Enclosure

What the source does

• FilesystemNone observedNo reads or writes in the source
• NetworkNone observedNo outbound calls in the source
• ShellNone observedNo commands run in the source
• DependenciesPinnedNothing floats
• SecretsNone foundNo keys in source

Five audit layers

Gates applied: no behavioural pass.

Audit 0.4.1 · source sha 24034f36bad7 · 19 Oct 2026Report an issue or request a re-scan

• Publisherghbalf GitHub userOwner of the repository this skill is read from
• Source folderghbalf/freecad-ai/skills/enclosureThe exact folder we audited
• LicenceLGPL-2.1As the repository states it
• Commit pinned for this verdict24034f36bad7A new audit runs when the source changes
• Repository statusNot archivedLast push 2 days ago
• Sandboxed runNot runSkills are read, not executed; layer L4 is skipped

Its description: Generate a parametric electronics enclosure with a base and lid.

---
name: enclosure
description: "Generate a parametric electronics enclosure with a base and lid."
---

# Enclosure Generator

Generate a parametric electronics enclosure with a base and lid.

## Parameters to extract from user request
- **L, W, H**: outer length, width, height in mm
- **T**: wall thickness (default 2mm)
- **Lid type**: "screw" (default), "press-fit" (lip only), or "snap-fit" (lip + ridge + snap tabs)
- **Post radius**: screw post outer radius (default 3mm) — only for screw lid
- **Screw size**: M3 by default (hole r=1.5mm, clearance r=1.75mm) — only for screw lid

## Construction steps (use these exact dimensions)

Variables: L=length, W=width, H=height, T=wall_thickness, PR=post_radius (3mm)

### 1. Base body
- `create_body` label="EnclosureBase"

### 2. Outer shell
- `create_sketch` on XY, body_name="EnclosureBase": rectangle x=0, y=0, width=L, height=W
- `pad_sketch` length=**H**, body_name="EnclosureBase"

### 3. Interior pocket (from the TOP face)
- `create_sketch` on XY, **offset=H**, body_name="EnclosureBase": rectangle x=T, y=T, width=L-2*T, height=W-2*T
- `pocket_sketch` length=**H-T**, body_name="EnclosureBase"
- This creates the hollow from z=T to z=H (floor thickness=T at bottom, open at top)

### 4–5. Screw posts and holes (SCREW LID ONLY — skip for snap-fit)
Post centers must be far enough from walls so they don't protrude:
- Center X positions: T+PR (left), L-T-PR (right)
- Center Y positions: T+PR (front), W-T-PR (back)

**Step 4: Screw posts** (start from top of floor, not bottom)
- `create_sketch` on XY, **offset=T**, body_name="EnclosureBase": 4 circles at those positions, radius=PR
- `pad_sketch` length=**H-T**, body_name="EnclosureBase"

**Step 5: Screw holes in posts** — MUST complete BEFORE moving to step 6!
- `create_sketch` on XY, **offset=H**, body_name="EnclosureBase": 4 circles at same centers, radius=1.5 (M3)
- `pocket_sketch` length=**H-T**, body_name="EnclosureBase"
- The holes go H-T deep (through the posts only, NOT through the floor)

### 6. Lid body

**For SCREW lid:**
- `create_body` label="EnclosureLid"
- `create_sketch` on XY, body_name="EnclosureLid": rectangle x=0, y=0, width=L, height=W
- `pad_sketch` length=**T**, body_name="EnclosureLid"

**For PRESS-FIT lid** (build lip first, then slab on top so lip points downward):
- `create_body` label="EnclosureLid"
- `create_sketch` on XY, body_name="EnclosureLid": rectangle x=T+0.2, y=T+0.2, width=L-2*T-0.4, height=W-2*T-0.4
- `pad_sketch` length=**3** (3mm lip), body_name="EnclosureLid"
- `create_sketch` on XY, **offset=3**, body_name="EnclosureLid": rectangle x=0, y=0, width=L, height=W
- `pad_sketch` length=**T**, body_name="EnclosureLid"
- The 0.2mm gap on each side provides clearance for a friction fit.

