| name | memory-management |
| plugin | memory-management |
| description | Tiered memory system for cognitive continuity across agent sessions. Manages hot cache (session context loaded at boot) and deep storage (loaded on demand). Use when: (1) starting a session and loading context, (2) deciding what to remember vs forget, (3) promoting/demoting knowledge between tiers, (4) user says 'remember this' or asks about project history. |
| allowed-tools | Read, Write |
Memory Management
Tiered memory system that makes an AI agent a continuous collaborator across sessions.
Architecture
The memory system has six tiers, configurable per project:
Tier 1: HOT CACHE (always loaded at boot -- ~200 lines target)
+-- <primer_file> Role, identity, constraints
+-- <boot_digest_file> Tactical status, active tasks
+-- <boot_contract_file> Immutable constraints
+-- <snapshot_file> Cognitive Hologram (1 sentence per file)
Tier 2: RLM SUMMARY LEDGER (fast keyword lookup -- loaded on demand)
+-- <summary_cache_file> Pre-generated text summaries: docs, protocols, research
Plugin: rlm-factory | Skill: rlm-search | Profile: project
+-- <tool_cache_file> Pre-generated text summaries: plugins, skills, scripts
Plugin: rlm-factory | Skill: rlm-search | Profile: tools
Tier 3: VECTOR STORE (semantic embedding search -- loaded on demand)
+-- <vector_db_backend> ChromaDB via vector-db plugin / vector-db-agent skill
Profile: knowledge | Port: configured in vector_profiles.json
Tier 4: DEEP STORAGE (filesystem -- authoritative source, loaded on demand)
+-- <domain_data_dir>/ Research topics: {topic}/analysis.md
+-- <design_docs_dir>/ ADRs, RFCs
+-- <governance_dir>/ Protocols, playbooks
Tier 5: VAULT (Obsidian -- linked knowledge graph, loaded on demand)
+-- <vault_dir>/ Plugin: obsidian-wiki-engine
Skills: obsidian-vault-crud, obsidian-canvas-architect,
obsidian-graph-traversal, obsidian-bases-manager,
obsidian-wiki-builder, obsidian-query-agent,
obsidian-rlm-distiller, obsidian-wiki-linter
Env: VAULT_PATH or OBSIDIAN_VAULT_PATH
Tier 6: SOUL (external persistence -- optional, synced at session seal)
+-- <traces_file> Plugin: project-specific (e.g. huggingface-utils)
e.g. lineage/, data/, soul_traces.jsonl on HF Hub
Projects define their own file paths for each slot. Tiers may be omitted or added based on project complexity.
Lookup Flow (3-Phase Search Protocol)
When searching for information, ALWAYS escalate in order. Never skip ahead.
Query arrives ->
1. HOT CACHE Instant. Boot files cover ~90% of context needs.
2. DEEP STORAGE (topic/decision) Load specific domain dir or design doc by subject.
3. RLM SUMMARY LEDGER (Phase 1) Keyword search via rlm-factory:rlm-search skill.
4. VECTOR STORE (Phase 2) Semantic search via vector-db:vector-db-search skill.
5. GREP / EXACT SEARCH (Phase 3) rg/grep scoped to paths from Steps 3 or 4.
6. Ask user Unknown? Learn it and persist it.
Phase 1 -- RLM Summary Scan (Table of Contents)
RLM is amortized prework: each file read ONCE, summarized ONCE, cached as plain text JSON.
Searching summaries is O(1) keyword lookup -- no embeddings, no inference.
Trigger the rlm-factory:rlm-search skill, providing the profile and search term.
Use Phase 1 when: You need to understand what a file does, find which file owns a feature,
or navigate the codebase without reading individual files.
Escalate to Phase 2 when: The summary is insufficient or no match found.
Phase 2 -- Vector Store Semantic Search (Back-of-Book Index)
Embedding-based nearest-neighbor search across all indexed chunks. Returns ranked
parent chunks with RLM Super-RAG context pre-injected.
Trigger the vector-db:vector-db-search skill, providing the query, profile, and limit.
Use Phase 2 when: You need specific code snippets, patterns, or implementations.
Escalate to Phase 3 when: You have a file path (from Phase 1 or 2) and need an exact line.
Phase 3 -- Grep / Exact Search (Ctrl+F)
Precise keyword or regex match. Always scope to paths discovered in earlier phases.
grep_search "VectorDBOperations" ../../skills/
rg "def query" ../../ --type py
Anti-patterns: Never run a full-repo grep without scoping. Never skip Phase 1.
