Trial run-2 surfaced the actual blocker: the response-builder MCPs
shared their module-global ``_STATE`` across OpenCode sessions (they're
registered as ``type: local`` in opencode.json, so OpenCode spawns one
subprocess per OpenCode-server lifetime, not per session). The CA2/PD5
cross-session reset I added in the M-batch keyed on
``identity.attempt_id`` — but the prompt template literally read:
1. ``estimator_start(attempt_id=..., workflow_id=..., ...)``
The ``...`` were placeholder ellipses, not interpolated. So agents
guessed ``attempt_id=1`` every single time. The cross-session reset
compared ``1 == 1``, decided "same attempt — no reset", and the prior
attempt's ``finalized=True`` persisted forever. Every estimator
session after the first failed with ``"response already finalized;
no further mutations allowed"`` on every ``_set_*`` call → no
finalize → 30s worker timeout → workflow STUCK.
Observed in trial run-2: 2 successes (attempts 1, 2), then 15
consecutive failures (attempts 3–17 across all 6 workflows) before
the pickup_guard would have STUCK every workflow.
Two fixes (defense in depth):
1. **Unconditional reset on _start** in all 5 builders. We can't
distinguish "agent retry in same session" from "new session reusing
this MCP" reliably — the observable signature is identical. Just
reset whenever ``_STATE.started`` is True; ``reset_for_new_attempt``
logs a WARN if the prior state was in-flight so abandoned attempts
are still visible to ops. The agent's last ``_start`` always wins.
2. **Interpolate real attempt_id + workflow_id + pr_number + head_sha
into all 5 prompts' Output contract sections**. The agent_runner
now injects ``attempt_id`` into ``input_payload`` (matching the
existing ``workspace_dir`` injection pattern). Each ``build_*_prompt``
reads ``input_payload.get("attempt_id")`` and bakes the concrete
value into the MCP-call signature shown to the agent, plus a
``PASS THESE EXACT VALUES`` directive.
Also strengthened each prompt's ``_finalize`` line with
``**You MUST call this tool — without it the controller times out.**``
so the agent understands the contract is hard, not optional.
Updated tests:
- ``test_double_start_refused`` → ``test_double_start_resets_silently``:
pins the new permissive-reset behavior + asserts the WARN log fires.
- ``test_implementer_rejects_intra_session_double_start`` updated for
same reason; now asserts the second _start succeeds + last-wins
semantics (used_tier == new tier).
- NEW ``test_prompt_interpolates_real_attempt_id`` parametrized over
all 5 roles: asserts ``attempt_id=42`` + ``workflow_id=7`` appear
literally in the rendered prompt AND that ``attempt_id=...`` /
``workflow_id=...`` placeholders DO NOT.
Total: 795 → 800 tests, 0 regressions.
The model-override files (.md + .txt) are still in place from the
prior turn — that change is orthogonal to this bug fix; OpenCode
ignores the dispatcher's pass-through per the README, and the actual
generation has been on haiku the whole time. The .md frontmatter
change to sonnet will only take effect on the next OpenCode restart.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
drew
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