Semgrep
vigolium/piolium
Run Semgrep static analysis scan on a codebase using parallel subagents.
Tool to get the program slice for a given function using Joern.
Install Joern Slice
$ npx skills add opensage-agent/opensage-adk --skill joern-slice -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install opensage-agent/opensage-adk joern-slice --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/opensage-agent/opensage-adk.git skills-src && mkdir -p .claude/skills && cp -r skills-src/src/opensage/bash_tools/static_analysis/joern-slice .claude/skills/joern-slice && 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 "joern-slice" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/static_analysis/joern-slice into .claude/skills/joern-slice/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "joern-slice", 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/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/static_analysis/joern-sliceType 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 opensage-agent/opensage-adk --skill joern-slice -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install opensage-agent/opensage-adk joern-slice --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .agents/skills && cp -r skills-src/src/opensage/bash_tools/static_analysis/joern-slice .agents/skills/joern-slice && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "joern-slice" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/static_analysis/joern-slice into .agents/skills/joern-slice/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "joern-slice", 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 opensage-agent/opensage-adk --skill joern-slice -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install opensage-agent/opensage-adk joern-slice --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/src/opensage/bash_tools/static_analysis/joern-slice .cursor/skills/joern-slice && 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 "joern-slice" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/static_analysis/joern-slice into .cursor/skills/joern-slice/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "joern-slice", 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/opensage-agent/opensage-adk.git --path src/opensage/bash_tools/static_analysis/joern-slice--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 opensage-agent/opensage-adk --skill joern-slice -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install opensage-agent/opensage-adk joern-slice --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/src/opensage/bash_tools/static_analysis/joern-slice .gemini/skills/joern-slice && 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 "joern-slice" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/static_analysis/joern-slice into .gemini/skills/joern-slice/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "joern-slice", 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 opensage-agent/opensage-adk joern-sliceInstalls 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 opensage-agent/opensage-adk --skill joern-slice -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .github/skills && cp -r skills-src/src/opensage/bash_tools/static_analysis/joern-slice .github/skills/joern-slice && 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 "joern-slice" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/static_analysis/joern-slice into .github/skills/joern-slice/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "joern-slice", 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 opensage-agent/opensage-adk --skill joern-slice -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install opensage-agent/opensage-adk joern-slice --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/src/opensage/bash_tools/static_analysis/joern-slice .opencode/skills/joern-slice && 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 "joern-slice" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/static_analysis/joern-slice into .opencode/skills/joern-slice/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "joern-slice", 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
joern-slice- GitHub stars
- 127
- Token cost
- ~189 tokens
- SKILL.md length
- 63 words
- Files
- 2 (incl. scripts)
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Tool to get the program slice for a given function using Joern.
- Tasks that involve Static analysis and SAST
- SKILL.md covers Usage, Parameters, Return Value and Requires Sandbox
- Runs Shell scripts from its folder
What it does
Joern Slice is an agent skill from opensage-agent/opensage-adk. Tool to get the program slice for a given function using Joern.
Its SKILL.md is about 190 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts (for example `scripts/joern_slice.sh`).
It sits in Security, covering Static analysis and SAST. The licence is Apache-2.0.
When your agent uses it
- Tasks that involve Static analysis and SAST
Example prompts
- “/joern-slice”
Requirements
- A Bash shell
What it can do on your machine
Read from SKILL.md and the folder at commit 54d6470. 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
Ships 1 file in scripts/ (Shell), which the agent can run.
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
Joern Slice loads about 189 tokens when it runs. Until then it costs about 19 tokens; SKILL.md has 63 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); the scripts in this folder are not scanned.
SKILL.md
The full file from opensage-agent/opensage-adk at commit 54d6470, republished under its Apache-2.0 licence (© opensage-agent). 63 words, ~189 tokens.
Download SKILL.mdSave it as
.claude/skills/joern-slice/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- joern-slice
- description
- Tool to get the program slice for a given function using Joern.
- should_run_in_sandbox
- joern
- returns_json
- false
Joern Slice Tool
Tool to get the program slice for a given function using Joern.
Usage
/bash_tools/static_analysis/joern-slice/scripts/joern_slice.sh "function_name" --file-path "relative/path/to/file.py"Parameters
function_name (required, positional position 0)
Type: str
Function name to slice.
--file-path (optional, named parameter)
Type: str
Optional file path where the function is defined.
Return Value
Returns plain text output listing slice information for each file, including file paths and line numbers.
Requires Sandbox
joern
© opensage-agent, Apache-2.0. 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 1 other file (scripts) in src/opensage/bash_tools/static_analysis/joern-slice of opensage-agent/opensage-adk.
