openlynx 0.4.0

OpenLynx — persistent semantic memory for Claude Code, Codex CLI and other coding agents. Auto-saves and recalls conversation history across sessions.

lynx-memory

中文 README

Persistent, semantic, long-term memory for Claude Code. Conversations are auto-saved across sessions and the most relevant snippets are injected into context whenever you start a new prompt — no special syntax, no "remember this" phrasing required.

You      : What can I do tomorrow if the weather's nice — maybe walk the dog?
Claude   : Since you've got Dandan (your golden Border Collie) who needs a lot
           of exercise, try a long walk, frisbee, or a bike ride with him
           tagging along… 🐶
            (you never mentioned Dandan or owning a dog — memory recalled it
             from a past chat)

How it works

Three Claude Code hooks + a small Python service:

Hook	What it does
UserPromptSubmit	Embeds your prompt and injects the top-K most similar prior turns. When a turn has a summary, the summary is injected instead of the raw prose.
Stop	Persists the current user/assistant turn into SQLite + Chroma, then spawns a detached background summarizer that calls the configured API (OpenAI, DeepSeek, or Qwen) to extract long-term memories from the turn.
SessionEnd	Calls the configured API to produce a coarse memory summary of the whole session.

Storage:

• SQLite — source of truth for raw turns, per-turn summaries, and session summaries
• Chroma — local vector index over turns + summaries
• Voyage AI (voyage-3) — embeddings
• OpenAI (gpt-4o-mini, default), DeepSeek (deepseek-chat), or Qwen (qwen-turbo) — per-turn and session summarization (any one of OPENAI_API_KEY, DEEPSEEK_API_KEY, QWEN_API_KEY is enough)

Install

pip install openlynx
lynx-memory init

init will:

1. Create the shared OpenLynx home at ~/.openlynx/
2. Prompt for your VOYAGE_API_KEY (get one free at https://www.voyageai.com/)
3. Write the default .env (MIN_SCORE=0.7, SUMMARY_ENABLED=1, SUMMARY_BACKEND=auto) — set OPENAI_API_KEY, DEEPSEEK_API_KEY, or QWEN_API_KEY to enable per-turn summarization (configurable later via the Web UI ⚙ Settings panel)
4. Back up your existing ~/.claude/settings.json and add the three hooks
5. Link shared commands and the OpenLynx skill into supported host directories
6. Print verification steps

If a legacy ~/.claude/lynx-memory/ store exists and ~/.openlynx/ does not, init migrates it to ~/.openlynx/ before installing hooks. If both exist, OpenLynx uses ~/.openlynx/ and leaves the legacy directory untouched.

The shared home is host-neutral:

~/.openlynx/
  .env
  db/
  commands/
  skills/

Claude Code and Codex keep their own hook configuration files, but reusable OpenLynx files are linked from this shared home into host directories such as ~/.claude/commands/, ~/.claude/skills/, ~/.codex/commands/, and ~/.codex/skills/.

Then open a fresh Claude Code session, chat for a few turns, and run:

lynx-memory status

You should see turns and chroma_turns counters going up.

Codex CLI (cross-host memory)

Same memory store, also wired into Codex CLI:

lynx-memory init --target codex   # or --target all to install both

This writes ~/.codex/hooks.json, sets [features] hooks = true in ~/.codex/config.toml, and registers three hooks (UserPromptSubmit → inject, Stop → persist, SessionStart → summarize the previous session since Codex has no SessionEnd event).

Codex's additionalContext field is fully respected, so retrieved memory is injected exactly like in Claude Code. Restart any running codex process for hooks to take effect — they're loaded at session start.

A turn typed in Claude Code can be recalled inside Codex (and vice versa) because both write to the same SQLite + Chroma store at ~/.openlynx/.

