A race becomes
evidence.

Interleave captures the dispatch, the human edit, and the delayed completion as one inspectable session.

Native tool calls and human actions on one timeline
Expected and actual state compared at the failure
A minimized sequence that replays deterministically
Recorded session
Plane metadata crawler · 8.8 seconds
CAPTURED
Agent queues metadata crawlReads “Plane documentation”
+846 ms
Human saves explicit metadataChanges to “Human verified runbook”
+2.3 s
Delayed worker overwrites itRestores stale metadata
+8.8 s
PRESERVATION RULEVIOLATED

Metadata saved after dispatch must survive that stale completion.

ExpectedHuman verified runbook
ActualPlane documentation
Source verified

Plane #9674,
reproduced locally.

The fixture follows Plane’s public issue and pinned source, then proves a revision guard against the same recording.

From one incident
to a reusable guardrail.

Every artifact stays connected to the exact behavior that produced it.

01

Record

Capture native WebMCP calls and browser state.

02

Replay

Run the same ordering against both modes.

03

Minimize

Reduce the incident to three essential commands.

04

Export

Generate a deterministic regression test.

Evidence you
can inspect.

Interleave does not stop at a warning. It leaves a recording, a minimal reproduction, and a test a maintainer can keep.

9

Native WebMCP tools

The agent drives the real application contract exposed by the page.

3

Commands after reduction

Dispatch, human edit, stale completion: the smallest reliable proof.

50/50

Project checks passing

49 core checks plus the exported Plane regression, all passing.

The proof ends
in a contribution.

A failure is useful when it becomes a fix maintainers can review and a regression the project can keep.

REVIEW ARTIFACT

A real Plane patch.

Pinned to commit da1a7ab8 and prepared locally for maintainer review.

  • Checks the dispatch revision before applying crawler output
  • Preserves metadata explicitly saved while work is pending
  • Covers stale and current completion paths with focused tests
Revision guardedstale work ignored
Run proof

A regression teams can keep.

Export the failure as portable evidence, then rerun it against the fix.

  • Portable session JSON
  • Minimal replay recipe
  • Runnable JavaScript regression
  • Local Plane patch and test artifact
Integrate the recorder