# shapely-compute

Runs computational geometry with Shapely: builds shapes, checks spatial predicates, and measures areas directly from your coding agent.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 495 installs · ★ 3946
- Author: parcadei
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/parcadei/Continuous-Claude-v3/tree/HEAD/.claude/skills/shapely-compute/SKILL.md
- Updated: 2026-01-26
- HTML: https://affpapa.org/en/nevibecode/skills/shapely-compute

## What it does

This skill gives your agent a dedicated CLI toolset for 2D computational geometry powered by Shapely. It creates points, lines, and polygons from raw coordinates or WKT strings. The tool handles boolean operations like intersections and unions, evaluates spatial predicates such as `contains` or `within`, and extracts centroids or bounding boxes.

Each operation runs via `uv run python scripts/shapely_compute.py`. You need the `uv` runner and the local Python script present in your project. Without this setup, commands will fail. If invalid shapes with self-intersections occur, the `makevalid` command repairs the geometry automatically.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add parcadei/Continuous-Claude-v3 --skill shapely-compute -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/shapely-compute/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/shapely-compute/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add parcadei/Continuous-Claude-v3 --skill shapely-compute -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/shapely-compute/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add parcadei/Continuous-Claude-v3 --skill shapely-compute -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/shapely-compute/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install parcadei/Continuous-Claude-v3 shapely-compute
```

2. **Manually: put the files in place**
- File: `.github/skills/shapely-compute/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add parcadei/Continuous-Claude-v3 --skill shapely-compute -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/parcadei/Continuous-Claude-v3 --path .claude/skills/shapely-compute
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/shapely-compute/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add parcadei/Continuous-Claude-v3 --skill shapely-compute -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/parcadei/Continuous-Claude-v3/tree/HEAD/.claude/skills/shapely-compute/SKILL.md

## When to use it
- Calculate intersections or differences between geometric shapes
- Check whether a point lies within a polygon boundary
- Measure polygon areas, perimeters, and centroids
- Repair self-intersecting or invalid geometries using makevalid

## Example prompts
- Calculate the area of a polygon with coords 0,0 1,0 1,1 0,1 using shapely-compute
- Check if this point is inside the polygon using shapely-compute predicates
- Fix self-intersections in this geometry using makevalid

## Source text · SKILL.md · MIT

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BEGIN THIRD-PARTY FILE dad8c4bbce2681de
````text
---
name: shapely-compute
description: Computational geometry with Shapely - create geometries, boolean operations, measurements, predicates
triggers: ["geometry", "polygon", "intersection", "area", "contains", "distance between points", "buffer", "convex hull", "centroid", "WKT"]
---

# Computational Geometry with Shapely

## When to Use
- Creating geometric shapes (points, lines, polygons)
- Boolean operations (intersection, union, difference)
- Spatial predicates (contains, intersects, within)
- Measurements (area, length, distance, centroid)
- Geometry transformations (translate, rotate, scale)
- Validating and fixing invalid geometries

## Quick Reference

| I want to... | Command | Example |
|--------------|---------|---------|
| Create geometry | `create` | `create polygon --coords "0,0 1,0 1,1 0,1"` |
| Intersection | `op intersection` | `op intersection --g1 "POLYGON(...)" --g2 "POLYGON(...)"` |
| Check contains | `pred contains` | `pred contains --g1 "POLYGON(...)" --g2 "POINT(0.5 0.5)"` |
| Calculate area | `measure area` | `measure area --geom "POLYGON(...)"` |
| Distance | `distance` | `distance --g1 "POINT(0 0)" --g2 "POINT(3 4)"` |
| Transform | `transform translate` | `transform translate --geom "..." --params "1,2"` |
| Validate | `validate` | `validate --geom "POLYGON(...)"` |

## Commands

### create
Create geometric objects from coordinates.
```bash
# Point
uv run python scripts/shapely_compute.py create point --coords "1,2"

# Line (2+ points)
uv run python scripts/shapely_compute.py create line --coords "0,0 1,1 2,0"

# Polygon (3+ points, auto-closes)
uv run python scripts/shapely_compute.py create polygon --coords "0,0 1,0 1,1 0,1"

# Polygon with hole
uv run python scripts/shapely_compute.py create polygon --coords "0,0 10,0 10,10 0,10" --holes "2,2 8,2 8,8 2,8"

# MultiPoint
uv run python scripts/shapely_compute.py create multipoint --coords "0,0 1,1 2,2"

# MultiLineString (pipe-separated lines)
uv run python scripts/shapely_compute.py create multilinestring --coords "0,0 1,1|2,2 3,3"

# MultiPolygon (pipe-separated polygons)
uv run python scripts/shapely_compute.py create multipolygon --coords "0,0 1,0 1,1 0,1|2,2 3,2 3,3 2,3"
```

### op (operations)
Boolean geometry operations.
```bash
# Intersection of two polygons
uv run python scripts/shapely_compute.py op intersection \
    --g1 "POLYGON((0 0,2 0,2 2,0 2,0 0))" \
    --g2 "POLYGON((1 1,3 1,3 3,1 3,1 1))"

# Union
uv run python scripts/shapely_compute.py op union --g1 "POLYGON(...)" --g2 "POLYGON(...)"

# Difference (g1 - g2)
uv run python scripts/shapely_compute.py op difference --g1 "POLYGON(...)" --g2 "POLYGON(...)"

# Symmetric difference (XOR)
uv run python scripts/shapely_compute.py op symmetric_difference --g1 "..." --g2 "..."

# Buffer (expand/erode)
uv run python scripts/shapely_compute.py op buffer --g1 "POINT(0 0)" --g2 "1.5"

# Convex hull
uv run python scripts/shapely_compute.py op convex_hull --g1 "MULTIPOINT((0 0),(1 1),(0 2),(2 0))"

# Envelope (bounding box)
````
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