qwexs/engram

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# Engram **[English](README.md)** · **[Русский](README.ru.md)** **Durable memory for long-lived agents — captured after the turn, isolated by scope, and backed by receipts.** Engram is an [OpenClaw](https://github.com/openclaw/openclaw) memory system for personal agents, project chats, and agent teams. Its current architecture is built around **Memory Worker**: a post-turn pipeline that turns completed conversations into compact operational memory without asking the foreground agent to remember to write it down. - automatic episodic capture for Events and Decisions; - exact workspace/session isolation; - crash-safe queues, immutable observations, and read-back receipts; - Knowledge Graph v3 for explicit durable assertions; - hybrid retrieval through QMD (BM25 + embeddings + rerank); - domain memory for projects, topics, groups, and subagents. **MIT · OpenClaw · v3.6.5** --- ## Why Engram exists Agents lose continuity on `/new`, after compaction, and across ephemeral workers. Loading full chat history postpones the problem: token cost grows, signal quality falls, and private contexts become hard to separate. Engram keeps the active prompt small while preserving a searchable, scoped history. | Problem | Without Engram | With Engram | |---|---|---| | A new session starts cold | Re-read or paste old chats | Retrieve compact daily/domain memory | | The agent forgets to record a result | Important context disappears | Memory Worker evaluates completed turns | | Memory becomes a text dump | Low precision and growing token cost | Typed capture, receipts, and hybrid search | | Project contexts bleed together | Accidental cross-project recall | Exact session and collection boundaries | | Background processing partially fails | Silent gaps or duplicates | Durable queues, idempotent effects, explicit health | --- ## The current architecture Engram separates **operational memory**, **durable knowledge**, and **retrieval**. They are connected, but they do not share write authority. ![Memory Worker architecture: operational memory and durable knowledge use separate write paths](assets/readme/engram-memory-worker-architecture.webp) The important boundary is intentional: - **Memory Worker records what happened.** It owns operational Events and Decisions only for explicitly activated scopes. - **KG v3 records what must remain a durable current assertion.** It accepts only explicit, authorized typed writes from the source turn. - **QMD is a derived retrieval layer.** It indexes canonical memory but never becomes the source of truth. - **Heartbeat maintains the workspace.** After the KG v3 cutover it no longer classifies daily notes or promotes them into the graph. Automatic observation-to-KG promotion is retired. A model noticing something in a conversation is not enough to mutate durable knowledge. --- ## Memory Worker Memory Worker is the default capture path for activated personal and project contours. ### 1. Capture the completed turn The OpenClaw integration correlates trusted message, persisted-turn, run, and completion identities. It commits a checkpoint before evaluation, stores only bounded evidence, redacts credentials, and rejects raw tool outcomes, media, and attachments. The crash guarantee begins once the first checkpoint is durably written. A host failure before hook invocation remains outside the Engram boundary and is never silently described as recovered. ### 2. Evaluate the episode The worker uses a sealed, tool-free evaluator. It produces a bounded set of compact `events` or `decisions` assertions plus an explicit disposition for every admitted source: `asserted`, `supports`, `duplicate`, `skip`, or `unresolved`. The contextual v2 evaluator can join a bounded local episode, distinguish actors, and preserve status such as `requested`, `decided`, `reported_done`, `accepted`, or `failed`. Exact source spans remain attached to the observation; confidence cannot override scope or authority checks. ### 3. Apply with proof A separate deterministic consumer writes the admitted entry to the correct daily note. Every write has: - an opaque Markdown anchor; - an immutable apply receipt; - exact source, scope, producer, and policy provenance; - destination read-back before completion; - idempotent crash recovery. For topic workspaces, a second receipt-joined consumer projects verified entries into the domain changelog and recent status. It does not re-run a model