diff --git a/Sources/tart/Commands/Clone.swift b/Sources/tart/Commands/Clone.swift
index 799c57b..4013921 100644
--- a/Sources/tart/Commands/Clone.swift
+++ b/Sources/tart/Commands/Clone.swift
@@ -3,7 +3,20 @@ import Foundation
 import SystemConfiguration
 
 struct Clone: AsyncParsableCommand {
-  static var configuration = CommandConfiguration(abstract: "Clone a VM")
+  static var configuration = CommandConfiguration(
+    abstract: "Clone a VM",
+    discussion: """
+    Creates a local virtual machine by cloning either a remote or another local virtual machine.
+
+    Due to copy-on-write magic in Apple File System a cloned VM won't actually claim all the space right away.
+    Only changes to a cloned disk will be written and claim new space. By default, Tart checks available capacity
+    in Tart's home directory and checks if there is enough space for the worst possible scenario: when the whole disk
+    will be modified.
+
+    This behaviour can be disabled by setting TART_NO_AUTO_PRUNE environment variable. This might be helpful
+    for use cases when the original image is very big and a workload is known to only modify a fraction of the cloned disk.
+    """
+  )
 
   @Argument(help: "source VM name")
   var sourceName: String
diff --git a/Sources/tart/Commands/Prune.swift b/Sources/tart/Commands/Prune.swift
index be0c7f0..abb555e 100644
--- a/Sources/tart/Commands/Prune.swift
+++ b/Sources/tart/Commands/Prune.swift
@@ -105,6 +105,10 @@ struct Prune: AsyncParsableCommand {
   }
 
   static func reclaimIfNeeded(_ requiredBytes: UInt64, _ initiator: Prunable? = nil) throws {
+    if ProcessInfo.processInfo.environment.keys.contains("TART_NO_AUTO_PRUNE") {
+      return
+    }
+
     SentrySDK.configureScope { scope in
       scope.setContext(value: ["requiredBytes": requiredBytes], key: "Prune")
     }
diff --git a/Sources/tart/Commands/Pull.swift b/Sources/tart/Commands/Pull.swift
index 6ffd6a9..c728689 100644
--- a/Sources/tart/Commands/Pull.swift
+++ b/Sources/tart/Commands/Pull.swift
@@ -3,7 +3,16 @@ import Dispatch
 import SwiftUI
 
 struct Pull: AsyncParsableCommand {
-  static var configuration = CommandConfiguration(abstract: "Pull a VM from a registry")
+  static var configuration = CommandConfiguration(
+    abstract: "Pull a VM from a registry",
+    discussion: """
+    Pulls a virtual machine from a remote OCI-compatible registry. Supports authorization via Keychain (see "tart login --help"),
+    Docker credential helpers defined in ~/.docker/config.json or via TART_REGISTRY_USERNAME/TART_REGISTRY_PASSWORD environment variables.
+
+    By default, Tart checks available capacity in Tart's home directory and tries to reclaim minimum possible storage for the remote image to fit via "tart prune".
+    This behaviour can be disabled by setting TART_NO_AUTO_PRUNE environment variable.
+    """
+  )
 
   @Argument(help: "remote VM name")
   var remoteName: String