diff --git a/src/Runner.Common/Constants.cs b/src/Runner.Common/Constants.cs
index e0781c21f..c2d7d5396 100644
--- a/src/Runner.Common/Constants.cs
+++ b/src/Runner.Common/Constants.cs
@@ -189,6 +189,11 @@ namespace GitHub.Runner.Common
                 public static readonly string StepDebug = "ACTIONS_STEP_DEBUG";
             }
 
+            public static class Agent
+            {
+                public static readonly string ToolsDirectory = "agent.ToolsDirectory";
+            }
+
             public static class System
             {
                 //
diff --git a/src/Runner.Common/HostContext.cs b/src/Runner.Common/HostContext.cs
index 791966c0f..f110bbd40 100644
--- a/src/Runner.Common/HostContext.cs
+++ b/src/Runner.Common/HostContext.cs
@@ -229,8 +229,9 @@ namespace GitHub.Runner.Common
                     break;
 
                 case WellKnownDirectory.Tools:
-                    path = Environment.GetEnvironmentVariable("RUNNER_TOOL_CACHE");
-                    
+                    // TODO: Coallesce to just check RUNNER_TOOL_CACHE when images stabilize
+                    path = Environment.GetEnvironmentVariable("RUNNER_TOOL_CACHE") ?? Environment.GetEnvironmentVariable("RUNNER_TOOLSDIRECTORY") ?? Environment.GetEnvironmentVariable("AGENT_TOOLSDIRECTORY") ?? Environment.GetEnvironmentVariable(Constants.Variables.Agent.ToolsDirectory);
+
                     if (string.IsNullOrEmpty(path))
                     {
                         path = Path.Combine(