# StackOneHQ/defender

<https://repo.masters-masters.com/en/repos/StackOneHQ/defender>

[Home](https://repo.masters-masters.com/en) › [StackOneHQ](https://repo.masters-masters.com/en/owners/StackOneHQ) › [defender](https://repo.masters-masters.com/en/repos/StackOneHQ/defender)

StackOneHQ/defender has 129 stars on GitHub. Its RepoMasters card: Prototype tier. Open source prompt injection protection for Agents calling tools (via MCP…

| Field | Value |
| --- | --- |
| Owner | [StackOneHQ](https://repo.masters-masters.com/en/owners/StackOneHQ) |
| Stars | 129 |
| Forks | 13 |
| Language | [TypeScript](https://repo.masters-masters.com/en/languages/typescript) |
| License | Apache-2.0 |
| Created | 2026 |
| Topics | ai-security, indirect-prompt-injection, llm-security, mcp-security, prompt-injection, prompt-injection-defense, prompt-injection-detection, prompt-injection-protection |
| Tier | [Prototype (100 to 249 ★)](https://repo.masters-masters.com/en/ranks/rush) |
| View on GitHub | [StackOneHQ/defender](https://github.com/StackOneHQ/defender) |

## Repository

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.

The tier for repos with 100 to 249 ★. Published odds per card pulled: 70%. Rarity: Common.

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Data: GitHub · Illustration drawn by RepoMasters from the repo’s ID and its language color.