diff --git a/src/mcp/cowork-ingest.ts b/src/mcp/cowork-ingest.ts
index f774bd12..9091283e 100644
--- a/src/mcp/cowork-ingest.ts
+++ b/src/mcp/cowork-ingest.ts
@@ -461,8 +461,11 @@ export async function ingestCoworkSessions(): Promise<{ ingested: number } | { s
 
     for (const path of transcripts) {
       let lines: string[];
+      let hasUnterminatedTail: boolean;
       try {
-        lines = readFileSync(path, "utf-8").split("\n").filter(Boolean);
+        const transcript = readFileSync(path, "utf-8");
+        lines = transcript.split("\n").filter(Boolean);
+        hasUnterminatedTail = !transcript.endsWith("\n");
       } catch {
         continue;
       }
@@ -479,6 +482,11 @@ export async function ingestCoworkSessions(): Promise<{ ingested: number } | { s
         try {
           parsed = JSON.parse(raw);
         } catch {
+          // The producer may still be appending this final record. Retrying
+          // it next tick preserves the watermark until it becomes parseable.
+          // Complete records without a final newline remain supported; only
+          // an unparseable, unterminated tail waits for more bytes.
+          if (hasUnterminatedTail && processed === lines.length - 1) break;
           processed += 1;
           continue;
         }
diff --git a/tests/claude-code/cowork-ingest-partial-record.test.ts b/tests/claude-code/cowork-ingest-partial-record.test.ts
new file mode 100644
index 00000000..ba2560dc
--- /dev/null
+++ b/tests/claude-code/cowork-ingest-partial-record.test.ts
@@ -0,0 +1,173 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import {
+  appendFileSync,
+  mkdirSync,
+  mkdtempSync,
+  readFileSync,
+  writeFileSync,
+} from "node:fs";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+
+const uploads: string[] = [];
+let networkAvailable = true;
+
+vi.mock("../../src/deeplake-api.js", () => ({
+  DeeplakeApi: class {
+    async query(sql: string): Promise<never[]> {
+      if (!networkAvailable) throw new Error("offline");
+      uploads.push(sql);
+      return [];
+    }
+    async ensureSessionsTable(): Promise<void> {}
+  },
+}));
+
+vi.mock("../../src/hooks/spawn-wiki-worker.js", () => ({
+  bundleDirFromImportMeta: () => "test-bundle",
+  spawnWikiWorker: vi.fn(),
+}));
+
+vi.mock("../../src/skillify/triggers.js", () => ({
+  forceSessionEndTrigger: vi.fn(),
+}));
+
+const SESSION_A = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa";
+const SESSION_B = "bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb";
+
+let home: string;
+let previousHome: string | undefined;
+
+function transcriptPath(sessionId: string): string {
+  const desktopDir = process.platform === "darwin"
+    ? join(home, "Library", "Application Support", "Claude")
+    : join(home, ".config", "Claude");
+  const dir = join(desktopDir, "local-agent-mode-sessions", "run", ".claude", "projects", "proj");
+  mkdirSync(dir, { recursive: true });
+  return join(dir, `${sessionId}.jsonl`);
+}
+
+function record(sessionId: string, content: string): string {
+  return JSON.stringify({
+    type: "user",
+    sessionId,
+    timestamp: "2026-09-22T00:00:00.000Z",
+    cwd: "/cowork",
+    message: { role: "user", content },
+  });
+}
+
+function queuePath(sessionId: string): string {
+  return join(home, ".deeplake", "queue-cowork", `${sessionId}.jsonl`);
+}
+
+function queuedMessages(sessionId: string): string[] {
+  return readFileSync(queuePath(sessionId), "utf8")
+    .trim()
+    .split("\n")
+    .map(line => (JSON.parse(line) as { message: string }).message)
+    .map(message => JSON.parse(message) as { content: string })
+    .map(message => message.content);
+}
+
+async function loadIngest() {
+  vi.resetModules();
+  return import("../../src/mcp/cowork-ingest.js");
+}
+
+beforeEach(() => {
+  previousHome = process.env.HOME;
+  home = mkdtempSync(join(tmpdir(), "hivemind-cowork-partial-"));
