flowR — Claude Code MCP server: R analysis and program slicing
MCP server for static R code analysis: program slicing, linting, dependency extraction, and signature database search. No R installation required.
claude mcp add flowr -- npx -y @eagleoutice/flowr-mcpWhat flowR does
The server exposes a single query tool that calls flowR's Query API: slices programs by criterion, runs the linter, guesses R versions, and searches function signatures in the database. On first start it downloads the flowR signature database (66 MB) into ~/.cache/flowr and verifies its hash; version guessing and signature search require this database, other queries work offline. The code is never executed.
In Claude Code, install with /plugin install flowr --marketplace flowr-analysis/flowr. Other clients use npx -y --omit=optional --ignore-scripts @eagleoutice/flowr-mcp over stdio or JSON config. The flags --omit=optional --ignore-scripts keep the install small by skipping optional dependencies and install scripts.
Remote clients (ChatGPT, claude.ai) connect the server over HTTPS through a tunnel; it listens on 127.0.0.1 at the port from $PORT or 1042. Over HTTP, secure mode applies: the server never reads files (files argument and source() are ignored, config query refused), disables network access, stops each analysis after 30 seconds or 2 GB of memory, and cuts answers at 50000 characters. One analysis at a time, up to 16 waiting.
What it helps with
- slice an R program by variable or expression
- extract dependencies and imports from R code
- lint an R script without running it
- search for a function signature in the flowR database
- guess the R version from code syntax
Example prompts for the agent
- Analyze
analysis.Rwith flowR and show dependencies - Slice this R script by variable
resultand keep only the necessary lines - Lint the R code in
data_pipeline.R
How to install flowR
Platform CLI
claude mcp add flowr -- npx -y @eagleoutice/flowr-mcpPlatform CLI
codex mcp add mcp -- npx -y @eagleoutice/flowr-mcpConfig file
{
"mcpServers": {
"mcp": {
"command": "npx",
"args": [
"-y",
"@eagleoutice/flowr-mcp"
]
}
}
}Config file
{
"servers": {
"mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@eagleoutice/flowr-mcp"
]
}
}
}Platform CLI
gemini mcp add mcp npx -y @eagleoutice/flowr-mcpStep by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about flowR
How to install flowR in Claude Code?
In Claude Code, run /plugin install flowr --marketplace flowr-analysis/flowr. For other clients, add the MCP server with claude mcp add flowr -- npx -y @eagleoutice/flowr-mcp or through JSON config with npx -y @eagleoutice/flowr-mcp.
What does the flowR MCP server do?
The server analyzes R code statically: performs program slicing, linting, extracts dependencies, guesses R versions, and searches function signatures. The code is never run, and R installation is not needed.
Does flowR MCP server require R installation?
No. The server works without R and analyzes code statically without executing it. On first start it only downloads the flowR signature database.
