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Implements typed inter-agent handoff context per MAST taxonomy (#2023). Adds HandoffContext, RoleContext (6 variants), HandoffOutput, DependencyOutput, HandoffMetrics, and no-op validation stubs in zeph-orchestration::handoff. HandoffConfig added to [orchestration.handoff] TOML section. TaskNode and TaskResult gain optional handoff fields for Phase 2 wiring. No behavior change; all validation methods are no-ops in Phase 1. 16 new unit tests: serialization round-trips, variant coverage, backward compat.
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, #2078) The typed HandoffContext enum, RoleContext variants, and validation layer introduced in #2076 and #2078 are superseded by the rust-agent-handoff skill. Agents follow the handoff protocol via skill instructions injected into their system prompt — no compile-time struct enforcement is needed. Reverts: - handoff.rs (deleted) - typed HandoffConfig in zeph-config - handoff fields in TaskResult/TaskNode - handoff validation metrics in OrchestrationMetrics - scheduler.rs validation/verification wiring Closes #2023
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, #2078) (#2082) The typed HandoffContext enum, RoleContext variants, and validation layer introduced in #2076 and #2078 are superseded by the rust-agent-handoff skill. Agents follow the handoff protocol via skill instructions injected into their system prompt — no compile-time struct enforcement is needed. Reverts: - handoff.rs (deleted) - typed HandoffConfig in zeph-config - handoff fields in TaskResult/TaskNode - handoff validation metrics in OrchestrationMetrics - scheduler.rs validation/verification wiring Closes #2023
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Implements Phase 1 of MAST-informed handoff hardening to reduce multi-agent coordination failures (issue #2023).
Based on MAST research (arxiv 2503.13657): coordination failures account for 36.9% of multi-agent system failures.
Phase 1: Types & Schema
New module:
crates/zeph-orchestration/src/handoff.rsUpdated TaskNode/TaskResult with optional handoff fields (backward compat)
Added HandoffConfig to experiment.rs
All 6280 tests passing, zero clippy warnings
Spec & Review
✅ Spec:
.local/specs/2023-handoff-hardening/spec.md(architect + critic approved)✅ Code review: GO (3 low-priority Phase 2 prep items, no blockers)
✅ Tests: 6280 passed, serialization and backward-compat verified