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feat(readme): ✨ Add README for Command Blocker Plugin
Introduced a comprehensive README for the Command Blocker Plugin, detailing its features, command blocking rules, installation instructions, configuration, usage examples, and rationale behind its design. This documentation aims to enhance user understanding and facilitate proper usage of the plugin. - Documented command blocking for JavaScript, Python, Git, and Nix commands. - Included guidelines for file edit blocking and advanced features. - Provided installation and configuration instructions. Closes #<issue-number>
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‎README.md‎

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# Command Blocker Plugin
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A comprehensive opencode plugin that enforces best practices by blocking potentially harmful or non-reproducible commands and file edits.
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## Features
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### Command Blocking
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The plugin blocks various commands to promote better development practices:
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#### JavaScript/Node.js Commands
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- **`node`** - Blocked in favor of `bun` or `bunx`
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- **`npm`** - Blocked in favor of `bun` or `bunx`
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#### Python Commands
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- **`pip`** - Blocked in favor of `uv` or `uvx`
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- **`python`**, **`python2`**, **`python3`** - Blocked in favor of `uv` or `uvx`
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#### Git Commands
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- **Write operations** - Only read-only git commands are allowed:
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- ✅ `git status`
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- ✅ `git diff`
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- ✅ `git show`
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- ❌ `git add`, `git commit`, `git push`, `git checkout`, etc.
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#### Nix Commands
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- **Local flake references** - Must use proper prefixes:
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- ✅ `nix run path:./my-flake#output`
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- ✅ `nix run github:user/repo#output`
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- ✅ `nix run git+https://github.com/user/repo#output`
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- ❌ `nix run ./my-flake#output`
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### File Edit Blocking
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#### Lock Files
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Prevents editing of auto-generated lock files:
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- `package-lock.json` - Use `bun install` or `bun update` instead
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- `bun.lockb` - Use `bun install` or `bun update` instead
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- `yarn.lock` - Use `yarn install` or `yarn upgrade` instead
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- `pnpm-lock.yaml` - Use `pnpm install` or `pnpm update` instead
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- `poetry.lock` - Use `poetry install` or `poetry update` instead
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- `uv.lock` - Use `uv sync` or `uv lock` instead
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- `Cargo.lock` - Use `cargo update` instead
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- `Gemfile.lock` - Use `bundle install` or `bundle update` instead
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- `flake.lock` - Use `nix flake update` instead
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## Installation
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```bash
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# Add to your opencode plugins
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```
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## Configuration
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The plugin works out of the box with sensible defaults. All blocking rules are hardcoded for consistency and reliability.
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## Usage Examples
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### Allowed Commands
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```bash
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# JavaScript with Bun
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bun install
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bunx create-react-app my-app
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# Python with uv
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uv sync
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uvx ruff check .
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# Git read operations
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git status
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git diff HEAD~1
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git show HEAD
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# Nix with proper prefixes
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nix run path:./my-flake#hello
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nix run github:nix-community/nixpkgs-fmt#nixpkgs-fmt
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```
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### Blocked Commands
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```bash
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# These will be blocked with helpful error messages
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node --version
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npm install
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pip install requests
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python script.py
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git add .
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nix run ./my-flake#hello
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```
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## Advanced Features
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### Escape Method Detection
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The plugin detects and blocks various command injection techniques:
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- **Piping**: `echo "node --version" | bash`
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- **Command substitution**: `echo $(node --version)`
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- **Backticks**: `echo \`node --version\``
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- **Semicolons**: `ls; node --version`
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- **Logical operators**: `ls && node --version`
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- **Background execution**: `node --version &`
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- **Redirection**: `node --version > output.txt`
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- **Environment variables**: `NODE_ENV=prod node app.js`
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- **Eval/Exec**: `eval "node --version"`
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- **Quoted strings**: `bash -c "node --version"`
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### Complex Pattern Matching
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The plugin uses sophisticated regex patterns to detect blocked commands in:
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- Complex command structures
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- Multi-line commands
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- Nested command substitutions
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- Various quoting styles
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## Testing
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Run the test suite:
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```bash
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npm test
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# or
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bun test
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```
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The plugin includes comprehensive tests covering:
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- All blocked commands and allowed alternatives
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- File edit restrictions
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- Various escape methods and edge cases
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- Integration scenarios
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## Rationale
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This plugin enforces several development best practices:
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1. **Reproducibility**: Blocks direct package manager usage in favor of modern alternatives
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2. **Lock File Integrity**: Prevents manual editing of auto-generated lock files
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3. **Git Workflow**: Encourages proper git workflows by limiting write operations
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4. **Nix Best Practices**: Ensures proper flake referencing for reproducibility
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5. **Security**: Blocks potentially harmful command injection techniques
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## Contributing
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When adding new blocking rules:
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1. Add the rule to the appropriate constant (e.g., `BLOCKED_COMMAND_MESSAGES`)
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2. Implement the validation logic in the corresponding function
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3. Add comprehensive tests covering various usage patterns
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4. Update this README with the new functionality
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## License
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This plugin is part of the opencode ecosystem.

