diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/ActionExtensions/Action+performAndHandleResult.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/ActionExtensions/Action+performAndHandleResult.swift
index 4edf038f8b..64f391e035 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/ActionExtensions/Action+performAndHandleResult.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/ActionExtensions/Action+performAndHandleResult.swift
@@ -17,7 +17,7 @@ extension AsyncAction {
     /// - Parameter logHandle: The log handle to write encountered warnings and errors to.
     ///
     /// - Throws: `ErrorsEncountered` if any errors are produced while performing the action.
-    public mutating func performAndHandleResult(logHandle: LogHandle = .standardOutput) async throws {
+    public func performAndHandleResult(logHandle: LogHandle = .standardOutput) async throws {
         var logHandle = logHandle
         // Perform the Action and collect the result
         let result = try await perform(logHandle: &logHandle)
diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Convert.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Convert.swift
index ab98c07118..fd2cfe99f4 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Convert.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Convert.swift
@@ -674,7 +674,7 @@ extension Docc {
         }
 
         public func run() async throws {
-            var convertAction = try ConvertAction(fromConvertCommand: self)
+            let convertAction = try ConvertAction(fromConvertCommand: self)
             try await convertAction.performAndHandleResult()
         }
         
diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/EmitGeneratedCuration.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/EmitGeneratedCuration.swift
index c0d953efbb..0722f04279 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/EmitGeneratedCuration.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/EmitGeneratedCuration.swift
@@ -157,7 +157,7 @@ extension Docc.ProcessCatalog {
         }
         
         func run() async throws {
-            var action = try EmitGeneratedCurationAction(fromCommand: self)
+            let action = try EmitGeneratedCurationAction(fromCommand: self)
             try await action.performAndHandleResult()
         }
     }
diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Index.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Index.swift
index 224c9b267c..273486325d 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Index.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Index.swift
@@ -37,7 +37,7 @@ extension Docc {
         }
 
         public func run() async throws {
-            var indexAction = try IndexAction(fromIndexCommand: self)
+            let indexAction = try IndexAction(fromIndexCommand: self)
             try await indexAction.performAndHandleResult()
         }
     }
diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Init.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Init.swift
index 51d6ba34d1..2810a8d2e1 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Init.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Init.swift
@@ -25,7 +25,7 @@ extension Docc {
         public var initOptions: InitOptions
         
         public func run() async throws {
-            var initAction = try InitAction(fromInitOptions: initOptions)
+            let initAction = try InitAction(fromInitOptions: initOptions)
             try await initAction.performAndHandleResult()
         }
     }
diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Merge.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Merge.swift
index cde3cae489..d4c4179c9e 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Merge.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Merge.swift
@@ -169,7 +169,7 @@ extension Docc {
         
         public func run() async throws {
             // Initialize a `ConvertAction` from the current options in the `Convert` command.
-            var convertAction = MergeAction(
+            let convertAction = MergeAction(
                 archives: archives,
                 landingPageInfo: .synthesize(.init(name: synthesizedLandingPageName, kind: synthesizedLandingPageKind, style: synthesizedLandingPageTopicsStyle)),
                 outputURL: outputURL,
diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Preview.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Preview.swift
index b7898f87cd..467799e8f0 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Preview.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/Preview.swift
@@ -44,7 +44,7 @@ extension Docc {
         }
 
         public func run() async throws {
-            var previewAction = try PreviewAction(fromPreviewOptions: previewOptions)
+            let previewAction = try PreviewAction(fromPreviewOptions: previewOptions)
             try await previewAction.performAndHandleResult()
         }
     }
diff --git a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/TransformForStaticHosting.swift b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/TransformForStaticHosting.swift
index 96d3d9d894..d7af3cd6a3 100644
--- a/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/TransformForStaticHosting.swift
+++ b/Sources/SwiftDocCUtilities/ArgumentParsing/Subcommands/TransformForStaticHosting.swift
@@ -63,7 +63,7 @@ extension Docc.ProcessArchive {
         }
         
         func run() async throws {
-            var action = try TransformForStaticHostingAction(fromCommand: self)
+            let action = try TransformForStaticHostingAction(fromCommand: self)
             try await action.performAndHandleResult()
         }
     }