research-git/playbook 01
01/04
PUBLIC HISTORY · COUNTERFACTUAL PLAYBOOK

Time travel is easy.Feature travel is hard.

Four real Codex features were added, removed, and rebuilt. Replay the idea—not the old diff.

Inspect source PRs
12 PRs•4 feature arcs•openai/codex
WebSocket transport
REPLAYED

Reapplied with split event loops

View evidence ↗
01CASE FILES

Four removals.
Four different kinds of return.

Each arc is reconstructed from public Codex PRs. Pick a capsule to see what disappeared, what survived, and what had to change on the way back.

CAPSULE 01 / 04

WebSocket transport

ADAPTED REPLAY6 DAYS

A multi-client transport shipped, was pulled after a suspected deadlock, then returned with the same intent and a safer concurrency model.

transportconcurrencyreliability
03
FEB 11 · 2026

Reapplied with split event loops

The transport returns with dedicated inbound and outbound tasks so full queues cannot couple the two paths.

This is the clearest capsule replay: preserve the feature contract, regenerate its implementation against the newly understood constraint, and stress-test 10+ concurrent requests.

PUBLIC RECORD
PR #11370 ↗
7053aa54
TOUCHED SURFACEapp-server/src/transport.rsapp-server/src/lib.rstests/suite/v2/connection_handling_websocket.rs
02REPLAY LAB

Same feature.
Different destination.

CAPSULE REGENERATOR
WebSocket · TODAY'S CODE
REPLAY PATH
01Recall idea
→
02Read today’s code
→
03Regenerate
WHAT THIS CAPSULE WOULD REMEMBER01 / WebSocket transport
01 · INTENT

Let multiple clients use app-server over WebSockets without leaking responses across connections.

02 · INVARIANTS

Initialization is per connection; replies return to their origin; saturated queues cannot deadlock ingress and egress.

03 · CODE SLICES

Transport parsing, connection state, inbound/outbound routing, WebSocket integration coverage.

04 · RESURRECTION GUIDE

Rebuild around independent inbound/outbound tasks, retain bounded queues, then replay the connection-isolation tests.

03THE PLAYBOOK

Git remembers
what changed.

research-git remembers why.

ABOUT THIS DEMO

These feature arcs are factual reconstructions from public Codex PRs. research-git was not used in the historical changes; this demo shows how their intent could have been captured and replayed as Feature Capsules.

Explore research-git Read the capsule spec