or invent a second source of truth. ### 4. Hand off to retrieval After the canonical write, Engram emits a content-free QMD dirty-generation handoff. The global coordinator performs `update` and incremental `embed`, then seals `canonical_indexed` only after exact collection, document, anchor, digest, and physical-index read-back. Retrieval and utilization receipts are deliberately not claimed without host-owned evidence. Engram distinguishes **captured**, **applied**, **indexed**, **retrieved**, and **used** instead of collapsing them into one optimistic “success”. ### Ownership is explicit Memory Worker activates through a digest-pinned rollout projection. Until the projection is valid, enabled, in scope, and past its activation boundary, foreground capture remains authoritative. Once ownership transfers, foreground Events/Decisions writes are rejected to prevent duplicates. The same rule applies to a bounded agent family: every admitted source and write still retains its exact runtime-session scope. --- ## Knowledge Graph v3 KG v3 is the durable assertion layer, not a summary of everything the worker observed. - Writes use `engram_memory_save` or `engram_memory_retract` inside an authorized source turn. - Entity and predicate registries fail closed. - One source turn may perform at most one typed mutation. - Assertions are append-only and provenance-bound. - Corrections create an explicit replacement/supersession chain; historical records are preserved. - The legacy v2 `items.json` store is immutable and has no fallback writer. Actual use can be recorded separately through `engram_memory_access`. A daily coordinator reconciles those events into an access-state overlay and rebuilds the decay-aware `life/v3/current-summary.md` projection without mutating canonical assertion bodies. | Tier | Recency | Current summary | Searchable | |---|---:|---|---| | **Hot** | ≤ 7 days | prominent | yes | | **Warm** | 8–30 days | lower priority | yes | | **Cold** | 30+ days | omitted | yes through QMD | --- ## Domains and team memory Domains give ephemeral workers and long-running chats a persistent, bounded context. ![Domain registry: every session resolves to one bounded domain](assets/readme/engram-domain-addresses.webp) | Domain type | Binding | Typical use | |---|---|---| | `topic-thread` | forum topic | project channel with curated memory | | `peer-direct` | DM | private 1:1 contour | | `group-direct` | group | shared group contour | | `dev-project` | KG entity | engineering work and spawned subagents | | `cron-task` | schedule | background workers with durable state | Topic domains keep `decisions.md`, `status.md`, and `changelog.md`. Domain context is injected at bootstrap; it is not copied into every prompt or exposed to sibling projects. For an already enrolled project workspace, creating a topic domain is one resumable operation: registry entry, host route, exact QMD collections, and Memory Worker binding are verified together. --- ## Reliability and safety properties ![Crash-safe delivery: every durable transition from a completed turn to the QMD index is backed by a checkpoint or receipt](assets/readme/engram-crash-safe-pipeline.webp) Engram treats memory as a sequence of verifiable transitions, not one optimistic background task. A completed turn becomes recoverable after its durable checkpoint; canonical application and indexing complete only after their own receipt and exact read-back. | Property | How Engram enforces it | |---|---| | **No duplicate capture** | explicit ownership transfer + idempotent operation identities | | **No cross-scope fallback** | exact workspace/session bindings and exact QMD collection resolution | | **Crash recovery** | durable checkpoints, queues, leases, immutable receipts, destination read-back | | **Bounded evidence** | redaction, size limits, TTLs, and no raw tool/media ingestion | | **No silent KG promotion** | separate typed KG v3 authority; observer has no KG mutation capability | | **Partial-failure visibility** | per-workspace accounting and fleet health; cron `ok` is not treated as semantic success | | **Safe rollback** | projections can be disabled while queues, receipts, and canonical data remain intact | Retention is bounded by artifact class: raw evidence is short-lived; content-free provenance and receipts live longer so applied memory can still be audited after evidence expires. --- ## Supporting services ### QMD QMD provides scoped hybrid search: - BM25 for exact