skilld
All skills
simota avatar

/builder

@c805268
by shingo imotasimota/agent-skills85 stars
15

Implementing robust business logic, API integrations, data models, and reproducible AI image-generation code with type safety. Use for production implementation, Gemini image API pipelines, or interactive pair programming.

Ask your Agent

Use this Skill: https://skilld.dev/gh/simota/agent-skills/builder

This session only. Nothing lands on disk.

referenceimage-generation-codex.md

≈710 tokens on demand. Your agent reads this file only when SKILL.md points to it.

Codex Built-in Image Generation (image_gen)

Alternative engine to the Gemini API path: OpenAI Codex (CLI / desktop / IDE extension) ships a built-in image_gen tool backed by gpt-image-2. It runs inside a ChatGPT Plus/Pro subscription — ChatGPT account auth only, no OPENAI_API_KEY, no per-image billing. Researched 2026-08.

When to prefer over the Gemini API path

Signal Engine
User wants images without API billing, already pays for ChatGPT Plus/Pro Codex image_gen
Reproducible code deliverable, seeds, batch pipelines, metadata (Builder image-generation contract) Gemini API (default)
Assets generated alongside a coding session and saved into the repo Codex image_gen
Fine parameter control (resolution tiers, aspect ratios, thinking level, grounding) Gemini API

Builder's deliverable stays "code, not images" on the Gemini path; the Codex path is operating guidance (commands + config), not Python code.

Usage

  • Inside Codex CLI, request in natural language, or invoke the built-in skill explicitly as $imagegen. Outputs are saved under $CODEX_HOME.
  • Some installs require enabling the feature in ~/.codex/config.toml:
[features]
image_generation = true
  • If saving fails, check the sandbox mode: --sandbox workspace-write (read-only sandbox cannot write generated files — community report, unverified).
  • Transparent backgrounds: image_gen generates via chroma-key + post-process script, or falls back to gpt-image-1.5 (per the official imagegen SKILL.md).
  • Do not confuse with --image / -i: that flag is image input (vision) for mockup-to-code, not generation. Input constraints: no BMP/TIFF/SVG/HEIC, ≤5MB recommended.

Cost model

  • Consumes standard Codex usage limits; an image-generation turn burns the quota 3–5× faster than a text turn (official docs).
  • No extra charge within the subscription. For high volume, switching to the OpenAI Image API (metered, OPENAI_API_KEY) is the documented alternative — that path exits the subscription.

UNVERIFIED (as of 2026-08)

  • Whether image_gen works in Codex cloud (async tasks; agent phase defaults to network-off sandbox).
  • Whether Codex image_gen quota is shared with ChatGPT's own image generation.
  • "Unlimited on Pro" claims (personal-blog sourced only).
  • Full official parameter reference for $imagegen.

Sources

Source: SKILL.md on GitHub

Third-party checks

No alerts13d5 checks · Risk SAFE
  • Gen Agent Trust Hub13d

    The skill provides a comprehensive environment for production-grade software development, API integration, and AI image-generation pipelines. It enforces strict engineering standards, including type safety, boundary validation, and secure secret management. While it recommends several external libraries for CLI development and image processing, all targeted resources are well-known and reputable. No malicious patterns, obfuscation, or unauthorized data access were detected.

  • Socket13d

    No alerts

  • Snyk13d

    Risk: LOW · No issues

  • Runlayer6mo

    3/8 files flagged

  • ZeroLeaks5mo

    Score: 93/100 · 2 sections analyzed

Provenance

Signed by skilld at c805268. This ties the file your Agent reads to that commit on GitHub. It does not review the instructions.

Last checked against GitHub 3 days ago.

Activeupdated 2 weeks ago

README badge

README badge for simota/agent-skills/builder