Security Compliance
sangrokjung/claude-forge
Guides security professionals in implementing defense-in-depth security architectures, achieving compliance with industry frameworks (SOC2, ISO27001, GDPR, HIPAA), conducting threat modeling and…
Test whether every segmentation and scope-reduction control isolates the cardholder data environment from claimed out-of-scope systems and differing security levels.
Install Test Cardholder Data Segmentation
$ npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install cyberful/cyberful test-cardholder-data-segmentation --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cyberful/builtin/skills/test-cardholder-data-segmentation .claude/skills/test-cardholder-data-segmentation && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "test-cardholder-data-segmentation" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-cardholder-data-segmentation into .claude/skills/test-cardholder-data-segmentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-cardholder-data-segmentation", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-cardholder-data-segmentationType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install cyberful/cyberful test-cardholder-data-segmentation --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .agents/skills && cp -r skills-src/cyberful/builtin/skills/test-cardholder-data-segmentation .agents/skills/test-cardholder-data-segmentation && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "test-cardholder-data-segmentation" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-cardholder-data-segmentation into .agents/skills/test-cardholder-data-segmentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-cardholder-data-segmentation", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install cyberful/cyberful test-cardholder-data-segmentation --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/cyberful/builtin/skills/test-cardholder-data-segmentation .cursor/skills/test-cardholder-data-segmentation && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "test-cardholder-data-segmentation" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-cardholder-data-segmentation into .cursor/skills/test-cardholder-data-segmentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-cardholder-data-segmentation", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/cyberful/cyberful.git --path cyberful/builtin/skills/test-cardholder-data-segmentation--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install cyberful/cyberful test-cardholder-data-segmentation --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/cyberful/builtin/skills/test-cardholder-data-segmentation .gemini/skills/test-cardholder-data-segmentation && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "test-cardholder-data-segmentation" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-cardholder-data-segmentation into .gemini/skills/test-cardholder-data-segmentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-cardholder-data-segmentation", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install cyberful/cyberful test-cardholder-data-segmentationInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .github/skills && cp -r skills-src/cyberful/builtin/skills/test-cardholder-data-segmentation .github/skills/test-cardholder-data-segmentation && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "test-cardholder-data-segmentation" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-cardholder-data-segmentation into .github/skills/test-cardholder-data-segmentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-cardholder-data-segmentation", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install cyberful/cyberful test-cardholder-data-segmentation --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/cyberful/builtin/skills/test-cardholder-data-segmentation .opencode/skills/test-cardholder-data-segmentation && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "test-cardholder-data-segmentation" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-cardholder-data-segmentation into .opencode/skills/test-cardholder-data-segmentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-cardholder-data-segmentation", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
test-cardholder-data-segmentation- GitHub stars
- 135
- Token cost
- ~928 tokens
- SKILL.md length
- 338 words
- Files
- 5 (incl. references, assets)
- Skills in repo
- 85
- Repo updated
- First seen
- Licence
- AGPL-3.0
At a glance
Test whether every segmentation and scope-reduction control isolates the cardholder data environment from claimed out-of-scope systems and differing security levels.
- 11.4.6 segmentation validation after scoping
- SKILL.md covers Establish the tested claims, Exercise each unique isolation…, Interpret and route outcomes and Authoritative anchors
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Control changes
What it does
Test Cardholder Data Segmentation is an agent skill from cyberful/cyberful. Test whether every segmentation and scope-reduction control isolates the cardholder data environment from claimed out-of-scope systems and differing security levels. Use for PCI DSS 11.4.5 or 11.4.6 segmentation validation after scoping or control changes.
Its SKILL.md is about 930 tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files and assets (for example `agents/openai.yaml`, `assets/segmentation-test-matrix.schema.json` and `assets/segmentation-test-matrix.template.json`).
It sits in Legal & Compliance, covering Healthcare and finance regulation. The repository describes itself as: Cyberful is an open-source AI Red Team for discovering, exploiting, verifying, and remediating vulnerabilities. The licence is AGPL-3.0.
