Persistent memory for Claude Code. Bring your own database.
Documentation ·
Quick start ·
CLI reference
Every session starts from zero
You spent an hour yesterday explaining why the store uses three adapters, which
approach you already tried and abandoned, and why that one function must not be
touched. Today Claude knows none of it. So you explain it again.
claude-db fixes that, and the other half too. Claude re-derives your codebase
every time, grepping a name and opening files to work out what calls what.
$ claude-db search "why does capture read the transcript"
83cf1246-eb14 decision 2026-08-19 Tested and written up.
…the old defaults prompt was now cut why does capture read the transcript…
88fab24f-5e59 decision 2026-08-19 Finding 4's other half needs checking…
…cannot work: 0.029483 "why does capture read…" <- highly relevant…
You never run that command. Claude gets the same context injected on every
prompt, so it walks in already knowing. Nothing leaves your machine.
Install
npm install -g claude-db
cd your-project
claude-db install --project
Restart Claude Code. That's it: capture and recall are hooks, so they run
without being asked.
--project scopes to one repo instead of every project on the machine. It
writes .claude/settings.local.json and .mcp.json. Add .mcp.json to your
.gitignore, since it holds a machine-specific path.
Map your code
Memory fills itself as you work. The code graph needs one command:
claude-db scan
Claude then gets four modes through MCP: text (a live grep, works with no
scan at all), usages, explain and path. Re-running scan is cheap: it
hashes files and re-parses only what changed.
TypeScript, TSX, JavaScript, Python, Go, Rust and Ruby are parsed properly, and
every other language — Java, C, C++, C#, Swift, Kotlin, PHP, Elixir, shell and
twenty more — is read by pattern, which finds declarations and name-matched
references tagged INFERRED. Nothing else to install either way.
Use another database
SQLite by default, at ~/.claude-memory/memory.db. No setup, no network. Point
it elsewhere to share memory across machines:
claude-db use "mongodb+srv://user:[email protected]/memory"
claude-db use "postgres://user:pass@host:5432/memory"
Install the driver you need (npm install mongodb or pg); neither ships by
default.
With it, and without it
Asking who defines and calls closeObservations by hand means a grep, then
opening three store adapters to see which hits are definitions. One explain
call answers it already classified: 2.1x cheaper, measured across eight
real symbols in this repo.
Recall is the standing cost of ~180 tokens a prompt, skipped entirely on 28% of
prompts because the answer is already in context:
every prompt costs 180 tokens of recall
every lookup refunds 597 tokens (1,115 by hand - 518 with)
so one lookup pays for 3.3 prompts of recall
Check it on your own repo with npm run bench:ab and npm run bench:tokens
from a clone. With and without has every number,
including the symbols where plain grep wins.
Commands
cdb is a shorter alias for all of them. These are the ones you actually type:
| Command |
What it does |
claude-db install [--project] |
Register hooks and the MCP server |
claude-db status |
Is it wired up, and when did it last record anything |
claude-db doctor [--deep] |
Resolved config; --deep proves a full round trip |
claude-db scan [--force] |
Build the code graph for this repo |
claude-db usages [--mode <m>] <symbol> |
What uses a symbol: live git grep, or the code graph |
claude-db use <url> |
Switch database and verify it |
claude-db view |
See this project's memory live in the browser |
Every other command, including search, remember, seed, sync, export,
prune and reset, is in the CLI reference.
Install also adds a /cdb-scan skill: run it once on an existing project and
Claude maps the codebase into memory, so search has something to find before
you have any history.
Requirements
Node 22.5 or newer. That's the only hard requirement: SQLite comes from Node's
builtin node:sqlite, so nothing compiles at install time.
Embeddings run locally with a zero-dependency embedder. For real semantic
search, npm install @xenova/transformers and it upgrades itself.
Privacy
Nothing leaves your machine unless you point it at a remote database.
.env, secrets/, node_modules and .git/ are never stored, text wrapped
in <private>...</private> is stripped, and API keys and tokens are redacted
before anything is written.
Documentation
claude-db.vercel.app/docs has the rest:
the CLI reference,
MCP tools,
how it works,
databases and
troubleshooting.
Benchmarks has every number,
including the symbols where plain grep wins. Releases are in the
changelog.
Development
npm install
npm run build
npm test # 415 checks
npm run lint # house rules: no comments, no any, import extensions
npm run try # simulate a session, touches nothing
npm run format
Releases publish from CI on a version tag:
npm version patch
git push --follow-tags
CONTRIBUTING.md has the conventions, the test setup, and
how to add a language to the code graph. Security reports go through
SECURITY.md, privately.
License
Apache-2.0
claude-db 是一个免费开源的 Claude Code 持久记忆插件，它把数据库存储在本地（默认 SQLite），让 Claude 跨会话记住你的代码库、过往决策和已放弃的方案，而不是每次都从零开始。