defender

by StackOneHQ · MCP Server · ★ 126

About 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.

ai-securityindirect-prompt-injectionllm-securitymcp-securityprompt-injectionprompt-injection-defenseprompt-injection-detectionprompt-injection-protection

Quick Facts

Stars126
Forks13
LanguageTypeScript
CategoryMCP Server
LicenseApache-2.0
Quality Score39.75/100
Open Issues2
Last Updated2026-10-11
Created2026-02-13
Platformscli, mcp, node
Est. Tokens~4943k

Compatible Skills

These tools work well together with defender for enhanced workflows:

  • AgentWard — semantic(0.37)+complementary+rare_topics+same_lang+similar_pop+shared_platform (62%)
  • arcjet-js — semantic(0.46)+rare_topics+same_lang+similar_pop+shared_platform (56%)
  • parry-guard — semantic(0.69)+complementary+similar_pop (54%)
  • claude-skills-supercharged — semantic(0.23)+complementary+same_lang+similar_pop+shared_platform (53%)
  • agent-threat-rules — semantic(0.46)+rare_topics+same_lang+similar_pop+shared_platform (51%)

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Frequently Asked Questions

What is defender?

defender is 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.. It is categorized as a MCP Server with 126 GitHub stars.

What programming language is defender written in?

defender is primarily written in TypeScript. It covers topics such as ai-security, indirect-prompt-injection, llm-security.

How do I install or use defender?

You can find installation instructions and usage details in the defender GitHub repository at github.com/StackOneHQ/defender. The project has 126 stars and 13 forks, indicating an active community.

What license does defender use?

defender is released under the Apache-2.0 license, making it free to use and modify according to the license terms.

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