Chiasmus Formal Verification
Chiasmus is an MCP server that gives language models access to formal verification
What is Chiasmus Formal Verification?
Chiasmus Formal Verification is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to chiasmus is an mcp server that gives language models access to formal verification
Chiasmus is an MCP server that gives language models access to formal verification
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- Chiasmus is an MCP server that gives language models access
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx chiasmusConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Chiasmus Formal Verification
Chiasmus is an MCP server that gives AI models direct access to formal verification tools including the Z3 SMT solver and Prolog-based logic programming. It exposes tools for checking satisfiability of constraints, tracing taint flows through call graphs, detecting dead code, and formalizing software specifications — capabilities that normally require specialized tooling. Teams building safety-critical software or verifying authorization policies can use it to catch logical contradictions and unreachable states before they become bugs.
Prerequisites
- Node.js 18 or later installed
- npm installed globally
- An MCP-compatible client such as Claude Desktop or Claude Code
- Optional: ANTHROPIC_API_KEY or OPENAI_API_KEY if using autonomous/semantic search mode
Install the chiasmus package globally
Install chiasmus from npm globally so it is available as a command on your PATH.
npm install -g chiasmusRegister the server with Claude Code
Use the claude mcp add command to register chiasmus as an MCP server.
claude mcp add chiasmus -- npx -y chiasmusConfigure optional environment variables
Set CHIASMUS_HOME for custom config storage and ANTHROPIC_API_KEY or OPENAI_API_KEY if you want to use the semantic search (chiasmus_search) tool which requires an LLM backend.
export CHIASMUS_HOME=~/.chiasmus
export ANTHROPIC_API_KEY=your_key_hereAdd to your MCP config file
Alternatively, add chiasmus to your claude_desktop_config.json for Claude Desktop. Provide env vars in the env block if needed.
{
"mcpServers": {
"chiasmus": {
"command": "npx",
"args": ["-y", "chiasmus"],
"env": {
"CHIASMUS_HOME": "/Users/you/.chiasmus",
"ANTHROPIC_API_KEY": "your_key_here"
}
}
}
}Restart your MCP client
Restart Claude Desktop or reload Claude Code to pick up the new server. Chiasmus caches per-file analysis results, so the first run on a large codebase may be slower than subsequent runs.
Chiasmus Formal Verification Examples
Client configuration
Add chiasmus to Claude Desktop with optional API key for autonomous mode.
{
"mcpServers": {
"chiasmus": {
"command": "npx",
"args": ["-y", "chiasmus"],
"env": {
"ANTHROPIC_API_KEY": "your_key_here"
}
}
}
}Prompts to try
Use Chiasmus to verify constraints, analyze call graphs, and detect logical issues in your code.
- "Use chiasmus_verify to check whether these authorization policy constraints can all be satisfied simultaneously"
- "Run chiasmus_graph on my TypeScript project to find dead code and unreachable functions"
- "Use chiasmus_formalize to help me write an SMT-LIB specification for this scheduling problem"
- "Check for cycles in the call graph of my Python service using chiasmus_graph"
- "Use chiasmus_map to give me an outline of all exports in this repository"Troubleshooting Chiasmus Formal Verification
chiasmus_search tool fails with an API error
The semantic search tool requires an LLM API key. Set ANTHROPIC_API_KEY or OPENAI_API_KEY in your environment or in the env block of your MCP config.
chiasmus_graph returns no results for a large repo
Chiasmus builds a persistent cache in CHIASMUS_CACHE_DIR (~/.cache/chiasmus by default). The first run on a large codebase can take several minutes. Subsequent runs use the 60x cache speedup.
npx -y chiasmus fails to start
Try installing globally first with npm install -g chiasmus, then reference the global binary directly in your config using 'command': 'chiasmus' instead of npx.
Frequently Asked Questions about Chiasmus Formal Verification
What is Chiasmus Formal Verification?
Chiasmus Formal Verification is a Model Context Protocol (MCP) server that chiasmus is an mcp server that gives language models access to formal verification It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Chiasmus Formal Verification?
Follow the installation instructions on the Chiasmus Formal Verification GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Chiasmus Formal Verification?
Chiasmus Formal Verification works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Chiasmus Formal Verification free to use?
Yes, Chiasmus Formal Verification is open source and available under the Apache-2.0 license. You can use it freely in both personal and commercial projects.
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