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Security Ownership Map

OpenAIOfficialPublished by OpenAI

  • Skill
  • Research and analysis
  • Security
  • Apache-2.0
  • Low risk
  • Has scripts

From the author

Analyze git repositories to build a security ownership topology (people-to-file), compute bus factor and sensitive-code ownership, and export CSV/JSON for graph databases and visualization. Trigger only when the user explicitly wants a security-oriented ownership or bus-factor analysis grounded in git history (for example: orphaned sensitive code, security maintainers, CODEOWNERS reality checks for risk, sensitive hotspots, or ownership clusters). Do not trigger for general maintainer lists or non-security ownership questions.
— the description by OpenAI

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

The Security Ownership Map skill analyzes git repository history to build a bipartite graph of people and files. It calculates ownership metrics, such as bus factor and sensitive code exposure, and identifies clusters of files that frequently change together. The tool generates structured data (CSV/JSON) suitable for graph databases like Neo4j or visualization tools like Gephi, enabling security teams to audit ownership, validate CODEOWNERS files, and identify high-risk, low-bus-factor areas in the codebase.

What it does

  • Builds a bipartite graph of contributors and files from git history.
  • Computes bus factor and ownership risk for sensitive code paths.
  • Clusters files based on co-change patterns to identify functional dependencies.
  • Exports data to CSV and JSON formats for graph database ingestion.
  • Identifies orphaned sensitive code and hidden ownership concentrations.
  • Provides CLI tools to query specific ownership slices and security findings.

When to use it

  • When you need to audit the security ownership of sensitive codebases.
  • When identifying 'bus factor' risks where critical code is maintained by too few people.
  • When verifying if actual code contributions align with defined CODEOWNERS files.
  • When investigating ownership drift or identifying orphaned security-sensitive components.
  • When preparing data for graph-based visualization of developer-to-file relationships.

Advantages

  • Grounded in actual git history rather than static documentation.
  • Supports custom sensitivity rules to prioritize specific file patterns.
  • Provides actionable insights like orphaned code and bus factor hotspots.
  • Integrates with graph databases for advanced network analysis.
  • Configurable filtering to exclude noise like bots or infrastructure glue files.

Usage examples

“Analyze the current repository to find sensitive files with a bus factor of 1 or less.”
The tool generates a report identifying critical auth or crypto files that are maintained by only one person, highlighting potential knowledge silos.
“Identify orphaned sensitive code in the project.”
The tool outputs a list of sensitive files that have not been touched recently and have a low bus factor, flagging them for review.
“Who are the top contributors touching the crypto directory?”
The tool queries the ownership map to return a list of developers ranked by their contribution volume to files tagged as crypto.
“Find hidden owners for sensitive code.”
The tool identifies individuals who control a significant percentage of sensitive code, even if they are not explicitly listed as maintainers.

Install

  1. Download the skill as a ZIP:

    https://mp-staging.autogineer.com/agent-skills/openai/security-ownership-map/download
  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip security-ownership-map.zip -d .agents/skills

Documentation by OpenAI

Security Ownership Map

Overview

Build a bipartite graph of people and files from git history, then compute ownership risk and export graph artifacts for Neo4j/Gephi. Also build a file co-change graph (Jaccard similarity on shared commits) to cluster files by how they move together while ignoring large, noisy commits.

Requirements

  • Python 3

  • networkx (required; community detection is enabled by default)

Install with:

pip install networkx

Workflow

  1. Scope the repo and time window (optional --since/--until).

  2. Decide sensitivity rules (use defaults or provide a CSV config).

  3. Build the ownership map with scripts/run_ownership_map.py (co-change graph is on by default; use --cochange-max-files to ignore supernode commits).

  4. Communities are computed by default; graphml output is optional (--graphml).

  5. Query the outputs with scripts/query_ownership.py for bounded JSON slices.

  6. Persist and visualize (see references/neo4j-import.md).

By default, the co-change graph ignores common “glue” files (lockfiles, .github/*, editor config) so clusters reflect actual code movement instead of shared infra edits. Override with --cochange-exclude or --no-default-cochange-excludes. Dependabot commits are excluded by default; override with --no-default-author-excludes or add patterns via --author-exclude-regex.

If you want to exclude Linux build glue like Kbuild from co-change clustering, pass:

python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo /path/to/linux \
  --out ownership-map-out \
  --cochange-exclude "**/Kbuild"

Quick start

Run from the repo root:

python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo . \
  --out ownership-map-out \
  --since "12 months ago" \
  --emit-commits

Defaults: author identity, author date, and merge commits excluded. Use --identity committer, --date-field committer, or --include-merges if needed.

