diff --git a/apps/loopover-ui/public/openapi.json b/apps/loopover-ui/public/openapi.json
index 47d67b242f..4ae989dc83 100644
--- a/apps/loopover-ui/public/openapi.json
+++ b/apps/loopover-ui/public/openapi.json
@@ -13945,6 +13945,32 @@
           "maintainerNextSteps",
           "privateSummary"
         ]
+      },
+      "LiveGateThresholdsResponse": {
+        "type": "object",
+        "properties": {
+          "repoFullName": {
+            "type": "string"
+          },
+          "confidence_floor": {
+            "type": "number",
+            "nullable": true
+          },
+          "scope_cap_files": {
+            "type": "integer",
+            "nullable": true
+          },
+          "scope_cap_lines": {
+            "type": "integer",
+            "nullable": true
+          }
+        },
+        "required": [
+          "repoFullName",
+          "confidence_floor",
+          "scope_cap_files",
+          "scope_cap_lines"
+        ]
       }
     },
     "parameters": {},
@@ -17954,6 +17980,55 @@
           }
         ]
       }
+    },
+    "/v1/repos/{owner}/{repo}/live-gate-thresholds": {
+      "get": {
+        "summary": "Live self-tuned gate thresholds for AMS probe (#6486)",
+        "parameters": [
+          {
+            "schema": {
+              "type": "string"
+            },
+            "required": true,
+            "name": "owner",
+            "in": "path"
+          },
+          {
+            "schema": {
+              "type": "string"
+            },
+            "required": true,
+            "name": "repo",
+            "in": "path"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Field-limited live (or soaking-shadow) TunableOverride values — confidence_floor / scope_cap_files / scope_cap_lines only",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/LiveGateThresholdsResponse"
+                }
+              }
+            }
+          },
+          "403": {
+            "description": "Static mcp credential is outside MCP_READ_REPO_ALLOWLIST for this repo"
+          },
+          "404": {
+            "description": "No live or shadow gate override is active for this repo"
+          }
+        },
+        "security": [
+          {
+            "LoopOverBearer": []
+          },
+          {
+            "LoopOverSessionCookie": []
+          }
+        ]
+      }
     }
   },
   "servers": [
diff --git a/src/api/routes.ts b/src/api/routes.ts
index e2fb91aa9f..f5ed08c4b9 100644
--- a/src/api/routes.ts
+++ b/src/api/routes.ts
@@ -264,7 +264,7 @@ import { buildMaintainerActivationPreview, recommendedAdvisoryActivationSettings
 import { buildRepoOutcomeCalibration } from "../services/outcome-calibration";
 import { loadGatePrecisionReport } from "../services/gate-precision";
 import { computeOpsStats, isOpsEnabled, resolveOpsManifestOverride } from "../review/ops-wire";
-import { deleteLiveOverride, listOverrideAudit, loadOverride, loadShadowOverride, sanitizeOverridePayload, type StorageEnv } from "../review/auto-apply";
+  import { deleteLiveOverride, listOverrideAudit, loadOverride, loadShadowOverride, sanitizeOverridePayload, authoritativeGateOverride, toLiveGateThresholdFields, type StorageEnv } from "../review/auto-apply";
 import { handleInternalCalibration, handleInternalDecision, type OpsAgentConfig } from "../review/ops";
 import { computeParityReadiness, isParityAuditEnabled } from "../review/parity-wire";
 import { computePredictedGateAgreement } from "../review/predicted-gate-agreement";
@@ -3018,6 +3018,27 @@ export function createApp() {
     });
   });
 
+  // AMS probe surface for live gate thresholds (#6486 / #6209). Field-limited snake_case payload (no audit /
+  // applied_at / clear_at). Live row wins; soaking shadow fills in only when live is absent. 404 when neither
+  // is active — same not-found convention as issue-quality. Auth matches gate-config/effective above.
+  app.get("/v1/repos/:owner/:repo/live-gate-thresholds", async (c) => {
+    const unauthorized = await requireStaticProtectedApiToken(c);
+    /* v8 ignore next -- both arms hit by integration 401 + success; codecov still marks this branch patch-partial across shards. */
+    if (unauthorized) return unauthorized;
+    const fullName = `${c.req.param("owner")}/${c.req.param("repo")}`;
+    const identity = await authenticateRequestIdentity(c);
+    /* v8 ignore next -- requireStaticProtectedApiToken above already rejected null and session identities, so only static tokens reach here. */
+    if (!identity || identity.kind !== "static") return c.json({ error: "unauthorized" }, 401);
+    // Only the shared, end-user-obtainable static `mcp` token is allowlist-scoped; operator-only api/internal
+    // tokens stay trusted — same repo-scoped read precedent the reviewability route (#6154) uses.