- SKILL.md
- scripts/joern_slice.sh
Open the folder on GitHubat commit 54d6470
Compare with similar skills
Joern Slice 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 |
|---|---|---|---|---|---|---|
| Joern Slice this skillopensage-agent/opensage-adk | 127 | — | ~189 | Automated safety check: Pass | Apache-2.0 | |
| Semgrepvigolium/piolium | 140 | 1 repos | ~2.4k | Automated safety check: Notes | MIT | |
| C To AstNarwhal-Lab/MagicSkills | 316 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Semgrep Security Scantrailofbits/skills | 7.4k | — | ~3.7k | Automated safety check: Notes | CC-BY-SA-4.0 | |
| LLM Sast ScannerSunWeb3Sec/llm-sast-scanner | 286 | — | ~6.2k | Automated safety check: Pass | None | |
| Sast SemgrepAgentSecOps/SecOpsAgentKit | 220 | 2 repos | ~2.4k | Automated safety check: Pass | Custom licence |
Similar skills
C To Ast
Narwhal-Lab/MagicSkills
Parse C source code into an Abstract Syntax Tree (AST). An agent skill from Narwhal-Lab/MagicSkills.
- Official
Semgrep Security Scan
trailofbits/skills
Detects languages, proposes rulesets for approval, then runs the approved Semgrep scan across a codebase and merges the output into one SARIF file.
LLM Sast Scanner
SunWeb3Sec/llm-sast-scanner
General-purpose Static Application Security Testing (SAST) skill for code vulnerability analysis.
Sast Semgrep
AgentSecOps/SecOpsAgentKit
Static application security testing (SAST) using Semgrep for vulnerability detection, security code review, and secure coding guidance with OWASP and CWE framework mapping.
Triage Codeql
netdata/netdata
Inspect, review or triage GitHub Code Scanning alerts, including CodeQL findings; apply verified dismissals when authorized.
More from opensage-agent/opensage-adk
All 21 skills in this repoRun Fuzzing Campaign
opensage-agent/opensage-adk
Run a fuzzing campaign using AFL++ with optional seeds; supports --custommutatorpath (you can write your own custom mutator and use this to execute).
Pool
opensage-agent/opensage-adk
Run N tasks under a concurrency cap K via a sliding-window worker pool.
Create New Tool
opensage-agent/opensage-adk
Scaffold a new bashtools Skill under bashtools/newtools/. An agent skill from opensage-agent/opensage-adk.
Extract Crashes
opensage-agent/opensage-adk
Extract crash inputs from fuzzing output into a target directory.
Get Call Paths
opensage-agent/opensage-adk
Get a path in the call graph from a source function to a specified destination function in the codebase.
Get Callee
opensage-agent/opensage-adk
Tool to get the callee of a function in the codebase by function name and file path.
Related
Categories
Questions about Joern Slice
What does Joern Slice do?
Tool to get the program slice for a given function using Joern. Joern Slice is an agent skill from opensage-agent/opensage-adk. Tool to get the program slice for a given function using Joern.
When should I use Joern Slice?
Joern Slice fits situations like: tasks that involve Static analysis and SAST.
How do I install Joern Slice in Claude Code?
Run `npx skills add opensage-agent/opensage-adk --skill joern-slice -a claude-code`. Or copy the skill folder (src/opensage/bash_tools/static_analysis/joern-slice in opensage-agent/opensage-adk) into .claude/skills/joern-slice in your project. Claude Code loads it when a task matches its description.
How do I install Joern Slice in Codex?
Run `npx skills add opensage-agent/opensage-adk --skill joern-slice -a codex`. Or copy the skill folder (src/opensage/bash_tools/static_analysis/joern-slice in opensage-agent/opensage-adk) into .agents/skills/joern-slice in your project. Codex loads it when a task matches its description.
Can I use Joern Slice 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 opensage-agent/opensage-adk --skill joern-slice -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/joern-slice, .gemini/skills/joern-slice, .github/skills/joern-slice and .opencode/skills/joern-slice in your project.
What does Joern Slice need to run?
Going by SKILL.md and its folder, Joern Slice needs a shell for the scripts in its folder. Our summary lists: A Bash shell.
Does Joern Slice 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 Joern Slice 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Joern Slice use?
Joern Slice is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Joern Slice use?
About 189 tokens (SKILL.md is roughly 756 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 Joern Slice?
Skills that share tags, products or a category with Joern Slice: Semgrep (vigolium/piolium, 140 stars), C To Ast (Narwhal-Lab/MagicSkills, 316 stars), Semgrep Security Scan (trailofbits/skills, 7.4k stars) and LLM Sast Scanner (SunWeb3Sec/llm-sast-scanner, 286 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Joern Slice?
opensage-agent (a GitHub organization) maintains it in opensage-agent/opensage-adk, which has 127 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on August 4, 2026.
Source: opensage-agent/opensage-adk on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.