Replay: Run 1: the goal is achieved. Goal: reduce failed payments caused by gateway timeouts by 20%. The agents plan and build a retry with back-off behind a flag; Core rolls it out 1% → 10% → 50% → 100% as the evidence allows, proves the improvement after 34 simulated minutes, stores the outcome as memory and closes the goal.

Recorded from Lengo Core's real orchestrator, handoff validator, policy engine, statistics and flag controller, driven by simulated Duo agents, CI and GitLab, and synthetic payment traffic (3000 requests a minute; ground truth: off 10.0% failed, 0.3% 5xx, on 7.5% failed, 0.3% 5xx). Demo timings: 5-minute dwell per step, 300 events per arm before any decision, no kill cooldown. Recorded 2026-10-20. Times are simulated minutes.

G-0001 · Reduce failed payments by 20%

closed cycle 1 · flag goal_0001_gateway_retry

Goal: reduce failed payments caused by gateway timeouts.

Goal metric: failure rate

proven

always-valid interval estimate goal

With the flag on: -2.34 pts versus off (always-valid interval -3.17 pts to -1.52 pts), a relative change of -22.8%. Control rate 10.30%; 35522 events with the flag on, 64399 off. Method: msprt.

Guardrails

must not get worse

always-valid interval estimate kill line (tolerance)

http 5xx rate: ok within limits

p95 latency ms: ok treatment p95 within tolerance

Latest decision

#34 at 100% · 2026-10-21 08:34 UTC · tick

goal proven and guardrails clean at 100%

What happened

30 events

flow2026-10-21 08:00 UTC · core

lengo-plan-build started (plan, attempt 1)

session completed
handoff2026-10-21 08:00 UTC · ai-lengo-plan-build-local

strategist → builder: done accepted, citations 100% valid

Plan: retry gateway timeouts behind a flag; watch 5xx and p95.
state2026-10-21 08:00 UTC · core

proposed → planned

Strategist plan validated
handoff2026-10-21 08:00 UTC · ai-lengo-plan-build-local

builder → gatekeeper: done accepted

Opened !1 with policy backoff.
state2026-10-21 08:00 UTC · core

planned → built

Builder opened !1
flow2026-10-21 08:00 UTC · core

lengo-gate started (gate, attempt 1)

session completed
handoff2026-10-21 08:00 UTC · ai-lengo-gate-local

gatekeeper → launcher: pass accepted

Gate verdict: pass. No blocking findings.
state2026-10-21 08:00 UTC · core

built → gate_passed

Gatekeeper verdict: pass
state2026-10-21 08:00 UTC · core

gate_passed → staged

deployed to staging (deployment 1008)
flag2026-10-21 08:00 UTC · core

flag on at 1% (applied)

allow: all checks passed
state2026-10-21 08:00 UTC · core

staged → rollout_1

flag goal_0001_gateway_retry on for 1% of users
flow2026-10-21 08:00 UTC · core

lengo-launch started (launch, attempt 1)

session completed
handoff2026-10-21 08:00 UTC · ai-lengo-launch-local

launcher → analyst: done accepted, citations 100% valid

Release notes posted; Core controls the flag.
flag2026-10-21 08:11 UTC · core

flag at 10% (applied)

allow: all checks passed
state2026-10-21 08:11 UTC · core

rollout_1 → rollout_10

flag expanded to 10%
flow2026-10-21 08:11 UTC · core

lengo-analyze started (analyze_11, attempt 1)

session completed
handoff2026-10-21 08:11 UTC · ai-lengo-analyze-local

analyst → core: done accepted

Expanded to 10%: guardrails clean, evidence growing.
flag2026-10-21 08:16 UTC · core

flag at 50% (applied)

allow: all checks passed
state2026-10-21 08:16 UTC · core

rollout_10 → rollout_50

flag expanded to 50%
flow2026-10-21 08:16 UTC · core

lengo-analyze started (analyze_16, attempt 1)

session completed
handoff2026-10-21 08:16 UTC · ai-lengo-analyze-local

analyst → core: done accepted

Expanded to 50%: guardrails clean, evidence growing.
flag2026-10-21 08:29 UTC · core

flag at 100% (applied)

allow: all checks passed
state2026-10-21 08:29 UTC · core

rollout_50 → rollout_100

flag expanded to 100%
flow2026-10-21 08:29 UTC · core

lengo-analyze started (analyze_29, attempt 1)

session completed
handoff2026-10-21 08:29 UTC · ai-lengo-analyze-local

analyst → core: done accepted

Expanded to 100%: guardrails clean, evidence growing.
state2026-10-21 08:34 UTC · core

rollout_100 → proven

goal proven and guardrails clean at 100%
flow2026-10-21 08:34 UTC · core

lengo-scribe started (scribe, attempt 1)

session completed
handoff2026-10-21 08:34 UTC · ai-lengo-scribe-local

scribe → core: done accepted, citations 100% valid

Outcome report posted.
state2026-10-21 08:34 UTC · core

proven → reported

Scribe posted the outcome report
state2026-10-21 08:34 UTC · core

reported → closed

allow: all checks passed

Memory the agents cited

6 / 6 supplied

ID	Cited by	Source
M-0002	strategist	Outcome M-0002: Reduce failed payments caused by gateway timeouts by 20%
M-0004	strategist	Outcome M-0004: Reduce support tickets about fees by showing the fee before confirming
RB-001#0	strategist	RB-001: Payment gateway timeouts > Overview
M-0002	launcher	Outcome M-0002: Reduce failed payments caused by gateway timeouts by 20%
M-0002	scribe	Outcome M-0002: Reduce failed payments caused by gateway timeouts by 20%
M-0004	scribe	Outcome M-0004: Reduce support tickets about fees by showing the fee before confirming

Agents may cite only IDs Core supplied in the latest context note; anything else counts against citation validity.

Flag changes

When	Change	Status	Time to kill
2026-10-21 08:00 UTC	goal_0001_gateway_retry create → 1%	applied	—
2026-10-21 08:11 UTC	goal_0001_gateway_retry set percentage → 10%	applied	—
2026-10-21 08:16 UTC	goal_0001_gateway_retry set percentage → 50%	applied	—
2026-10-21 08:29 UTC	goal_0001_gateway_retry set percentage → 100%	applied	—