diff --git a/src/resources/extensions/sf/tests/upstream-bridge.test.mjs b/src/resources/extensions/sf/tests/upstream-bridge.test.mjs
new file mode 100644
index 000000000..c184cef4c
--- /dev/null
+++ b/src/resources/extensions/sf/tests/upstream-bridge.test.mjs
@@ -0,0 +1,214 @@
+/**
+ * upstream-bridge.test.mjs — closure-aware idempotency.
+ *
+ * Validates that bridgeUpstreamFeedback respects:
+ *   - currently-OPEN rollup kinds (existing behavior)
+ *   - rollup kinds CLOSED within the last 30 days (new behavior addressing
+ *     sf-mp4rp6xn-hpag5h: bridge re-filed every closed cluster on every
+ *     session_start because it only checked open state)
+ *   - allows re-file when the same kind was closed OUTSIDE the lookback
+ */
+import {
+	mkdirSync,
+	mkdtempSync,
+	rmSync,
+	writeFileSync,
+} from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, beforeEach, describe, expect, test } from "vitest";
+import { bridgeUpstreamFeedback } from "../upstream-bridge.js";
+import {
+	closeDatabase,
+	listSelfFeedbackEntries,
+	openDatabase,
+} from "../sf-db.js";
+import { markResolved, recordSelfFeedback } from "../self-feedback.js";
+
+const tmpDirs = [];
+const ORIGINAL_SF_HOME = process.env.SF_HOME;
+
+beforeEach(() => {
+	delete process.env.SF_HOME;
+});
+
+afterEach(() => {
+	closeDatabase();
+	if (ORIGINAL_SF_HOME === undefined) {
+		delete process.env.SF_HOME;
+	} else {
+		process.env.SF_HOME = ORIGINAL_SF_HOME;
+	}
+	while (tmpDirs.length > 0) {
+		const dir = tmpDirs.pop();
+		if (dir) rmSync(dir, { recursive: true, force: true });
+	}
+});
+
+function makeForgeProject() {
+	const dir = mkdtempSync(join(tmpdir(), "sf-bridge-"));
+	tmpDirs.push(dir);
+	mkdirSync(join(dir, ".sf"), { recursive: true });
+	writeFileSync(
+		join(dir, "package.json"),
+		JSON.stringify({ name: "singularity-forge" }),
+	);
+	openDatabase(join(dir, ".sf", "sf.db"));
+	return dir;
+}
+
+function makeSfHome(upstreamEntries) {
+	const dir = mkdtempSync(join(tmpdir(), "sf-home-"));
+	tmpDirs.push(dir);
+	mkdirSync(join(dir, "agent"), { recursive: true });
+	const path = join(dir, "agent", "upstream-feedback.jsonl");
+	writeFileSync(
+		path,
+		upstreamEntries.map((e) => JSON.stringify(e)).join("\n") + "\n",
+	);
+	process.env.SF_HOME = dir;
+	return dir;
+}
+
+function makeUpstreamEntry(overrides = {}) {
+	return {
+		schemaVersion: 1,
+		id: `sf-upstream-${Math.random().toString(36).slice(2, 8)}`,
+		ts: new Date().toISOString(),
+		kind: "runaway-guard-hard-pause",
+		severity: "medium",
+		blocking: false,
+		summary: "synthetic upstream observation",
+		evidence: "tmpdir test",
+		repoIdentity: "external",
+		sfVersion: "test",
+		basePath: `/some/external/repo-${Math.random().toString(36).slice(2, 6)}`,
+		...overrides,
+	};
+}
+
+describe("bridgeUpstreamFeedback", () => {
+	test("files a new rollup when threshold met and no prior matching kind", () => {
+		const project = makeForgeProject();
+		// 3 entries of same kind, 2 distinct repos (meets THRESHOLD_COUNT=3, THRESHOLD_REPOS=2)
+		makeSfHome([
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/b" }),
+		]);
+
+		const filed = bridgeUpstreamFeedback(project);
+		expect(filed).toBe(1);
+		const entries = listSelfFeedbackEntries();
+		const rollup = entries.find((e) =>
+			e.kind?.startsWith("upstream-rollup:"),
+		);
+		expect(rollup).toBeTruthy();
+		expect(rollup.kind).toBe("upstream-rollup:runaway-guard-hard-pause");
+	});
+
+	test("skips when an OPEN rollup of the same kind already exists", () => {
+		const project = makeForgeProject();
+		makeSfHome([
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/b" }),
+		]);
+
+		expect(bridgeUpstreamFeedback(project)).toBe(1);
+		expect(bridgeUpstreamFeedback(project)).toBe(0);
+	});
+
+	test("skips when a same-kind rollup was RESOLVED within the lookback window (sf-mp4rp6xn-hpag5h)", async () => {
+		const project = makeForgeProject();
+		makeSfHome([
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/b" }),
+		]);
+
+		// File once, then close with human-clear (today)
+		expect(bridgeUpstreamFeedback(project)).toBe(1);
+		const filed = listSelfFeedbackEntries().find((e) =>
+			e.kind?.startsWith("upstream-rollup:"),
+		);
+		const ok = markResolved(
+			filed.id,
+			{
+				reason: "out of scope for inline-fix",
+				evidence: { kind: "human-clear" },
+			},
+			project,
+		);
+		expect(ok).toBe(true);
+
+		// Re-running the bridge MUST NOT re-file. This is the regression guard.
