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Codex/OpenClaw skill for generating images with ChatGPT/Codex OAuth

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# Codex Imagen

[![CI](https://github.com/darkamenosa/codex-imagen/actions/workflows/ci.yml/badge.svg)](https://github.com/darkamenosa/codex-imagen/actions/workflows/ci.yml)

OpenClaw skill and helper CLI for generating or editing images through the ChatGPT/Codex backend with local OAuth credentials.

By default this follows Codex's current hosted image flow: `POST /responses` with the native `image_generation` tool. The standalone typed image endpoints are available for probing with `--backend images`, but Codex source currently gates that path behind the under-development image-generation extension. The helper also preserves ChatGPT Cloudflare cookies for allowed ChatGPT hosts, matching Codex's restricted request client behavior. It does not start `codex app-server`, does not require a Codex binary, and does not require `OPENAI_API_KEY`.

## Requirements

- Node.js 22+
- Existing Codex or OpenClaw `openai-codex` OAuth credentials on the machine

Supported auth stores:

- OpenClaw auth profiles: `~/.openclaw/agents/main/agent/auth-profiles.json`
- OpenClaw agent auth: `~/.openclaw/agents/main/agent/auth.json`
- OpenClaw legacy OAuth: `~/.openclaw/credentials/oauth.json`
- Codex CLI/Desktop: `~/.codex/auth.json`

## Quick Start

Check auth without generating:

```bash
node scripts/codex-imagen.mjs --smoke
```

Generate one image:

```bash
node scripts/codex-imagen.mjs 'generate image follow this prompt, no refine: "a cinematic fantasy city at sunrise"'
```

Ask for multiple outputs in the prompt. There is no `--count` flag.

```bash
node scripts/codex-imagen.mjs --timeout 900 'generate 3 images follow this prompt, no refine: "three distinct ancient ARPG MMO screenshots"'
```

Normal generation prints one saved PNG path per line. Diagnostics and progress are written to stderr unless `--quiet` is used.

## CLI Usage

```bash
node scripts/codex-imagen.mjs "prompt" [options]
```

Prompt options:

- `--prompt <text>`: prompt text.
- `--prompt-file <path>`: read UTF-8 prompt text from a file.
- Positional text is accepted when `--prompt` and `--prompt-file` are not used.

Reference image options:

- `-i, --image <path>`: attach local image files. Repeat or comma-separate.
- `--input-ref <path|url>`: attach local paths, `http(s)` URLs, or `data:image/...` URLs. Repeat or comma-separate.
- `--image-url <url>`: attach an `http(s)` or `data:image/...` URL.
- `--image-detail <auto|low|high|original>`: set the Responses `input_image.detail` value. Ignored by `--backend images`. Default: `high`.

Output options:

- `-o, --output <path>`: exact PNG path for one image, directory for many, or a path template that is numbered for multiple images.
- `--out-dir <path>`: output directory when `--output` is not provided.
- `--json`: print a machine-readable summary instead of only image paths.

Runtime options:

- `--backend <responses|images>`: Codex image backend. Default: `responses`, matching current Codex hosted `image_generation`. `images` calls the under-development standalone typed endpoint.
- `--model <name>`: model slug. Defaults: `gpt-5.4` for `responses`, `gpt-image-2` for `images`.
- `--retries <count>`: retry transient empty failures this many times. Default: `4`, matching Codex's request retry default of 5 total attempts. Retries apply to network failures, HTTP 5xx, backend `server_error` / overloaded / unavailable responses, dropped/incomplete streams before any image is saved, and typed JSON responses without image data.
- `--no-retry`: disable transient generation retries.
- `--timeout <seconds>`: abort after this many seconds per generation attempt. Default: `900`, or `300` when an OpenClaw runtime is detected; must be greater than `0`. This is the recommended flag for OpenClaw and other agent usage.
- `--timeout-seconds <seconds>`: alias for `--timeout`.
- `--timeout-ms <ms>`: advanced compatibility flag for millisecond timeouts and sub-second tests. Use only one timeout flag per command. After timeout, a hard watchdog forces exit code `124` if the HTTP abort does not settle.
- `--no-stream`: request a non-streaming Responses response. The `images` backend is always non-streaming JSON.
- `--quiet`: suppress progress diagnostics on stderr.
- `--verbose` or `--debug`: print request progress, raw Responses event names, and reference image details to stderr.
- `--cwd <path>`: resolve relative input/output paths from this working directory.
- `--base-url <url>`: Codex backend base URL. Default: `https://chatgpt.com/backend-api/codex`.
- `--refresh-url <url>`: OAuth refresh endpoint. Default: `https://auth.openai.com/oauth/token`.

