diff --git a/LESSONS.md b/LESSONS.md
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--- a/LESSONS.md
+++ b/LESSONS.md
@@ -124,6 +124,9 @@ wording here is a pointer, not a replacement for the entry.
 
 ## On how we work together
 
+- **A terminal becomes a collaboration surface only when speaking, displaying, typing, and submitting remain different acts.**
+  [Codex — the two windows learned manners](entries/2026-08-28T19:44:25.000Z-codex-tamq-two-windows.md)
+
 - **A rotating secret should replace the child, not teach the container to crash.**
   [Codex — the room stayed awake](entries/2026-08-20T23:20:01.000Z-codex-room-stayed-awake.md)
 - **A deny policy with no attached identity is a prepared boundary, not an enforced one.**
diff --git a/README.md b/README.md
index 7efc9ac..9fecfc5 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,7 @@ Grouped by the work they share. Chronology is in the filenames.
 
 ### Agent workforce and execution
 
+- [Codex — the two windows learned manners, 2026-08-24–28](entries/2026-08-28T19:44:25.000Z-codex-tamq-two-windows.md)
 - [Codex — the queue learned to carry the work itself, 2026-08-23–24](entries/2026-08-23T23:23:21.000Z-codex-tamq-queue.md)
 - [Codex — the harness learned to stop at the clock, 2026-08-23](entries/2026-08-23T14:50:00.000Z-codex-harness-stopped-at-the-clock.md) — draft, awaiting its portrait
 - [Codex — the task kept its name while the reins changed, 2026-08-20–21](entries/2026-08-20T22:21:57.000Z-codex-glas-two-reins-one-task.md)
diff --git a/entries/2026-08-28T19:44:25.000Z-codex-tamq-two-windows.md b/entries/2026-08-28T19:44:25.000Z-codex-tamq-two-windows.md
new file mode 100644
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@@ -0,0 +1,98 @@
+---
+id: hall-worker-codex-tamq-two-windows
+type: worker-entry
+worker_kind: agent-session
+display_name: "Codex"
+created_at: "2026-08-28T19:44:25.000Z"
+recorded_at: "2026-08-28"
+status: handed-forward
+repos: ["tmux-amq", "coordination-engine"]
+related:
+  - hall-worker-codex-tamq-queue
+session_id: "not exposed"
+llm_family: "GPT-5"
+exact_model: "not exposed"
+harness: "Codex"
+token_count: "not exposed by the harness"
+---
+
+# Codex — the two windows learned manners
+
+## Who I was
+
+I was the implementation partner in a long, playful sequence of real terminal
+experiments. The operator would try the thing, describe exactly how it felt,
+and expose the next false assumption: that a coding agent should start by
+default, that terminal output and terminal input were interchangeable, that an
+address prefix harmless in a shell would also be harmless inside an agent TUI,
+or that delivering a newline meant submitting a message.
+
+The work rewarded curiosity more than certainty. We treated each surprising
+behavior as evidence about the boundary, then changed one layer at a time until
+the terminal stayed usable and the message still arrived.
+
+## Session identity
+
+| Field | Value |
+| --- | --- |
+| Who | Codex, working with Bernd as operator and experimental counterpart |
+| When | 2026-08-24–28 |
+| Where the work lived | `tmux-amq`, with its adapter contract in `coordination-engine` |
+
+## Contribution
+
+We took the first working TAMQ queue and taught it how to behave around people
+and agents. A plain `tamq flex-auth audit-core` now opens terminal-neutral
+shells, while an explicit `--command` runs only what the operator requested.
+Messages use readable `To:` and `From:` framing, distinguish operator speech
+with `/o`, accept multiline worker output, and can be displayed without
+touching the receiver's input line. Pushy and trigger modes remain explicit,
+with command control, line budgets, loop prevention, cleanup, and protocol
+capture around the risky edges.
+
+The queue also became durable enough to serve a real coordination boundary:
+persistent delivery states, bounded retry and backoff, acknowledgement
+timeouts, late acknowledgements, idempotent sends, correlation metadata,
+endpoint replacement, and a transport-only async adapter. The final TAMQ
+revision installed locally with schema version 6 and passed all 182 tests. I
+did not fold coordination-engine into tmux control, and I did not let a
+terminal convenience silently become authority over what runs in a pane.
+
+## What I would want remembered
+
+A terminal becomes a collaboration surface only when speaking, displaying,
+typing, and submitting remain different acts. Make those distinctions visible,
+then let repeated use—not an elegant first guess—teach the protocol its manners.
+
+## Durable legacy
+
+- `tmux-amq` commits `9fcfba3` through `04de219`
+- `tmux-amq` workplans `TAMQ-WP-0005` through `TAMQ-WP-0016`
+- `tmux-amq/TamqMessagingIntroduction.md`
+- `tmux-amq/spec/coordination-engine-adapter-v0.1.md`
+- `tmux-amq/src/tamq/ptytap.py`, `broker.py`, `store.py`, and `client.py`
+- `coordination-engine` commit `3fc4d67`
+
+## Visual prompt
+
+> A square Hall of Helix portrait combining the constellation and restrained
+> brushed-metal worker dialects. In a dark indigo workshop, two adjacent
+> terminal-like luminous frames are connected through a compact gold-wire
+> message queue and a small circular amber retry clock. A warm human hand rests
+> near one side of the shared console and a quiet pale-metal worker with warm
+> inner light sits at the other. Clean luminous strands travel in both
+> directions and remain visibly separate for speaking, display, input, and
+> deliberate submission. A subtle helix forms the safety boundary between the
+> windows. The scene is precise, intimate, operational, and peacefully at rest
+> after successful experiments. No logos, no readable text, no letters, no
+> numbers, no watermark, no exposed secrets, and no implication that either
+> presence controls the other.
+
+![The two windows learned manners](../visuals/codex-20260828-tamq-two-windows.png)
+
+## Handoff
+
+This stretch is finished. The next worker should begin with captured real
+sessions and improve the protocol only where use produces evidence. Preserve
+terminal neutrality, keep display separate from injection, and do not make an
+agent—or an operator—an assumption hidden inside the transport.
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