feat(agent): add circuit breaker (#345) - #416
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Abidoyesimze merged 2 commits intoSep 2, 2026
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Add an agent circuit breaker that halts agent-initiated rebalancing when the market, a protocol, or a user shows risk. Withdrawals are untouched. - Pure trip rules (breakerRules.ts): abnormal-loss drawdown, stablecoin de-peg (fails safe on a missing feed), rebalance oscillation, stale APY. - Pure CLOSED/OPEN/HALF_OPEN state machine (breakerState.ts) with cooldown backoff and manual trip/reset. - Integration (breakerService.ts): measurement loads, per-tick evaluation, fail-closed halting, operator alerts, user events, status surfaces. - Loop wiring: GLOBAL > PROTOCOL > USER blocking, BLOCKED decisions, blockedProtocols target exclusion, agent status + per-user status route. - Admin endpoints: list/trip/reset breakers with audit logging. - Prometheus gauge + counters and alert rules; RUNBOOK + OBSERVABILITY docs. - Tests: 5 new suites (rules, state machine, service status/privacy, loop blocking, target exclusion) + harness update. De-peg is a pure rule consuming a price input; no live feed exists yet so getStablecoinPrice() returns null (fails safe) and the rule stays off by default (BREAKER_DEPEG_ENABLED=false).
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Summary
Implements the Agent Circuit Breaker (#345): halts agent-initiated rebalancing when the market, a protocol, or a user shows risk. Withdrawals are untouched (acceptance criterion).
Changes
src/agent/breakerRules.ts): abnormal-loss drawdown, stablecoin de-peg, rebalance oscillation, stale APY — all deterministic, DB/clock-free.src/agent/breakerState.ts):CLOSED → OPEN → HALF_OPEN → CLOSEDwith cooldown backoff and manual trip/reset.src/agent/breakerService.ts): measurement loads, per-tick evaluation, fail-closed halting, operator alerts, user events, sync status surfaces.GLOBAL > PROTOCOL > USERblocking precedent,BLOCKEDdecision records,blockedProtocolstarget exclusion,GET /agent/status+ per-user breaker status.requireAdminScope('agent')).agent_breaker_stategauge +agent_breaker_trips_totalcounter, Prometheus alert rules, RUNBOOK + OBSERVABILITY docs.De-peg feed gap (documented, see RUNBOOK §9)
The de-peg rule is a pure consumer of a stablecoin spot price. No live feed exists in this codebase yet (the fee oracle publishes fees only;
routing.tsis a stub), sogetStablecoinPrice()returnsnull(fails safe — never trips) and the rule is off by default (BREAKER_DEPEG_ENABLED=false).getStablecoinPrice()is the single integration point to wire a feed later.Verification
pnpm/npm:typecheck,lint,prettierall pass1695tests pass, incl. 5 new suites: rules, state machine, service status/privacy, loop blocking, target exclusionCloses #345