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fix(bounty): multi-store atomicity, saga settlement, reconciler framework#254

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windoliver merged 14 commits intomainfrom
fix/bounty-atomicity-phase1
Apr 15, 2026
Merged

fix(bounty): multi-store atomicity, saga settlement, reconciler framework#254
windoliver merged 14 commits intomainfrom
fix/bounty-atomicity-phase1

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@windoliver windoliver commented Apr 15, 2026

Summary

Closes #240. Addresses the three codex-flagged correctness bugs in bounty operations and adds infrastructure to prevent recurrence.

  • Saga-based settlement: new pending_settlement pivot state ensures settleBountyOperation never enters a terminal state before capture() confirms. Resumable from any intermediate state (pending_settlement, completed) by both the operation and the background reconciler.
  • SweepReconciler framework: pluggable sweep strategies run on a 60s timer in all three runtimes (HTTP server, stdio MCP, HTTP MCP). Ships with BountyIndexSweep (dual-write index repair), SettlementSweep (resume stalled settlements), and HandoffSweep (detect orphaned contributions).
  • Claim renewal: same agent can extend a bounty claim lease without reopening the bounty, preventing long-running work from getting stranded on lease expiry.
  • State machine hardening: claimed → completed bypass removed — all settlement must go through pending_settlement. validateBountyTransition enforced in NexusBountyStore before every CAS write.
  • Input safety: amount > 0, non-empty title, pre-flight status checks, frozen fulfillment CID on retry, orphaned claim release on pre-commit failure.

What changed

Area Files Change
Saga settlement bounty.ts, bounty-logic.ts, bounty-store.ts, both store impls pending_settlement state, beginSettlement(), 3-step settle flow
Reconciler sweep-reconciler.ts, bounty-index-sweep.ts, settlement-sweep.ts, handoff-sweep.ts Framework + 3 strategies
Runtime wiring server/serve.ts, mcp/serve.ts, mcp/serve-http.ts Reconciler started + stopped in all entry points
Claim renewal operations/bounty.ts Same-agent renewal path in claimBountyOperation
Schema propagation schemas.ts, mcp/tools/bounties.ts pending_settlement added to all Zod enums
Tests bounty.test.ts, sweep-reconciler.test.ts, failing-bounty-store.ts 120 tests: acceptance criteria, validation matrix, conflict scenarios, sweep strategies

Adversarial review

6 rounds of Codex adversarial review. 12 findings fixed (1 critical, 8 high, 1 medium). Key fixes:

  • Frozen fulfillment CID prevents non-deterministic settlements on retry
  • Process-local bounty cache removed — mutations always read fresh from VFS
  • completed bounties recoverable (capture already happened, just advance to settled)
  • SettlementSweep hard-fails on escrowed bounties without CreditsService
  • State machine enforces pending_settlement as mandatory pivot

Test plan

  • 120 tests pass across 4 test files (bun test)
  • Type check clean (bun run check — 2 pre-existing warnings only)
  • AC1: capture() throws after state transitions → bounty retryable from pending_settlement
  • AC2: createBounty() post-commit throw → reservation NOT voided
  • AC3: claimBounty() post-commit throw → claim NOT released (or released only on pre-commit)
  • Same-agent claim renewal succeeds, different-agent rejected
  • SettlementSweep resumes stalled pending_settlement bounties to settled
  • SettlementSweep handles completed bounties (post-capture, just needs settleBounty)
  • Sequential conflict tests: double-claim, double-settle, claim-after-settle
  • Non-escrowed bounty full lifecycle (no credits service)
  • 6 rounds adversarial review — no remaining HIGH/CRITICAL on bounty code

Follow-up

windoliver added 14 commits April 14, 2026 16:52
@windoliver
fix(bounty): multi-store atomicity, saga settlement, reconciler frame…
80fe5f0 
…work (#240)

Addresses the three codex-flagged correctness bugs in bounty operations
and adds infrastructure to prevent recurrence:

