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SKILL verified Apache-2.0 Self-run

Majority Minority Change

skill-amkessler-nicar2026-skills-in-codex-claude-majority-minority-change · by amkessler

This skill should be used when users need to analyze county-level racial composition change between two Census snapshots and identify where places crossed a majority-minority threshold.

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Install

$ agentstack add skill-amkessler-nicar2026-skills-in-codex-claude-majority-minority-change

✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

✓ Prompt-injection patterns
✓ Secret / credential exfiltration
✓ Dangerous shell & filesystem operations
✓ Untrusted network calls
✓ Known-malicious package signatures

What it can access

✓ Network access No
✓ Filesystem access No
✓ Shell / process execution No
✓ Environment & secrets No
✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

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About

Majority Minority Change

Use this skill to compare county demographics across two years and flag threshold crossings.

Requirements

R with dplyr, readr, stringr, and jsonlite
Two local CSV files with county identifiers and required race/population fields
Bundled Census CSV snapshots for immediate use:
skills/majority-minority-change/data/county_race_acs5_2010.csv
skills/majority-minority-change/data/county_race_acs5_2020.csv
No API key required

Required Input Columns

Join keys available in both files:
county_fips (preferred), or
both state and county
Metrics in both files:
total_population
non_hispanic_white

Standard Workflow

Confirm start/end files and year labels.

--state accepts full names or USPS abbreviations (for example, Georgia or GA).
Default bundled files:
start: skills/majority-minority-change/data/county_race_acs5_2010.csv
end: skills/majority-minority-change/data/county_race_acs5_2020.csv

Review skills/majority-minority-change/references/DATA_SCHEMA.md for exact derived/output field names before downstream filtering or selecting columns.

Expected output naming includes nonwhite_share_ and delta_nonwhite_share_pp.

Run script with optional state filter.

Example:

Rscript skills/majority-minority-change/scripts/analyze_majority_minority_change.R --input-start skills/majority-minority-change/data/county_race_acs5_2010.csv --input-end skills/majority-minority-change/data/county_race_acs5_2020.csv --start-label 2010 --end-label 2020

Review counties with largest percentage-point shifts and threshold crossings.

Output

Return:

non-white share in each year
percentage-point change
crossed_to_majority_minority
crossed_out_of_majority_minority

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Author: amkessler
Source: amkessler/nicar2026skillsincodex_claude
License: Apache-2.0

Install and usage instructions live in the source repository linked above.

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Versions

v0.1.0 Imported from the upstream source.