diff --git a/.changeset/fn-7510-oversight-default.md b/.changeset/fn-7510-oversight-default.md
new file mode 100644
index 0000000000..94cce48169
--- /dev/null
+++ b/.changeset/fn-7510-oversight-default.md
@@ -0,0 +1,7 @@
+---
+"@runfusion/fusion": minor
+---
+
+summary: Planner oversight now defaults to full steering/control for every workflow unless explicitly changed.
+category: feature
+dev: Confirms the `plannerOversightLevel` workflow-setting default is the highest (autonomous) level; unset workflow value and unset per-task override both resolve to full steering via `resolveEffectivePlannerOversightLevel` (task override → workflow effective value → autonomous), adding dedicated regression coverage for the "unless explicitly disabled" precedence.
diff --git a/docs/workflow-steps.md b/docs/workflow-steps.md
index 5ec0fcb37d..d0ade45c00 100644
--- a/docs/workflow-steps.md
+++ b/docs/workflow-steps.md
@@ -837,8 +837,13 @@ automatic large-task splitting guidance for oversized M/L work. Set it to `false
 in a workflow's Values tab when triage should keep large tasks whole unless the
 task explicitly has `breakIntoSubtasks: true`; explicit subtask requests still
 follow the mandatory split flow. Planner oversight uses `plannerOversightLevel`
-(default `autonomous`) with `off`, `observe`, `steer`, and `autonomous` values;
-per-task override and engine runtime behavior are follow-up work. See
+(default `autonomous`) with `off`, `observe`, `steer`, and `autonomous` values —
+full steering/control is ON for every workflow unless explicitly changed. Tasks
+may set a nullable `Task.plannerOversightLevel` override that wins over the
+workflow value when present; `resolveEffectivePlannerOversightLevel` in
+`@fusion/core` resolves the effective level as task override → workflow
+effective value → `autonomous`. The overseer runtime/monitoring behavior that
+acts on this level is still follow-up work (FN-7511+). See
 [Settings Reference → Workflow Settings](./settings-reference.md#workflow-settings)
 for the full moved-key catalog, the editor walkthrough, and the export/sync posture.
 
diff --git a/packages/core/src/__tests__/plannerOversightLevel-default.test.ts b/packages/core/src/__tests__/plannerOversightLevel-default.test.ts
new file mode 100644
index 0000000000..d28839ebb8
--- /dev/null
+++ b/packages/core/src/__tests__/plannerOversightLevel-default.test.ts
@@ -0,0 +1,79 @@
+/*
+ * FNXC:PlannerOversight 2026-07-04-13:00:
+ * FN-7510 dedicated regression coverage: planner oversight defaults to full
+ * steering/control ("autonomous") for every workflow unless explicitly
+ * disabled at the workflow-setting scope or the per-task override scope.
+ * Precedence is task override -> workflow effective value -> "autonomous"
+ * declaration default (see resolveEffectivePlannerOversightLevel).
+ */
+import { describe, it, expect, vi } from "vitest";
+
+import { BUILTIN_OVERSIGHT_SETTINGS, BUILTIN_WORKFLOW_SETTINGS } from "../builtin-workflow-settings.js";
+import { DEFAULT_PLANNER_OVERSIGHT_LEVEL } from "../types.js";
+import {
+  resolveEffectiveSettingsById,
+  resolveEffectivePlannerOversightLevel,
+  type WorkflowSettingsResolverStore,
+} from "../workflow-settings-resolver.js";
+
+const PROJECT = "proj-1";
+
+function makeStore(values?: Record<string, unknown>): WorkflowSettingsResolverStore {
+  return {
+    getTaskWorkflowSelection: vi.fn(() => undefined),
+    getWorkflowDefinition: vi.fn(async () => undefined),
+    getWorkflowSettingValues: vi.fn(() => values ?? {}),
+    getWorkflowSettingsProjectId: vi.fn(() => PROJECT),
+  };
+}
+
+describe("plannerOversightLevel default (FN-7510)", () => {
+  it("(a) the declaration default is the full-steering value 'autonomous'", () => {
+    const decl = BUILTIN_OVERSIGHT_SETTINGS.find((s) => s.id === "plannerOversightLevel");
+    expect(decl).toBeDefined();
+    expect(decl?.default).toBe("autonomous");
+    expect(decl?.default).toBe(DEFAULT_PLANNER_OVERSIGHT_LEVEL);
+    // The declaration lives in the composed catalog every built-in workflow spreads.
+    expect(BUILTIN_WORKFLOW_SETTINGS.some((s) => s.id === "plannerOversightLevel")).toBe(true);
+  });
+
+  it("(b) resolveEffectiveSettingsById for a built-in workflow with no stored value returns full steering", async () => {
+    const store = makeStore({});
+    const eff = await resolveEffectiveSettingsById(store, "builtin:coding", PROJECT);
+    expect(eff.plannerOversightLevel).toBe("autonomous");
+  });
+
+  it("(c) an explicit stored workflow value overrides the default ('off')", async () => {
+    const store = makeStore({ plannerOversightLevel: "off" });
+    const eff = await resolveEffectiveSettingsById(store, "builtin:coding", PROJECT);
+    expect(eff.plannerOversightLevel).toBe("off");
+  });
+
+  it("(c) an explicit stored workflow value overrides the default ('steer')", async () => {
+    const store = makeStore({ plannerOversightLevel: "steer" });
+    const eff = await resolveEffectiveSettingsById(store, "builtin:coding", PROJECT);
+    expect(eff.plannerOversightLevel).toBe("steer");
+  });
+
+  it("(d) an unset per-task override falls through to the workflow/default level", () => {
+    expect(resolveEffectivePlannerOversightLevel(undefined, "autonomous")).toBe("autonomous");
+    expect(resolveEffectivePlannerOversightLevel(null, "steer")).toBe("steer");
+  });
+
+  it("(d) an explicit per-task override wins over the workflow value", () => {
+    expect(resolveEffectivePlannerOversightLevel("steer", "autonomous")).toBe("steer");
+    expect(resolveEffectivePlannerOversightLevel("off", "autonomous")).toBe("off");
+  });
+
+  it("(e) 'off' is honored at the workflow scope when no task override is set", () => {
+    expect(resolveEffectivePlannerOversightLevel(undefined, "off")).toBe("off");
+  });
+
+  it("(e) 'off' is honored at the per-task scope even when the workflow value is full steering", () => {
+    expect(resolveEffectivePlannerOversightLevel("off", "autonomous")).toBe("off");
+  });
+
+  it("both workflow value and task override unset resolve to full steering (unless-explicitly-disabled)", () => {
+    expect(resolveEffectivePlannerOversightLevel(undefined, undefined)).toBe(DEFAULT_PLANNER_OVERSIGHT_LEVEL);
+  });
+});