diff --git a/frontend/src/app/api/health/route.ts b/frontend/src/app/api/health/route.ts
index e8cab627..fa8da833 100644
--- a/frontend/src/app/api/health/route.ts
+++ b/frontend/src/app/api/health/route.ts
@@ -1,5 +1,7 @@
 import { NextResponse } from "next/server";
 
+import { getTruthSourceRuntimeIdentity } from "@/lib/truth-source-runtime-identity";
+
 type Check = {
   status: "ok" | "degraded" | "blocked";
   message?: string;
@@ -58,12 +60,17 @@ function aggregate(checks: Record<string, Check>) {
 }
 
 export async function GET() {
+  const truthSourceIdentity = getTruthSourceRuntimeIdentity();
   const checks = {
     web: { status: "ok" } satisfies Check,
     supabasePublicConfig: envCheck(["NEXT_PUBLIC_SUPABASE_URL", "NEXT_PUBLIC_SUPABASE_ANON_KEY"]),
     supabaseServiceRole: envCheck(["SUPABASE_SERVICE_ROLE_KEY"]),
     modelProvider: anyEnvCheck(["LLM_MODELS_JSON", "OPENAI_API_KEY", "LLM_API_KEY", "DEEPSEEK_API_KEY"]),
     jyotishApi: await jyotishApiCheck(),
+    researchTruthSource: {
+      status: truthSourceIdentity.status,
+      message: truthSourceIdentity.mountStatus === "mounted" ? undefined : truthSourceIdentity.mountStatus,
+    } satisfies Check,
   };
   const status = aggregate(checks);
   return NextResponse.json(
@@ -73,6 +80,7 @@ export async function GET() {
       deployment: {
         gitCommit,
       },
+      truthSource: truthSourceIdentity,
       checks,
     },
     { status: status === "ok" ? 200 : 503 },
diff --git a/frontend/src/lib/truth-source-runtime-identity.ts b/frontend/src/lib/truth-source-runtime-identity.ts
new file mode 100644
index 00000000..3297b130
--- /dev/null
+++ b/frontend/src/lib/truth-source-runtime-identity.ts
@@ -0,0 +1,82 @@
+import { existsSync, readFileSync } from "node:fs";
+import { join } from "node:path";
+
+type OracleSummary = {
+  ready: string[];
+  partial: string[];
+  blocked: string[];
+};
+
+export type TruthSourceRuntimeIdentity = {
+  status: "ok" | "blocked";
+  path: string;
+  mountStatus: "mounted" | "not_mounted";
+  commit: string;
+  skillVersion: string;
+  evidencePacketCount: number | null;
+  oracleSummary: OracleSummary;
+  claimGateStatus: "ready" | "partial_or_blocked_present" | "not_mounted";
+};
+
+export const DEFAULT_RESEARCH_TRUTH_SOURCE_PATH = "/Users/wuyongnaren/Documents/印度占星";
+
+function readJson(path: string): unknown {
+  return JSON.parse(readFileSync(path, "utf8"));
+}
+
+function readEvidencePacketCount(researchPath: string): number | null {
+  const indexPath = join(researchPath, "references/oracle/evidence_packet_index_2026_07_19.json");
+  if (!existsSync(indexPath)) return null;
+  const data = readJson(indexPath) as { summary?: { packet_count?: unknown } };
+  return typeof data.summary?.packet_count === "number" ? data.summary.packet_count : null;
+}
+
+function readSkillVersion(researchPath: string): string {
+  const skillPath = join(researchPath, "SKILL.md");
+  if (!existsSync(skillPath)) return "unknown";
+  const source = readFileSync(skillPath, "utf8");
+  const version = source.match(/(?:version|Version)[:：]\s*([^\n]+)/);
+  return version?.[1]?.trim() || "present_unversioned";
+}
+
+function readCommit(researchPath: string): string {
+  const headPath = join(researchPath, ".git/HEAD");
+  if (!existsSync(headPath)) return "unknown";
+  const head = readFileSync(headPath, "utf8").trim();
+  if (!head.startsWith("ref: ")) return head.slice(0, 40);
+  const refPath = join(researchPath, ".git", head.slice(5));
+  if (!existsSync(refPath)) return "unknown";
+  return readFileSync(refPath, "utf8").trim().slice(0, 40);
+}
+
+export function getTruthSourceRuntimeIdentity(
+  researchPath = process.env.JYOTISH_RESEARCH_TRUTH_SOURCE_PATH ?? DEFAULT_RESEARCH_TRUTH_SOURCE_PATH,
+): TruthSourceRuntimeIdentity {
+  if (!existsSync(researchPath)) {
+    return {
+      status: "blocked",
+      path: researchPath,
+      mountStatus: "not_mounted",
+      commit: "unknown",
+      skillVersion: "unknown",
+      evidencePacketCount: null,
+      oracleSummary: { ready: [], partial: [], blocked: ["research_truth_source_not_mounted"] },
+      claimGateStatus: "not_mounted",
+    };
+  }
+
+  const evidencePacketCount = readEvidencePacketCount(researchPath);
+  const blocked = evidencePacketCount === null ? ["evidence_packet_index_missing"] : [];
+  const partial = ["commercial_runtime_identity_only"];
+
+  return {
+    status: blocked.length ? "blocked" : "ok",
+    path: researchPath,
+    mountStatus: "mounted",
+    commit: readCommit(researchPath),
+    skillVersion: readSkillVersion(researchPath),
+    evidencePacketCount,
+    oracleSummary: { ready: [], partial, blocked },
+    claimGateStatus: blocked.length ? "partial_or_blocked_present" : "partial_or_blocked_present",
+  };
+}
diff --git a/frontend/tests/truth-source-runtime-identity.test.ts b/frontend/tests/truth-source-runtime-identity.test.ts
new file mode 100644
index 00000000..d02a8933
--- /dev/null
+++ b/frontend/tests/truth-source-runtime-identity.test.ts
@@ -0,0 +1,28 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import test from "node:test";
+
+const identitySource = readFileSync(
+  new URL("../src/lib/truth-source-runtime-identity.ts", import.meta.url),
+  "utf8",
+);
+const healthSource = readFileSync(
+  new URL("../src/app/api/health/route.ts", import.meta.url),
+  "utf8",
+);
+
+test("truth source identity records research source without pretending local mount is always present", () => {
+  assert.match(identitySource, /DEFAULT_RESEARCH_TRUTH_SOURCE_PATH/);
+  assert.ok(identitySource.includes("/Users/wuyongnaren/Documents/印度占星"));
+  assert.match(identitySource, /not_mounted/);
+  assert.match(identitySource, /claimGateStatus/);
+  assert.match(identitySource, /evidencePacketCount/);
+  assert.match(identitySource, /oracleSummary/);
+});
+
+test("health endpoint exposes truth source identity beside deployment identity", () => {
+  assert.match(healthSource, /getTruthSourceRuntimeIdentity/);
+  assert.match(healthSource, /truthSource/);
+  assert.match(healthSource, /truthSource:\s*truthSourceIdentity/);
+  assert.match(healthSource, /researchTruthSource/);
+});