defender

Q: 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 97 GitHub stars.

Q: 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.

Q: 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 97 stars and 9 forks, indicating an active community.

Q: 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.

by StackOneHQ · MCP Server · ★ 97

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-security indirect-prompt-injection llm-security mcp-security prompt-injection prompt-injection-defense prompt-injection-detection prompt-injection-protection

Quick Facts

Stars	97
Forks	9
Language	TypeScript
Category	MCP Server
License	Apache-2.0
Quality Score	37.9/100
Open Issues	3
Last Updated	2026-05-14
Created	2026-02-13
Platforms	cli, mcp, node
Est. Tokens	~6867k

Compatible Skills

These tools work well together with defender for enhanced workflows:

clawmoat — semantic(0.61)+complementary+rare_topics+similar_pop+shared_platform (70%)
openclaw-skills-security — semantic(0.42)+complementary+rare_topics+similar_pop+shared_platform (68%)
openguardrails — semantic(0.45)+complementary+rare_topics+same_lang+similar_pop+shared_platform (65%)

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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 97 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 97 stars and 9 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.

View on GitHub → Browse MCP Server tools