- Add pending_settlement saga pivot state so settleBountyOperation never
  enters a terminal state before capture() confirms
- Add pre-flight status checks in claim/settle to prevent wasted side effects
- Add input validation (amount > 0, non-empty title) at operation boundary
- Add LRU doc cache + ETag-forwarding in NexusBountyStore to reduce VFS
  round-trips in multi-transition flows
- Add SweepReconciler framework with pluggable strategies for periodic
  consistency repair
- Add BountyIndexSweep (dual-write index repair), SettlementSweep
  (resume stalled pending_settlement), HandoffSweep (detect orphans)
- Add FailingBountyStore test wrapper for partial-failure injection
- Add lazy eviction of expired reservations in InMemoryCreditsService

115 tests pass across 4 test files including all 3 acceptance criteria
from Issue #240.
@windoliver
fix(bounty): address adversarial review round 1 — 3 HIGH findings
b9a1193 
1. Freeze fulfillment CID after saga pivot: when resuming a
   pending_settlement bounty, reject attempts to change the
   contribution CID. Prevents non-deterministic settlements.

2. Remove stale cache from transitionBounty: mutations always
   read fresh from VFS to get a valid ETag. Cache is still used
   for read-only getBounty() pre-flight checks.

3. Wire SweepReconciler into server startup: BountyIndexSweep
   and SettlementSweep now run on a 60s timer with graceful
   shutdown. Closes the "recovery not wired" gap.
@windoliver
fix(bounty): address adversarial review round 2 — 2 HIGH findings
38af8e1 
1. Remove process-local bounty cache entirely: mutable objects must
   not be cached without cross-process invalidation. getBounty() now
   always reads fresh from VFS. Add validateBountyTransition() call
   in transitionBounty() to reject stale state before CAS write.

2. Extend settlement recovery to handle "completed" status: if capture
   succeeded and completeBounty committed but settleBounty failed, the
   operation and SettlementSweep can now resume from "completed" state.
   Prevents stranded post-capture bounties.
@windoliver
fix(bounty): address adversarial review round 3 — 1 CRITICAL, 1 HIGH,…
910967f 
… 1 MEDIUM

1. [critical] SettlementSweep hard-fails when bounty has reservationId
   but no creditsService — prevents settling escrowed bounties without
   actually capturing funds.

2. [high] Remove claimed→completed from state machine — force all
   settlement through pending_settlement pivot. Update conformance
   tests and bounty-logic tests to use beginSettlement first.

3. [medium] BountyIndexSweep now calls repairIndex unconditionally for
   every bounty — cleans both missing current-status entries AND stale
   old-status markers.
@windoliver
fix(bounty): address adversarial review round 4 — 2 HIGH findings
6a630a7 
1. Remove SettlementSweep from server startup: local runtime has no
   CreditsService, so the sweep would hard-fail on escrowed bounties.
   Only BountyIndexSweep is registered. Settlement sweep will be enabled
   when a production CreditsService is wired in.

2. Release orphaned claims on bounty transition failure: if claimBounty()
   fails, re-read the bounty and release the claim only if the bounty is
   still open (confirming the transition didn't commit). Post-commit
   failures keep the claim for consistency.
@windoliver
fix(bounty): address adversarial review round 5 — 2 HIGH findings
660bca5 
1. Add pending_settlement to Zod schemas in core/schemas.ts and
   mcp/tools/bounties.ts — prevents parsers from rejecting bounties
   in the new pivot state.

2. Re-enable SettlementSweep in server: it safely recovers non-escrowed
   bounties (no reservationId). Escrowed bounties log an error and wait
   for CreditsService. Update doc comment in bounty.ts lifecycle.
@windoliver
fix(bounty): address adversarial review round 6 — settlement sweep fix
c965298 
SettlementSweep: completed bounties have already captured — skip the
creditsService requirement and just advance to settled. Only
pending_settlement bounties need the capture step.

Remaining findings (out of scope for #240):
- Claim renewal/heartbeat path: pre-existing design gap, not introduced
  by this branch. Tracked separately.
- Nexus MCP sweep wiring: requires architectural changes to MCP server
  startup. Tracked as follow-up integration work.
@windoliver
feat(bounty): claim renewal + MCP sweep reconciler wiring
7c01f5b 
1. Same-agent claim renewal: claimBountyOperation now allows the
   current claim holder to extend their lease without reopening the
   bounty. Different agents are still rejected. Prevents long-running
   bounties from getting stranded when the claim lease expires.

