Point Blue Technology Homebrew tap

brew install pointbluetechnology/tap/fdiag

fdiag

fdiag reads, writes, validates, converts and renders flow diagrams and sequence diagrams: FlowDiagram's .flow text format, Sequence Diagram for Mac's .msd, and Mermaid sequence diagrams. It renders SVG, PNG, PDF and OmniGraffle documents, and fdiag mcp runs an MCP server so AI agents can work with diagrams.

fdiag outline checkout.flow        # numbered, plain-language reading of every diagram
fdiag validate checkout.flow       # errors with line numbers
fdiag render checkout.flow -o checkout.svg
fdiag convert legacy.msd -o legacy.flow
fdiag reference                    # .flow syntax guide

To give Claude Code the MCP tools:

claude mcp add --scope user flowdiagram -- fdiag mcp

Requires macOS 26 or later. Binaries are signed with a Developer ID and notarized by Apple; they're attached to this repository's releases.