CLI

lynx-memory init           Install hooks, slash commands, and skill links
lynx-memory init-project   Create a .lynx-memory/ marker in cwd to enable
                             project-level storage
lynx-memory status         Show data dir, hook registration, DB stats
lynx-memory doctor         Verify Python, deps, API key, settings.json
lynx-memory merge          Merge memory between the project and global stores
                             (--from / --to is project|global, with --dry-run)
lynx-memory delete         Permanently delete memory for a scope
                             (--scope project|global|both, with double confirm)
lynx-memory uninstall      Remove hooks, slash commands, and skill links (keeps your data)

Slash commands

lynx-memory init also installs five global slash commands into ~/.openlynx/commands/ and links them into host command directories such as ~/.claude/commands/ and ~/.codex/commands/:

Command	What it does
/lynx-memory-status	Show current scope (project vs global) with stats for both
/lynx-memory-pull-global	Merge global memory into the current project (global → proj)
/lynx-memory-push-global	Merge current project memory into global (proj → global)
/lynx-memory-delete	Delete memory with mandatory double confirm (DELETE + y)
/lynx-memory-history	Open a local Web UI to browse, search, tag, and delete turns

Each of these runs lynx-memory status / merge --dry-run first and asks for your approval before any write or destructive action.

Skills

lynx-memory init installs the bundled OpenLynx skill into ~/.openlynx/skills/openlynx/ and links it into supported host skill directories such as ~/.claude/skills/openlynx and ~/.codex/skills/openlynx.

Web UI

Type /lynx-memory-history in Claude Code (or run lynx-memory web) to launch a local FastAPI + React UI on 127.0.0.1. The page opens automatically in your browser and lets you:

• Switch between project and global scopes
• Page through every saved turn
• Search by keyword (SQL LIKE) or semantic similarity (Voyage embeddings)
• Tag turns (e.g. #work, #personal) and filter by tag
• Delete a single turn (also clears its embedding from Chroma)
• See the per-turn summary above each turn, with a one-click button to (re)generate it on demand
• Click the ⚙ gear icon (top-right) to open the Settings panel and configure everything in-browser: API keys, summary backend (OpenAI / DeepSeek / Qwen), model, Top-K, min score, and retrieval scope — changes are saved directly to ~/.openlynx/.env

Usage

# default — listens on http://127.0.0.1:9527 and opens your browser
lynx-memory web

# pick a different port
lynx-memory web --port 8080

# or let the OS assign a free port
lynx-memory web --port 0

# don't auto-open the browser (useful in headless / SSH sessions)
lynx-memory web --no-open

Action	What happens on disk
Delete a turn	Row removed from SQLite turns and turn_tags; embedding removed from Chroma
Add a tag	Inserted into SQLite tags (created on demand) and turn_tags
Remove a tag	Row removed from turn_tags; orphaned tag is GC'd from tags
Search (keyword)	SQL LIKE over user_msg and assistant_msg — no embedding call
Search (semantic)	One Voyage embedding per query, then top-K from Chroma
Regenerate summary	One API call (OpenAI, DeepSeek, or Qwen, per SUMMARY_BACKEND); writes summary / summary_model / summary_ts back into the turns row

The server only binds to 127.0.0.1. Press Ctrl+C to stop it.

Project-level vs global

Memory is global by default. Run this in a project root:

cd ~/code/my-project
lynx-memory init-project

It creates a .lynx-memory/ marker. As long as your cwd is inside that project, memory transparently switches to the project-level store at <project>/.lynx-memory/db/, isolated from the global one at ~/.openlynx/.

Use /lynx-memory-status to inspect the active scope, and /lynx-memory-pull-global / /lynx-memory-push-global to move history between the two layers.

