reuse-surface/registry/capabilities/capability.wiki.coordination-journal.md

id, name, summary, owner, status, domain, tags, maturity, external_evidence, discovery, availability, relations, evidence, consumer_guidance

id	name	summary	owner	status	domain	tags	maturity	external_evidence	discovery	availability	relations	evidence	consumer_guidance
capability.wiki.coordination-journal	Event-Sourced Coordination Journal	An append-only, totally-ordered-per-space decision log (overlays, bindings, aliases, merges, forks) whose current state is a derived fold; git-addressable history.	shard-wiki	draft	helix_forge	wiki event-sourcing coordination git journal shard-wiki	discovery availability current target confidence rationale D5 D6 high Keystone resolved across two architecture reviews: coordination-canonical state as an append-only decision log with a per-space append authority; current state is a derived fold (derived = f(log)). current target confidence rationale A2 A4 medium In-memory DecisionLog + fold work as a source module; the git-backed store with a per-space lease (the production backing) is planned.	completeness reliability level name confidence basis satisfied_expectations broken_expectations out_of_scope_expectations C2 Partial medium scope_vs_intent_and_consumer_expectations append-only, totally-ordered-per-space log with read-your-writes derived fold to aliases + transitively-merged equivalence groups git-backed storage and per-space lease/append-authority not yet implemented general-purpose event bus level confidence basis known_reliability_risks R1 low consumer_quality_signals in-memory backing only; cross-process durability pending	intent includes excludes use_cases Make coordination-canonical decisions durable and git-addressable as events, with the queryable current state always recomputable by replay. append-only decision log, totally ordered per information space derived fold to current coordination state (aliases, equivalence groups, overlays) per-space append authority (concurrency model) storing derived/disposable union state shard-wiki UseCaseCatalog UC-29, UC-33 (history, attribution, coordination journal)	current_level target_level current_artifacts target_artifacts consumption_modes A2 A4 shard-wiki/src/shard_wiki/coordination/decision_log.py git-backed log store with per-space lease source module	supports capability.wiki.shard-orchestration capability.wiki.overlay	documentation tests shard-wiki/spec/CoreArchitectureBlueprint.md (Section 8.1) shard-wiki/tests/test_decision_log.py	recommended_for not_recommended_for known_limitations durable, replayable, git-addressable coordination state for a federated space high-frequency general event streaming production git backing + lease are still on the roadmap (SHARD-WP-0009)

Event-Sourced Coordination Journal

The keystone: coordination-canonical state (overlays, equivalence bindings, aliases, merges, forks) is an append-only decision log, totally ordered per information space; the queryable current state is a derived fold of the log (derived = f(log)). The log is git-addressable, giving history/patch/review/backup for coordination decisions for free.

Assessment notes

Discovery

Resolved across the round-1/round-2 architecture reviews (CoreArchitectureBlueprint Section 8.1).

Availability

decision_log.py ships an in-memory, totally-ordered log + fold; git+lease backing is planned.