terms; - embeddings for semantic similarity; - reranking for final relevance; - one coordinated physical index across many logical collections. Every agent-facing search requires at least one explicit `-c <collection>`. Collection ownership and readable scope are validated before execution. ```bash bun bin/engram --workspace /path/to/workspace \ qmd query "search text" -c workspace-memory -c workspace-life ``` Public `engram qmd update/embed` and generic passthrough are intentionally absent. Index maintenance belongs to the coordinator. ### Heartbeat Heartbeat is now a deterministic maintenance runner. It handles locks, daily-note rotation and watermarks, domain maintenance, validation, and reporting. KG extraction and automatic promotion are retired; QMD maintenance may be delegated to the global coordinator. ### Operational Learning Loop OLL observes authorized friction, correction, preference, workflow, and quality signals. A separate nightly coordinator performs reconciliation and bounded adaptation. Rules are scoped, receipt-backed, rollback-capable, and injected only when an active projection matches the current context. Memory-derived rule materialization is a separate gated surface; ordinary Memory Worker output does not automatically become an instruction. --- ## Quick start Requirements: - [OpenClaw](https://github.com/openclaw/openclaw); - [Bun](https://bun.sh) ≥ 1.3 and < 2; - QMD in local or cloud-backed mode. Initialize a workspace: ```bash # Install the hybrid-search engine bun skills/engram/scripts/install-qmd.js # Preview first bun skills/engram/scripts/init.js \ --workspace /path/to/workspace \ --agent-id main \ --qmd-variant auto \ --with-cron \ --dry-run # Apply after review bun skills/engram/scripts/init.js \ --workspace /path/to/workspace \ --agent-id main \ --qmd-variant auto \ --with-cron ``` The init command creates the workspace memory structure, installs the managed hook set, restarts the gateway when required, validates hook read-back, and can provision a disabled-first maintenance cron. **Memory Worker activation is intentionally separate.** Init does not invent fleet membership, source scopes, model authority, QMD bindings, or an operator-approved activation boundary. Use the reviewed rollout tooling and deployment runbook for your environment, then verify the installed plugin digest, projection, scheduler, canonical receipt/read-back, and a real scoped QMD retrieval. Audit a workspace without applying fixes: ```bash bun skills/engram/scripts/watchdog.js \ --workspace /path/to/workspace \ --json ``` Do not treat scaffolding, an empty worker pass, or scheduler `ok` as end-to-end proof. --- ## Documentation | Topic | Document | |---|---| | Canonical agent protocol | [`SKILL.md`](SKILL.md) | | Memory Worker implementation and guarantees | [`src/memory-observation/README.md`](src/memory-observation/README.md) | | Contextual Memory Worker v2 | [`contracts/memory-observation/v2/README.md`](contracts/memory-observation/v2/README.md) | | Memory observation authority contracts | [`contracts/memory-observation/v1/README.md`](contracts/memory-observation/v1/README.md) | | Source debt and verified effect closure | [`references/memory-source-debt.md`](references/memory-source-debt.md) | | Explicit recovery and plugin-release operators | [`references/memory-recovery-operators.md`](references/memory-recovery-operators.md) | | Runtime durability, topic lineage and bounded context | [`references/memory-runtime-lineage.md`](references/memory-runtime-lineage.md) | | Fleet execution and historical completeness reporting | [`references/memory-fleet-isolation.md`](references/memory-fleet-isolation.md) | | Architecture | [`references/architecture.md`](references/architecture.md) | | Setup | [`references/setup.md`](references/setup.md) | | Workspace watchdog | [`references/watchdog.md`](references/watchdog.md) | | QMD coordinator | [`references/qmd-global-maintenance.md`](references/qmd-global-maintenance.md) | | Topic domains | [`references/topic-thread.md`](references/topic-thread.md) | | Domain/subagent memory | [`references/subagent-memory.md`](references/subagent-memory.md) | | KG v3 decay and current projection | [`references/decay-rules.md`](references/decay-rules.md) | | OLL | [`references/oll.md`](references/oll.md) | | Changelog | [`CHANGELOG.md`](CHANGELOG.md) | ## License [MIT](LICENSE)

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2026-10-29

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