Replay
Replay is one of the fundamental guarantees of the Forge Pool execution platform.
It ensures that completed executions remain reproducible, inspectable, and auditable long after execution has finished.
Replay is therefore part of the public execution contract rather than a debugging capability.
Public Guarantee
Every successful execution produces sufficient execution evidence to support deterministic replay.
Replay enables workloads to be:
- reproduced
- independently verified
- audited
- inspected over time
- defended in regulated and high-trust environments
Replay is produced as part of execution itself.
It is never an afterthought.
Execution Truth
Replay depends on preserving execution truth.
Execution truth consists of:
- execution contract
- workload identity
- execution semantics
- deterministic seed behavior
- execution-unit planning
- reduction semantics
- execution evidence
Equivalent execution truth must always enable equivalent replay.
Replay Evidence
Replay is supported through execution evidence produced during execution.
Execution evidence may include:
- replay metadata
- execution summaries
- execution metrics
- artifact references
- verification outcomes
- execution manifests
- result hashes
Execution evidence forms part of the execution result rather than an operational by-product.
Replay Metadata
Replay metadata preserves the information required to reproduce execution.
Typical replay metadata includes:
- workload identity
- root seed
- execution profile
- execution parameters
- execution policy
- execution-unit references
- reduction metadata
The precise representation may evolve.
The replay guarantees remain unchanged.
Seed Preservation
Replay requires deterministic seed behavior.
Forge Pool supports:
Explicit Seeds
The original root seed is preserved.
Derived Seeds
The execution platform preserves the deterministic derivation required to reconstruct the original root seed.
Execution-unit seed derivation must remain reproducible in both cases.
Artifact Preservation
Certain execution profiles require artifacts for complete replay or audit.
Replay artifacts may include:
- execution manifests
- result surfaces
- verification reports
- execution summaries
- workload-specific artifacts
Artifacts used for replay should remain:
- immutable
- version-aware
- hash-addressed where applicable
- suitable for long-term inspection
Artifacts preserve execution truth rather than execution convenience.
Replay Guarantees
Equivalent execution evidence guarantees:
- equivalent replay behavior
- equivalent computational meaning
- equivalent verification capability
- equivalent auditability
Replay therefore preserves execution truth rather than execution infrastructure.
Replay and Retry
Replay and retry serve different purposes.
Retry attempts execution again after operational failure.
Replay reproduces previously completed execution for verification, inspection, or audit.
Retry is operational.
Replay is contractual.
Replay and Logging
Replay is not equivalent to logging.
Logs describe execution.
Replay preserves execution truth.
A system that can describe execution but cannot reproduce or validate it does not provide complete replay.
Long-Term Trust
Replay enables execution to remain trustworthy beyond the original execution event.
Replay allows:
- independent validation
- incident investigation
- regulatory review
- execution accountability
- historical inspection
Without replay, execution becomes increasingly difficult to defend over time.
Relationship to Determinism
Determinism defines reproducibility.
Replay preserves reproducibility.
Together they establish long-term execution consistency.
See:
Relationship to Verification
Replay provides the execution evidence required for independent verification.
Verification confirms that preserved execution truth remains valid.
See:
Implementation Independence
Replay guarantees remain valid regardless of:
- runtime topology
- scheduling strategy
- orchestration implementation
- deployment model
- participating execution infrastructure
Only observable replay behavior forms part of the public execution contract.
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Replay is best understood through repeated execution.
Execute the same workload multiple times, inspect replay metadata, compare execution evidence, and validate that equivalent execution contracts preserve equivalent computational meaning.
Trust should be established through independent verification rather than documentation alone.
Final Note
Replay does not preserve infrastructure.
Replay preserves execution truth.
By separating execution evidence from runtime implementation, Forge Pool enables deterministic replay, long-term auditability, and independent verification across every execution capability exposed by the platform.