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Codex

Codex uses the @zed-industries/codex-acp adapter for ACP support. The recommended working directory for the Codex image is /home/node; this is also the container HOME, so Codex auth, sessions, generated images, and skills live under /home/node/.codex/.

Docker Image

docker build -f Dockerfile.codex -t openab-codex:latest .

The image installs @zed-industries/codex-acp and @openai/codex globally via npm.

Helm Install

helm install openab openab/openab \
  --set agents.kiro.enabled=false \
  --set agents.codex.discord.botToken="$DISCORD_BOT_TOKEN" \
  --set-string 'agents.codex.discord.allowedChannels[0]=YOUR_CHANNEL_ID' \
  --set agents.codex.image=ghcr.io/openabdev/openab-codex:latest \
  --set agents.codex.command=codex-acp \
  --set agents.codex.workingDir=/home/node

Set agents.kiro.enabled=false to disable the default Kiro agent.

Manual config.toml

[agent]
command = "codex-acp"
args = []
working_dir = "/home/node"

Authentication

kubectl exec -it deployment/openab-codex -- codex login --device-auth

Follow the device code flow in your browser, then restart the pod:

kubectl rollout restart deployment/openab-codex

Persisted Paths (PVC)

Path Contents
/home/node/.codex/auth.json Codex login credentials
/home/node/.codex/config.toml Codex CLI settings and feature flags
/home/node/.codex/sessions/ Session history
/home/node/.codex/generated_images/ Built-in image generation outputs
/home/node/.codex/skills/ User-created Codex skills

Image Generation

Codex image generation is controlled by the Codex CLI feature flag image_generation. Enable it once inside the pod:

kubectl exec -it deployment/openab-codex -- \
  codex features enable image_generation

This writes the following to /home/node/.codex/config.toml:

[features]
image_generation = true

You can verify it with:

kubectl exec -it deployment/openab-codex -- \
  codex features list | grep image_generation

Generated images are saved by Codex under /home/node/.codex/generated_images/.... If the user needs a stable path, ask Codex to copy the selected output into /home/node, for example /home/node/sky-birds.png.

Note: Codex image generation may return a model-native size rather than the exact dimensions requested in the prompt. If exact dimensions matter, resize only when the user explicitly asks for it.

Quick Imagegen Smoke Test

kubectl exec -it deployment/openab-codex -- \
  codex exec \
    --dangerously-bypass-approvals-and-sandbox \
    --enable image_generation \
    --skip-git-repo-check \
    -C /home/node \
    "Use the imagegen skill and the built-in image_gen tool. Generate a simple image of birds flying across a bright sky. Save or copy the final PNG to /home/node/sky-birds.png. Report the output path and dimensions."

Then check for output:

kubectl exec -it deployment/openab-codex -- \
  sh -lc 'ls -lh /home/node/sky-birds.png /home/node/.codex/generated_images/*/* 2>/dev/null | tail'

Sending Generated Images Back to Discord

OpenAB streams text over ACP only. It does not relay image attachments from Codex back to Discord. To send a generated image, Codex must call the Discord REST API directly. See sendimages.md for the full protocol.

The agent should:

  1. Read thread_id from OpenAB's <sender_context> and use it as the Discord target channel. If thread_id is absent, fall back to channel_id.
  2. Upload the file with POST /channels/{id}/messages using multipart form data.
  3. Read the token from DISCORD_FILE_BOT_TOKEN if available, otherwise DISCORD_BOT_TOKEN.

Example upload from inside the pod:

THREAD_ID="1499442140172910654"
IMAGE="/home/node/sky-birds.png"

curl -X POST "https://discord.com/api/v10/channels/${THREAD_ID}/messages" \
  -H "Authorization: Bot ${DISCORD_FILE_BOT_TOKEN:-$DISCORD_BOT_TOKEN}" \
  -F "content=Here is the generated image" \
  -F "files[0]=@${IMAGE}"

Agent Environment for Uploads

The Discord bot token configured under [discord] is consumed by OpenAB itself. For safety, OpenAB clears the inherited environment before spawning the agent and only passes variables listed in [agent].env. If Codex should upload images itself, explicitly expose an upload token to the agent:

[agent]
command = "codex-acp"
args = []
working_dir = "/home/node"
env = { DISCORD_FILE_BOT_TOKEN = "${DISCORD_FILE_BOT_TOKEN}" }

For production, prefer a dedicated "File Deliverer" Discord bot with only Send Messages, Send Messages in Threads, and Attach Files permissions. For small personal deployments, using the same bot token is simpler but gives the agent the same Discord permissions as the main OpenAB bot.

Recommended Skill

For repeated image requests, save the imagegen + Discord upload workflow as a Codex skill under /home/node/.codex/skills/, for example:

/home/node/.codex/skills/discord-imagegen-deliver/
+-- SKILL.md
`-- scripts/
    `-- send-discord-image.sh

The skill should instruct Codex to:

  • Use the built-in imagegen skill and image_gen tool for raster images.
  • Keep the generated image size as-is unless the user explicitly asks for resizing.
  • Copy the selected file from /home/node/.codex/generated_images/... to a stable path under /home/node.
  • Upload it to thread_id or channel_id using the Discord REST API.
  • Avoid printing token values.

Example user prompt after creating such a skill:

Use $discord-imagegen-deliver to generate a warm hand-painted sky with birds and send it back to this Discord thread.

Troubleshooting

bwrap: No permissions to create a new namespace

Some Kubernetes environments do not allow unprivileged user namespaces, which can block Codex's default sandbox when running nested codex exec commands. For manual smoke tests inside an already isolated pod, use:

codex exec --dangerously-bypass-approvals-and-sandbox ...

Do not use this flag on an untrusted host.

Imagegen appears to hang

Check whether an image was generated even if the CLI has not returned yet:

find /home/node/.codex/generated_images -type f -name '*.png' -printf '%T@ %p %s\n' | sort -n | tail

If a file exists, copy it to a stable path and upload it manually with the Discord API command above.

No image upload appears in Discord

Verify the agent can see an upload token:

kubectl exec -it deployment/openab-codex -- \
  sh -lc 'test -n "$DISCORD_FILE_BOT_TOKEN$DISCORD_BOT_TOKEN" && echo token-present || echo token-missing'

Also confirm the bot has Send Messages, Send Messages in Threads, and Attach Files permissions in the target channel or thread.