The browser that rewrites any website. Keep what works, cut what doesn't, and add the features that should have been there in the first place.
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Shim is the browser that rewrites any website
Taken from the repository README
Loading the full README.
Read the full README ↗Change any website. Describe what you want ("hide the upsell banner", "add a notes field to every track", "put the columns I use first") and an agent writes a shim: a small, declarative patch that runs as a layer only you see. The site is never modified, and the original page is always one click away. When the site ships a new version, the shim re-finds what it changes on its own, with no AI involved, or holds the change for your review. It never silently attaches to the wrong element.
This repository holds Shim's open-source parts. The Shim browser is built on them.
Beta. Version 0.7.0 is the first public release. Nothing is on npm or the Chrome Web Store yet: everything installs from this repository's releases or from source. Expect rough edges, and please open an issue when you hit one.
| Package | What it is |
|---|---|
Shim for Chrome (@shimbrowser/extension) | Runs your shims in the Chrome you already use. Installs a .shim file, asks Chrome for access to exactly the sites it names, and keeps it applied as the site changes. Your coding agent can author on its tabs. |
MCP server, Claude Code plugin and shim CLI (@shimbrowser/mcp) | The authoring loop for any MCP agent (Claude Code, Codex, …): the agent opens a session on a tab (in the Shim browser, Shim for Chrome, or a headless Chromium), edits the shim, previews it on the live page, checks a screenshot and iterates, then saves it. The shim command line packs, lints and previews shims, and sets up the Chrome bridge. |
The engine (@shimbrowser/core) | What applies a shim to a page: anchors, the deterministic rebase, the spec format, and the contract every authoring host implements. No dependencies, no network, no AI. |
Each package's README has the full instructions, including what Shim for Chrome's permissions are for. In short, from the latest release:
Shim for Chrome. Download shim-for-chrome.zip and unzip it into a folder you
will keep. Open chrome://extensions, turn on Developer mode, click Load unpacked
and choose the folder. Then, on the extension's Details page, turn on Allow user
scripts so shims with script handlers run.
Full instructions.
The Claude Code plugin.
claude plugin marketplace add shimbrowser/shim
claude plugin install shim@shimbrowser
Without a GitHub SSH key, run export CLAUDE_CODE_PLUGIN_PREFER_HTTPS=1 first. To author
without the Shim browser or Shim for Chrome, also install Playwright's Chromium
(npm install -g playwright && playwright install chromium).
Full instructions.
The shim CLI and shim-mcp (also what connects your agent to Shim for Chrome):
npm install -g https://github.com/shimbrowser/shim/releases/latest/download/shimbrowser-mcp.tgz
shim --help
Codex and other MCP agents, after installing the CLI: codex mcp add shim -- shim-mcp,
or { "mcpServers": { "shim": { "command": "shim-mcp" } } } in your client's config. The
agent reads the authoring guide through the shim_guide tool.
Full instructions.
The engine, as a dependency of your own project:
npm install https://github.com/shimbrowser/shim/releases/latest/download/shimbrowser-core.tgz
Every release file's SHA-256 is in the release's SHA256SUMS.
Node 26 or later:
git clone https://github.com/shimbrowser/shim.git
cd shim
npm ci
npm run build # every package: packages/*/dist
npm test # every package's tests that need no browser
npm run test:browser also runs the tests that drive a real Chromium (Shim for Chrome
loaded unpacked, the headless host, the CLI and the plugin end to end); run
npx playwright install chromium once first. After a build:
packages/extension/dist: load that folder.claude --plugin-dir packages/mcp.node packages/mcp/dist/shim.js (or npm link -w @shimbrowser/mcp for shim).Issues and pull requests are welcome. Read CONTRIBUTING.md first.
Apache-2.0. © Artificial Apps, LLC.