When your agent uses it
- 11.4.6 segmentation validation after scoping
- Control changes
Example prompts
- “/test-cardholder-data-segmentation”
What it can do on your machine
Read from SKILL.md and the folder at commit ec598a6. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
docs-prv.pcisecuritystandards.orgpcisecuritystandards.org
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Test Cardholder Data Segmentation loads about 928 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 73 tokens; SKILL.md has 338 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from cyberful/cyberful at commit ec598a6, republished under its AGPL-3.0 licence (© cyberful). 338 words, ~928 tokens.
Download SKILL.mdSave it as
.claude/skills/test-cardholder-data-segmentation/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- test-cardholder-data-segmentation
- description
- Test whether every segmentation and scope-reduction control isolates the cardholder data environment from claimed out-of-scope systems and differing security levels. Use for PCI DSS 11.4.5 or 11.4.6 segmentation validation after scoping or control changes.
- metadata.domain
- payment-security
- metadata.subdomain
- cde-segmentation
- metadata.triggers
- test cardholder data segmentation, pci dss segmentation test, validate cde isolation, pci dss 11.4.5 testing, service provider segmentation testing, scope…
- metadata.tags
- pci-dss, cde, segmentation, isolation, scope-reduction, network-boundary
Test Cardholder Data Segmentation
Test the claim that an out-of-scope component cannot communicate with or impact the security of the CDE even if that component is compromised. A diagram, denied ping, firewall rule, or absence of an observed route is not sufficient by itself.
Establish the tested claims
Read references/segmentation-test-method.md. Begin with the CDE trace, every environment claimed out of scope, every segmentation method in use, differing security levels, third-party and administrative paths, and changes since the last validation.
Use assets/segmentation-test-matrix.template.json under assets/segmentation-test-matrix.schema.json. Each case must name its authorized source vantage, protected destination or capability, isolation method, expected denial invariant, protocol family, evidence, and sampling rationale.
Exercise each unique isolation mechanism
Test from representative out-of-scope networks and systems toward the CDE, not only from the CDE outward. Include permitted intermediaries, shared control planes, identity and management services, name resolution, proxies, load balancers, routing, wireless, remote access, cloud security groups, service meshes, Kubernetes policies, virtualization boundaries, and failover paths where they participate in isolation.
Change one dimension at a time. Distinguish no route, active rejection, application denial, authenticated administrative reach, and an inconclusive timeout. Confirm that alternate protocols, addressing forms, ports, paths, identities, and asynchronous mechanisms do not bypass the intended control.
Use only authorized, bounded Cyberful network and application tools. In Code Audit, inspect policy and construct loopback or disposable-lab cases; do not contact an external target. Do not expand scope or increase effects merely because the test is labeled PCI DSS.
Interpret and route outcomes
If an out-of-scope system reaches or can impact the CDE, preserve the shortest supported path and notify the engagement owner because the PCI DSS scope claim may change. Do not access account data to prove reachability. Route application authorization gaps to test-authorization-boundaries, network enumeration to operate-network-recon, and updated boundaries back to trace-cardholder-data-environment.
Record supported isolation, contradicted isolation, untested mechanism, and evidence gap separately. A technical result supports assessment evidence but does not itself issue a PCI DSS compliance verdict.
Authoritative anchors
- PCI DSS v4.0.1: https://docs-prv.pcisecuritystandards.org/PCI%20DSS/Standard/PCI-DSS-v4_0_1.pdf
- PCI SSC Penetration Testing Guidance v1.1: https://www.pcisecuritystandards.org/documents/Penetration-Testing-Guidance-v1_1.pdf
© cyberful, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (references, assets) in cyberful/builtin/skills/test-cardholder-data-segmentation of cyberful/cyberful.