Configuration

All optional, set in ~/.openlynx/.env:

Variable	Default	Purpose
VOYAGE_API_KEY	—	Required for embeddings
TOP_K	5	Max memories injected per prompt
MIN_SCORE	0.7	Cosine similarity floor (0–1)
SUMMARY_ENABLED	1	Set 0/false to disable per-turn summarization
SUMMARY_BACKEND	auto	auto → first provider with a key set (OpenAI → DeepSeek → Qwen); force with openai, deepseek, or qwen
OPENAI_API_KEY	—	Required when SUMMARY_BACKEND=openai
OPENAI_MODEL	gpt-4o-mini	OpenAI model used for summarization
OPENAI_BASE_URL	https://api.openai.com/v1	Override for OpenAI-compatible endpoints
DEEPSEEK_API_KEY	—	Required when SUMMARY_BACKEND=deepseek
DEEPSEEK_MODEL	deepseek-chat	DeepSeek model used for summarization
DEEPSEEK_BASE_URL	https://api.deepseek.com/v1	Override for the DeepSeek endpoint
QWEN_API_KEY	—	Required when SUMMARY_BACKEND=qwen (DASHSCOPE_API_KEY also accepted)
QWEN_MODEL	qwen-turbo	Qwen model used for summarization
QWEN_BASE_URL	DashScope compatible-mode URL	Override for the Qwen/DashScope endpoint
LYNX_MEMORY_DIR	~/.openlynx	Where SQLite + Chroma live

Optional: MCP server

You can also expose memory as MCP tools for Claude Code (search_memory, list_recent, stats, forget). Add to ~/.claude.json or .mcp.json:

{
  "mcpServers": {
    "lynx-memory": {
      "command": "lynx-memory-mcp"
    }
  }
}

Uninstall

lynx-memory uninstall                   # remove hooks + slash commands + skill links
lynx-memory delete --scope global       # delete the global store (confirms)
# or
rm -rf ~/.openlynx                       # nuke directly (irreversible)

Privacy

• All data stays on your machine in ~/.openlynx/.
• Outbound calls: Voyage AI for embeddings (your prompt text); OpenAI, DeepSeek, or Qwen for per-turn and session summaries (requires an API key — set via .env or the Web UI ⚙ Settings panel).
• Set SUMMARY_ENABLED=0 if you don't want per-turn summaries to leave the box.
• Set LYNX_MEMORY_DIR to encrypt at rest with whatever filesystem-level encryption your OS provides.

Roadmap

• Project-level / global dual-layer storage Global by default; auto-switches to project-level when a .lynx-memory/ marker is found by walking up from cwd, so histories from different projects don't bleed into each other. Run lynx-memory init-project in a project root to create the marker. Search supports scope=auto|project|global|merged (hooks via LYNX_MEMORY_SCOPE env; MCP tools accept a scope argument).

• Codex CLI — same hooks + shared store; use lynx-memory init --target codex (or --target all). See Codex CLI above.

• Local Web UI memory browser A local FastAPI + React UI with paging, keyword / semantic search, single-turn deletion, and tagging (e.g. #work, #personal). Launch with /lynx-memory-history (or lynx-memory web); the page exposes both project-level and global histories with a one-click scope toggle.

• Other CLIs (Cursor, Gemini CLI, …) — not integrated yet. Cursor: blocked until a stable hooks surface ships (we plan to adopt it once available); meanwhile MCP-only workflows remain possible where applicable.

• Unified multi-client installer A future lynx-memory install --client <name> to write MCP configs in one shot, with rules templates for consistent recall across clients that support them.

• Import / export & cross-device sync lynx-memory export / import for JSONL backup and restore; place db/ in iCloud / Dropbox / a Git repo, or use a built-in lynx-memory sync subcommand to share memory across machines.

• Richer automatic tagging (precise vs associative) Stronger auto-labeling for turns, with a switchable precise mode (tight, literal, auditable tags) vs associative mode (broader links and softer clusters to improve semantic recall).

• Recall modes & tunable ranking Let users steer what gets injected beyond raw similarity — combine signals such as retrieval / hit count, relevance score, and recency (last used or last injected), with presets or manual weighting so priority matches your workflow.

License

MIT — see LICENSE.