Project Context Runtime

Project Context Runtime

Shared library providing the durable identity, producer-result, semantic-index reference, and deterministic manifest records used by every project-context refresh caller (architecture refresh, the refresh orchestrator, branch-local checkpoints, and main convergence).

This is an infrastructure skill — not user-invocable. Import from <skill-base-dir>/scripts/ after resolving this loaded skill directory, or add scripts/ to sys.path and import the bare module names.

What it owns

• scripts/models.py — strict, versioned dataclasses, enums, typed fail-closed exceptions, deterministic operation-identity derivation, and offline JSON-Schema validation.
• scripts/atomic.py — crash-safe atomic JSON writes (same-directory temp file, fsync, atomic replace, parent fsync) and cross-process advisory file locking. Private runtime-core; not part of the supported facade.
• scripts/store.py — the OperationStore, a Git-common-dir–backed durable ledger with per-operation locking and a validated state machine.
• scripts/manifest.py — deterministic, byte-stable manifest projection and an atomic committable writer.
• install_assets/openspec/schemas/*.schema.json — the three versioned Draft 2020-12 contracts (types, operation, manifest).

Supported facade

from scripts import (
    OperationStore,      # durable create/resume/transition
    write_manifest,      # deterministic committable projection
    OperationRecord, RefreshManifest, ProducerResult,
    derive_operation_id,
)

Boundaries

• Records are durable per clone: the store shares state across linked worktrees and later processes, not across machines.
• The mutable operation.json ledger is never committed; only the deterministic manifest projection is a repository artifact.
• Unknown schema versions, malformed records, unsafe paths, duplicate producer identities, and illegal transitions fail closed and are never coerced into a fresh-looking record.
• Semantic-index state is an opaque external reference; any status other than succeeded (with indexed_revision == requested_revision) requires an explicit fallback.

See docs/project-context-refresh.md for the full consumer contract.