Example (override co-change excludes):

python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo . \
  --out ownership-map-out \
  --cochange-exclude "**/Cargo.lock" \
  --cochange-exclude "**/.github/**" \
  --no-default-cochange-excludes

Communities are computed by default. To disable:

python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo . \
  --out ownership-map-out \
  --no-communities

Sensitivity rules

By default, the script flags common auth/crypto/secret paths. Override by providing a CSV file:

# pattern,tag,weight
**/auth/**,auth,1.0
**/crypto/**,crypto,1.0
**/*.pem,secrets,1.0

Use it with --sensitive-config path/to/sensitive.csv.

Output artifacts

ownership-map-out/ contains:

  • people.csv (nodes: people)

  • files.csv (nodes: files)

  • edges.csv (edges: touches)

  • cochange_edges.csv (file-to-file co-change edges with Jaccard weight; omitted with --no-cochange)

  • summary.json (security ownership findings)

  • commits.jsonl (optional, if --emit-commits)

  • communities.json (computed by default from co-change edges when available; includes maintainers per community; disable with --no-communities)

  • cochange.graph.json (NetworkX node-link JSON with community_id + community_maintainers; falls back to ownership.graph.json if no co-change edges)

  • ownership.graphml / cochange.graphml (optional, if --graphml)

people.csv includes timezone detection based on author commit offsets: primary_tz_offset, primary_tz_minutes, and timezone_offsets.

LLM query helper

Use scripts/query_ownership.py to return small, JSON-bounded slices without loading the full graph into context.

Examples:

python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out people --limit 10
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out files --tag auth --bus-factor-max 1
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out person --person alice@corp --limit 10
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out file --file crypto/tls
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out cochange --file crypto/tls --limit 10
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section orphaned_sensitive_code
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out community --id 3

Use --community-top-owners 5 (default) to control how many maintainers are stored per community.

Basic security queries

Run these to answer common security ownership questions with bounded output:

# Orphaned sensitive code (stale + low bus factor)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section orphaned_sensitive_code

# Hidden owners for sensitive tags
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section hidden_owners

# Sensitive hotspots with low bus factor
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section bus_factor_hotspots

# Auth/crypto files with bus factor <= 1
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out files --tag auth --bus-factor-max 1
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out files --tag crypto --bus-factor-max 1

# Who is touching sensitive code the most
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out people --sort sensitive_touches --limit 10

# Co-change neighbors (cluster hints for ownership drift)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out cochange --file path/to/file --min-jaccard 0.05 --limit 20

# Community maintainers (for a cluster)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out community --id 3

# Monthly maintainers for the community containing a file
python skills/skills/security-ownership-map/scripts/community_maintainers.py \
  --data-dir ownership-map-out \
  --file network/card.c \
  --since 2025-01-01 \
  --top 5

# Quarterly buckets instead of monthly
python skills/skills/security-ownership-map/scripts/community_maintainers.py \
  --data-dir ownership-map-out \
  --file network/card.c \
  --since 2025-01-01 \
  --bucket quarter \
  --top 5

Notes:

  • Touches default to one authored commit (not per-file). Use --touch-mode file to count per-file touches.

  • Use --window-days 90 or --weight recency --half-life-days 180 to smooth churn.

  • Filter bots with --ignore-author-regex '(bot|dependabot)'.

  • Use --min-share 0.1 to show stable maintainers only.

  • Use --bucket quarter for calendar quarter groupings.

  • Use --identity committer or --date-field committer to switch from author attribution.

  • Use --include-merges to include merge commits (excluded by default).

Summary format (default)

Use this structure, add fields if needed:

{
  "orphaned_sensitive_code": [
    {
      "path": "crypto/tls/handshake.rs",
      "last_security_touch": "2023-03-12T18:10:04+00:00",
      "bus_factor": 1
    }
  ],
  "hidden_owners": [
    {
      "person": "alice@corp",
      "controls": "63% of auth code"
    }
  ]
}

Graph persistence

Use references/neo4j-import.md when you need to load the CSVs into Neo4j. It includes constraints, import Cypher, and visualization tips.

Notes

  • bus_factor_hotspots in summary.json lists sensitive files with low bus factor; orphaned_sensitive_code is the stale subset.

  • If git log is too large, narrow with --since or --until.

  • Compare summary.json against CODEOWNERS to highlight ownership drift.

Files

LICENSE.txt

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Requirements and compatibility

Written for: OpenAI Codex

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs Python, Needs Node.js

Security

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Attribution and licence

Published by
OpenAI
Publisher
OpenAI (Official)
Source
openai/skills · skills/.curated/security-ownership-map · commit 49f948f
Licence
Apache License 2.0 (redistribution allowed)
  • ATTRIBUTION.md (written by AutoGineer)
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