plastic-labs/codex-honcho

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# codex-honcho [![codex-honcho](./assets/honcho_codex.png)](https://honcho.dev) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![npm](https://img.shields.io/npm/v/@honcho-ai/codex-honcho?color=blue)](https://www.npmjs.com/package/@honcho-ai/codex-honcho) [![Honcho](https://img.shields.io/badge/Honcho-Memory%20API-blue)](https://honcho.dev) **Persistent memory for [OpenAI Codex](https://developers.openai.com/codex), powered by [Honcho](https://honcho.dev) from Plastic Labs.** Give Codex long-term memory that survives context resets, session restarts, and fresh conversations. Codex remembers what you're working on, your preferences, and the decisions you've made — across every project. Lifecycle hooks capture each session to Honcho and inject the relevant context back at session start, so you never have to repeat yourself. ## What You Get - **Persistent Memory** — Codex remembers your preferences, projects, and context across sessions - **Survives Context Resets** — Memory persists through `/clear`, compaction, and restarts - **Active Recall** — Codex can search your history and query what Honcho knows about you mid-task, not just at startup - **Git Awareness** — Optionally scope memory per branch, so feature work keeps its own context - **Flexible Sessions** — Map memory per directory, per git branch, or per chat instance - **Local-First Capture** — Conversations are queued to disk instantly and uploaded in the background — capture never blocks your turn or hits the network mid-conversation - **Cross-Tool Context** — Shares `~/.honcho/config.json` with other Honcho integrations (Claude Code, Cursor, …), so context can follow you between tools ## Prerequisites - **[Codex](https://developers.openai.com/codex) ≥ 0.136.0** - **[Node](https://nodejs.org)** on your `PATH` (runs the installer and the hooks) ## Quick Start ### Step 1: Get Your Honcho API Key 1. Go to **[app.honcho.dev](https://app.honcho.dev)** 2. Sign up or log in 3. Copy your API key (starts with `hch-`) ### Step 2: Save Your API Key Your key lives in **`~/.honcho/config.json`** — the single config file every Honcho integration reads. codex-honcho takes the key straight from there. **Already have your key in `~/.honcho/config.json`?** If another Honcho integration already wrote it there, there's nothing to do — skip to Step 3 and `install` picks it up automatically. (codex-honcho reads only this file, `hosts.codex`, and `HONCHO_API_KEY` — not any tool's private config, so confirm the key is in `~/.honcho/config.json` with `codex-honcho status`.) **First time?** Create it with the Honcho CLI: ```bash honcho init # prompts for your key, writes ~/.honcho/config.json # no CLI yet? uv tool install honcho-cli && honcho init ``` Either way the key stays in one place. If you'd rather write the file yourself: ```jsonc // ~/.honcho/config.json { "apiKey": "hch-your-api-key-here" } ``` ### Step 3: Install the Plugin ```bash npm install -g @honcho-ai/codex-honcho codex-honcho install # registers hooks + MCP + skill in ~/.codex ``` `install` copies your resolved key into `~/.codex/config.toml` so the Honcho MCP server authenticates with no environment variable to set. If you ever rotate your key, re-run `codex-honcho install` to refresh it. ### Step 4: Restart Codex Restart Codex (or start a new session) to load the hooks and the `[features].hooks` flag. On your next session start you'll see Honcho memory load into context. ### Step 5: (Optional) Tell Codex to use its memory The bundled `honcho-memory` skill already nudges Codex to recall and save actively. To reinforce it, add a short directive to your global Codex instructions (`~/.codex/AGENTS.md`): ```markdown # Honcho Memory You have persistent memory via Honcho. Context about me is loaded at the start of every session — trust it and act on it; don't ask me what you already know. Use the Honcho MCP tools (`search`, `chat`) to recall more mid-task, and `create_conclusions` to save new preferences, decisions, and patterns as you learn them. ``` ## MCP Tools Once installed, Codex can call these Honcho tools directly: | Tool | Description | | --------------------- | --------------------------------------------------- | | `search` | Semantic search across your session messages | | `chat` | Ask Honcho a natural-language question about you | | `get_peer_context` | Fetch the current model of you (representation + peer card) | | `get_representation` | Lightweight representation string | | `create_conclusions` | Save durable insights to memory | | `list_conclusions` | List saved conclusions | | `query_conclusions` | Semantic search across derived conclusions | | `delete_conclusion` | Remove a conclusion by ID | ## Commands | Command | Effect | | ------------------------ | ------------------------------------------------- | | `codex-honcho install` | Install hooks + MCP + skill | | `codex-honcho status` | Installed components, pending queue depth, GUI link | | `codex-honcho remove` | Strip only what this installs | ## Configuration All settings live in `~/.honcho/config.json` (shared with other Honcho integrations). Codex-specific settings go under `hosts.codex`, falling back to the root fields. The hooks only ever read this file; `install` is the only writer. ```jsonc { "apiKey": "hch-…", "peerName": "alice", // your identity (default: $USER) "hosts": { "codex": { "workspace": "codex", // Honcho workspace for Codex memory "sessionStrategy": "per-directory", "injectPerPrompt": false, // re-inject context every turn (off by default) "saveMessages": true // false = read memory but never write } } } ``` ### Session Strategies Controls how Codex conversations map to Honcho sessions: | Strategy | Session name | Best for | | --- | --- | --- | | `per-directory` (default) | `my-app` | Most users — each project accumulates its own memory | | `git-branch` | `my-app-main` | Feature-branch workflows where context per branch matters | | `chat-instance` | `my-app-019ea7df` | Ephemeral usage — a clean slate per conversation | An explicit `sessions[cwd]` mapping overrides all strategies. Environment overrides: `HONCHO_API_KEY`, `HONCHO_PEER_NAME`, `HONCHO_CONFIG_DIR`. ## How It Works ``` ┌──────────────────────────────────────────────────────────────────────┐ │ Codex │ ├──────────────────────────────────────────────────────────────────────┤ │ SessionStart │ UserPrompt │ PostToolUse │ Stop / PreCompact │ │ ─────────── │ ─────────── │ ──────────── │ ───────────────── │ │ recall: │ prompt: │ observe: │ writeback: │ │ load context │ (optional) │ note tool │ capture the new │ │ from Honcho │ per-turn ctx │ calls │ transcript tail │ └──────────────────────────────────────────────────────────────────────┘ │ ▼ ~/.honcho/codex/queue/<key>.jsonl (append-only, local, instant) │ ▼ flush (inline, end of turn) Honcho API → Persistent Memory │ ▼ retrieved as context at the next session start ``` The plugin hooks into Codex's lifecycle events: - **SessionStart** (`recall`) — creates/materializes the session and injects a lean `<honcho-memory>` context block - **UserPromptSubmit** (`prompt`) — optional per-turn context injection (off by default; the MCP tools cover depth) - **PostToolUse** (`observe`) — appends a one-line note for significant tool calls to the local queue - **Stop / PreCompact** (`writeback`) — captures the new transcript tail, then flushes the queue to Honcho Capture is **local-first**: hooks only ever append to a plain JSONL queue, so they're instant and never touch the network. The flush is lock-guarded and advances a per-chunk sent marker, so a failed or partial upload simply stays queued and retries on the next turn. Inspect the local queue any time with `tail -f ~/.honcho/codex/queue/*.jsonl`, and run `codex-honcho status` to see the pending depth plus a deep link to your session in the Honcho GUI to confirm what landed server-side. ## Troubleshooting **No memory loading / MCP not registered.** Confirm your key is in `~/.honcho/config.json` (`codex-honcho status` shows `honcho config: found`). If it's missing, run `honcho init` (or add `{ "apiKey": "hch-…" }` to the file yourself), then re-run `codex-honcho install` — without a key, install registers the hooks and skill but skips the MCP server. **Hooks aren't firing.** Restart Codex after installing so it loads `hooks.json` and the `[features].hooks` flag. Check `codex-honcho status` for installed components and pending queue depth. **Memory not persisting.** Make sure `saveMessages` isn't set to `false` under `hosts.codex`. ## What Install Writes | Path | Change | |---|---| | `~/.codex/honcho/` | staged copy of the bundle the hooks run (kept stable across npm/npx cache eviction) | | `~/.codex/hooks.json` | adds the four hook entries (merged; your own hooks untouched) | | `~/.codex/config.toml` | sets `[features].hooks = true`; registers `[mcp_servers.honcho]` → `mcp.honcho.dev` (native HTTP) | | `~/.codex/skills/honcho-memory/` | the active-recall skill | | `~/.honcho/config.json` | persists the resolved `apiKey` + `peerName` (other fields and `hosts.*` blocks preserved) | `codex-honcho remove` reverses exactly these. ## Install from a GitHub Clone (no npm) ```bash git clone https://github.com/plastic-labs/codex-honcho cd codex-honcho ./install.sh # bun install + bun run bin/codex-honcho.ts install ``` The clone path runs the TypeScript source directly and so requires **[bun](https://bun.sh)**; it wires the hooks to `bun run <this dir>/bin/codex-honcho.ts`, so keep the clone in place. The npm install instead stages the bundled `dist/codex-honcho.mjs` to `~/.codex/honcho/` and wires hooks to `node` — node-only, and stable across `npm update`, npx cache eviction, or removing the package. ## Development ``` bin/codex-honcho.ts CLI: install · remove · status · <hook verb> src/dispatch.ts verb → handler routing src/hooks/ recall · prompt · observe · writeback · flush src/transcript/codex.ts Codex rollout (.jsonl) parser src/queue.ts append-only outbox + sent high-water-mark src/cursor.ts per-conversation rollout delta cursor src/connectors/ hooks.json · config.toml MCP block · skill writers src/config.ts hosts.codex resolution; session naming skills/honcho-memory/ when-to-recall guidance for the model ``` ```bash bun test bun run typecheck ``` ## License MIT — see [LICENSE](LICENSE) ## Links - **Honcho**: [honcho.dev](https://honcho.dev) — the memory API - **Documentation**: [docs.honcho.dev](https://docs.honcho.dev) - **Discord**: [Join the community](https://discord.gg/plasticlabs) - **X**: [@honchodotdev](https://x.com/honchodotdev) - **Plastic Labs**: [plasticlabs.ai](https://plasticlabs.ai)

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Persistent cross-session memory via Honcho — recall what you know about the user before working, and save durable insights after.

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2026-07-07

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