@ -1,11 +1,11 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from fnmatch import fnmatchcase
 from typing import Any
 
 from ..agents.capability_gate import missing_required_capabilities
 from ..agents.runtime_model import peer_work_key, select_peer_for_work
+from ..effect_runtime import effect_runtime_result
 from ..todos.contract import (
     normalize_required_capabilities,
     normalize_required_write_scopes,
@@ -472,37 +472,19 @@ def _write_scopes_conflict(
     left: _NormalizedAdmissionLane,
     right: _NormalizedAdmissionLane,
 ) -> bool:
+    """Consume the scheduling overlap decision owned by the canonical lease module."""
+
     if not left.required_write_scopes or not right.required_write_scopes:
         return False
     if left.effective_repository != right.effective_repository:
         return False
-    return any(
-        _scope_patterns_overlap(left_scope, right_scope)
-        for left_scope in left.required_write_scopes
-        for right_scope in right.required_write_scopes
-    )
-
-
-def _scope_patterns_overlap(left: str, right: str) -> bool:
-    if left == right or fnmatchcase(left, right) or fnmatchcase(right, left):
-        return True
-    left_prefix = _scope_static_prefix(left)
-    right_prefix = _scope_static_prefix(right)
-    return bool(
-        left_prefix
-        and right_prefix
-        and (
-            left_prefix == right_prefix
-            or left_prefix.startswith(f"{right_prefix}/")
-            or right_prefix.startswith(f"{left_prefix}/")
-        )
+    decision = effect_runtime_result(
+        "quota.task_orchestration.write_scope_overlap",
+        {
+            "left": list(left.required_write_scopes),
+            "right": list(right.required_write_scopes),
+        },
     )
-
-
-def _scope_static_prefix(scope: str) -> str:
-    parts: list[str] = []
-    for part in str(scope or "").strip("/").split("/"):
-        if any(marker in part for marker in ("*", "?", "[")):
-            break
-        parts.append(part)
-    return "/".join(parts)
+    if not isinstance(decision, dict) or not isinstance(decision.get("overlap"), bool):
+        raise RuntimeError("quota scheduling write-scope decision shape mismatch")
+    return bool(decision["overlap"])
diff --git a/loopx/control_plane/work_items/task_lease_acquire_decision.ts b/loopx/control_plane/work_items/task_lease_acquire_decision.ts
index 3b3df2ad7f..cf7ca25609 100644
--- a/loopx/control_plane/work_items/task_lease_acquire_decision.ts
+++ b/loopx/control_plane/work_items/task_lease_acquire_decision.ts
@@ -451,6 +451,42 @@ export function evaluateTaskLeaseWriteScopesOverlap(value: unknown): JsonObject
   };
 }
 
+/** Literal segments before the first wildcard, folded for comparison. */
+function schedulingScopeRoot(scope: string): string {
+  const parts: string[] = [];
+  for (const part of scope.replace(/^\/+|\/+$/gu, "").split("/")) {
+    if (part.includes("*") || part.includes("?") || part.includes("[")) break;
+    parts.push(part);
+  }
+  return caseFold(parts.join("/"));
+}
+
+function schedulingScopePairOverlaps(left: string, right: string): boolean {
+  if (scopePairOverlaps(left, right)) return true;
+  const leftRoot = schedulingScopeRoot(left);
+  const rightRoot = schedulingScopeRoot(right);
+  return Boolean(leftRoot && rightRoot && (
+    leftRoot === rightRoot ||
+    leftRoot.startsWith(`${rightRoot}/`) ||
+    rightRoot.startsWith(`${leftRoot}/`)
+  ));
+}
+
+/**
+ * Quota scheduling keeps its own subtree rule: a literal scope owns the paths
+ * below it even without a trailing slash. That rule is wider than the canonical
+ * lease rule, so this entry point composes the two instead of restating the
+ * case fold or the glob matcher.
+ */
+export function evaluateQuotaSchedulingWriteScopesOverlap(value: unknown): JsonObject {
+  const input = requireJsonObject(value, "quota scheduling write-scope overlap");
+  const left = comparisonWriteScopes(decisionStringArray(input.left, "left"));
+  const right = comparisonWriteScopes(decisionStringArray(input.right, "right"));
+  const overlap = left.length > 0 && right.length > 0 &&
+    left.some((first) => right.some((second) => schedulingScopePairOverlaps(first, second)));
+  return {overlap};
+}
+
 function decisionBoolean(value: unknown, label: string): boolean {
   if (typeof value !== "boolean") {
     throw new EffectRuntimeRequestError(`${label} must be a boolean`);
diff --git a/tests/control_plane/test_task_orchestration_admission.py b/tests/control_plane/test_task_orchestration_admission.py
index 4ed92c4b44..46609dc8da 100644
--- a/tests/control_plane/test_task_orchestration_admission.py
+++ b/tests/control_plane/test_task_orchestration_admission.py
@@ -264,6 +264,98 @@ def test_admission_serializes_overlapping_write_scopes() -> None:
     ]
 