+  process.env.HOME = home;
+  mkdirSync(join(home, ".deeplake"), { recursive: true });
+  writeFileSync(
+    join(home, ".deeplake", "credentials.json"),
+    JSON.stringify({
+      token: "test-token",
+      orgId: "test-org",
+      orgName: "test-org",
+      userName: "test-user",
+      workspaceId: "test-workspace",
+      apiUrl: "http://127.0.0.1:1",
+    }),
+  );
+  uploads.length = 0;
+  networkAvailable = true;
+});
+
+afterEach(() => {
+  if (previousHome === undefined) delete process.env.HOME;
+  else process.env.HOME = previousHome;
+});
+
+describe("Cowork ingest partial transcript records", () => {
+  it("holds an unparseable final record, then ingests it after split writes", async () => {
+    const path = transcriptPath(SESSION_A);
+    const first = record(SESSION_A, "first");
+    const malformed = "{not-json}";
+    const partial = record(SESSION_A, "split record");
+    const splitAt = Buffer.from(partial, "utf8").indexOf(Buffer.from("split", "utf8"));
+    writeFileSync(path, `${first}\n\n${malformed}\n` + Buffer.from(partial, "utf8").subarray(0, splitAt));
+
+    const { ingestCoworkSessions } = await loadIngest();
+    await ingestCoworkSessions();
+
+    // The earlier good line was committed; the malformed newline-terminated
+    // line was skipped; the unterminated tail remains in the real queue state.
+    expect(uploads).toHaveLength(1);
+    expect(uploads[0]).toContain('"content":"first"');
+    const state = JSON.parse(readFileSync(join(home, ".deeplake", "cowork-ingest-state.json"), "utf8"));
+    expect(state.processedLines[path]).toBe(2);
+    expect(readFileSync(path, "utf8")).not.toContain("split record");
+
+    appendFileSync(path, Buffer.from(partial, "utf8").subarray(splitAt));
+    appendFileSync(path, "\r\n");
+    await ingestCoworkSessions();
+    await ingestCoworkSessions();
+
+    expect(uploads).toHaveLength(2);
+    expect(uploads.filter(sql => sql.includes('"content":"split record"'))).toHaveLength(1);
+    expect(uploads.filter(sql => sql.includes('"content":"first"'))).toHaveLength(1);
+  });
+
+  it("waits for split UTF-8 bytes and accepts the completed CRLF record", async () => {
+    const path = transcriptPath(SESSION_A);
+    const full = Buffer.from(record(SESSION_A, "emoji 💾 survives") + "\r\n", "utf8");
+    const emojiBytes = Buffer.from("💾", "utf8");
+    const splitAt = full.indexOf(emojiBytes) + 1;
+    writeFileSync(path, full.subarray(0, splitAt));
+
+    const { ingestCoworkSessions } = await loadIngest();
+    await ingestCoworkSessions();
+    expect(uploads).toHaveLength(0);
+
+    appendFileSync(path, full.subarray(splitAt));
+    await ingestCoworkSessions();
+    expect(uploads).toHaveLength(1);
+    expect(uploads[0]).toContain('"content":"emoji 💾 survives"');
+  });
+
+  it("keeps transcript watermarks independent and does not duplicate repeated polls", async () => {
+    const pathA = transcriptPath(SESSION_A);
+    const pathB = transcriptPath(SESSION_B);
+    const partial = record(SESSION_A, "A partial");
+    const splitAt = Buffer.byteLength(partial, "utf8") - 3;
+    writeFileSync(pathA, Buffer.from(partial, "utf8").subarray(0, splitAt));
+    writeFileSync(pathB, `${record(SESSION_B, "B complete")}\n`);
+
+    const { ingestCoworkSessions } = await loadIngest();
+    await ingestCoworkSessions();
+    await ingestCoworkSessions();
+    expect(uploads).toHaveLength(1);
+    expect(uploads[0]).toContain('"content":"B complete"');
+    expect(uploads[0]).not.toContain("A partial");
+
+    appendFileSync(pathA, Buffer.from(partial, "utf8").subarray(splitAt));
+    await ingestCoworkSessions();
+    await ingestCoworkSessions();
+
+    expect(uploads).toHaveLength(2);
+    expect(uploads.filter(sql => sql.includes('"content":"A partial"'))).toHaveLength(1);
+    expect(uploads.filter(sql => sql.includes('"content":"B complete"'))).toHaveLength(1);
+  });
+});