Auth options:

- `--auth <path>`: explicit auth JSON path.
- `--auth-profile <id>`: OpenClaw profile id, for example `openai-codex:hxtxmu@gmail.com`.
- `--smoke`: print redacted auth metadata and exit without generation.
- `--force-refresh`: refresh OAuth before generating.
- `--refresh-only`: refresh OAuth and exit. Does not require a prompt.
- `--no-refresh`: disable proactive refresh and the 401 refresh retry.

## Reference Images

Use explicit reference-image flags. Positional arguments are reserved for prompt text.

```bash
node scripts/codex-imagen.mjs --input-ref ref1.png --input-ref ref2.jpg --prompt 'generate 3 images of him livestreaming in this world'
node scripts/codex-imagen.mjs -i ref1.png -i ref2.jpg --prompt 'change the main character into a woman'
node scripts/codex-imagen.mjs --image-url 'https://example.com/ref.png' --prompt 'use this image as the environment reference'
```

Local references are converted to base64 `data:image/...` input images before sending. Supported local formats are PNG, JPEG, GIF, and WebP. The CLI warns when a base64 reference is large; use smaller JPEG references when high-fidelity pixel detail is not needed.

## Output Paths

When no output option is set, the first available directory is used:

1. `CODEX_IMAGEN_OUT_DIR`
2. `OPENCLAW_OUTPUT_DIR`
3. `OPENCLAW_AGENT_DIR/artifacts/codex-imagen`
4. `OPENCLAW_STATE_DIR/artifacts/codex-imagen`
5. `./codex-imagen-output`

Automatic filenames use:

```text
codex-imagen-<timestamp>-<optional-index>-<image-call-id>.png
```

`--output` behavior:

- `--output image.png` with one image writes exactly `image.png`.
- `--output image.png` with multiple images writes `image-1.png`, `image-2.png`, and so on.
- `--output out/` or `--output out` treats the value as a directory and uses automatic filenames.
- `--out-dir out` always writes automatic filenames under `out`.

In the default streaming Responses mode, each image is written as soon as it arrives. If a run times out after partial results, already saved images remain on disk and are still printed. If the hosted Responses stream terminates or closes before `response.completed`, the command follows Codex semantics: already completed images remain saved, but the command exits with a stream error.

## Auth Lookup

Lookup order:

1. `--auth`
2. `CODEX_IMAGEN_AUTH_JSON`, `OPENCLAW_CODEX_AUTH_JSON`, `CODEX_AUTH_JSON`
3. `OPENCLAW_AGENT_DIR/auth-profiles.json` or `PI_CODING_AGENT_DIR/auth-profiles.json`
4. `OPENCLAW_AGENT_DIR/auth.json` or `PI_CODING_AGENT_DIR/auth.json`
5. `~/.openclaw/agents/main/agent/auth-profiles.json`
6. `~/.openclaw/agents/main/agent/auth.json`
7. `~/.openclaw/credentials/oauth.json`
8. `CODEX_HOME/auth.json`
9. `~/.codex/auth.json`

Profile selection for OpenClaw `auth-profiles.json`:

1. `--auth-profile`
2. `CODEX_IMAGEN_AUTH_PROFILE` or `OPENCLAW_AUTH_PROFILE`
3. OpenClaw config `auth.order.openai-codex`, then configured `auth.profiles` for `openai-codex`
4. sibling `auth-state.json` `lastGood.openai-codex`
5. best available `openai-codex` OAuth profile, preferring `openai-codex:default`, later expiry, email, and account id

Codex CLI is optional. If OpenClaw created the `openai-codex` OAuth profile through `openclaw onboard --auth-choice openai-codex` or `openclaw models auth login --provider openai-codex`, this helper can use that profile directly without installing Codex CLI. The helper reads and refreshes existing credentials; it does not run the first browser login itself.

