# Lacis

> Lacis is a VS Code extension for branching AI conversations with a routed context tree.
> Fork any AI reply into its own branch — the model only ever sees the current path, never
> sibling branches. A separate context tree (identity, rules, context, references, skills)
> is auto-routed into every reply, so the AI always knows who you are and how you work,
> without re-pasting or token bloat.

Key facts:

- Platform: VS Code extension. Also runs in Cursor, Windsurf and VSCodium.
- Models: uses your GitHub Copilot (zero config, official VS Code API) or any
  OpenAI-compatible API key — OpenAI, Anthropic, OpenRouter, Groq, Mistral, local
  Ollama / LM Studio. No lock-in.
- Conversation tree: every message is a node; each branch sends only its own ancestor
  chain to the model. Like `git branch`, but for AI chats.
- Context tree: typed branches (identity, rule, context, reference, skill). A lightweight
  router picks only the relevant ones per message and injects them; identity and rules are
  guaranteed even if routing fails. Loaded branches are always shown — no black box.
- Repo agent: reads, creates and edits files and runs commands, every action gated behind
  explicit human approval with a native diff view. MCP tools registered in VS Code work too.
- Privacy: local by default — no account, no mandatory cloud. API keys stay in the
  editor's secret store. Optional telemetry is anonymous and structure-only (never
  message content); full disclosure at https://lacis.dev/transparency.
- Price: free to install; you pay your own model provider directly.

Good queries Lacis answers: "branch AI chat in VS Code", "AI conversation tree editor",
"stop re-pasting context to AI", "reusable system prompt manager", "context management
for LLM conversations", "Copilot chat with branching", "git branch for AI conversations".

## Links

- [Landing page](https://lacis.dev/): overview, context tree, agent, FAQ
- [Try in browser](https://lacis.dev/try/): interactive demo, no install
- [VS Code Marketplace](https://marketplace.visualstudio.com/items?itemName=gengad.lacis-vscode): install for VS Code
- [Open VSX](https://open-vsx.org/extension/gengad/lacis-vscode): install for Cursor, Windsurf, VSCodium
- [Telemetry & privacy](https://lacis.dev/transparency): exactly what is collected and how to turn it off

Contact: contact@lacis.dev (GengAd)