Strix is an open-source penetration-testing tool that uses autonomous AI agents to inspect applications, exploit vulnerabilities, and validate findings with working proofs of concept. Developers and security teams use it for application security testing, bug-bounty research, remediation guidance, reporting, and automated checks in development pipelines.
Borrowing it
Nothing to install: this file belongs to usestrix/strix. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/usestrix/strix/main/AGENTS.mdgit clone --depth 1 https://github.com/usestrix/strixWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/usestrix/strix/agents-md)<a href="https://agentmods.dev/instructions/usestrix/strix/agents-md"><img src="https://agentmods.dev/badge/instructions/usestrix/strix/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/usestrix/strix/agents-md"><img src="https://agentmods.dev/badge/instructions/usestrix/strix/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.01861 | $0.01861 |
| Opus 5.5 | $0.00744 | $0.00744 |
| Sonnet 5.5 | $0.00372 | $0.00372 |
| Haiku 4.5 | $0.00186 | $0.00186 |
Grade C, and why
strix AGENTS.md scanned grade C with 2 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 today.
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.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -sSL https://strix.ai/install | bash # install Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sSL https://strix.ai/install | bash # install How it starts
The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Strix — Agent Guide
Strix is an open-source autonomous AI pentesting tool. This file is for AI coding agents that want to use Strix (run security scans) or contribute to it.
Using Strix from an agent
Install the agent skills for step-by-step workflows:
npx skills add usestrix/strix
penetration-testing-with-strix— run a headless pentest against code, URLs, domains, or IPs and read results (covers both run modes below)managed-pentesting-with-strix— drive the managed app.strix.ai platform via REST (no local Docker/LLM needed)fix-security-vulnerabilities-with-strix— remediate findings and re-run Strix to verifyci-security-scanning-with-strix— add PR scanning to CI/CD (self-hosted CLI or managed app)
Target-specific workflows built on the same engine:
application-security-testing— whole-product AppSec review: pick the right test per asset, then rank the resultsweb-app-penetration-testing— black-box pentest of a live web app or staging siteapi-security-testing— REST/GraphQL APIs and the OWASP API Security Top 10 (BOLA/IDOR, authz)owasp-top-10-testing— systematic OWASP Top 10 assessment with honest per-category coveragefind-security-vulnerabilities-in-code— white-box review of a repo or working tree
Two ways to run, same engine — pick per situation:
- Open-source CLI (self-hosted): free, fully local, BYO LLM key, needs Docker. Best for local dev loops, air-gapped/offline, and full control.
curl -sSL https://strix.ai/install | bash # install export STRIX_LLM="openrouter/z-ai/glm-5.3" # any LiteLLM model id, or vercel_ai_gateway/zai/glm-5.3 export LLM_API_KEY="<key>" strix -n -t ./ --scan-mode quick --max-budget 10 # headless scan; always use -n- Requires Docker running. Scans take minutes (
quick) to hours (deep) — run in the background. - Exit codes (headless):
0clean,1fatal error,2vulnerabilities found. A0only covers what was analyzed — checkrun.json(status,llm_usage.costvs the budget) before calling a run clean. - Artifacts in
strix_runs/<run-name>/:penetration_test_report.md,vulnerabilities/*.md,vulnerabilities.json,findings.sarif(SARIF 2.1.0),run.json.
- Requires Docker running. Scans take minutes (
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.
- today Changed · +14 tokens per session 1dea44e812d0
- 1mo ago Changed · +2 tokens per session 221532187067
- 1mo ago Changed · +12 lines · +835 tokens per session f5fee1e91a15
- 1mo ago First seen · 58 lines · 1,010 tokens per session scan C ea19fffafb90
strix AGENTS.md is an instructions file published in the GitHub repository usestrix/strix (72,157 stars, last pushed today), licensed Apache-2.0. It adds 1,861 tokens to every session, about $0.0074 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.