---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-08-11T20:58:26Z
git_ref: 06d5ea5d
diff_cmd: git diff HEAD~1..HEAD
---

The user reported that certain IB order entries might have broken and
provided a live failure for a first NVDA sell order. EMS delivered the
request to `brokerd.ib`, but lazy `get_mkt_info('nvda.nasdaq')` contract
qualification failed in `MethodProxy._run_method()` with:

```text
tractor.trionics._broadcast.Lagged:
Task `piker.brokers.ib.broker.handle_order_requests` overrun and
dropped `0` values
```

The user suspected a cancelled symbol-search task might have left stale
asyncio state. Cancellation can leave an orphaned method response, but the
observed failure was stale Trio broadcast state. `open_client_proxy()`
broadcast a one-slot `LinkedTaskChannel` to an always-running IB status relay
and an idle method receiver. Status traffic advanced only the relay, so the
first method call for an uncached symbol entered an already-lagged receiver.
Orders for eagerly cached contracts bypassed this path.

The immediately preceding sparse-history commit did not modify IB order,
symbol, or proxy code; it exposed no direct dependency on this failure.

> `git diff HEAD~1..HEAD -- piker/brokers/ib/api.py`

Generated a sole-reader message demultiplexer for each IB client proxy.
`relay_client_proxy_messages()` owns every asyncio-to-Trio receive, handles
status/error traffic, and dispatches `mid`-tagged responses into per-call
`MethodProxy` wait slots. Cancelled calls remove their pending slot, causing
late responses to be logged and dropped without skewing later calls. Clean
channel EOF is accepted during normal proxy teardown.

Follow-up review restored the masked reconnect TODO and per-message case
rationale, documented the one-reader/many-writer task hierarchy and separate
per-proxy channels, and added a warning with request method metadata when the
bounded unresolved-request diagnostic table evicts its oldest entry.

> `git diff HEAD~1..HEAD -- tests/test_ib_method_proxy.py`

Generated deterministic regressions for idle status traffic before first
qualification, two concurrent calls with reverse-order responses, cancelled
calls with late responses followed by a successful call, and graceful
channel EOF. Every synchronization wait is timeout-bounded.

> `git diff HEAD~1..HEAD -- .claude/skills/run-tests/test-harness-reference.md`

Registered the deterministic IB method-proxy target and source mapping.

Verification output:

```text
........................                                                 [100%]
25 passed, 4 warnings in 3.44s
```

The warnings are existing Tractor/Trio deprecations from the EMS test.
Adversarial review drove a clean-EOF guard and bounded polling. Final review
found no actionable issues. Live IB order validation remains pending and
requires restarting `brokerd.ib`.