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wallet-shim

v0.1.2

Published

Fake EIP-1193 (MetaMask-compatible) provider for dApp browser automation. Injects a connected wallet, dry-runs transactions.

Vulnerabilities

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  • 0Medium
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Links

Git

Maintainers

syou_nftsyou_nft

Keywords

ethereumeip-1193eip-6963metamaskwalletmockdappe2ebrowser-automationagent-skill

Readme

wallet-shim

npm version CI License: MIT node Agent skill

Fake EIP-1193 / EIP-6963 provider (MetaMask-compatible) for dApp browser automation. Injects a "connected" wallet, signs with a throwaway key or fakes signatures for an arbitrary address, and dry-runs transactions (records them, returns a hash and a synthesized receipt, never broadcasts).

Install as an agent skill

npx skills add nft-syou/wallet-shim          # picks the agents you have installed
npx skills add nft-syou/wallet-shim -a claude-code -y

The skill's instructions call the CLI through npm, so nothing else needs installing:

npx wallet-shim@latest --generate-key --chain sepolia --out shim.out.js
npx wallet-shim@latest --address 0xYourAddress --chain mainnet --out shim.out.js

The skill lives in skills/wallet-shim/ (SKILL.md + injection recipes only, 7 files); the CLI and bundle come from the npm package. Without npm access, clone this repo and run node bin/wallet-shim.mjs directly.

Develop

npm install
npm run build                      # dist/shim.js
node bin/wallet-shim.mjs --generate-key --chain sepolia --out shim.out.js
npx agent-browser open --init-script shim.out.js https://app.example.com

Try it against the bundled fixture dApp end-to-end:

npm run fixture                    # separate terminal: builds and serves test/fixture on :3000
node bin/wallet-shim.mjs --generate-key --chain sepolia --out .wallet-shim/shim.out.js
npm run e2e                        # drives the fixture with puppeteer-core, asserts connect/sign/send/receipt
  • Skill instructions: skills/wallet-shim/SKILL.md
  • Agent skill (instructions + injection recipes): skills/wallet-shim/
  • Design: docs/superpowers/specs/2026-09-18-wallet-shim-design.md

Verified

  • Unit tests: npm test (vitest) covers the router, signing, chains, CLI and dist bundle.
  • E2E: npm run e2e drives the bundled fixture dApp with puppeteer-core against the Chrome that agent-browser install downloads, exercising both load-before (evaluateOnNewDocument) and load-after (page.evaluate) injection.
  • Orca built-in browser: load-after injection via orca eval + <script src> verified manually against the fixture (see skills/wallet-shim/recipes/orca-cli.md).

Never use real private keys with this tool. See SECURITY.md for the threat model.

Contributing

Bug reports and pull requests are welcome; see CONTRIBUTING.md. Release notes live in CHANGELOG.md.

License

MIT © 2026 nft-syou