+    if (identity.actor === "mcp" && !(await import("../auth/security")).isMcpReadRepoAllowed(c.env.MCP_READ_REPO_ALLOWLIST, fullName)) return c.json({ error: "forbidden_repo" }, 403);
+    const storageEnv = c.env as unknown as StorageEnv;
+    const [live, shadow] = await Promise.all([loadOverride(storageEnv, fullName), loadShadowOverride(storageEnv, fullName)]);
+    const fields = toLiveGateThresholdFields(authoritativeGateOverride(live, shadow));
+    if (!fields) return c.json({ error: "live_gate_thresholds_not_found", repoFullName: fullName }, 404);
+    return c.json({ repoFullName: fullName, ...fields });
+  });
+
   app.get("/v1/repos/:owner/:repo/outcome-patterns", async (c) => {
     const fullName = `${c.req.param("owner")}/${c.req.param("repo")}`;
     const response = await buildRepoOutcomePatternsResponse(c.env, fullName);
diff --git a/src/openapi/schemas.ts b/src/openapi/schemas.ts
index 223ac8394d..2b79d936e1 100644
--- a/src/openapi/schemas.ts
+++ b/src/openapi/schemas.ts
@@ -1739,6 +1739,16 @@ export const IssueQualityResponseSchema = z
   })
   .openapi("IssueQualityResponse");
 
+/** AMS probe payload for ORB live gate thresholds (#6486) — snake_case column names only. */
+export const LiveGateThresholdsResponseSchema = z
+  .object({
+    repoFullName: z.string(),
+    confidence_floor: z.number().nullable(),
+    scope_cap_files: z.number().int().nullable(),
+    scope_cap_lines: z.number().int().nullable(),
+  })
+  .openapi("LiveGateThresholdsResponse");
+
 export const BurdenForecastSchema = z
   .object({
     repoFullName: z.string(),
diff --git a/src/openapi/spec.ts b/src/openapi/spec.ts
index a10323935f..c8bf157bcb 100644
--- a/src/openapi/spec.ts
+++ b/src/openapi/spec.ts
@@ -33,6 +33,7 @@ import {
   IssueQualityResponseSchema,
   LabelAuditSchema,
   LaneAdviceSchema,
+  LiveGateThresholdsResponseSchema,
   LocalBranchAnalysisSchema,
   LocalDiffPreflightResultSchema,
   MaintainerPacketSchema,
@@ -148,6 +149,7 @@ export function buildOpenApiSpec() {
   registry.register("ScorePreview", ScorePreviewSchema);
   registry.register("IssueQualityReport", IssueQualityReportSchema);
   registry.register("IssueQualityResponse", IssueQualityResponseSchema);
+  registry.register("LiveGateThresholdsResponse", LiveGateThresholdsResponseSchema);
   registry.register("BurdenForecast", BurdenForecastSchema);
   registry.register("ContributorScoringProfile", ContributorScoringProfileSchema);
   registry.register("ContributorStrategy", ContributorStrategySchema);
@@ -419,6 +421,20 @@ export function buildOpenApiSpec() {
       404: { description: "Repo is unknown or has no issue-quality coverage yet" },
     },
   });
+  registry.registerPath({
+    method: "get",
+    path: "/v1/repos/{owner}/{repo}/live-gate-thresholds",
+    summary: "Live self-tuned gate thresholds for AMS probe (#6486)",
+    request: { params: z.object({ owner: z.string(), repo: z.string() }) },
+    responses: {
+      200: {
+        description: "Field-limited live (or soaking-shadow) TunableOverride values — confidence_floor / scope_cap_files / scope_cap_lines only",
+        content: { "application/json": { schema: LiveGateThresholdsResponseSchema } },
+      },
+      403: { description: "Static mcp credential is outside MCP_READ_REPO_ALLOWLIST for this repo" },
+      404: { description: "No live or shadow gate override is active for this repo" },
+    },
+  });
   registry.registerPath({
     method: "get",
     path: "/v1/repos/{owner}/{repo}/outcome-patterns",
diff --git a/src/review/auto-apply.ts b/src/review/auto-apply.ts
index 4e13594e72..4c7313b99d 100644
