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GAP-HADAPT-004: Harness Fallback Chains reference

Define fallback harness sequences. If primary harness fails or is unavailable, automatically try next in chain.

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GAP-HADAPT-004: Harness Fallback Chains

Field	Value
Category	harness-adaptation
Priority	High
Effort	M
Status	Missing

Description

Define fallback harness sequences. If primary harness fails or is unavailable, automatically try next in chain.

Current State

Single harness per run. Failure = run failure. No fallback.

Target State

Configurable fallback chains per task kind. If primary harness fails, retry with next harness in chain. Fallback configured at run, session, or global level.

Dependencies

GAP-HADAPT-001 -- capability routing for fallback selection
GAP-HADAPT-005 -- health monitoring for failure detection

Key Files

Component	Path
Harness invoker	`packages/sdk/src/harness/invoker.ts`
Adapter registry	`packages/sdk/src/harness/registry.ts`

Recommendation

Phase 2 implementation. Define fallback chain configuration. Implement retry with next harness on failure. Log fallback decisions.