diff --git a/Package.resolved b/Package.resolved
index 4bcd2af..8649a6c 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -1,6 +1,15 @@
 {
-  "originHash" : "3969417c2a67000e225174da55741dc4261b615b990ae4ce381417f06c5e9099",
+  "originHash" : "5d36627594955e7c1e9d5ca6b02c23ee9dc8e0d4ce73dc310b34fa6d1b966434",
   "pins" : [
+    {
+      "identity" : "swift-argument-parser",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-argument-parser",
+      "state" : {
+        "revision" : "626b5b7b2f45e1b0b1c6f4a309296d1d21d7311b",
+        "version" : "1.7.1"
+      }
+    },
     {
       "identity" : "swift-docc-plugin",
       "kind" : "remoteSourceControl",
diff --git a/Package.swift b/Package.swift
index 96d3ebf..8fc7ace 100644
--- a/Package.swift
+++ b/Package.swift
@@ -5,78 +5,93 @@ import CompilerPluginSupport
 import PackageDescription
 
 let package = Package(
-    name: "p4rse",
-    platforms: [ .iOS(.v17), .macOS(.v13)],
-    products: [
-        // Products define the executables and libraries a package produces, making them visible to other packages.
-        .library(
-            name: "P4Compiler",
-            targets: ["P4Compiler"]
-        ),
-        .library(
-            name: "Common",
-            targets: ["Common"]
-        ),
-        .library(
-            name: "P4Lang",
-            targets: ["P4Lang"]
-        ),
-        .library(
-            name: "P4Runtime",
-            targets: ["P4Runtime"]
-        ),
-    ],
-    dependencies: [
-        .package(path: "./tree-sitter-p4"),
-        .package(url: "https://github.com/tree-sitter/swift-tree-sitter", revision: "main"),
-        .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
-        .package(url: "https://github.com/swiftlang/swift-syntax", from: "602.0.0"),
-    ],
-    targets: [
-        .macro(
-            name: "Macros",
-            dependencies: [
-                .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
-                .product(name: "SwiftCompilerPlugin", package: "swift-syntax"),
-            ],
-            swiftSettings: [.enableExperimentalFeature("CodeItemMacros")]),
-        .target(
-            name: "P4Compiler",
-            dependencies: [
-                .product(name: "SwiftTreeSitter", package: "swift-tree-sitter"),
-                .product(name: "SwiftTreeSitterLayer", package: "swift-tree-sitter"),
-                .product(name: "TreeSitterP4", package: "tree-sitter-p4"),
-                .target(name: "TreeSitterExtensions"),
-                .target(name: "Common"),
-                .target(name: "P4Lang"),
-                .target(name: "P4Runtime"),
-            ],
-            swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
-        ),
-        .target(
-            name: "TreeSitterExtensions",
-            dependencies: [
-                .product(name: "SwiftTreeSitter", package: "swift-tree-sitter"),
-                .product(name: "SwiftTreeSitterLayer", package: "swift-tree-sitter"),
-            ],
-        ),
-        .target(
-            name: "Common",
-            dependencies: ["Macros"],
-            swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
-        ),
-        .target(
-            name: "P4Lang",
-            dependencies: ["Common"]
-        ),
-        .target(
-            name: "P4Runtime",
-            dependencies: ["P4Lang", "Common"]
-        ),
-        .testTarget(
-            name: "Tests",
-            dependencies: ["P4Compiler", "P4Runtime", "P4Lang", "Macros", "TreeSitterExtensions", "Common"],
-            swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
-        ),
-    ],
+  name: "p4ce",
+  platforms: [.iOS(.v17), .macOS(.v13)],
+  products: [
+    // Products define the executables and libraries a package produces, making them visible to other packages.
+    .library(
+      name: "P4Compiler",
+      targets: ["P4Compiler"]
+    ),
+    .library(
+      name: "Common",
+      targets: ["Common"]
+    ),
+    .library(
+      name: "P4Lang",
+      targets: ["P4Lang"]
+    ),
+    .library(
+      name: "P4Runtime",
+      targets: ["P4Runtime"]
+    ),
+    .executable(
+      name: "p4ce",
+      targets: ["Cli"]
+    ),
+  ],
+  dependencies: [
+    .package(path: "./tree-sitter-p4"),
+    .package(url: "https://github.com/tree-sitter/swift-tree-sitter", revision: "main"),
+    .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
+    .package(url: "https://github.com/swiftlang/swift-syntax", from: "602.0.0"),
+    .package(url: "https://github.com/apple/swift-argument-parser", from: "1.0.0"),
+  ],
+  targets: [
+    .macro(
+      name: "Macros",
+      dependencies: [
+        .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
+        .product(name: "SwiftCompilerPlugin", package: "swift-syntax"),
+      ],
+      swiftSettings: [.enableExperimentalFeature("CodeItemMacros")]),
+    .target(
+      name: "P4Compiler",
+      dependencies: [
+        .product(name: "SwiftTreeSitter", package: "swift-tree-sitter"),
+        .product(name: "SwiftTreeSitterLayer", package: "swift-tree-sitter"),
+        .product(name: "TreeSitterP4", package: "tree-sitter-p4"),
+        .target(name: "TreeSitterExtensions"),
+        .target(name: "Common"),
+        .target(name: "P4Lang"),
+        .target(name: "P4Runtime"),
+      ],
+      swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
+    ),
+    .target(
+      name: "TreeSitterExtensions",
+      dependencies: [
+        .product(name: "SwiftTreeSitter", package: "swift-tree-sitter"),
+        .product(name: "SwiftTreeSitterLayer", package: "swift-tree-sitter"),
+      ],
+    ),
+    .target(
+      name: "Common",
+      dependencies: ["Macros"],
+      swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
+    ),
+    .target(
+      name: "P4Lang",
+      dependencies: ["Common"]
+    ),
+    .target(
+      name: "P4Runtime",
+      dependencies: ["P4Lang", "Common"]
+    ),
+    .executableTarget(
+      name: "Cli",
+      dependencies: [
+        "Common", "P4Lang", "P4Compiler", "P4Runtime", "Macros",
+        .product(name: "ArgumentParser", package: "swift-argument-parser"),
+      ],
+      swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
+    ),
+    .testTarget(
+      name: "Tests",
+      dependencies: [
+        "P4Compiler", "P4Runtime", "P4Lang", "Macros", "TreeSitterExtensions", "Common",
+      ],
+      swiftSettings: [.enableExperimentalFeature("CodeItemMacros")],
+    ),
+  ],
 )
diff --git a/README.md b/README.md
index 0833080..353fc3f 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,7 @@ where `<component>` is one of:
 4. `common`: For any Swift-based components common to the entire project (and macros).
 5. `documentation`: For any documentation updates.
 6. `testing`: For Swift-based tests.
+7. `cli`: For Cli components.
 
 where `<subcomponent>` can be more free-form and `<change>` is a pithy description of the changes in the commit.
 
diff --git a/Sources/Cli/main.swift b/Sources/Cli/main.swift
new file mode 100644
index 0000000..5416dbe
--- /dev/null
+++ b/Sources/Cli/main.swift
@@ -0,0 +1,27 @@
+// p4rse, Copyright 2026, Will Hawkins
+//
+// This file is part of p4rse.
+//
+// This file is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import ArgumentParser
+import Darwin
+import Common
+@main
+struct Cli: ParsableCommand {
+    public func run() throws {
+      let e = ErrorWithLocation(sourceLocation: SourceLocation(1, 5), withError: "Testing")
+      print(e.format())
+    }
+}