What problem does it solve? Running Codex CLI in the foreground blocks the main conversation, and its capabilities like built-in image generation are easy to miss or misuse. This Skill turns Codex into a background sub-agent you launch, monitor, and compose into parallel agent teams without stalling your workflow. ## Core Features & Use Cases - Image Generation via Codex: Generate image sets (logos, illustrations, og images) through Codex's built-in OpenAI image tool, with prompt-file conventions, three-pass acceptance checks (thumbnail contact sheet, alpha bounding-box ratio, independent blind review), and compression guidance. - Background Sub-Agent Launches: Run codex exec with run_in_background, stdin-piped prompt files, sandbox selection, and 2>/dev/null stderr suppression so thinking tokens never flood the main context. - Parallel Agent Teams: Split work into independent slices (security review, perf review, migration drafts) across multiple Codex workers with collision-avoidance rules for workspace-write sandboxes. - Use Case: Ask for a set of 6 character illustrations for a landing page; the Skill writes a prompt file with exact filenames, palette, and sizing rules, launches Codex in the background, then verifies every image before wiring it into the page. ## Quick Start Ask the agent to use Codex to generate a set of images or to review a repository in the background, and it will launch codex exec with the right sandbox and effort level automatically.