Behavioral testing harness for MCP servers that validates agent behavior and interactions. An open-source CLI, library, and MCP server tool for developers building and testing MCP-compatible applications.
Litmus is a behavioral testing harness designed specifically for MCP (Model Context Protocol) servers. It provides a comprehensive framework for validating the behavior and interactions of AI agents and MCP-compatible tools. The package includes multiple interfaces—a CLI tool, a reusable library, and an MCP server implementation—allowing developers to test agent behavior programmatically and systematically.
As an open-source package from polygraphso, Litmus can be installed via npm or similar package managers. For CLI usage, install the package globally or locally in your project. For library integration, import it into your codebase. To use it as an MCP server, configure it within your MCP server setup following the standard MCP protocol specifications.
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