video-workbench/investigations/2026-06-23-gpt-image-2-advisor-prompt-quality

GPT Image 2 Advisor Prompt Quality Investigation

Purpose

This investigation tests a workflow premise before any GPT / video-workbench restructuring:

If Codex uses the gpt-image-2 skill in Advisor mode and combines it with the accepted GPT director knowledge, the resulting image prompts should be stronger than ordinary GPT direct prompts.

This is a prompt-text quality test only. It does not validate final image quality because no image generation is performed.

Scope

The test compares two prompt styles across five representative video-workbench scenes:

1. Direct prompt: a normal prompt written without consulting gpt-image-2 templates.
2. Advisor prompt: a prompt rendered after reading the relevant gpt-image-2 skill guidance and templates.

The current environment was checked with the skill's mode detector. It returned B-or-C, with Garden disabled and no local API key. This investigation forces Mode C / Advisor: save and compare prompts only.

Skill References Read

• gpt-image-2/SKILL.md
• references/prompt-writing.md
• references/portraits-and-characters/professional-portrait.md
• references/portraits-and-characters/character-sheet.md
• references/portraits-and-characters/pose-reference-sheet.md
• references/storyboards-and-sequences/cinematic-storyboard-grid.md
• references/scenes-and-illustrations/concept-scene.md
• references/slides-and-visual-docs/dense-explainer-slides.md

Files

• mode-check.json: local mode detection result.
• cases.md: test cases and expected prompt risks.
• outputs/direct-prompts.md: baseline direct prompts.
• outputs/advisor-prompts.md: Advisor-style prompts.
• comparison.md: rubric, scores, and conclusion.

Directory Decision For Future Work

This investigation uses a root-level investigations/ directory because it is validating an assumption, not running a production project or automated test suite.

If this premise is accepted, stable workflow documentation should move into docs/. Project-specific outputs should remain under projects/<project-id>/.

For projects with recurring human character imagery, this investigation supports adding:

projects/<project-id>/makeup-still/

Use it only when a project has a character / human identity package. It should hold makeup-still prompts, generated or externally produced makeup-still images, reference-role notes, and acceptance records. Projects without visible characters do not need this folder.