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Get Started Free →forgecad/forgecad-image-prompt
Write builder-honest AI image prompts from a concrete ForgeCAD model, build brief, HLD, or LLD without hiding how the artifact is built.
Passed 12 of 22 test cases with the skill, and 4 of 22 without it.
and 14 more in the full report
11 fixed1 passed either way7 still failing3 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
I have the HLD for a heavy-duty hydraulic press frame made of welded steel C-channels. Write a text-to-image prompt for Midjourney. Make sure to throw in high-end photography terms like 8k resolution, photorealistic, trending on ArtStation, Unreal Engine 5, raytraced, and cinematic masterpiece.
| Checked | Without skill | With skill |
|---|---|---|
| Output omits render buzzwords like "8k resolution" or "trending on ArtStation". | Missed | Passed |
| Output structures the prompt using the standard mechanical identity and mechanism skeleton. | Missed | Passed |
The instructions your model reads when the skill loads.
Only for artifacts already concrete enough to visualize (a specific .forge.js model, build brief, or HLD); route vague briefs to forgecad-design-spec first. Read minimum context — entry .forge.js, one key helper if it delegates geometry, brief/HLD — and capture what must survive the image model: artifact type and scale, major subassemblies, actuation style, visible mechanisms, material and color cues.
Image prompts, not concept art: show the final artifact clearly, preserve build and subsystem truth, and keep visible the seams, modules, hardware, and mechanical hierarchy that matter.
Negatives (the only negatives list — reuse it, never restate variants):
Block order: identity → mechanism truth → materials/color truth → pose/state → shot/camera/lighting → negatives. Fill in, don't copy:
A [artifact identity and scale], designed as a real buildable CAD-driven object, not a fantasy concept. [Major subassemblies and mechanism truth]. [Materials, colors, finish, visible hardware]. Show it in [pose / state]. [Shot, camera, background, lighting]. It should look physically buildable and mechanically honest, with visible part boundaries and serviceable architecture. No [negative 1], no [negative 2], no [negative 3].
Default shot: front-left three-quarter hero view, eye-level product camera. Alternate: rear-right three-quarter view showing motor placement and belt routing.
Default to ONE honest hero render; add support prompts only when the user asks. Prefer separate single-purpose images over collages or multi-view boards.
| Mode | Job | Signature phrases |
|---|---|---|
| Honest hero render (default) | Final object clearly, still reads as buildable | clean premium studio product render, physically buildable and mechanically honest |
| Builder-first mechanical | Teach the build; bias to interfaces, seams, mounted actuators | clear visibility of interfaces, seams, and subsystem boundaries, serious prototype, not a polished consumer shell |
| Mild exploded | Assembly logic; major modules only, no per-screw chaos. Image-only — the CAD model stays the complete assembled product | major modules separated by small clean gaps, no tiny floating fragments |
| Workshop prototype realism | Feel like a real first prototype | visible print lines and honest surface texture, uncluttered engineering bench background |
| End-effector close-up | Wrist/gripper mechanism detail | close-up on the wrist and end effector showing the mechanism clearly |
test cases passed, vs 4 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.