diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66177e9..73140d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,22 @@
 
 ### Fixed
 
+- **Telemetry: `call_completed` is no longer lost when the process exits right
+  after `disconnect()`.** Found live in an E2E call test: `call_started`
+  reached the collector but `call_completed` — the one event carrying
+  duration/cost/latency/outcome — never did, for every short-lived script
+  ("place call, wait, exit", the main outbound use case). `disconnect()` used
+  a fire-and-forget flush; the loop closed right after and cancelled the POST
+  mid-air, and Python's 0.25 s atexit fallback was too short for a cold TLS
+  handshake. Both SDKs now `await telemetry.drain()` in `disconnect()` — a
+  new bounded flush-and-wait that keeps the client reusable (a subsequent
+  `serve()` still emits) — and the Python atexit timeout is bumped to 1 s as
+  a second line of defense for scripts that never call `disconnect()`.
+  `libraries/python/getpatter/telemetry/client.py`,
+  `libraries/python/getpatter/client.py`,
+  `libraries/typescript/src/telemetry/client.ts`,
+  `libraries/typescript/src/client.ts`.
+
 - **Telemetry: `hermes` / `openclaw` CLI usage is no longer invisible (schema
   v6).** The `cli_command` enum was closed over
   `dashboard/eval/telemetry/none/other`, so the wizard commands — the main
diff --git a/libraries/python/getpatter/client.py b/libraries/python/getpatter/client.py
index bba13d4..47a8580 100644
--- a/libraries/python/getpatter/client.py
+++ b/libraries/python/getpatter/client.py
@@ -2582,10 +2582,14 @@ async def disconnect(self) -> None:
         teardown, and stale entries leak across ``serve`` /
         ``disconnect`` cycles. See FIX #93.
         """
-        # Ship any telemetry buffered at construction/agent() before teardown.
-        # flush_pending is cheap and keeps the instance reusable (no close), so a
-        # subsequent serve() still emits.
-        self._telemetry.flush_pending()
+        # Ship buffered telemetry and WAIT for delivery (bounded) before
+        # teardown. A fire-and-forget flush here lost the final events of
+        # short-lived scripts: the process exited right after disconnect(),
+        # the loop closed cancelling the flush task mid-POST, and
+        # call_completed (duration/cost/latency) never reached the wire.
+        # drain() keeps the instance reusable (no close) — a subsequent
+        # serve() still emits.
+        await self._telemetry.drain()
 
         # Cancel and drain any in-flight prewarm work BEFORE tearing the
         # server down so the synth tasks see a clean cancellation point
diff --git a/libraries/python/getpatter/telemetry/client.py b/libraries/python/getpatter/telemetry/client.py
index f1d9d98..9c85ea4 100644
--- a/libraries/python/getpatter/telemetry/client.py
+++ b/libraries/python/getpatter/telemetry/client.py
@@ -41,7 +41,11 @@
 
 _TIMEOUT_S = 3.0
 _FLUSH_TIMEOUT_S = 2.0
-_ATEXIT_TIMEOUT_S = 0.25  # keep process-exit blocking minimal for short-lived runs
+# Bounded process-exit flush. 0.25 s was routinely too short for a cold TLS
+# POST (the final batch of a short-lived script was lost); 1 s delivers it
+# while keeping exit blocking small. Scripts that call disconnect() don't rely
+# on this — disconnect() drains with the loop still alive.
+_ATEXIT_TIMEOUT_S = 1.0
 _BUFFER_MAX = 256
 # The relay rejects batches larger than 64 events per request — a full buffer
 # must ship as multiple POSTs or events 65..256 silently vanish server-side.
@@ -184,6 +188,26 @@ def flush_pending(self) -> None:
         except Exception:
             logger.debug("telemetry flush_pending failed", exc_info=True)
 
+    async def drain(self, timeout: float = _FLUSH_TIMEOUT_S) -> None:
+        """Flush buffered events and wait (bounded) for delivery.
+
+        Unlike :meth:`aclose` the client stays usable afterwards — for teardown
+        paths that may serve again (``Patter.disconnect()``). Without the wait,
+        a process exiting right after ``disconnect()`` closes the event loop and
+        cancels the fire-and-forget flush task mid-POST — the final events of a
+        short-lived script (typically ``call_completed``, the one carrying
+        duration/cost/latency) were routinely lost.
+        """
+        if not self._enabled or self._debug or self._closed:
+            return
+        try:
+            if self._flush_task is not None and not self._flush_task.done():
+                await asyncio.wait_for(self._flush_task, timeout=timeout)
+            if self._buffer:
+                await asyncio.wait_for(self._flush(), timeout=timeout)
+        except Exception:
+            logger.debug("telemetry drain failed", exc_info=True)
+
     async def aclose(self) -> None:
         """Flush remaining events and release the HTTP client (graceful shutdown)."""
         if self._closed:
diff --git a/libraries/python/tests/test_telemetry.py b/libraries/python/tests/test_telemetry.py
index 045e612..00990db 100644
--- a/libraries/python/tests/test_telemetry.py
+++ b/libraries/python/tests/test_telemetry.py
@@ -228,6 +228,26 @@ async def test_aclose_awaits_in_flight_flush_started_by_record(enabled, collecto
     assert [e["event"] for e in collector.events] == ["cli_command"]
 
