diff --git a/docs/specs/2026-07-31-preserve-frozen-session-workspace-binding.md b/docs/specs/2026-07-31-preserve-frozen-session-workspace-binding.md
new file mode 100644
index 0000000..598b175
--- /dev/null
+++ b/docs/specs/2026-07-31-preserve-frozen-session-workspace-binding.md
@@ -0,0 +1,59 @@
+# Preserve frozen Session workspace binding
+
+## Traceability
+
+- Spec ID: preserve-frozen-session-workspace-binding
+- Status: Implemented
+
+## Intent
+
+Keep the workspace qualification metadata of eligible Sessions intact when an
+evidence bundle freezes its shared Session population. This prevents a Session
+that was already qualified for the requested workspace from being discarded
+when the Session evidence and lead lanes consume the frozen population.
+
+## Acceptance Scenarios
+
+- AC-1: Freezing a Session with non-enumerable workspace CWD candidates
+  preserves those candidates on the frozen Session without making them part of
+  the public enumerable or serialized contract.
+- AC-2: A Codex evidence bundle whose frozen population contains one eligible
+  workspace-qualified Session reports one eligible and selected Session in the
+  Session facts lane instead of failing with
+  `SESSION_POPULATION_BINDING_MISMATCH`.
+
+## Non-goals
+
+- Changing Session discovery, active-Session omission, time-window filtering,
+  workspace qualification policy, or population fingerprints.
+- Making workspace CWD candidates enumerable or exposing them in report output.
+- Changing renderer, finding, scoring, or report schemas.
+
+## Plan and Tasks
+
+1. Preserve the private workspace CWD candidates while cloning each Session in
+   `freezeSessionPopulation`.
+2. Add a focused regression test proving the candidates survive freezing and
+   remain non-enumerable.
+3. Run the Session population tests, evidence-bundle tests, full package tests,
+   and a real Codex evidence-bundle collection against the reproducing
+   workspace.
+
+## Test and Review Evidence
+
+- AC-1: `node --test test/session-population.test.mjs`
+- AC-2: `node --test test/better-harness-evidence-bundle.test.mjs`
+- Regression gate: `npm test`
+- Real-path verification: run `harness evidence-bundle` for Codex against the
+  reproducing workspace and require `status: complete`, an available Session
+  evidence lane, and a bound Session population.
+- Risk review: confirm workspace CWD candidates remain absent from
+  `Object.keys`, object spread, and `JSON.stringify` output.
+
+Observed evidence:
+
+- Focused Session population, task-loop source, and evidence-bundle tests:
+  55 passed, 0 failed.
+- Full package suite: 1019 passed, 0 failed.
+- Real Codex evidence bundle: `complete`; Session and lead lanes `available`;
+  population binding `bound`; eligible and analyzed counts `1/1`.
diff --git a/scripts/harness-analysis/task-loop-source.mjs b/scripts/harness-analysis/task-loop-source.mjs
index 867d084..b3bde1f 100644
--- a/scripts/harness-analysis/task-loop-source.mjs
+++ b/scripts/harness-analysis/task-loop-source.mjs
@@ -21,6 +21,7 @@ import { projectCheckupReportEvidence } from "../coding-agent-practices/checkup/
 import { buildTaskEpisodes, stableFingerprint } from "../session-analysis/episode-contract.mjs";
 import { buildObservationManifest } from "../session-analysis/observation-manifest.mjs";
 import { sanitizePrivateReviewText } from "../session-analysis/privacy-safe-text.mjs";
+import { cloneSessionWithWorkspaceCwds } from "../session-analysis/provider-runner.mjs";
 import { sessionAnalysisRef } from "../session-analysis/session-ref.mjs";
 import {
   bindSessionSelection,
@@ -1102,7 +1103,9 @@ export async function createTaskLoopSourceFromSessions(options = {}) {
     ? sessionPopulationDiscovery(population)
     : await analyzer.analyze({ ...analyzerOptions, command: "sources" });
   const inventorySource = population?.sessions ?? discovery.sessions;
-  const sessionInventory = Object.freeze(inventorySource.map((session) => Object.freeze(structuredClone(session))));
+  const sessionInventory = Object.freeze(
+    inventorySource.map((session) => Object.freeze(cloneSessionWithWorkspaceCwds(session))),
+  );
   if (selectionProfile) {
     assertSessionSelectionBinding(selectionProfile, selectionPlan, { eligibleCount: sessionInventory.length });
   }
diff --git a/scripts/session-analysis/provider-runner.mjs b/scripts/session-analysis/provider-runner.mjs
index f01bdb9..4e306e4 100644
--- a/scripts/session-analysis/provider-runner.mjs
+++ b/scripts/session-analysis/provider-runner.mjs
@@ -83,6 +83,11 @@ export function sessionWorkspaceCwds(session) {
   return typeof explicit === "string" && explicit.length > 0 ? [explicit] : [];
 }
 