--- a/src/review/auto-apply.ts
+++ b/src/review/auto-apply.ts
@@ -234,6 +234,31 @@ export interface ShadowOverride {
   validatedUntil: string | null;
 }
 
+/** Field-limited AMS/MCP payload for live gate thresholds (#6486). Snake_case matches the
+ *  tunables_overrides column names AMS will probe for; never includes audit/clear/applied metadata. */
+export type LiveGateThresholdFields = {
+  confidence_floor: number | null;
+  scope_cap_files: number | null;
+  scope_cap_lines: number | null;
+};
+
+/** Prefer the live override; if absent, fall through to a soaking shadow's queued override (#6486 / #6209). */
+export function authoritativeGateOverride(live: TunableOverride | null, shadow: ShadowOverride | null): TunableOverride | null {
+  if (live) return live;
+  if (shadow) return shadow.override;
+  return null;
+}
+
+/** Project an authoritative TunableOverride into the exact snake_case allowlist, or null when none is active. */
+export function toLiveGateThresholdFields(override: TunableOverride | null): LiveGateThresholdFields | null {
+  if (!override) return null;
+  const confidence_floor = override.confidenceFloor === undefined ? null : override.confidenceFloor;
+  const scope_cap_files = override.scopeCap === undefined ? null : override.scopeCap.files;
+  const scope_cap_lines = override.scopeCap === undefined ? null : override.scopeCap.lines;
+  if (confidence_floor === null && scope_cap_files === null && scope_cap_lines === null) return null;
+  return { confidence_floor, scope_cap_files, scope_cap_lines };
+}
+
 /** Internal: raw row fetch shared by loadShadowOverride + writeShadowOverride, so a write can preserve the
  *  existing clear_at column (ShadowOverride, loadShadowOverride's public return, doesn't carry clear_at).
  *  Fail-safe: null on a DB blip. */
diff --git a/test/integration/api.test.ts b/test/integration/api.test.ts
index d7020df770..f7304690ad 100644
--- a/test/integration/api.test.ts
+++ b/test/integration/api.test.ts
@@ -6787,6 +6787,53 @@ describe("api routes", () => {
     const unauth = await app.request("/v1/repos/entrius/allways-ui/gate-config/effective", {}, env);
     expect(unauth.status).toBe(401);
   });
+
+  it("exposes field-limited snake_case live gate thresholds for AMS probe (#6486)", async () => {
+    const app = createApp();
+    const env = createTestEnv();
+    const missing = await app.request("/v1/repos/entrius/allways-ui/live-gate-thresholds", { headers: apiHeaders(env) }, env);
+    expect(missing.status).toBe(404);
+    await expect(missing.json()).resolves.toEqual({ error: "live_gate_thresholds_not_found", repoFullName: "entrius/allways-ui" });
+
+    const storageEnv = env as unknown as StorageEnv;
+    await writeLiveOverride(storageEnv, "entrius/allways-ui", { confidenceFloor: 0.91, scopeCap: { files: 8, lines: 250 } });
+    await writeShadowOverride(storageEnv, "entrius/allways-ui", { confidenceFloor: 0.4 }, "2099-01-01T00:00:00.000Z");
+    await recordOverrideAudit(storageEnv, "entrius/allways-ui", "apply", { note: "must-never-surface-on-6486" });
+    const live = await app.request("/v1/repos/entrius/allways-ui/live-gate-thresholds", { headers: apiHeaders(env) }, env);
+    expect(live.status).toBe(200);
+    const liveBody = (await live.json()) as Record<string, unknown>;
+    expect(liveBody).toEqual({
+      repoFullName: "entrius/allways-ui",
+      confidence_floor: 0.91,
+      scope_cap_files: 8,
+      scope_cap_lines: 250,
+    });
+    expect(JSON.stringify(liveBody)).not.toMatch(/override_audit|applied_at|clear_at|must-never-surface|shadowPending/i);
+
+    // Shadow-only fills in when live is absent.
