Four ways in.
One engine underneath.

No repo changes — updates arrive with the plugin instead of living in your tree.

/plugin marketplace add jquatier/squinch
/plugin install squinch@squinch

The same directory, packaged as an Agent Plugin — Codex reads it, and so do Cursor, Copilot, Kiro and VS Code.

codex plugin marketplace add jquatier/squinch
codex plugin add squinch@squinch

One package, and the first render is two commands. macOS, Linux and Windows, on Node ≥ 22.

npm i -g squinch          # or npx squinch <cmd>

squinch init my-diagrams
squinch render my-diagrams --sync

npx squinch skill in your project writes .agents/skills/ (plus .claude/skills/ when it detects Claude Code); --global does the same under your home directory, --print emits SKILL.md for any other harness. Then ask your agent for a diagram in plain language.

npx squinch skill

Download squinch-vscode-<version>.vsix from GitHub Releases and install it. The same file installs in Cursor, Windsurf and VSCodium.

code --install-extension squinch-vscode-<version>.vsix

squinch-check fails the build when a committed SVG is stale; squinch-diff comments what changed, architecturally, on the PR. Pin the version input: rendering is deterministic per tool version.

uses: jquatier/squinch/.github/actions/squinch-check@main

A path can be a single file or a directory — a directory is one project, and its files share a namespace.