+		const refiled = bridgeUpstreamFeedback(project);
+		expect(refiled).toBe(0);
+	});
+
+	test("allows re-file when same-kind rollup was resolved BEFORE lookback (>30d)", async () => {
+		const project = makeForgeProject();
+		makeSfHome([
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/b" }),
+		]);
+
+		expect(bridgeUpstreamFeedback(project)).toBe(1);
+		const filed = listSelfFeedbackEntries().find((e) =>
+			e.kind?.startsWith("upstream-rollup:"),
+		);
+		markResolved(
+			filed.id,
+			{ reason: "ancient close", evidence: { kind: "human-clear" } },
+			project,
+		);
+		// Back-date the resolution to 60 days ago via direct DB update
+		const oldTs = new Date(
+			Date.now() - 60 * 24 * 60 * 60 * 1000,
+		).toISOString();
+		const { _getAdapter } = await import("../sf-db/sf-db-core.js");
+		_getAdapter()
+			.prepare("UPDATE self_feedback SET resolved_at = :ts WHERE id = :id")
+			.run({ ":ts": oldTs, ":id": filed.id });
+
+		// Bridge should re-file because the closure is now stale (>30 days)
+		const refiled = bridgeUpstreamFeedback(project);
+		expect(refiled).toBe(1);
+	});
+
+	test("doesn't fire below threshold (2 entries, 2 repos < 3-count threshold)", () => {
+		const project = makeForgeProject();
+		makeSfHome([
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/b" }),
+		]);
+		expect(bridgeUpstreamFeedback(project)).toBe(0);
+	});
+
+	test("doesn't fire below repo-distinct threshold (3 entries, 1 repo)", () => {
+		const project = makeForgeProject();
+		makeSfHome([
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/a" }),
+		]);
+		expect(bridgeUpstreamFeedback(project)).toBe(0);
+	});
+
+	test("returns 0 when basePath isn't the forge repo", () => {
+		const dir = mkdtempSync(join(tmpdir(), "sf-non-forge-"));
+		tmpDirs.push(dir);
+		writeFileSync(
+			join(dir, "package.json"),
+			JSON.stringify({ name: "some-other-app" }),
+		);
+		makeSfHome([
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/a" }),
+			makeUpstreamEntry({ basePath: "/b" }),
+		]);
+		expect(bridgeUpstreamFeedback(dir)).toBe(0);
+	});
+});
diff --git a/src/resources/extensions/sf/upstream-bridge.js b/src/resources/extensions/sf/upstream-bridge.js
index ac234fcb6..41134716c 100644
--- a/src/resources/extensions/sf/upstream-bridge.js
+++ b/src/resources/extensions/sf/upstream-bridge.js
@@ -89,20 +89,36 @@ export function bridgeUpstreamFeedback(basePath = process.cwd()) {
 			list.push(e);
 			byKind.set(e.kind, list);
 		}
-		// Read existing forge-local entries once for idempotency checks
+		// Read existing forge-local entries once for idempotency checks. We
+		// exclude both currently-OPEN rollup kinds AND rollup kinds that an
+		// operator (or the triage worker) closed within the last LOOKBACK_DAYS
+		// window. Without the closed-recently check, the bridge re-files the
+		// same cluster on the next session_start every time someone closes it
+		// — observed in dogfood 2026-05-13 (sf-mp4rp6xn-hpag5h). The closure
+		// is treated as time-limited: after the window expires, a re-cluster
+		// CAN re-file (the original closure was made against then-current
+		// state; later state may legitimately surface the same kind again).
 		const existing = readAllSelfFeedback(basePath);
-		const openRollupKinds = new Set(
-			existing
-				.filter((e) => !e.resolvedAt && e.kind.startsWith("upstream-rollup:"))
-				.map((e) => e.kind),
-		);
+		const recentCutoff = Date.now() - THIRTY_DAYS_MS;
+		const suppressedRollupKinds = new Set();
+		for (const e of existing) {
+			if (!e.kind?.startsWith("upstream-rollup:")) continue;
+			if (!e.resolvedAt) {
+				suppressedRollupKinds.add(e.kind);
+				continue;
+			}
+			const resolvedMs = new Date(e.resolvedAt).getTime();
+			if (Number.isFinite(resolvedMs) && resolvedMs >= recentCutoff) {
+				suppressedRollupKinds.add(e.kind);
+			}
+		}
 		let filed = 0;
 		for (const [kind, entries] of byKind) {
 			if (entries.length < THRESHOLD_COUNT) continue;
 			const distinctRepos = new Set(entries.map((e) => e.basePath)).size;
 			if (distinctRepos < THRESHOLD_REPOS) continue;
 			const rollupKind = `upstream-rollup:${kind}`;
-			if (openRollupKinds.has(rollupKind)) continue;
+			if (suppressedRollupKinds.has(rollupKind)) continue;
 			// Derive severity, capped at medium
 			const severity = capSeverity(maxSeverity(entries));
 			// Build evidence block: up to 5 samples + full id list
@@ -129,7 +145,7 @@ export function bridgeUpstreamFeedback(basePath = process.cwd()) {
 			);
 			if (result) {
 				filed++;
-				openRollupKinds.add(rollupKind); // prevent double-filing in same run
+				suppressedRollupKinds.add(rollupKind); // prevent double-filing in same run
 			}
 		}
 		return filed;