Prompt Shield MCP Server
by mthamil107Prompt-injection firewall for LLM applications — 33 input detectors, 9 output scanners, federated ed25519-signed threat-intel feed. Apache 2.0, 1040 tests, F1 96.0% with 0% false positives. Docker, GitHub Action, LangChain/LlamaIndex/CrewAI integrations.
Prompt Shield is an open-source mcp server by mthamil107, written mainly in Python, with 18 GitHub stars and the Apache-2.0 license. Its code was last updated Oct 28, 2026. The latest PyPI release is prompt-shield-ai 0.9.0, published Nov 12, 2026, with 214 downloads last week.
Scan summary: scanned Nov 5, 2026 at commit 4ba3a54. Seen able to run shell commands, connect to the internet. Scan policy
What Prompt Shield can touch
- Seen in this scan, either in the code or while it ran.Run shell commandsFound in the code by our scan
- Our checks did not find this. The tool may still do it.Run dynamic codeNot seen in this scan
- Our checks did not find this. The tool may still do it.Read or write filesNot seen in this scan
- Our checks did not find this. The tool may still do it.Read environment and secretsNot seen in this scan
- Our checks did not find this. The tool may still do it.Control a web browserNot seen in this scan
- Our checks did not find this. The tool may still do it.Connect to databasesNot seen in this scan
- Our checks did not find this. The tool may still do it.Read or send messagesNot seen in this scan
- Our checks did not find this. The tool may still do it.Touch money or tradingNot seen in this scan
- Seen in this scan, either in the code or while it ran.Connect to the internetFound in the code by our scan
"Not seen" means our checks did not find it, and the tool may still do it. Covers commit 4ba3a54, Nov 5, 2026. See the scan policy.
Before you install Prompt Shield
AgenticMart scanned Prompt Shield on Nov 5, 2026 with automated checks for hidden code, known-malicious packages, leaked secrets and vulnerable dependencies. The result covers one commit under our scan policy, so review what access you give it and check any advisories shown here.
What it can access
- An MCP server is a program your AI app starts and talks to. A local one runs with your user's permissions: it can see the files, environment variables and network your account can.
- Based on its description and topics, it likely needs to use a code-hosting token (GitHub/GitLab).
- Based on its description and topics, it likely needs to act on cloud infrastructure.
Before you install
- Use a fine-grained token limited to the repos it needs.
- Use a role with only the permissions it needs, never an admin key.
- Pin the version you reviewed instead of always installing the latest release.
- Read the tool list or scripts before the first run, and keep approval prompts on for actions that write, send or delete.
- Maintained by mthamil107 on GitHub, 18 stars and 9 forks. Popularity is not proof of safety.
- Last code change: Oct 28, 2026.
- Open-source license: Apache-2.0.
Prompt Shield is an open-source mcp server by mthamil107, written mainly in Python. Prompt-injection firewall for LLM applications — 33 input detectors, 9 output scanners, federated ed25519-signed threat-intel feed. Apache 2.0, 1040 tests, F1 96.0% with 0% false positives. Docker, GitHub Action, LangChain/LlamaIndex/CrewAI integrations.
At a glance
- Stars
- 18
- Forks
- 9
- Language
- Python
- License
- Apache-2.0
- Created
- Feb 2026
- Last update
- Oct 28, 2026
- Type
- MCP Server
- Price
- Free
Topics
Questions about Prompt Shield
What is Prompt Shield?
Prompt-injection firewall for LLM applications — 33 input detectors, 9 output scanners, federated ed25519-signed threat-intel feed. Apache 2.0, 1040 tests, F1 96.0% with 0% false positives. Docker, GitHub Action, LangChain/LlamaIndex/CrewAI integrations.
Who maintains Prompt Shield?
Prompt Shield is maintained by mthamil107 on GitHub (mthamil107/prompt-shield). AgenticMart lists it from public repository data.
Is Prompt Shield safe to use?
AgenticMart scanned Prompt Shield on Nov 5, 2026 with automated checks for hidden code, known-malicious packages, leaked secrets and vulnerable dependencies. The result covers one commit under our scan policy, so review what access you give it and check any advisories shown here.
What license does Prompt Shield use?
It is published under the Apache-2.0 license.
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