Codex Honcho

codex-honcho

Codex adapter for Honcho MCP with local transcript sync.

This repository fills a narrow gap between OpenAI Codex and Honcho:

• A stdio MCP server that exposes Honcho memory tools to Codex.
• A local transcript sync process that imports visible Codex session messages from

~/.codex/sessions/**/*.jsonl into Honcho sessions.

Honcho already has an official MCP server. This project is not a replacement for it. It is a Codex-focused companion for users who want local Codex sessions to show up in Honcho under a codex peer and remain searchable across tools.

Requirements

• Bun. The package entrypoints are TypeScript files with a Bun shebang, so Bun is

still the runtime when launched through npx, pnpm dlx, or bunx.

• Codex CLI
• A Honcho API key or self-hosted Honcho endpoint

Install

For normal MCP use, no checkout is required. Use a package runner in your MCP configuration:

bunx --package codex-honcho codex-honcho
npx -y codex-honcho
pnpm dlx codex-honcho

Or install the command globally:

bun install --global codex-honcho
npm install --global codex-honcho
pnpm add --global codex-honcho

After a global install, the commands are:

codex-honcho
codex-honcho-mcp
codex-honcho-sync

Create ~/.honcho/config.json:

{
  "apiKey": "replace-with-your-honcho-api-key-or-use-HONCHO_API_KEY",
  "peerName": "your-name",
  "endpoint": {
    "baseUrl": "https://api.honcho.dev/v3"
  },
  "hosts": {
    "codex": {
      "workspace": "replace-with-your-workspace-id",
      "aiPeer": "codex"
    }
  },
  "sessionStrategy": "per-directory",
  "sessionPeerPrefix": true,
  "observationMode": "unified"
}

Use a stable workspace value for this machine or project group, for example laptop, workstation, or personal-codex. You can also omit apiKey and set HONCHO_API_KEY in the environment.

Wire Codex MCP

Recommended bunx config for ~/.codex/config.toml:

[mcp_servers.honcho]
command = "bunx"
args = ["--package", "codex-honcho", "codex-honcho"]

Equivalent npx config:

[mcp_servers.honcho]
command = "npx"
args = ["-y", "codex-honcho"]

Equivalent pnpm dlx config:

[mcp_servers.honcho]
command = "pnpm"
args = ["dlx", "codex-honcho"]

If you installed the package globally:

[mcp_servers.honcho]
command = "codex-honcho"
args = []

Restart Codex after editing the config.

Sync Codex Transcripts

Import recent sessions once:

bunx --package codex-honcho codex-honcho-sync --recent 20
npx -y --package codex-honcho codex-honcho-sync --recent 20
pnpm dlx --package codex-honcho codex-honcho-sync --recent 20

Run continuously:

bunx --package codex-honcho codex-honcho-sync --watch --recent 50
npx -y --package codex-honcho codex-honcho-sync --watch --recent 50
pnpm dlx --package codex-honcho codex-honcho-sync --watch --recent 50

Install a user-level systemd service:

./scripts/install-systemd-user.sh

The importer stores dedupe state at:

~/.honcho/codex-honcho/state/codex-session-sync.json

How Sessions Are Named

The MCP server and sync process use the same Honcho session name:

codex-

For example, a Codex session in /home/me/code/my-app becomes:

codex-my-app

Each imported session includes the human peer from peerName and the Codex peer from hosts.codex.aiPeer.

MCP Tools

The MCP server exposes:

• search
• create_conclusion
• list_conclusions
• delete_conclusion
• get_context
• get_representation
• get_config

The server deliberately does not expose Honcho chat; Codex can reason locally after retrieving Honcho context.

Safety Notes

• Do not commit ~/.honcho/config.json; it may contain your API key.
• The sync process imports only visible Codex user_message and agent_message events.

It skips encrypted reasoning and base instructions.

• Very long messages are truncated before upload. Metadata records the original length.

Development

git clone https://github.com/iuliandita/codex-honcho.git
cd codex-honcho
bun install
bun test
bun run sync -- --recent 1 --dry-run

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: iuliandita
• Source: iuliandita/codex-honcho
• License: MIT

Install and usage instructions live in the source repository linked above.