 
+def _scope_contract(
+    items: list[dict[str, Any]],
+    *,
+    goal_write_scope: list[str],
+) -> dict[str, Any] | None:
+    summary = {"items": items}
+    contract, _work_lane = apply_task_orchestration_contract(
+        fallback_work_lane_contract={"lane": "advancement_task"},
+        goal_boundary={
+            "write_scope": goal_write_scope,
+            "orchestration": {
+                "mode": "multi_subagent",
+                "spawn_allowed": True,
+                "max_children": 2,
+            },
+        },
+        agent_identity={
+            "agent_id": AGENT_ID,
+            "registered_agents": [AGENT_ID],
+        },
+        agent_todo_summary=summary,
+        raw_agent_todo_summary=summary,
+        raw_user_todo_summary={"items": []},
+        available_capabilities=["subagent_spawn"],
+    )
+    return contract
+
+
+def test_admission_serializes_case_alias_write_scopes() -> None:
+    contract = _scope_contract(
+        [
+            _todo("todo_primary", action_kind="implement", required_write_scopes=["src/Main.ts"]),
+            _todo("todo_case_alias", action_kind="implement", required_write_scopes=["src/main.ts"]),
+            _todo("todo_independent", action_kind="implement", required_write_scopes=["src/other.ts"]),
+        ],
+        goal_write_scope=["src/**"],
+    )
+
+    assert contract is not None
+    assert [lane["todo_id"] for lane in contract["eligible_child_lanes"]] == [
+        "todo_independent"
+    ]
+    assert contract["blocked_lanes"] == [
+        {
+            "todo_id": "todo_case_alias",
+            "task_domain": "code",
+            "reason_codes": ["write_scope_conflict"],
+            "conflicts_with_todo_id": "todo_primary",
+        }
+    ]
+
+
+def test_admission_keeps_scheduling_subtree_containment_without_a_trailing_slash() -> None:
+    contract = _scope_contract(
+        [
+            _todo("todo_primary", action_kind="implement", required_write_scopes=["src"]),
+            _todo("todo_below", action_kind="implement", required_write_scopes=["src/a.ts"]),
+            _todo("todo_independent", action_kind="implement", required_write_scopes=["tests/a.py"]),
+        ],
+        goal_write_scope=["src", "src/**", "tests/**"],
+    )
+
+    assert contract is not None
+    assert [lane["todo_id"] for lane in contract["eligible_child_lanes"]] == [
+        "todo_independent"
+    ]
+    assert contract["blocked_lanes"] == [
+        {
+            "todo_id": "todo_below",
+            "task_domain": "code",
+            "reason_codes": ["write_scope_conflict"],
+            "conflicts_with_todo_id": "todo_primary",
+        }
+    ]
+
+
+def test_admission_leaves_sibling_files_independent() -> None:
+    contract = _scope_contract(
+        [
+            _todo("todo_primary", action_kind="implement", required_write_scopes=["src/a.ts"]),
+            _todo("todo_sibling", action_kind="implement", required_write_scopes=["src/b.ts"]),
+        ],
+        goal_write_scope=["src/**"],
+    )
+
+    assert contract is not None
+    assert [lane["todo_id"] for lane in contract["eligible_child_lanes"]] == [
+        "todo_sibling"
+    ]
+    assert contract["blocked_lanes"] == []
+
+
 def test_admission_serializes_implicit_and_explicit_goal_repository_scopes() -> None:
     summary = {
         "items": [
diff --git a/tests/control_plane_ts/effect_runtime_handlers.test.ts b/tests/control_plane_ts/effect_runtime_handlers.test.ts
index 3c14d35d68..1de7f3e0cf 100644
--- a/tests/control_plane_ts/effect_runtime_handlers.test.ts
+++ b/tests/control_plane_ts/effect_runtime_handlers.test.ts
@@ -78,6 +78,41 @@ test("runtime exposes the canonical task-lease write-scope rule", async () => {
   assert.equal(result.overlap, true);
 });
 
+test("scheduling write-scope overlap folds case and keeps subtree containment", async () => {
+  const rows: [string, string, boolean][] = [
+    ["src/Main.ts", "src/main.ts", true],
+    ["src/MAIN.ts", "src/main.ts", true],
+    ["src/\u03a3.ts", "src/\u03c2.ts", true],
+    ["src/\u00df.ts", "src/SS.ts", true],
+    ["src/", "SRC/", true],
+    ["src/", "src/a.ts", true],
+    ["src/*.ts", "src/*.TS", true],
+    ["src/*.ts", "src/a.ts", true],
+    ["src/a.ts", "src/b.ts", false],
+    ["src/main.ts", "src/other.ts", false],
+    ["src/a.ts", "src/a.txt", false],
+    ["src", "src/a.ts", true],
+    ["src/main", "src/main/x", true],
+    ["src/a", "src/a/b", true],
+    ["src/a.ts", "src/a.ts/b", true],
+  ];
+  for (const [left, right, overlap] of rows) {
+    const scheduling = await dispatchEffectRuntimeMethod(
+      handlers,
+      "quota.task_orchestration.write_scope_overlap",
+      { left: [left], right: [right] },
+    ) as Record<string, unknown>;
+    assert.equal(scheduling.overlap, overlap, `scheduling ${left} vs ${right}`);
+  }
+  // The scheduling entry point stays wider than the canonical lease rule.
+  const canonical = await dispatchEffectRuntimeMethod(
+    handlers,
+    "task_lease.write_scopes.overlap",
+    { left: ["src"], right: ["src/a.ts"] },
+  ) as Record<string, unknown>;
+  assert.equal(canonical.overlap, false);
+});
+
 test("runtime exposes the source-session lifetime decisions", async () => {
   const goalRef = {
     goal_id: "release",