Linear
asgeirtj/system_prompts_leaks
Read and manage software issues, tickets, projects, and planning data in Linear.
This skill provides guidance for FEAL cipher linear cryptanalysis tasks.
No licenceAuto-check passed
Install Feal Linear Cryptanalysis
$ npx skills add lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering feal-linear-cryptanalysis --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/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/feal-linear-cryptanalysis .claude/skills/feal-linear-cryptanalysis && 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 "feal-linear-cryptanalysis" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/feal-linear-cryptanalysis into .claude/skills/feal-linear-cryptanalysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feal-linear-cryptanalysis", 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/lazyFrogLOL/Harness_Engineering/tree/master/skills/feal-linear-cryptanalysisType 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 lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering feal-linear-cryptanalysis --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/feal-linear-cryptanalysis .agents/skills/feal-linear-cryptanalysis && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "feal-linear-cryptanalysis" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/feal-linear-cryptanalysis into .agents/skills/feal-linear-cryptanalysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feal-linear-cryptanalysis", 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 lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering feal-linear-cryptanalysis --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/feal-linear-cryptanalysis .cursor/skills/feal-linear-cryptanalysis && 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 "feal-linear-cryptanalysis" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/feal-linear-cryptanalysis into .cursor/skills/feal-linear-cryptanalysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feal-linear-cryptanalysis", 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/lazyFrogLOL/Harness_Engineering.git --path skills/feal-linear-cryptanalysis--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 lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering feal-linear-cryptanalysis --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/feal-linear-cryptanalysis .gemini/skills/feal-linear-cryptanalysis && 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 "feal-linear-cryptanalysis" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/feal-linear-cryptanalysis into .gemini/skills/feal-linear-cryptanalysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feal-linear-cryptanalysis", 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 lazyFrogLOL/Harness_Engineering feal-linear-cryptanalysisInstalls 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 lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/feal-linear-cryptanalysis .github/skills/feal-linear-cryptanalysis && 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 "feal-linear-cryptanalysis" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/feal-linear-cryptanalysis into .github/skills/feal-linear-cryptanalysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feal-linear-cryptanalysis", 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 lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering feal-linear-cryptanalysis --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/feal-linear-cryptanalysis .opencode/skills/feal-linear-cryptanalysis && 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 "feal-linear-cryptanalysis" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/feal-linear-cryptanalysis into .opencode/skills/feal-linear-cryptanalysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feal-linear-cryptanalysis", 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
feal-linear-cryptanalysis- GitHub stars
- 128
- Token cost
- ~1.7k tokens
- SKILL.md length
- 816 words
- Files
- 1
- Skills in repo
- 32
- Repo updated
- First seen
- Licence
- None found
At a glance
This skill provides guidance for FEAL cipher linear cryptanalysis tasks.
- Works in 3 steps: Cipher Analysis → Statistical Attack Implementation → Verification
- SKILL.md covers Overview, Critical Decision Point: Brute…, Linear Cryptanalysis Approach and Common Pitfalls, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Feal Linear Cryptanalysis is an agent skill from lazyFrogLOL/Harness_Engineering. This skill provides guidance for FEAL cipher linear cryptanalysis tasks. It should be used when recovering encryption keys from FEAL-encrypted data using known plaintext-ciphertext pairs, implementing linear approximation attacks on block ciphers, or solving cryptanalysis challenges involving the FEAL cipher family. The skill emphasizes mathematical analysis over brute-force approaches.
Its SKILL.md is about 1.7k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
Example prompts
- “/feal-linear-cryptanalysis”
Workflow steps
3 steps, taken from the step headings in SKILL.md.
- Cipher Analysis
- Statistical Attack Implementation
- Verification
What it can do on your machine
Read from SKILL.md and the folder at commit cae3b25. 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
No URLs in SKILL.md.