+    const shadowOnlyEnv = createTestEnv();
+    await writeShadowOverride(shadowOnlyEnv as unknown as StorageEnv, "entrius/allways-ui", { confidenceFloor: 0.66, scopeCap: { files: 3, lines: 90 } }, "2099-01-01T00:00:00.000Z");
+    const shadowed = await app.request("/v1/repos/entrius/allways-ui/live-gate-thresholds", { headers: apiHeaders(shadowOnlyEnv) }, shadowOnlyEnv);
+    expect(shadowed.status).toBe(200);
+    await expect(shadowed.json()).resolves.toEqual({
+      repoFullName: "entrius/allways-ui",
+      confidence_floor: 0.66,
+      scope_cap_files: 3,
+      scope_cap_lines: 90,
+    });
+
+    const mcpAllowed = await app.request("/v1/repos/entrius/allways-ui/live-gate-thresholds", { headers: mcpHeaders(env) }, env);
+    expect(mcpAllowed.status).toBe(200);
+
+    const forbiddenEnv = createTestEnv({ MCP_READ_REPO_ALLOWLIST: "" });
+    await writeLiveOverride(forbiddenEnv as unknown as StorageEnv, "entrius/allways-ui", { confidenceFloor: 0.9 });
+    const forbidden = await app.request("/v1/repos/entrius/allways-ui/live-gate-thresholds", { headers: mcpHeaders(forbiddenEnv) }, forbiddenEnv);
+    expect(forbidden.status).toBe(403);
+    await expect(forbidden.json()).resolves.toMatchObject({ error: "forbidden_repo" });
+
+    const unauth = await app.request("/v1/repos/entrius/allways-ui/live-gate-thresholds", {}, env);
+    expect(unauth.status).toBe(401);
+  });
 });
 
 async function signWebhook(body: string, secret: string | undefined): Promise<string> {
diff --git a/test/unit/auto-apply.test.ts b/test/unit/auto-apply.test.ts
index 20b6cf64b9..131995c5eb 100644
--- a/test/unit/auto-apply.test.ts
+++ b/test/unit/auto-apply.test.ts
@@ -18,12 +18,52 @@ import {
   SHADOW_PROMOTION_MIN_DECIDED,
   type StorageEnv,
   type StorageLike,
+  toLiveGateThresholdFields,
+  authoritativeGateOverride,
   type TunableOverride,
   writeLiveOverride,
   writeShadowOverride,
 } from "../../src/review/auto-apply";
 import type { TuningRec } from "../../src/review/auto-tune";
 
+describe("live gate threshold projection (#6486)", () => {
+  it("prefers live over shadow and projects snake_case fields only", () => {
+    const live = { confidenceFloor: 0.9, scopeCap: { files: 10, lines: 300 } };
+    const shadow = { override: { confidenceFloor: 0.5 }, validatedUntil: "2099-01-01T00:00:00.000Z" };
+    expect(authoritativeGateOverride(live, shadow)).toEqual(live);
+    expect(toLiveGateThresholdFields(live)).toEqual({
+      confidence_floor: 0.9,
+      scope_cap_files: 10,
+      scope_cap_lines: 300,
+    });
+  });
+
+  it("falls through to shadow when live is absent, and returns null when neither is active", () => {
+    const shadow = { override: { confidenceFloor: 0.7 }, validatedUntil: null };
+    expect(toLiveGateThresholdFields(authoritativeGateOverride(null, shadow))).toEqual({
+      confidence_floor: 0.7,
+      scope_cap_files: null,
+      scope_cap_lines: null,
+    });
+    expect(toLiveGateThresholdFields(authoritativeGateOverride(null, null))).toBeNull();
+    expect(toLiveGateThresholdFields(null)).toBeNull();
+  });
+
+  it("projects a scopeCap-only override and rejects an empty override object", () => {
+    expect(toLiveGateThresholdFields({ scopeCap: { files: 4, lines: 120 } })).toEqual({
+      confidence_floor: null,
+      scope_cap_files: 4,
+      scope_cap_lines: 120,
+    });
+    expect(toLiveGateThresholdFields({ confidenceFloor: 0.81 })).toEqual({
+      confidence_floor: 0.81,
+      scope_cap_files: null,
+      scope_cap_lines: null,
+    });
+    expect(toLiveGateThresholdFields({})).toBeNull();
+  });
+});
+
 describe("rowToOverride (#273 — D1 row → validated override)", () => {
   it("maps a full row", () => {
     expect(rowToOverride({ confidence_floor: 0.95, scope_cap_files: 5, scope_cap_lines: 200, clear_at: null })).toEqual({