- SKILL.md
- agents/openai.yaml
- assets/segmentation-test-matrix.schema.json
- assets/segmentation-test-matrix.template.json
- references/segmentation-test-method.md
Open the folder on GitHubat commit ec598a6
Compare with similar skills
Test Cardholder Data Segmentation next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Test Cardholder Data Segmentation this skillcyberful/cyberful | 135 | — | ~928 | Automated safety check: Pass | AGPL-3.0 | |
| Security Compliancesangrokjung/claude-forge | 852 | 2 repos | ~7.2k | Automated safety check: Pass | MIT | |
| Performing Access Recertification With Saviyntmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Implementing Delinea Secret Server For Pammukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~4.3k | Automated safety check: Pass | Apache-2.0 | |
| Implementing Hashicorp Vault Dynamic Secretsmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~5.2k | Automated safety check: Pass | Apache-2.0 | |
| Building Identity Governance Lifecycle Processmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~7.3k | Automated safety check: Pass | Apache-2.0 |
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Related
Categories
Questions about Test Cardholder Data Segmentation
What does Test Cardholder Data Segmentation do?
Test whether every segmentation and scope-reduction control isolates the cardholder data environment from claimed out-of-scope systems and differing security levels. Test Cardholder Data Segmentation is an agent skill from cyberful/cyberful. Test whether every segmentation and scope-reduction control isolates the cardholder data environment from claimed out-of-scope systems and differing security levels.
When should I use Test Cardholder Data Segmentation?
Test Cardholder Data Segmentation fits situations like: 11.4.6 segmentation validation after scoping; control changes.
How do I install Test Cardholder Data Segmentation in Claude Code?
Run `npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a claude-code`. Or copy the skill folder (cyberful/builtin/skills/test-cardholder-data-segmentation in cyberful/cyberful) into .claude/skills/test-cardholder-data-segmentation in your project. Claude Code loads it when a task matches its description.
How do I install Test Cardholder Data Segmentation in Codex?
Run `npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a codex`. Or copy the skill folder (cyberful/builtin/skills/test-cardholder-data-segmentation in cyberful/cyberful) into .agents/skills/test-cardholder-data-segmentation in your project. Codex loads it when a task matches its description.
Can I use Test Cardholder Data Segmentation in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cyberful/cyberful --skill test-cardholder-data-segmentation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-cardholder-data-segmentation, .gemini/skills/test-cardholder-data-segmentation, .github/skills/test-cardholder-data-segmentation and .opencode/skills/test-cardholder-data-segmentation in your project.
What does Test Cardholder Data Segmentation need to run?
SKILL.md names no scripts, command-line tools or credentials: Test Cardholder Data Segmentation is instructions for the agent only.
Does Test Cardholder Data Segmentation access the network?
SKILL.md names 2 domains. As links in the text: docs-prv.pcisecuritystandards.org and pcisecuritystandards.org. This is read from the text; nothing was executed.
Is Test Cardholder Data Segmentation safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Test Cardholder Data Segmentation use?
Test Cardholder Data Segmentation is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Test Cardholder Data Segmentation use?
About 928 tokens (SKILL.md is roughly 3.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 555 tokens, read only when the agent opens those files.
What are the alternatives to Test Cardholder Data Segmentation?
Skills that share tags, products or a category with Test Cardholder Data Segmentation: Security Compliance (sangrokjung/claude-forge, 852 stars), Performing Access Recertification With Saviynt (mukul975/Anthropic-Cybersecurity-Skills, 34k stars), Implementing Delinea Secret Server For Pam (mukul975/Anthropic-Cybersecurity-Skills, 34k stars) and Implementing Hashicorp Vault Dynamic Secrets (mukul975/Anthropic-Cybersecurity-Skills, 34k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Test Cardholder Data Segmentation?
cyberful (a GitHub organization) maintains it in cyberful/cyberful, which has 135 GitHub stars. The repository holds 85 skills in this directory. The repository was last updated on August 24, 2026.
Source: cyberful/cyberful on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.