# execution_plane v0.3.0 - Table of Contents

> Execution Plane provides shared lower-runtime contracts, behaviours,
codecs, placement descriptors, and pure helpers for Execution Plane lane
adapters, node hosts, and runtime family kits.

## Pages

- Overview
  - [Execution Plane Package](readme.md)
  - [Execution Plane Guide](guides_index.md)

- Publishing
  - [Changelog](changelog.md)
  - [LICENSE](license.md)

- Technical
  - [Repo Topology And Package Map](repo_topology.md)
  - [Brain, Spine, And Harness Alignment](brain_spine_alignment.md)

- Package Homes
  - [core/execution_plane_contracts](execution_plane_contracts.md)
  - [core/execution_plane_kernel](execution_plane_kernel.md)
  - [placements/execution_plane_local](execution_plane_local.md)
  - [placements/execution_plane_ssh](execution_plane_ssh.md)
  - [placements/execution_plane_guest](execution_plane_guest.md)
  - [conformance/execution_plane_testkit](execution_plane_testkit.md)

## Modules

- [ExecutionPlane](ExecutionPlane.md): Lower-runtime substrate for shared execution contracts and runtime helpers.

- [ExecutionPlane.ActiveExecution](ExecutionPlane.ActiveExecution.md): Opaque admitted execution/session identity returned by Runtime Client start.
- [ExecutionPlane.ActivitySideEffectIdempotency](ExecutionPlane.ActivitySideEffectIdempotency.md): Activity-facing side-effect idempotency contract for Phase 4 durable workflows.
- [ExecutionPlane.Admission.Decision](ExecutionPlane.Admission.Decision.md): Admission decision.
- [ExecutionPlane.Admission.Rejection](ExecutionPlane.Admission.Rejection.md): Admission rejection.
- [ExecutionPlane.Admission.Request](ExecutionPlane.Admission.Request.md): Runtime-client admission request.
- [ExecutionPlane.AttachGrantContract](ExecutionPlane.AttachGrantContract.md): Lease-bound attach grant contract.
- [ExecutionPlane.Authority.Ref](ExecutionPlane.Authority.Ref.md): Opaque authority reference. The root carries it and never interprets policy semantics.
- [ExecutionPlane.Authority.Verifier](ExecutionPlane.Authority.Verifier.md): Authority verifier behaviour registered by node hosts.
- [ExecutionPlane.CancellationMetadata](ExecutionPlane.CancellationMetadata.md): Cancellation metadata linked to authority, workflow, and lower run refs.
- [ExecutionPlane.Codec](ExecutionPlane.Codec.md): Canonical JSON codec helpers for root boundary contracts.

- [ExecutionPlane.ContractVersion](ExecutionPlane.ContractVersion.md): Root Execution Plane boundary contract version.

- [ExecutionPlane.Contracts](ExecutionPlane.Contracts.md): Canonical helpers for the Execution Plane contract packet.
- [ExecutionPlane.Contracts.AdapterSelectionPolicy.V1](ExecutionPlane.Contracts.AdapterSelectionPolicy.V1.md): Owner-repo adapter selection rule for Phase 6 lower simulation.
- [ExecutionPlane.Contracts.AttachGrant.V1](ExecutionPlane.Contracts.AttachGrant.V1.md): Phase 4 lease-bound attach grant for hazmat stream/session access.

- [ExecutionPlane.Contracts.AuthorityDecision.V1](ExecutionPlane.Contracts.AuthorityDecision.V1.md): Packet-local Brain contract baseline carried across the lower stack.

- [ExecutionPlane.Contracts.BoundarySessionDescriptor.V1](ExecutionPlane.Contracts.BoundarySessionDescriptor.V1.md): Durable Spine-owned boundary/session descriptor.

- [ExecutionPlane.Contracts.CredentialHandleRef.V1](ExecutionPlane.Contracts.CredentialHandleRef.V1.md): Reference to short-lived execution-time secret or workload identity material.

- [ExecutionPlane.Contracts.ExecutionEvent.V1](ExecutionPlane.Contracts.ExecutionEvent.V1.md): Append-only raw execution fact emitted by the Execution Plane.

- [ExecutionPlane.Contracts.ExecutionEvidenceBoundary.V1](ExecutionPlane.Contracts.ExecutionEvidenceBoundary.V1.md): Bounded report boundary for `ExecutionOutcome.v1`.
- [ExecutionPlane.Contracts.ExecutionIntentEnvelope.V1](ExecutionPlane.Contracts.ExecutionIntentEnvelope.V1.md): Spine-to-Execution neutral intent envelope.

- [ExecutionPlane.Contracts.ExecutionOutcome.V1](ExecutionPlane.Contracts.ExecutionOutcome.V1.md): Terminal or checkpointed raw execution outcome emitted by the Execution Plane.

- [ExecutionPlane.Contracts.ExecutionRoute.V1](ExecutionPlane.Contracts.ExecutionRoute.V1.md): Spine-owned durable route choice carried to and from the Execution Plane.