+export function cloneSessionWithWorkspaceCwds(session) {
+  const clonedSession = structuredClone(session);
+  return bindSessionWorkspaceCwds(clonedSession, sessionWorkspaceCwds(session));
+}
+
 export function sessionWorkspaceCwd(session, workspaceScope) {
   if (!workspaceScope) return sessionWorkspaceCwds(session)[0] ?? null;
   if (session?.workspaceMatch === WORKSPACE_SESSION_MATCH.DIRECT_CWD) {
diff --git a/scripts/session-analysis/session-population.mjs b/scripts/session-analysis/session-population.mjs
index 3878cb4..b9188a1 100644
--- a/scripts/session-analysis/session-population.mjs
+++ b/scripts/session-analysis/session-population.mjs
@@ -3,6 +3,11 @@ import {
   createFactsRunContext,
   prepareFactsSessionInventory,
 } from "./session-core-facts.mjs";
+import {
+  bindSessionWorkspaceCwds,
+  cloneSessionWithWorkspaceCwds,
+  sessionWorkspaceCwds,
+} from "./provider-runner.mjs";
 
 export const SESSION_POPULATION_BINDING_SCHEMA_VERSION = 1;
 export const SESSION_SELECTION_BINDING_SCHEMA_VERSION = 1;
@@ -41,6 +46,14 @@ function bindingError(code, message) {
   return Object.assign(new Error(message), { code });
 }
 
+function freezeSession(session, inheritedWorkspaceCwds = []) {
+  const frozenCandidate = cloneSessionWithWorkspaceCwds(session);
+  if (sessionWorkspaceCwds(frozenCandidate).length === 0) {
+    bindSessionWorkspaceCwds(frozenCandidate, inheritedWorkspaceCwds);
+  }
+  return Object.freeze(frozenCandidate);
+}
+
 export function freezeSessionPopulation({
   scope = {},
   sessions = [],
@@ -58,8 +71,16 @@ export function freezeSessionPopulation({
     ...(excludedSessionId ? { "exclude-session-id": excludedSessionId } : {}),
     _factsStartedAt: startedAt,
   }, platform, providerSessionId);
-  const prepared = prepareFactsSessionInventory(rows(sessions), factsContext);
-  const frozenSessions = Object.freeze(prepared.sessions.map((session) => Object.freeze(structuredClone(session))));
+  const sourceSessions = rows(sessions);
+  const workspaceCwdsBySessionId = new Map(sourceSessions.flatMap((session) => {
+    const sessionId = String(session?.sessionId ?? "").trim();
+    return sessionId ? [[sessionId, sessionWorkspaceCwds(session)]] : [];
+  }));
+  const prepared = prepareFactsSessionInventory(sourceSessions, factsContext);
+  const frozenSessions = Object.freeze(prepared.sessions.map((session) => {
+    const sessionId = String(session?.sessionId ?? "").trim();
+    return freezeSession(session, sessionId ? workspaceCwdsBySessionId.get(sessionId) : []);
+  }));
   const ids = sessionIds(frozenSessions);
   const population = {
     sessions: frozenSessions,
diff --git a/test/session-population.test.mjs b/test/session-population.test.mjs
index 1f30f78..b23094f 100644
--- a/test/session-population.test.mjs
+++ b/test/session-population.test.mjs
@@ -5,6 +5,10 @@ async function populationModule() {
   return import("../scripts/session-analysis/session-population.mjs");
 }
 
+async function workspaceModule() {
+  return import("../scripts/session-analysis/provider-runner.mjs");
+}
+
 test("frozen population binding omits exact active and Qoder home-only sessions", async () => {
   const { freezeSessionPopulation } = await populationModule();
   const population = freezeSessionPopulation({
@@ -33,6 +37,28 @@ test("frozen population binding omits exact active and Qoder home-only sessions"
   assert.doesNotMatch(JSON.stringify(population.binding), /active-private|home-private|eligible-private|\/private/u);
 });
 