 
+async def test_drain_delivers_final_events_and_keeps_client_usable(enabled, collector):
+    """``Patter.disconnect()`` drains via ``drain()``: the final events of a
+    short-lived script (``call_completed`` carrying duration/cost/latency) must
+    be DELIVERED before the loop closes — a fire-and-forget flush was cancelled
+    at loop teardown and the bounded atexit fallback routinely lost them
+    (observed live: call_started reached Axiom, call_completed never did).
+    Unlike ``aclose``, the client must stay usable for a subsequent serve().
+    """
+    client = TelemetryClient(sdk_version="0.6.7", endpoint=collector.url)
+    client.record("call_completed", outcome="completed", carrier="twilio")
+    await client.drain()
+    assert [e["event"] for e in collector.events] == ["call_completed"]
+
+    # Still usable after drain (disconnect() must not kill a reusable instance).
+    client.record("cli_command", cli_command="dashboard")
+    await client.drain()
+    assert [e["event"] for e in collector.events] == ["call_completed", "cli_command"]
+    await client.aclose()
+
+
 class _GatedCollector(_Collector):
     """A real collector that holds its FIRST response until released.
 
@@ -950,7 +970,7 @@ def test_schema_version_is_6():
     assert build_event("first_run", sdk_version="0.6.5")["schema_version"] == 6
 
 
-def test_build_event_v5_new_events_and_dims():
+def test_build_event_v6_new_events_and_dims():
     cli = build_event(
         "cli_command", sdk_version="0.6.5", dimensions={"cli_command": "dashboard"}
     )
diff --git a/libraries/typescript/src/client.ts b/libraries/typescript/src/client.ts
index 97a3bc2..dac2f96 100644
--- a/libraries/typescript/src/client.ts
+++ b/libraries/typescript/src/client.ts
@@ -1984,9 +1984,11 @@ export class Patter {
    * entries leak across ``serve`` / ``disconnect`` cycles. See FIX #93.
    */
   async disconnect(): Promise<void> {
-    // Ship any telemetry buffered at construction/agent() before teardown.
-    // flushPending is cheap and keeps the instance reusable (no close).
-    this.telemetry.flushPending();
+    // Ship buffered telemetry and WAIT for delivery before teardown —
+    // mirrors Python: a fire-and-forget flush can lose the final events
+    // (call_completed with duration/cost/latency) when the process exits
+    // right after disconnect(). drain() keeps the instance reusable.
+    await this.telemetry.drain();
 
     // Clear pending TTL eviction timers and drain in-flight prewarm
     // synth tasks BEFORE tearing the server down so the synth tasks
diff --git a/libraries/typescript/src/telemetry/client.ts b/libraries/typescript/src/telemetry/client.ts
index 0e81dce..2abe6a4 100644
--- a/libraries/typescript/src/telemetry/client.ts
+++ b/libraries/typescript/src/telemetry/client.ts
@@ -153,6 +153,22 @@ export class TelemetryClient {
     }
   }
 
+  /**
+   * Flush buffered events and wait for delivery. Unlike `close()` the client
+   * stays usable afterwards — for teardown paths that may serve again
+   * (`Patter.disconnect()`). Bounded by the flush's own per-POST abort timer.
+   * Mirrors Python's `drain()`.
+   */
+  async drain(): Promise<void> {
+    if (!this.enabledFlag || this.debug || this.closed) return;
+    try {
+      if (this.inflight) await this.inflight;
+      if (this.buffer.length > 0) await this.flush();
+    } catch (err) {
+      getLogger().debug('telemetry drain failed', err);
+    }
+  }
+
   /** Flush remaining events (graceful shutdown). Never throws. */
   async close(): Promise<void> {
     if (this.closed) return;
diff --git a/libraries/typescript/tests/telemetry.test.ts b/libraries/typescript/tests/telemetry.test.ts
index a04e5a1..d6b3420 100644
--- a/libraries/typescript/tests/telemetry.test.ts
+++ b/libraries/typescript/tests/telemetry.test.ts
@@ -296,6 +296,23 @@ describe('[integration] telemetry — enabled path', () => {
     expect(collector.events.map((e) => e.event)).toEqual(['cli_command']);
   });
 
+  it('drain() delivers the final events and keeps the client usable (disconnect path)', async () => {
+    enableTelemetryEnv();
+    const client = new TelemetryClient({ sdkVersion: '0.6.7', endpoint: collector.url });
+    client.record('call_completed', { outcome: 'completed', carrier: 'twilio' });
+    // Patter.disconnect() awaits drain(): the final events of a short-lived
+    // script (call_completed with duration/cost/latency) must be DELIVERED
+    // before teardown, not left to a fire-and-forget flush racing process exit.
+    await client.drain();
+    expect(collector.events.map((e) => e.event)).toEqual(['call_completed']);
+
+    // Unlike close(), the client stays usable for a subsequent serve().
+    client.record('cli_command', { cli_command: 'dashboard' });
+    await client.drain();
+    expect(collector.events.map((e) => e.event)).toEqual(['call_completed', 'cli_command']);
+    await client.close();
+  });
+
   it('an event recorded during an in-flight flush is chained, not stranded', async () => {
     // Regression: record() saw `inflight` and skipped scheduling, so an event
     // recorded while a flush POST was in flight sat in the buffer with no