- [ExecutionPlane.Contracts.Failure](ExecutionPlane.Contracts.Failure.md): Structured failure payload used by `ExecutionOutcome.v1`.

- [ExecutionPlane.Contracts.FailureClass](ExecutionPlane.Contracts.FailureClass.md): Typed failure-class enum for the shared contract packet.

- [ExecutionPlane.Contracts.HttpExecutionIntent.V1](ExecutionPlane.Contracts.HttpExecutionIntent.V1.md): HTTP-family execution intent.
- [ExecutionPlane.Contracts.JsonRpcExecutionIntent.V1](ExecutionPlane.Contracts.JsonRpcExecutionIntent.V1.md): JSON-RPC-family execution intent.
- [ExecutionPlane.Contracts.LaneFact.V1](ExecutionPlane.Contracts.LaneFact.V1.md): Neutral bounded lower-lane fact.
- [ExecutionPlane.Contracts.LowerSimulationEvidence.V1](ExecutionPlane.Contracts.LowerSimulationEvidence.V1.md): Bounded evidence that a lower-runtime simulation scenario produced an
`ExecutionOutcome.v1` without external side effects.
- [ExecutionPlane.Contracts.LowerSimulationScenario.V1](ExecutionPlane.Contracts.LowerSimulationScenario.V1.md): Phase 6 lower-runtime scenario contract owned by Execution Plane.
- [ExecutionPlane.Contracts.NoBypassScan.V1](ExecutionPlane.Contracts.NoBypassScan.V1.md): Source-boundary proof that hazmat Execution Plane APIs are not imported by public code.

- [ExecutionPlane.Contracts.NoEgressPolicy.V1](ExecutionPlane.Contracts.NoEgressPolicy.V1.md): Fail-closed no-egress policy for lower-runtime simulation boundaries.

- [ExecutionPlane.Contracts.PersistencePosture](ExecutionPlane.Contracts.PersistencePosture.md): Ref-only persistence posture for lower target and attach surfaces.
- [ExecutionPlane.Contracts.ProcessExecutionIntent.V1](ExecutionPlane.Contracts.ProcessExecutionIntent.V1.md): Process-family execution intent.
- [ExecutionPlane.Contracts.StreamAttachRevocation.V1](ExecutionPlane.Contracts.StreamAttachRevocation.V1.md): Revocation evidence proving an attached stream stopped after grant or lease revocation.

- [ExecutionPlane.Contracts.StreamBackpressure.V1](ExecutionPlane.Contracts.StreamBackpressure.V1.md): Deterministic stream pressure and termination evidence.

- [ExecutionPlane.Contracts.TargetPosture.V1](ExecutionPlane.Contracts.TargetPosture.V1.md): Phase 5 target posture and attach authorization contract.

- [ExecutionPlane.Contracts.WorkerBudget.V1](ExecutionPlane.Contracts.WorkerBudget.V1.md): Worker admission and pressure-shedding evidence for tenant-scoped budgets.

- [ExecutionPlane.DiagnosticResult](ExecutionPlane.DiagnosticResult.md): Structured result emitted by the diagnostic execution lane.

- [ExecutionPlane.Evidence](ExecutionPlane.Evidence.md): Serializable execution evidence envelope.
- [ExecutionPlane.Evidence.Sink](ExecutionPlane.Evidence.Sink.md): Evidence sink behaviour registered by node hosts.
- [ExecutionPlane.ExecutionActivityMetadata](ExecutionPlane.ExecutionActivityMetadata.md): Execution activity metadata consumed by Mezzanine activities.
- [ExecutionPlane.ExecutionEvent](ExecutionPlane.ExecutionEvent.md): Serializable execution event envelope.
- [ExecutionPlane.ExecutionRef](ExecutionPlane.ExecutionRef.md): Opaque execution reference.
- [ExecutionPlane.ExecutionRequest](ExecutionPlane.ExecutionRequest.md): Lane/Target execution request produced after admission.
- [ExecutionPlane.ExecutionResult](ExecutionPlane.ExecutionResult.md): Serializable execution result.
- [ExecutionPlane.Family.HTTPGateway](ExecutionPlane.Family.HTTPGateway.md): HTTP unary/incremental lifecycle with explicit demand and cancellation.
- [ExecutionPlane.Family.HTTPRequest](ExecutionPlane.Family.HTTPRequest.md): Validated unary or incremental HTTP-family request contract.
- [ExecutionPlane.Family.ProcessGateway](ExecutionPlane.Family.ProcessGateway.md): Process lifecycle without flattening interactive input and termination.
- [ExecutionPlane.Family.ProcessRequest](ExecutionPlane.Family.ProcessRequest.md): Validated process-family start contract.
- [ExecutionPlane.Family.WebSocketGateway](ExecutionPlane.Family.WebSocketGateway.md): WebSocket connect/send/backpressure/reconnect/revocation/close lifecycle.
- [ExecutionPlane.Family.WebSocketRequest](ExecutionPlane.Family.WebSocketRequest.md): Validated WebSocket connect and resume contract.
- [ExecutionPlane.HeartbeatMetadata](ExecutionPlane.HeartbeatMetadata.md): Heartbeat metadata linked to workflow activity and lease evidence.
- [ExecutionPlane.Kernel](ExecutionPlane.Kernel.md): Minimal execution kernel for contract validation, dispatch, timeout
coordination, and raw-fact emission.

