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.agents/skills/turborepo/references/boundaries/RULE.md

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+# Boundaries
+
+**Experimental feature** - See [RFC](https://github.com/vercel/turborepo/discussions/9435)
+
+Full docs: https://turborepo.dev/docs/reference/boundaries
+
+Boundaries enforce package isolation by detecting:
+
+1. Imports of files outside the package's directory
+2. Imports of packages not declared in `package.json` dependencies
+
+## Usage
+
+```bash
+turbo boundaries
+```
+
+Run this to check for workspace violations across your monorepo.
+
+## Tags
+
+Tags allow you to create rules for which packages can depend on each other.
+
+### Adding Tags to a Package
+
+```json
+// packages/ui/turbo.json
+{
+  "tags": ["internal"]
+}
+```
+
+### Configuring Tag Rules
+
+Rules go in root `turbo.json`:
+
+```json
+// turbo.json
+{
+  "boundaries": {
+    "tags": {
+      "public": {
+        "dependencies": {
+          "deny": ["internal"]
+        }
+      }
+    }
+  }
+}
+```
+
+This prevents `public`-tagged packages from importing `internal`-tagged packages.
+
+### Rule Types
+
+**Allow-list approach** (only allow specific tags):
+
+```json
+{
+  "boundaries": {
+    "tags": {
+      "public": {
+        "dependencies": {
+          "allow": ["public"]
+        }
+      }
+    }
+  }
+}
+```
+
+**Deny-list approach** (block specific tags):
+
+```json
+{
+  "boundaries": {
+    "tags": {
+      "public": {
+        "dependencies": {
+          "deny": ["internal"]
+        }
+      }
+    }
+  }
+}
+```
+
+**Restrict dependents** (who can import this package):
+
+```json
+{
+  "boundaries": {
+    "tags": {
+      "private": {
+        "dependents": {
+          "deny": ["public"]
+        }
+      }
+    }
+  }
+}
+```
+
+### Using Package Names
+
+Package names work in place of tags:
+
+```json
+{
+  "boundaries": {
+    "tags": {
+      "private": {
+        "dependents": {
+          "deny": ["@repo/my-pkg"]
+        }
+      }
+    }
+  }
+}
+```
+
+## Key Points
+
+- Rules apply transitively (dependencies of dependencies)
+- Helps enforce architectural boundaries at scale
+- Catches violations before runtime/build errors