## OAuth Refresh

The CLI refreshes expired or near-expiry OAuth tokens with the OpenAI OAuth refresh endpoint and writes updates back to the same auth file. The default refresh skew is 5 minutes, matching OpenClaw's OAuth usability margin.

When the auth file is OpenClaw's `auth-profiles.json`, refresh uses the same cross-agent lock path OpenClaw uses for `openai-codex` OAuth profiles, then locks the auth store before rereading and writing credentials. It also inherits a fresh matching profile from the main OpenClaw agent store when the current agent/workspace auth store is stale. That prevents concurrent agents from racing on one single-use refresh token and causing `refresh_token_reused`.

When auth is auto-discovered and the first auth file is irrecoverably stale, the CLI tries the next compatible auth source, such as `CODEX_HOME/auth.json` or `~/.codex/auth.json`. Explicit `--auth` paths are not bypassed.

```bash
node scripts/codex-imagen.mjs --refresh-only --json
node scripts/codex-imagen.mjs --force-refresh --smoke --json
node scripts/codex-imagen.mjs --no-refresh --prompt 'generate one image'
```

Use `--no-refresh` only when the caller already owns token refresh. For normal standalone/OpenClaw skill usage, leave refresh enabled.

## JSON Output

Use `--json` for the full machine-readable summary:

```bash
node scripts/codex-imagen.mjs --json 'generate a small blue lotus icon'
```

Generation JSON includes:

- `request_id`, `session_id`, `endpoint`, `model`
- `image_count` and `imageCount`
- `images[].path` and `images[].decodedPath`
- `images[].bytes`, `sha256`, `call_id`, `status`, `partial`, `revised_prompt`
- `seen_event_types`
- `operation`, for example `responses image_generation`, `image generation`, or `image edit`
- `response_metadata` for typed Images responses
- `timed_out`
- `retry_attempts` and `retryAttempts` when a later retry succeeds
- `auth_refresh` when refresh happened or was skipped during the run

`--smoke --json` prints redacted auth metadata. `--refresh-only --json` prints refresh metadata.

## OpenClaw Usage

Use the skill directory as an OpenClaw skill:

```text
codex-imagen/
  SKILL.md
  scripts/codex-imagen.mjs
```

OpenClaw callers should usually rely on the active agent auth store and output directory:

```bash
node {baseDir}/scripts/codex-imagen.mjs --json --timeout 300 --prompt 'generate an image'
```

`--timeout 300` means 5 minutes and matches OpenClaw's surrounding `exec` tool `timeout` unit. `--timeout-ms 300000` is still accepted for older callers and advanced millisecond use.

For prompts that ask for 3 images, prefer `--timeout 600`, or ask for 2 images when the conversation should return quickly. If a multi-image request times out after saving 1 or 2 images, the helper returns those saved paths with `timed_out: true`.

By default the helper also retries transient empty failures with `--retries 4`, so a caller that sets a strict outer OpenClaw `exec.timeout` should budget for retry time or pass `--no-retry`. The helper never retries after streaming has saved an image. Timeouts after saved images return the saved paths; broken hosted Responses streams after saved images leave the files on disk but exit with a stream error, matching Codex turn semantics.

Use `--cwd <path>` when another agent launches this script from an unpredictable working directory.

## Cross-Platform Notes

The helper is plain Node.js 22+ and uses `os.homedir()`, `path`, and environment overrides instead of platform-specific shell behavior. It should work on macOS, Linux, and Windows.

In Windows `cmd.exe`, single quotes are not shell quotes, so use double quotes or `--prompt-file`:

```bat
node scripts\codex-imagen.mjs --prompt-file prompt.txt --out-dir out
```

PowerShell accepts normal quoted strings, but for long prompts `--prompt-file` is still safer.

## Exit Codes

- `0`: success
- `1`: generation failed, no image returned, or HTTP error
- `2`: invalid CLI usage
- `124`: timed out before any image was saved, or the hard watchdog forced exit after abort did not settle

## Development

Run local static checks:

```bash
npm run check
```

The CI workflow checks syntax and CLI help/version output. It does not call live image generation because that requires local OAuth credentials.

## License

MIT

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