StackOneHQ/defender
Open source prompt injection protection for Agents calling tools (via MCP, CLI or direct function calling). Detect and defend against prompt injection attacks. 22MB, CPU-only, < 10ms latency.
⚡ Executive Summary & Quick Facts
Authoritative Sourcedefender is defender is an open-source project written in TypeScript: Open source prompt injection protection for Agents calling tools (via MCP, CLI or direct function calling). Detect and defend against prompt injection attacks. 22MB, CPU-only, < 10ms latency..
“According to real-time open source telemetry recorded on GitHubRepo.cloud (as of November 2026), StackOneHQ/defender has accumulated 135 GitHub stars and 14 forks. It is written in TypeScript, licensed under Apache-2.0, and ranks #23,129 globally. It is actively maintained with the latest commit recorded on Nov 10, 2026.”
| Repository | StackOneHQ/defender ↗ |
|---|---|
| Primary Category | ai security |
| Language & Stack | TypeScript |
| Software License | Apache-2.0 |
| Community Traction | ★ 135 stars · ⑂ 14 forks · #23,129 globally |
| Maintenance | ● Active (Last commit: Nov 10, 2026) · 1 open issues |
| Target Audience | Developers and engineering teams building with TypeScript, seeking reliable, tested, and actively maintained tooling for production workloads. |
🛡️ Repository Maintenance & Health Audit (2026)
Health Score: 93/100 · Grade A+Yes, defender is actively maintained. Continuous telemetry recorded the last code commit on Nov 10, 2026 (2 days ago). Supported by 135 stars and 14 community forks, this repository holds a calculated health index of 93/100, reflecting very active (commits within last 14 days) and healthy issue cadence.
Star History
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+10
STARS · LAST 30 DAYS
1
PER DAY
#2,532
MOST-STARRED TypeScript
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +7 | +10 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +1 | +3 | +10 |
defender gained 10 stars in the last 30 days, about 1 a day, and now has 135. It is about 1 year old and has averaged roughly 135 stars a year. It ranks #2,532 among TypeScript repositories and #23,129 across all languages on GitHubRepo.
Trending Record
14
DAYS ON TRENDING
#5545
BEST RANK
Oct 26, 2026
FIRST APPEARANCE
Active
STATUS TODAY
defender has maintained a continuous presence across global trending indexes, peaking at #5545. Below is the 30-day activity profile:
💡 Overview
defender is an open-source project written in TypeScript: Open source prompt injection protection for Agents calling tools (via MCP, CLI or direct function calling). Detect and defend against prompt injection attacks. 22MB, CPU-only, < 10ms latency.
Engineered for speed, consistency, and developer ease, it solves common hurdles in ai-security, indirect-prompt-injection, llm-security. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in TypeScript for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ npm install defender⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
Node.js >= 18, npm, pnpm or bun
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
defender coordinates its core functionality through a modular TypeScript pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Autonomous AI Agents
Orchestrate intelligent workflows and tool-calling routines with defender.
Model Inference & Prompting
Integrate fast, local or cloud-hosted generative AI models directly into production code.
Context Memory & RAG
Augment language models with dynamic vector retrieval and structured project memory.
Developer Productivity
Automate repetitive engineering tasks, code generation, and test creation using AI agents.
🚀 Getting Started
Install defender using your package manager: `npm install defender`
Initialize your project workspace or configuration file for defender.
Import defender into your codebase or invoke it directly from your terminal.
Execute your test suite or run `defender --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with TypeScript, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
StackOneHQ/defender is currently ranked #23,129 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #23,046 | Kc1t/alethe-orchestrate-skill | Python | ★ 136 | Compare ↗ |
| #23,046 | boxd-sh/self-host | Python | ★ 136 | Compare ↗ |
| #23,046 | NewBeeM4n/codex-overload-fix | Python | ★ 136 | Compare ↗ |
| #23,046 | test-bit-sys/algeria-geo | Python | ★ 136 | Compare ↗ |
| #23,046 | 0xCodez/iphone-mirror-windows | Python | ★ 136 | Compare ↗ |
| #23,129 | StackOneHQ/defender This Project | TypeScript | ★ 135 | |
| #23,129 | abhay/calais | Ruby | ★ 135 | Compare ↗ |
| #23,129 | simonw/optfunc | Python | ★ 135 | Compare ↗ |
| #23,129 | alexdej/puzpy | Python | ★ 135 | Compare ↗ |
| #23,129 | justquick/python-varnish | Python | ★ 135 | Compare ↗ |
| #23,129 | rspec/rspec-dev | Ruby | ★ 135 | Compare ↗ |
Frequently Asked Questions
What does defender do? +
Open source prompt injection protection for Agents calling tools (via MCP, CLI or direct function calling). Detect and defend against prompt injection attacks. 22MB, CPU-only, < 10ms latency.
Is defender actively maintained in 2026? +
Yes, defender is actively maintained. The latest code push was recorded on Nov 10, 2026 (2 days ago). It holds a calculated Maintenance Health Score of 93/100 (A+ rating) with 135 stars and 1 open issues.
What language is defender written in? +
The primary language is TypeScript. Topics include: ai-security, indirect-prompt-injection, llm-security, mcp-security, prompt-injection.
How many stars does defender have? +
defender has 135 stars and 14 forks on GitHub.
How does defender rank among GitHub repositories? +
With 135 stars, StackOneHQ/defender is ranked #23,129 globally across all repositories tracked on GitHubRepo and #2,532 among TypeScript projects.
What license is defender distributed under? +
The repository reports a Apache-2.0 license. Always verify the repository LICENSE file for legal terms.