- [ExecutionPlane.Kernel.DispatchPlan](ExecutionPlane.Kernel.DispatchPlan.md): Minimal Wave 1 dispatch plan produced from a validated route and lower intent.

- [ExecutionPlane.Kernel.ExecutionResult](ExecutionPlane.Kernel.ExecutionResult.md): Result bundle returned by the minimal execution-plane kernel.

- [ExecutionPlane.Lane.Adapter](ExecutionPlane.Lane.Adapter.md): Transport lane adapter behaviour.
- [ExecutionPlane.Lane.Capabilities](ExecutionPlane.Lane.Capabilities.md): Lane adapter capability descriptor.
- [ExecutionPlane.Lanes.DiagnosticLane](ExecutionPlane.Lanes.DiagnosticLane.md): Bounded, non-coding diagnostic lane adapter.
- [ExecutionPlane.LowerSimulation](ExecutionPlane.LowerSimulation.md): Route-configured lower-runtime simulation support.
- [ExecutionPlane.Placement.Surface](ExecutionPlane.Placement.Surface.md): Lane-neutral placement surface contract.
- [ExecutionPlane.Placements.Capabilities](ExecutionPlane.Placements.Capabilities.md): Narrow placement-surface capabilities carried independently from command or
provider semantics.

- [ExecutionPlane.Placements.Guest](ExecutionPlane.Placements.Guest.md): Guest-backed placement semantics for the execution-plane substrate.

- [ExecutionPlane.Placements.Local](ExecutionPlane.Placements.Local.md): Same-node placement semantics for the execution-plane substrate.

- [ExecutionPlane.Placements.SSH](ExecutionPlane.Placements.SSH.md): SSH-backed placement semantics for the execution-plane substrate.

- [ExecutionPlane.Placements.Surface](ExecutionPlane.Placements.Surface.md): Narrow execution-surface contract for process placement and runtime routing.

- [ExecutionPlane.Provenance](ExecutionPlane.Provenance.md): Execution provenance for governed node admission and direct lower-lane owners.

- [ExecutionPlane.RemoteFacade.Lane](ExecutionPlane.RemoteFacade.Lane.md): Execution Plane-owned lower lane facade for distributed StackLab profiles.
- [ExecutionPlane.Runtime.Client](ExecutionPlane.Runtime.Client.md): Consumer-to-node admitted interactive lifecycle.
- [ExecutionPlane.Runtime.Constraint](ExecutionPlane.Runtime.Constraint.md): Serializable runtime constraint.
- [ExecutionPlane.Runtime.Error](ExecutionPlane.Runtime.Error.md): Bounded Runtime Client error envelope.
- [ExecutionPlane.Runtime.Event](ExecutionPlane.Runtime.Event.md): Ordered incremental event emitted after Runtime Client subscription.
- [ExecutionPlane.Runtime.Lifecycle](ExecutionPlane.Runtime.Lifecycle.md): Pure lifecycle validation shared by Runtime Client implementations.
- [ExecutionPlane.Runtime.NodeDescriptor](ExecutionPlane.Runtime.NodeDescriptor.md): Runtime client descriptor returned by describe/1.
- [ExecutionPlane.Runtime.Status](ExecutionPlane.Runtime.Status.md): Serializable Runtime Client lifecycle status.
- [ExecutionPlane.RuntimeEvidenceRef](ExecutionPlane.RuntimeEvidenceRef.md): Public-safe reference to raw runtime evidence.
- [ExecutionPlane.Sandbox.AcceptableAttestation](ExecutionPlane.Sandbox.AcceptableAttestation.md): Closed set of acceptable Target attestation classes for one admission request.

- [ExecutionPlane.Sandbox.Profile](ExecutionPlane.Sandbox.Profile.md): Opaque signed governance bundle authored upstream.

- [ExecutionPlane.StreamLeaseContract](ExecutionPlane.StreamLeaseContract.md): Stream lease and revocation metadata contract.
- [ExecutionPlane.Target.Attestation](ExecutionPlane.Target.Attestation.md): Raw Target attestation evidence presented before routing-table admission.
- [ExecutionPlane.Target.Client](ExecutionPlane.Target.Client.md): Node-to-Target execution client behaviour.
- [ExecutionPlane.Target.Descriptor](ExecutionPlane.Target.Descriptor.md): Verifier-validated Target routing descriptor.
- [ExecutionPlane.Target.Verifier](ExecutionPlane.Target.Verifier.md): Target attestation verifier behaviour.
- [ExecutionPlane.Testkit.ContractFixtures](ExecutionPlane.Testkit.ContractFixtures.md): Wave 1 fixtures for the frozen contract packet.