‎command-blocker.test.ts‎

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@@ -516,6 +516,24 @@ describe("Command Blocker", () => {
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await expect(
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plugin["tool.execute.before"](input3, output3)
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).rejects.toThrow();
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const input4 = { tool: "bash" };
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const output4 = { args: { command: "git checkout file.txt" } };
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await expect(
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plugin["tool.execute.before"](input4, output4)
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).rejects.toThrow();
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const input5 = { tool: "bash" };
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const output5 = { args: { command: "git checkout HEAD -- file.txt" } };
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await expect(
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plugin["tool.execute.before"](input5, output5)
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).rejects.toThrow();
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const input6 = { tool: "bash" };
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const output6 = { args: { command: "git checkout main" } };
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await expect(
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plugin["tool.execute.before"](input6, output6)
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).rejects.toThrow();
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});
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it("should allow non-git commands", async () => {
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});
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});
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describe("checkNixFileContent", () => {
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let plugin: any;
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let mockApp: any;
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let mockClient: any;
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let mock$: any;
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beforeEach(async () => {
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mockApp = {};
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mockClient = {};
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mock$ = {};
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plugin = await CommandBlocker({
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app: mockApp,
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client: mockClient,
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$: mock$,
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});
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});
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it("should block npm install in nix files", async () => {
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const input1 = { tool: "edit" };
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const output1 = {
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args: { filePath: "flake.nix", newString: "npm install package" },
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};
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await expect(
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plugin["tool.execute.before"](input1, output1)
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).rejects.toThrow(
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"`npm install` has no internet access during build in Nix sandbox"
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);
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const input2 = { tool: "edit" };
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const output2 = {
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args: {
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filePath: "default.nix",
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newString: "some content npm install",
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},
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};
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await expect(
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plugin["tool.execute.before"](input2, output2)
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).rejects.toThrow();
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});
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it("should allow other content in nix files", async () => {
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const input = { tool: "edit" };
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const output = {
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args: { filePath: "flake.nix", newString: "some nix content" },
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};
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await expect(
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plugin["tool.execute.before"](input, output)
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).resolves.toBeUndefined();
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});
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it("should allow npm install in non-nix files", async () => {
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const input = { tool: "edit" };
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const output = {
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args: { filePath: "package.json", newString: "npm install" },
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};
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await expect(
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plugin["tool.execute.before"](input, output)
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).resolves.toBeUndefined();
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});
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it("should handle empty inputs", async () => {
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const input1 = { tool: "edit" };
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const output1 = { args: { filePath: "", newString: "content" } };
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await expect(
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plugin["tool.execute.before"](input1, output1)
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).resolves.toBeUndefined();
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const input2 = { tool: "edit" };
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const output2 = { args: { filePath: "file.nix", newString: "" } };
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await expect(
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plugin["tool.execute.before"](input2, output2)
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).resolves.toBeUndefined();
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});
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});
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describe("checkTypeScriptAnyType", () => {
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let plugin: any;
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});
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});
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it("should block any type annotations", async () => {
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it("should allow any type annotations (temporarily disabled)", async () => {
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const input1 = { tool: "edit" };
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const output1 = {
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args: { filePath: "test.ts", newString: "const x: any = 5;" },
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};
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await expect(
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plugin["tool.execute.before"](input1, output1)
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).rejects.toThrow(
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"`any` type annotations are blocked in TypeScript files. Use proper type annotations for better type safety."
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);
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).resolves.toBeUndefined();
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const input2 = { tool: "edit" };
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const output2 = {
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args: { filePath: "test.ts", newString: "function f(param: any) {}" },
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};
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await expect(
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plugin["tool.execute.before"](input2, output2)
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).rejects.toThrow();
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).resolves.toBeUndefined();
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const input3 = { tool: "edit" };
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const output3 = {
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args: { filePath: "test.ts", newString: "const arr: any[] = [];" },
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};
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await expect(
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plugin["tool.execute.before"](input3, output3)
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).rejects.toThrow();
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).resolves.toBeUndefined();
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const input4 = { tool: "edit" };
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const output4 = {
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};
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await expect(
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plugin["tool.execute.before"](input4, output4)
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).rejects.toThrow();
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).resolves.toBeUndefined();
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const input5 = { tool: "edit" };
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const output5 = {
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args: { filePath: "test.ts", newString: "const x = value as any;" },
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};
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await expect(
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plugin["tool.execute.before"](input5, output5)
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).rejects.toThrow();
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).resolves.toBeUndefined();
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});
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it("should allow proper type annotations", async () => {
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);
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});
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it("should check file content for nix files", async () => {
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const plugin = await CommandBlocker({
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app: mockApp,
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client: mockClient,
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$: mock$,
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});
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const input = { tool: "edit" };
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const output = {
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args: { filePath: "flake.nix", newString: "npm install package" },
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};
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const hook = (plugin as PluginHook)["tool.execute.before"];
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await expect(hook(input, output)).rejects.toThrow(
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"`npm install` has no internet access during build in Nix sandbox"
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);
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});
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it("should check file content for TypeScript any types", async () => {
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it("should allow file content with TypeScript any types (temporarily disabled)", async () => {
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const plugin = await CommandBlocker({
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app: mockApp,
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client: mockClient,
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await expect(
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plugin["tool.execute.before"](input, output)
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).rejects.toThrow(
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"`any` type annotations are blocked in TypeScript files"
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);
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).resolves.toBeUndefined();
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});
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13121238
it("should check bash commands", async () => {

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