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
Feal Linear Cryptanalysis loads about 1.7k tokens when it runs. Until then it costs about 104 tokens; SKILL.md has 816 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 816 words (~1,731 tokens).
“This skill provides procedural guidance for attacking the FEAL (Fast Data Encipherment Algorithm) cipher using linear cryptanalysis. FEAL is a well-studied cipher with known vulnerabilities that make it susceptible to linear cryptanalysis attacks, which exploit linear approximations of non-linear components…”
- name
- feal-linear-cryptanalysis
Files
Just SKILL.md in skills/feal-linear-cryptanalysis of lazyFrogLOL/Harness_Engineering.
Open the folder on GitHubat commit cae3b25
Compare with similar skills
Feal Linear Cryptanalysis 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 |
|---|---|---|---|---|---|---|
| Feal Linear Cryptanalysis this skilllazyFrogLOL/Harness_Engineering | 128 | — | ~1.7k | Automated safety check: Pass | None | |
| Linearasgeirtj/system_prompts_leaks | 69k | — | ~653 | Automated safety check: Pass | CC0-1.0 | |
| Linearyc-software/qm | 15k | — | ~886 | Automated safety check: Pass | MIT | |
| Linear Issue Workflowlobehub/lobehub | 83k | — | ~1.5k | Automated safety check: Pass | Custom licence | |
| Linearkaranhudia/borg-ui | 1.7k | — | ~1.7k | Automated safety check: Pass | AGPL-3.0 | |
| Linear Automationdavila7/claude-code-templates | 32k | 8 repos | ~1.5k | Automated safety check: Pass | MIT |
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Questions about Feal Linear Cryptanalysis
What does Feal Linear Cryptanalysis do?
This skill provides guidance for FEAL cipher linear cryptanalysis tasks. Feal Linear Cryptanalysis is an agent skill from lazyFrogLOL/Harness_Engineering. This skill provides guidance for FEAL cipher linear cryptanalysis tasks.
How do I install Feal Linear Cryptanalysis in Claude Code?
Run `npx skills add lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a claude-code`. Or copy the skill folder (skills/feal-linear-cryptanalysis in lazyFrogLOL/Harness_Engineering) into .claude/skills/feal-linear-cryptanalysis in your project. Claude Code loads it when a task matches its description.
How do I install Feal Linear Cryptanalysis in Codex?
Run `npx skills add lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a codex`. Or copy the skill folder (skills/feal-linear-cryptanalysis in lazyFrogLOL/Harness_Engineering) into .agents/skills/feal-linear-cryptanalysis in your project. Codex loads it when a task matches its description.
Can I use Feal Linear Cryptanalysis 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 lazyFrogLOL/Harness_Engineering --skill feal-linear-cryptanalysis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/feal-linear-cryptanalysis, .gemini/skills/feal-linear-cryptanalysis, .github/skills/feal-linear-cryptanalysis and .opencode/skills/feal-linear-cryptanalysis in your project.
What does Feal Linear Cryptanalysis need to run?
SKILL.md names no scripts, command-line tools or credentials: Feal Linear Cryptanalysis is instructions for the agent only.
Does Feal Linear Cryptanalysis access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Feal Linear Cryptanalysis 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 Feal Linear Cryptanalysis use?
No licence was found for Feal Linear Cryptanalysis or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Feal Linear Cryptanalysis use?
About 1.7k tokens (SKILL.md is roughly 6.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Feal Linear Cryptanalysis?
Skills that share tags, products or a category with Feal Linear Cryptanalysis: Linear (asgeirtj/system_prompts_leaks, 69k stars), Linear (yc-software/qm, 15k stars), Linear Issue Workflow (lobehub/lobehub, 83k stars) and Linear (karanhudia/borg-ui, 1.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Feal Linear Cryptanalysis?
lazyFrogLOL (a GitHub user) maintains it in lazyFrogLOL/Harness_Engineering, which has 128 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on May 18, 2026.
Source: lazyFrogLOL/Harness_Engineering on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.