Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Impertio-Studio/QGIS-Claude-Skill-Package --skill qgis-impl-vector-analysisgit clone --depth 1 https://github.com/Impertio-Studio/QGIS-Claude-Skill-PackageWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/impertio-studio/qgis-claude-skill-package/qgis-impl-vector-analysis)<a href="https://agentmods.dev/skills/impertio-studio/qgis-claude-skill-package/qgis-impl-vector-analysis"><img src="https://agentmods.dev/badge/skills/impertio-studio/qgis-claude-skill-package/qgis-impl-vector-analysis/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/impertio-studio/qgis-claude-skill-package/qgis-impl-vector-analysis"><img src="https://agentmods.dev/badge/skills/impertio-studio/qgis-claude-skill-package/qgis-impl-vector-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00101 | $0.02803 |
| Opus 5 | $0.00051 | $0.01401 |
| Sonnet 5 | $0.00020 | $0.00561 |
| Haiku 4.5 | $0.00010 | $0.00280 |
Grade A, and why
qgis-impl-vector-analysis scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 366 lines — stays where its author put it; the contents beside it link to each section on GitHub.
qgis-impl-vector-analysis
Quick Reference
Core Classes
| Class | Purpose | Import |
|---|---|---|
QgsFeatureRequest |
Filter features by rect, expression, or FID | qgis.core |
QgsSpatialIndex |
In-memory R-tree for fast spatial lookups | qgis.core |
QgsGeometry |
Geometry operations (buffer, intersects, contains) | qgis.core |
QgsVectorFileWriter |
Write vector layers to disk (GPKG, SHP, GeoJSON) | qgis.core |
QgsCoordinateTransformContext |
CRS transformation context for output | qgis.core |
processing |
Run QGIS Processing algorithms | import processing |
Key Processing Algorithm IDs
| Algorithm | Purpose |
|---|---|
native:buffer |
Create buffer zones around features |
native:clip |
Clip input layer by overlay layer |
native:intersection |
Geometric intersection of two layers |
native:union |
Geometric union of two layers |
native:difference |
Geometric difference (A minus B) |
native:symmetricaldifference |
Features in A or B but not both |
native:dissolve |
Merge features by attribute value |
native:joinattributestable |
Join attributes by matching field values |
native:joinattributesbylocation |
Spatial join based on geometry relationship |
native:extractbyexpression |
Extract features matching expression |
native:extractbylocation |
Extract features by spatial relationship |
native:fieldcalculator |
Calculate field values with expressions |
Critical Warnings
NEVER pass layers with different CRS to overlay operations without reprojecting first. Processing algorithms reproject automatically, but PyQGIS geometry methods do NOT. ALWAYS verify CRS match before direct QgsGeometry operations.
NEVER call QgsGeometry methods on NULL geometries. ALWAYS check feature.hasGeometry() before ANY geometry operation. NULL geometries cause silent failures or crashes.
NEVER forget to call del writer after using QgsVectorFileWriter.create(). The file is NOT written to disk until the writer object is destroyed.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 366 lines · 101 tokens per session scan A 4264af609b49
qgis-impl-vector-analysis is a skill published in the GitHub repository Impertio-Studio/QGIS-Claude-Skill-Package (33 stars, last pushed 2mo ago), licensed MIT. It adds 101 tokens to every session and 2,803 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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