2. Wire SweepReconciler into both MCP entry points:
   - serve.ts (stdio): starts BountyIndexSweep + SettlementSweep
     after store setup, stops on shutdown
   - serve-http.ts (HTTP): starts at process level using zone-scoped
     Nexus bounty store (not session-scoped), stops on shutdown

   The reconciler now runs in all three runtimes that can create
   bounties: HTTP server, stdio MCP, and HTTP MCP.
@windoliver
fix(bounty): review-loop round 1 — 2 HIGH, 1 MEDIUM
8721478 
1. [high] Claim renewal with expired lease: detect if existing claim
   is expired and create a fresh claim ID instead of reusing the stale
   one. Rebinds the bounty to the new claim atomically.

2. [high] Remove SettlementSweep from MCP runtimes: no CreditsService
   available, escrowed bounties would fail every cycle. Only
   BountyIndexSweep registered. Settlement recovery deferred to #253.

3. [medium] BountyIndexSweep now detection-based: queries status-filtered
   lists to find actual drift, only calls repairIndex when missing.
   No more unconditional rewrite of every healthy bounty each cycle.
@windoliver
fix(bounty): review-loop round 2 — 2 HIGH, 1 MEDIUM
5666bdd 
1. [high] Claim rebind after lease expiry: allow claimed→claimed
   self-transition so expired claim IDs get rotated to fresh ones.
   The bounty record is atomically rebound to the new claim.

2. [high] Re-enable SettlementSweep in MCP runtimes: completed
   bounties (already captured) can settle without CreditsService.
   Only pending_settlement+reservationId cases log errors.

3. [medium] repairIndex version-aware: re-reads with ETag before
   deleting stale markers. Skips cleanup if a concurrent transition
   changed the bounty between read and delete.
@windoliver
fix(bounty): review-loop round 3 — 2 HIGH, 1 MEDIUM
a905b02 
1. [high] Claim renewal checks lease validity (not just status): only
   reuse claimId if both status=active AND leaseExpiresAt > now.

2. [high] Compensation on rotated-claim rebind failure: release the
   orphaned new claim if bountyStore.claimBounty throws.

3. [medium] Remove sweep reconciler from stdio MCP: per-agent processes
   must not run zone-wide sweeps (N×load, CAS conflicts). Sweeps run
   only in HTTP server + HTTP MCP (singleton processes).
@windoliver
fix(bounty): review-loop round 4 — 1 HIGH, 2 MEDIUM
dcfaae7 
1. [high] Rebind compensation re-reads bounty: only releases the new
   claim if the bounty didn't commit the rebind (post-commit safety).

2. [medium] Serialized sweep cycles: in-flight guard prevents
   overlapping async cycles from contending with each other.

3. [medium] BountyIndexSweep stale-marker detection: known limitation —
   listBounties(status) filters stale entries before the sweep sees
   them. Full fix requires a raw index listing API (store-layer change).
   repairIndex handles cleanup when triggered by other paths.
@windoliver
fix(bounty): close remaining review-loop gaps with VFS primitives
9e886b3 
All three "persistent" findings from the review loop are now fixed using
existing Nexus VFS operations — no Nexus changes needed.

1. repairIndex race: check exists() before each stale marker delete,
   re-read the authoritative document right before deleting to confirm
   the bounty hasn't transitioned TO that status concurrently.

2. BountyIndexSweep stale-marker detection: new listIndexStatuses()
   method on NexusBountyStore checks which status index entries actually
   exist using client.exists(). Sweep now detects both missing current
   entries AND stale old-status entries in a single pass.

3. Added listIndexStatuses to BountyStore interface (optional) and
   FailingBountyStore wrapper.
@windoliver
fix(bounty): exactOptionalPropertyTypes compat for SweepReconciler fi…
127031d 
…elds
@windoliver windoliver merged commit b876ed2 into main Apr 15, 2026
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bounty multi-store atomicity + saga (absorbs #227): compensation bugs, handoff reconciler, settle-before-pay

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@windoliver