pi-imagegen

Pi extension for image generation, with two kinds of backends:

Backend	What it uses	Good for
codex-oauth (default)	pi's own Codex/ChatGPT OAuth login — no Codex CLI, no API key	Anyone already logged into pi with the OpenAI Codex provider
openai-compatible	Any POST /v1/images/generations + /images/edits API	Self-hosted gateways (e.g. llm-center), OpenAI, proxies

The default codex backend calls the Codex backend Responses API with the image_generation tool using the bearer token from pi's credential store (pi auth print-bearer-token --provider openai-codex). It never shells out to the Codex CLI.

Install

pi install npm:@mics8128/pi-imagegen

For a project-local install, use -l; the first run must explicitly trust the project-local package configuration:

pi install npm:@mics8128/pi-imagegen -l
pi --approve

Or for a one-off test:

pi -e npm:@mics8128/pi-imagegen

pi vs prime-agent

The same package works in both hosts — no separate publish. Each host keeps its own package list, so install once per host:

• pi: pi install npm:@mics8128/pi-imagegen (writes to ~/.pi/agent)
• prime-agent: prime-agent package install npm:@mics8128/pi-imagegen (writes to ~/.prime/agent), or run either CLI with -e npm:@mics8128/pi-imagegen for a one-off

The extension detects the host config dir at runtime, so Codex OAuth tokens resolve from the right store in both cases.

Note: the unscoped npm name pi-imagegen is an unrelated package by another author (github.com/Jon-Vii/pi-imagegen). This package is @mics8128/pi-imagegen only.

Use

Ask the agent to generate or edit an image. It will call the imagegen tool:

imagegen({ prompt: "a cyberpunk cat", outputPath: "cat.png" })
imagegen({ prompt: "make the sky sunset orange", inputImages: ["photo.jpg"] })
imagegen({ prompt: "...", provider: "llm-center" })

Generated images are saved to .pi/images/ (configurable) and returned inline to the conversation.

TUI preview

The tool returns images as native image content blocks, so pi / prime-agent render them inline in the TUI on terminals that support the Kitty graphics protocol (kitty, Ghostty, WezTerm). On unsupported terminals the tool result still shows the saved file path. No extra configuration is needed.

Configure

Settings are merged from (low → high priority):

1. Host-global settings: ~/.pi/agent/settings.json for pi, or ~/.prime/agent/settings.json for prime-agent. The corresponding PI_CODING_AGENT_DIR or PRIME_AGENT_CODING_AGENT_DIR environment variable overrides its host default.
2. <cwd>/.pi/settings.json (project)

${ENV_VAR} / $ENV_VAR interpolation is supported, so keys can come from the environment.

{
  "pi-imagegen": {
    "defaultProvider": "codex",
    "outputDir": ".pi/images",
    "providers": {
      "codex": {
        "model": "gpt-5.6-luna",
        "size": "1024x1024"
      },
      "llm-center": {
        "type": "openai-compatible",
        "authProvider": "llm-esapp",
        "baseUrl": "https://llm.esapp.net/v1",
        "model": "gpt-image-2"
      }
    }
  }
}

Reuse pi / prime-agent credentials

For an OpenAI-compatible provider, authProvider uses the credential already resolved by the current host's modelRegistry. The example above therefore uses the logged-in llm-esapp credential without an environment variable or an API key in settings.json.

The host-supplied API key, headers, and base URL fill missing values. An explicit baseUrl or header in pi-imagegen settings overrides the matching host value, which lets one host credential be used through a chosen proxy. If no authProvider is set, use apiKey as before.

Provider fields

Field	codex-oauth	openai-compatible
type	"codex-oauth" (default for provider codex)	"openai-compatible" (default for any other name)
model	e.g. gpt-5.6-luna	e.g. gpt-image-1
baseUrl	optional override (default https://chatgpt.com/backend-api)	required unless authProvider supplies it; e.g. https://host/v1
authProvider	not used	optional existing pi / prime-agent provider name, e.g. "llm-esapp"
apiKey	not used (pi OAuth)	optional when authProvider supplies request auth; otherwise supports ${ENV_VAR}
size / quality	optional defaults	optional defaults
headers	optional extra headers	optional extra headers; explicit values override host-provided values

Codex auth

The codex backend needs pi to be logged in with the OpenAI Codex provider:

pi auth check --provider openai-codex

Token refresh is delegated to the pi CLI, so expired tokens refresh exactly like normal pi usage.

Commands

• /imagegen-doctor — check settings, configured providers, host-managed credential providers, and Codex OAuth readiness.

Requirements

• Pi (pi) on PATH for the codex backend (credential access only)
• Node 22+ (global fetch, FormData)

License

MIT