Membank

LLM memory management system. Stores your corrections, preferences, decisions, and learnings in a local SQLite database, queryable via semantic search. Exposed as an MCP server so any MCP-compatible LLM harness (Claude Code, Cursor, etc.) can read and write memories automatically.

How it works

• Memories are typed (correction > preference > decision > learning > fact) and scoped (global or per-project)
• Embeddings run locally via bge-small-en-v1.5 — no data leaves your machine
• Dedup via cosine similarity: >0.92 = auto-overwrite, 0.75–0.92 = flagged for review
• Project scope derived from git remote get-url origin hash, fallback to cwd hash
• Session injection: stats + all pinned global memories + all pinned project memories prepended to every context window
• Optional background synthesis engine compresses memories into a rolling summary, replacing pinned memory injection when enabled

Requirements

• Node.js ≥ 24
• pnpm ≥ 10

Quick start

npx @membank/cli setup

setup auto-detects your installed LLM harness and writes the MCP server config and injection hooks. Use --harness <name> to target a specific harness, --yes to skip prompts, --json for machine-readable output.

Supported harnesses: claude-code, copilot, codex, opencode.

After setup, restart your harness. Membank will start injecting memories into every session.

CLI

membank query "preferred test framework"   # semantic search
membank add --type <type> <content>        # save a new memory
membank list                               # list all memories
membank pin <id>                           # pin (always injected)
membank unpin <id>
membank delete <id>
membank review                             # list memories flagged for dedup review
membank review --resolve <id>             # dismiss review events for a memory
membank stats                              # storage and usage stats
membank export                             # export to JSON file (--output <path> to specify)
membank import <file>                      # import from JSON export file
membank migrate list                       # list available data migrations
membank migrate run <name>                 # run a named migration
membank activity                           # list activity events for the current project
membank dashboard                          # (deprecated) use: npx @membank/dashboard
membank config get <key>                   # print a config value
membank config set <key> <value>           # set a config value
membank config show                        # print the full config
membank synthesize run                     # trigger a synthesis run for a scope
membank synthesize show                    # display current synthesis for a scope
membank synthesize show --version <n>      # show a specific archived synthesis version
membank synthesize status                  # show all scopes with synthesis status
membank synthesize history                 # list archived synthesis versions for a scope
membank synthesize diff <v1> <v2>          # line diff between two archived synthesis versions
membank synthesize revert <version>        # revert active synthesis to a previous version
membank memory history <id>               # list version history for a memory
membank memory show <id>                   # show memory content at current or specific version
membank memory diff <id> <v1> <v2>         # line diff between two memory versions
membank memory revert <id> <version>       # revert a memory to a previous version
membank projects list                      # list all projects with origin and memory count
membank projects reconcile                 # merge orphaned worktree project into its parent
membank setup                              # configure MCP server + injection hooks
membank setup upgrade                      # migrate harness configs to standalone membank-mcp
membank inject                             # output session context (called by hooks)
membank inject --harness claude-code       # format output for a specific harness

Injection hooks

setup configures MCP servers and injection hooks for all supported harnesses. Hooks fire at session start, on each user prompt, and at session end to keep pinned memories (or synthesis) in context throughout the session.

Supported harnesses and their hook mechanisms:

Harness	MCP config location	Session hooks
claude-code	Managed by claude mcp	SessionStart, SessionEnd
copilot	~/.copilot/mcp-config.json	MCP server only (hooks not supported)
codex	Managed by codex mcp	SessionStart, UserPromptSubmit
opencode	~/.config/opencode/opencode.json	experimental.chat.system.transform plugin

Web dashboard

Access memories via a local web UI with browsing, searching, filtering, and editing:

npx @membank/dashboard
# Opens http://localhost:3847

Features:

• Browse all memories with filtering by type, scope, and pin status
• Full-text search across memory content
• Edit memory type, tags, and metadata
• Review memories flagged for deduplication
• View memory statistics and storage overview
• Dark mode support

See packages/dashboard/README.md for API docs and architecture details.

MCP tools

When running as an MCP server, the following tools are exposed to the LLM:

Tool	Description
query_memory	Semantic search across stored memories. scope controls whether to search this project, global, or all projects.
save_memory	Store a new memory with type, tags, and scope. scope can target this project, global, or a named tool/skill.
update_memory	Update content, type (reclassification), or tags on an existing memory
delete_memory	Remove a memory by ID
delete_many	Delete multiple memories in one call; returns per-id status
pin_memory	Pin a memory so it is always injected into session context
unpin_memory	Unpin a memory to remove it from guaranteed session injection
get_memory_summary	Aggregate stats: total memories, counts by type, pinned count, review queue size
list_flagged_memories	List memories with unresolved dedup review events (similarity 0.75–0.92)
resolve_review	Dismiss all open review events for a memory after reviewing it
resolve_many	Resolve review events for multiple memories in one call; returns per-id status
merge_memories	Merge two or more near-duplicate memories into one, combining their content
list_memory_history	List version history for a memory (up to 10 past snapshots)
list_migrations	List available named data migrations
run_migration	Execute a named data migration
list_synthesis_history	List archived synthesis versions for a scope (up to 5 snapshots)
list_projects	List all projects with origin, memory count, and scope hash
reconcile_project	Merge one project into another; auto-detects the orphan for the current worktree when IDs are omitted

Memory synthesis (optional)

The synthesis engine runs in the background and compresses memories into a rolling summary per scope. When a synthesis is available, it replaces pinned memory injection in the session context.

Synthesis calls Claude Haiku via your locally installed claude CLI. Any of the following auth methods work:

• claude auth login — uses your existing Claude Code session (Pro/Max subscribers)
• CLAUDE_CODE_OAUTH_TOKEN — run claude setup-token to generate one
• ANTHROPIC_API_KEY — direct API billing via Anthropic Console

Enable by creating ~/.membank/config.json:

{
  "synthesis": {
    "enabled": true
  }
}

View synthesis state via:

membank synthesize run               # trigger synthesis for a scope
membank synthesize show              # current synthesis for global scope
membank synthesize show --scope <s>  # synthesis for a specific project scope
membank synthesize status            # all scopes and their synthesis state
membank synthesize history           # list archived synthesis versions
membank synthesize diff <v1> <v2>    # line diff between two archived versions
membank synthesize revert <version>  # revert active synthesis to a previous version

Storage

All data lives at ~/.membank/:

~/.membank/
  memory.db        # SQLite database (memories + vectors + synthesis)
  models/          # cached embedding model (~30 MB, downloaded on first run)
  config.json      # optional config (synthesis settings, etc.)

Packages

Package	Description
@membank/core	DB, embeddings, query engine, dedup logic
@membank/mcp	stdio MCP server
@membank/cli	CLI and npx entrypoint
@membank/dashboard	Web UI — browse, search, and manage memories

Development

pnpm install                # install workspace deps
pnpm build                  # build all packages in dependency order
pnpm dev                    # watch mode across all packages (including dashboard dev server)
pnpm typecheck              # tsc --noEmit across all packages
pnpm lint                   # biome check
pnpm lint:fix               # biome check --write
pnpm clean                  # remove all dist/ and *.tsbuildinfo

Scoped to one package:

pnpm --filter @membank/core build
pnpm --filter @membank/cli dev
pnpm --filter @membank/dashboard dev    # dashboard only on http://localhost:3847

License

MIT — see LICENSE.