+test("frozen population preserves private Session workspace CWD candidates", async () => {
+  const { freezeSessionPopulation } = await populationModule();
+  const { bindSessionWorkspaceCwds, sessionWorkspaceCwds } = await workspaceModule();
+  const session = bindSessionWorkspaceCwds(
+    { sessionId: "eligible" },
+    ["/workspace", "/workspace/member"],
+  );
+
+  const population = freezeSessionPopulation({
+    scope: { platform: "codex", workspace: "/workspace", until: "2026-07-30T00:00:00.000Z" },
+    sessions: [session],
+    suppliedUntil: true,
+  });
+  const [frozenSession] = population.sessions;
+
+  assert.deepEqual(sessionWorkspaceCwds(frozenSession), ["/workspace", "/workspace/member"]);
+  assert.deepEqual(Object.keys(frozenSession), ["sessionId"]);
+  assert.deepEqual({ ...frozenSession }, { sessionId: "eligible" });
+  assert.equal(JSON.stringify(frozenSession), "{\"sessionId\":\"eligible\"}");
+  assert.equal(Object.isFrozen(frozenSession), true);
+});
+
 test("selection binding rejects a session outside the frozen population", async () => {
   const { bindSessionSelection, freezeSessionPopulation } = await populationModule();
   const population = freezeSessionPopulation({
diff --git a/test/task-loop-source.test.mjs b/test/task-loop-source.test.mjs
index cb66352..2dfbcbc 100644
--- a/test/task-loop-source.test.mjs
+++ b/test/task-loop-source.test.mjs
@@ -6,6 +6,10 @@ import test from "node:test";
 
 import { buildCheckupScan } from "../scripts/coding-agent-practices/checkup/scan.mjs";
 import { freezeSessionPopulation } from "../scripts/session-analysis/session-population.mjs";
+import {
+  bindSessionWorkspaceCwds,
+  sessionWorkspaceCwds,
+} from "../scripts/session-analysis/provider-runner.mjs";
 import {
   buildHarnessReviewPacket,
   validateHarnessReviewPacket,
@@ -401,13 +405,14 @@ test("requested usage reuses one frozen population without rediscovery and emits
   const root = await mkdtemp(path.join(os.tmpdir(), "better-harness-frozen-usage-"));
   const workspace = path.join(root, "workspace");
   const calls = [];
-  const initialSessions = ["session-a", "session-b"].map((sessionId) => ({
-    sessionId,
-    firstSeen: "2026-07-17T08:00:00.000Z",
-    lastSeen: "2026-07-17T08:05:00.000Z",
-    sourceKinds: ["fixture"],
-    sourceRefs: [{ kind: "project-session", path: "/fixture/session.jsonl" }],
-  }));
+  const initialSessions = ["session-a", "session-b"].map((sessionId) =>
+    bindSessionWorkspaceCwds({
+      sessionId,
+      firstSeen: "2026-07-17T08:00:00.000Z",
+      lastSeen: "2026-07-17T08:05:00.000Z",
+      sourceKinds: ["fixture"],
+      sourceRefs: [{ kind: "project-session", path: "/fixture/session.jsonl" }],
+    }, [workspace]));
   const activity = {
     schemaVersion: 1,
     dateBasis: "UTC",
@@ -449,6 +454,7 @@ test("requested usage reuses one frozen population without rediscovery and emits
         until: options.until,
         piHome: options.piHome,
         inventory: options.sessionInventory?.map((session) => session.sessionId) ?? null,
+        workspaceCwds: options.sessionInventory?.map(sessionWorkspaceCwds) ?? null,
       });
       if (options.command === "sources") {
         return {
@@ -524,6 +530,10 @@ test("requested usage reuses one frozen population without rediscovery and emits
       ["session-a", "session-b"],
       ["session-a", "session-b"],
     ]);
+    assert.deepEqual(calls.filter((call) => call.command === "insights").map((call) => call.workspaceCwds), [
+      [[workspace], [workspace]],
+      [[workspace], [workspace]],
+    ]);
   } finally {
     await rm(root, { recursive: true, force: true });
   }