Adds a reproduction harness for Issue 4 of the 2026-04-28 CP review,
referenced in RFC molecule-core#2251. The RFC review (issue #2251
comment) flagged that Issue 4 was hypothesized but not reproduced
before V1.0 implementation begins — this script closes that gap.
What it does:
- Provisions a coordinator (PM, claude-code-default) + 1 child
(Researcher, langgraph) via the platform API.
- Sends an A2A kickoff with a synthesis-heavy task that requires
SYNTHESIS_DEPTH (default 3) sequential delegations followed by a
600-word post-delegation synthesis.
- Times the coordinator's full A2A round-trip with millisecond
precision and emits one JSON event per phase (machine-readable).
- Pulls the coordinator's heartbeat trace post-run so the team can
see whether any platform-side state transition fired during the
long synthesis (the V1.0 RFC's MAX_TASK_EXECUTION_SECS would
surface as such a transition; absence of one in this trace
confirms the RFC's premise).
Why a measurement harness, not a pass/fail test:
Issue 4's claim is "absence of platform-side bound", which is hard
to assert in a single CI run. Outputting structured measurement
data lets the team interpret across multiple runs / staging vs
prod / different SYNTHESIS_DEPTH values rather than relying on one
reproduction snapshot.
The script's header has the full interpretation guide:
- ELAPSED < 60s → not informative (LLM was just fast)
- 60–300s → within DELEGATION_TIMEOUT, ambiguous
- >= 300s without trace transitions → BUG CONFIRMED
- curl_failed → coordinator hung past A2A_TIMEOUT or genuinely
slow (disambiguate by querying status separately)
Doesn't run in CI by default — invoked manually against staging or a
local platform with PLATFORM=... and OPENROUTER_API_KEY=... env vars.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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