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eng/common/tsp-client/README.md

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+# TypeSpec Client Generator CLI
+
+This directory contains npm package definitions for `@azure-tools/typespec-client-generator-cli` (tsp-client) with pinned versions to ensure reproducible builds across environments and enhance security by preventing supply chain attacks.
+
+## Files
+
+- **`package.json`** - npm package definition with pinned tsp-client version
+- **`package-lock.json`** - Lock file ensuring exact dependency versions
+
+## Prerequisites
+
+- **Node.js** (with npm) - Required to install and run tsp-client
+
+## Installation
+
+### Install dependencies
+
+```bash
+# Navigate to this directory
+cd eng/common/tsp-client
+
+# Install dependencies (recommended for CI/security)
+npm i --ignore-scripts --no-audit
+```
+
+The `--ignore-scripts --no-audit` flags provide:
+
+- **Security**: Prevents potentially malicious install scripts from running
+- **Performance**: Skips vulnerability audit for faster installs
+- **Reliability**: Reduces potential points of failure during installation
+
+## Usage
+
+After installation, you can run tsp-client using one of these approaches:
+
+### Option 1: Change directory approach (recommended)
+
+```bash
+cd eng/common/tsp-client
+
+# Get help
+npm exec --no -- tsp-client --help
+
+# Check version
+npm exec --no -- tsp-client version
+
+# Generate client code
+npm exec --no -- tsp-client generate --output-dir ./generated
+
+# Initialize a new project
+npm exec --no -- tsp-client init --config ./tspconfig.yaml
+```
+
+### Option 2: Using environment variable
+
+```bash
+# Set repository root (adjust path as needed)
+export REPO_ROOT=$(git rev-parse --show-toplevel)
+
+# Get help
+npm exec --prefix "${REPO_ROOT}/eng/common/tsp-client" --no -- tsp-client --help
+
+# Check version
+npm exec --prefix "${REPO_ROOT}/eng/common/tsp-client" --no -- tsp-client version
+
+# Generate client code
+npm exec --prefix "${REPO_ROOT}/eng/common/tsp-client" --no -- tsp-client generate --output-dir ./generated
+
+# Initialize a new project
+npm exec --prefix "${REPO_ROOT}/eng/common/tsp-client" --no -- tsp-client init --config ./tspconfig.yaml
+```
+
+## CI/CD Best Practices
+
+```bash
+cd eng/common/tsp-client
+npm i --ignore-scripts --no-audit
+npm exec --no -- tsp-client generate --output-dir ./output
+```
+
+## Package Management
+
+### Updating tsp-client Version
+
+1. Edit `package.json` to update the version:
+
+   ```json
+   {
+     "dependencies": {
+       "@azure-tools/typespec-client-generator-cli": "0.8.0"
+     }
+   }
+   ```
+
+2. Update the lock file:
+
+   ```bash
+   npm install
+   ```
+
+3. Commit both `package.json` and `package-lock.json`