Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/securitytalent/bugskill-ai/jsanpx skills add SecurityTalent/bugskill-ai --skill jsagit clone --depth 1 https://github.com/SecurityTalent/bugskill-aiWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.00412 |
| Opus 5 | $0.00000 | $0.00206 |
| Sonnet 5 | $0.00000 | $0.00082 |
| Haiku 4.5 | $0.00000 | $0.00041 |
Grade A, and why
jsa scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
JSA - JavaScript Security Analyzer
Comprehensive JavaScript security analysis tool that uses Chrome DevTools MCP to analyze web applications.
Purpose
Automatically analyze a website's JavaScript for security vulnerabilities, API endpoints, authentication methods, and potential XSS sinks. Creates a detailed security report with file and line number citations.
Usage
/jsa <domain>
Example:
/jsa example.com
/jsa https://app.example.com
What it does
- Navigates to domain using Chrome DevTools MCP
- Captures all JavaScript files loaded by the page
- Downloads JavaScript files for analysis
- Runs jsluice on all files to extract endpoints, secrets, and patterns
- Analyzes code for:
- XSS sinks (innerHTML, eval, document.write, etc.)
- API endpoints and routes
- Authentication methods
- Obfuscation techniques
- Frameworks and libraries
- Generates comprehensive Markdown report with:
- File:line citations for all dangerous functions
- Complete endpoint list with cURL commands
- Security vulnerability analysis
- Remediation recommendations
Output
Creates a project folder structure:
/tmp/jsa-analysis/<domain>/
├── js/ # Downloaded JavaScript files
├── jsluice/ # jsluice output files
├── report.md # Main security analysis report
└── endpoints.txt # Extracted endpoints list
Requirements
- Chrome DevTools MCP (installed)
- jsluice (will check and install if needed)
- Headless Chrome running on port 9222
Parameters
<domain>- Target domain to analyze (required)- Can be domain only:
example.com - Or full URL:
https://example.com - Or subdomain:
app.example.com
- Can be domain only:
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 62 lines · 0 tokens per session scan A 75bf4cf61799
jsa is a skill published in the GitHub repository SecurityTalent/bugskill-ai (5 stars, last pushed 17d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 412 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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