**For SNAP-FIT lid** (same structure, but 1mm clearance so snap tabs have room):
- `create_body` label="EnclosureLid"
- `create_sketch` on XY, body_name="EnclosureLid": rectangle x=T+1, y=T+1, width=L-2*T-2, height=W-2*T-2
- `pad_sketch` length=**3** (3mm lip), body_name="EnclosureLid"
- `create_sketch` on XY, **offset=3**, body_name="EnclosureLid": rectangle x=0, y=0, width=L, height=W
- `pad_sketch` length=**T**, body_name="EnclosureLid"
- The 1mm gap on each side provides room for the snap tabs (0.5mm protrusion).

For both: Lip: z=0→3, Slab: z=3→3+T. After positioning, the lip hangs into the base.

### 7. Lid holes (SCREW LID ONLY — skip for press-fit and snap-fit)
- `create_sketch` on XY, body_name="EnclosureLid": 4 circles at same post centers, radius=1.75
- `pocket_sketch` through_all=true, body_name="EnclosureLid"

### 8. Position lid (BEFORE snap tabs so the shape is in the right place)
- **Screw lid**: `transform_object` EnclosureLid, translate_z=**H**
- **Press-fit lid**: `transform_object` EnclosureLid, translate_z=**H-3**
- **Snap-fit lid**: `transform_object` EnclosureLid, translate_z=**H-3**

### 9. Snap-fit ridge and tabs (SNAP-FIT ONLY — skip for screw and press-fit)
Add a ridge on the base interior and snap tabs on the lid lip.
The snap tabs tool copies the lid's shape (including its position), so the lid MUST be positioned first in step 8.
- `create_inner_ridge` body_name="EnclosureBase", length=L, width=W, wall_thickness=T, ridge_width=0.8, ridge_height=0.5, z_position=**H-2**
- `create_snap_tabs` body_name="EnclosureLid", length=L, width=W, wall_thickness=T, clearance=1.0, lip_height=3

### 10. Hide sketches
Use `execute_code` to hide all sketches at once:
```python
for obj in App.ActiveDocument.Objects:
    if obj.TypeId == "Sketcher::SketchObject":
        obj.Visibility = False
```

## Critical rules
- ALWAYS pass explicit `length` to pad_sketch — never rely on the 10mm default
- ALWAYS pass `body_name` to pad_sketch and pocket_sketch — this ensures features go into the correct body
- Screw posts go INSIDE the enclosure at positions (T+PR, T+PR) from each corner — never at the wall edge
- All sketches on XY plane, attached to the correct body_name
- The base height is H, pocket depth is H-T, post height is H-T
- Use **offset=H** for the pocket sketch so it is placed at the top face (creates correct floor-at-bottom orientation)
- **Complete ALL steps for the base (1–5) before starting the lid (step 6)**. Each create_sketch MUST be followed by its pad_sketch or pocket_sketch before creating the next sketch.
- **Screw lid** (default): do steps 4, 5, 7. Skip step 9. Use screw lid variant in step 6.
- **Press-fit lid**: skip steps 4, 5, 7, 9. Use press-fit/snap-fit lid variant in step 6 (lip only, no tabs).
- **Snap-fit lid**: skip steps 4, 5, 7. Use press-fit/snap-fit lid variant in step 6, then do step 9 (ridge + tabs).
- After completing ALL construction steps (including positioning), call the `report_skill_params` **tool** (NOT execute_code) with params={"L": value, "W": value, "H": value, "T": value, "PR": value, "lid_type": "screw/press-fit/snap-fit"}.

Excerpt, first 5,894 characters of SKILL.md, verbatim from the audited commit. It is text from someone else’s repository, quoted so you can judge it before your agent reads it.

git clone https://github.com/ghbalf/freecad-ai
git -C freecad-ai checkout 24034f36bad7

Works in

1. 2026-10-19
   ✓SAFE B 89 / 100

   first audit · source 24034f36bad7

Questions about Enclosure

• github.com/ghbalf/freecad-ai/tree/master/skills/enclosure — the audited source at commit 24034f36bad7 and every finding aboveObserved · 19 Oct 2026

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