earl

by mathematic-inc · Developer Tools · ★ 113

earl is an MCP server by mathematic-inc. Secure CLI proxy for AI agents — HCL-defined operation templates with OS keychain secrets, MCP integration, and prompt injection protection. It has 113 GitHub stars and ranks #529 of 2217 in Developer Tools by stars.

Category: Developer Tools
Author: mathematic-inc
GitHub stars: 113
This week: Tracking since 18 Oct 2026
Language: Rust
License: Apache-2.0 (open source)
Last update: 2026-10-21 (3 days ago)
Links: Source Website

ai-agents
cli
graphql
grpc
hcl
http
mcp
prompt-injection
rust
security

How to install earl

Install steps differ per project, so follow the README in the earl repository. Most MCP servers start with a single command (npx -y <package>, uvx <package> or a Docker image) that you add to your client's config. The install guide shows where that goes in Claude Code, Claude Desktop, Cursor and VS Code.

Also listed in

MCP servers for security testing750

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Frequently asked questions

What is earl?

earl is an MCP server by mathematic-inc in the Developer Tools category. Secure CLI proxy for AI agents — HCL-defined operation templates with OS keychain secrets, MCP integration, and prompt injection protection. It has 113 GitHub stars and ranks #529 of 2217 in Developer Tools by stars. It is written in Rust. It is licensed under Apache-2.0. It was last updated 3 days ago.

Is earl free and open source?

Yes. earl is published under the Apache-2.0 license, so you can run, modify and self-host it at no cost. If it connects to a paid service, that service's own pricing and API terms still apply. Check the repository for the exact license text before using it commercially.

What are the alternatives to earl?

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Data last updated 25 October 2026. Stars and downloads are refreshed every day from GitHub and npm.