mcp2cli-rs

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Minimal, stateless CLI tool for MCP (Model Context Protocol) and OpenAPI.

A Rust implementation of mcp2cli.

Features

• Lightweight: Single binary < 3MB
• Stateless: No cache, no session, no persistence
• Machine-first: JSON output for program parsing
• Zero dependencies: Static linking, no runtime libraries

Installation

cargo build --release
# Binary: target/release/mcp2cli-rs

Usage

MCP HTTP Mode

# List tools
mcp2cli-rs mcp <URL> --list --json

# Call tool
mcp2cli-rs mcp <URL> <tool-name> --arg value --json

MCP stdio Mode

# List tools
mcp2cli-rs mcp-stdio "npx @modelcontextprotocol/server-filesystem /tmp" --list --json

# Call tool
mcp2cli-rs mcp-stdio "npx @modelcontextprotocol/server-filesystem /tmp" read_file --path /tmp/test.txt --json

OpenAPI Mode

# List operations
mcp2cli-rs spec <URL|FILE> --base-url <URL> --list --json

# Call operation
mcp2cli-rs spec <URL|FILE> --base-url <URL> <operation-id> --param value --json

Environment Variables

• MCP_API_KEY: API key for authentication
• MCP_BEARER_TOKEN: Bearer token for authentication

Exit Codes

Code	Meaning
0	Success
1	CLI Error
2	Network Error
3	Protocol Error
4	Execution Error

License

MIT