Dependencies
rlm-factory -- RLM Summary Ledger (Tier 2)
| Component | Value |
|---|
| Plugin | .agents/skills/ (rlm-curator, rlm-search, rlm-init, rlm-distill-agent) |
| Skill (write) | skills/rlm-curator/ -- distill, inject, audit, cleanup |
| Skill (read) | skills/rlm-search/ -- query the ledger |
| Skill (Phase 1 search) | rlm-factory:rlm-search |
| Skill (write/inject) | rlm-factory:rlm-curator |
| Skill (audit coverage) | rlm-factory:rlm-curator |
| Skill (shared config) | rlm-factory:rlm-curator |
| Cache files | .agent/learning/rlm_summary_cache.json (docs), .agent/learning/rlm_tool_cache.json (tools) |
vector-db -- Vector Store (Tier 3)
| Component | Value |
|---|
| Plugin | .agents/skills/ (vector-db-search, vector-db-ingest, vector-db-launch, vector-db-init) |
| Skill | skills/vector-db-agent/ -- ingest, query, operations |
| Skill (Phase 2 search) | vector-db:vector-db-search |
| Skill (ingest files) | vector-db:vector-db-ingest |
| Skill (operations) | vector-db:vector-db-search |
| Skill (config) | vector-db:vector-db-search |
| Backend | ChromaDB (chromadb.HttpClient with PersistentClient fallback) |
obsidian-wiki-engine -- Linked Vault + LLM Wiki (Tier 5)
| Component | Value |
|---|
| Plugin | .agents/skills/ (obsidian-vault-crud, obsidian-init, obsidian-wiki-builder, obsidian-query-agent, obsidian-rlm-distiller, obsidian-wiki-linter, obsidian-canvas-architect, obsidian-graph-traversal) |
| Skill: vault setup | obsidian-wiki-engine:obsidian-init -- prerequisites, .obsidian/ config, exclusion filters |
| Skill: read/write notes | obsidian-wiki-engine:obsidian-vault-crud -- atomic create/read/update/append |
| Skill: build wiki nodes | obsidian-wiki-engine:obsidian-wiki-builder -- Karpathy-style concept nodes |
| Skill: query wiki | obsidian-wiki-engine:obsidian-query-agent -- 3-phase RLM+vector+grep search |
| Skill: distill RLM | obsidian-wiki-engine:obsidian-rlm-distiller -- generates RLM summary layers |
| Skill: semantic lint | obsidian-wiki-engine:obsidian-wiki-linter -- inconsistencies, gaps, stale articles |
| Config | .agent/learning/rlm_wiki_raw_sources_manifest.json (sources), .agent/learning/vector_profiles.json (wiki profile) |
| Requires | pip:ruamel.yaml (lossless YAML frontmatter), Obsidian Desktop |
| Env | VAULT_PATH -- absolute path to the vault root |
Promotion / Demotion Rules
Promote to Hot Cache when:
- Knowledge is referenced in 3+ consecutive sessions
- It's critical for active work (current spec, active protocol)
- It's a constraint or identity anchor
Demote to Deep Storage when:
- Spec/feature is completed and merged
- Governing document is superseded by newer version
- Topic research is concluded
- Technical decision is ratified (move from draft to archive)
What Goes Where
| Type | Hot Cache | On-Demand Tier |
|---|
| Active tasks | Boot digest | -- |
| Identity/role | Primer file | -- |
| Constraints | Boot contract | -- |
| Session state | Snapshot file | Tier 6 Soul (traces) |
| Research topics | Summary in snapshot | Tier 4: domain_data_dir/{name}/ |
| Design decisions | Referenced by ID | Tier 4: design_docs_dir/{id}_{name}.md |
| Governing docs | Referenced by ID | Tier 4: governance_dir/{id}_{name}.md |
| Plugins/scripts/tools | -- | Tier 2: RLM Summary Ledger (tool cache) |
| Docs/protocols/research | -- | Tier 2: RLM Summary Ledger (summary cache) |
| System docs | -- | Tier 2 RLM + Tier 3 Vector Store |
| Linked notes, canvases | -- | Tier 5: Vault (Obsidian) |
| External persistence | -- | Tier 6: Soul (HuggingFace or equivalent) |
Session Memory Workflow
At Session Start (Boot)
- Load hot cache files in order (primer -> contract -> digest -> snapshot)
- Integrity check validates snapshot is current
- If snapshot stale -> flag for refresh at session end
During Session
- New learning -> Write to
<domain_data_dir>/{topic}/
- New decision -> Create design document draft
- New tool -> Register in tool inventory
- Correction -> Update relevant file + note in disputes log if contradicting
At Session End (Seal)
- Update snapshot file with new content learned this session
- Seal validates no drift since last audit
- Persist traces to external storage (if configured)
Conventions
- Hot cache target: ~200 lines total across all boot files
- Snapshot: 1 sentence per file, machine-readable
- Topic folders:
lowercase-hyphens/
- Document numbering: 3-digit, sequential
- Always capture corrections and contradictions in a disputes log
Configuration
Projects configure the memory system by setting file paths in their project-specific plugin:
| Variable | Purpose |
|---|
MEMORY_PRIMER_FILE | Path to cognitive primer / role definition |
MEMORY_BOOT_DIGEST | Path to tactical boot digest |
MEMORY_BOOT_CONTRACT | Path to immutable constraints |
MEMORY_SNAPSHOT_FILE | Path to learning snapshot (hologram) |
MEMORY_DOMAIN_DIR | Directory for domain research |
MEMORY_DESIGN_DIR | Directory for design docs (e.g. ADRs) |
MEMORY_GOVERNANCE_DIR | Directory for governing docs (e.g. Protocols) |
Architecture Diagrams
