diff --git a/src/Elastic.Documentation.Configuration/Codex/CodexConfiguration.cs b/src/Elastic.Documentation.Configuration/Codex/CodexConfiguration.cs
index aa5471ffe..67c919192 100644
--- a/src/Elastic.Documentation.Configuration/Codex/CodexConfiguration.cs
+++ b/src/Elastic.Documentation.Configuration/Codex/CodexConfiguration.cs
@@ -21,7 +21,7 @@ public record CodexConfiguration
 	public string SitePrefix { get; set; } = "/";
 
 	/// <summary>
-	/// The environment name for this codex (e.g., "engineering", "security").
+	/// The environment name for this codex (e.g., "internal", "security").
 	/// Used as part of the Elasticsearch index namespace.
 	/// </summary>
 	[YamlMember(Alias = "environment")]
diff --git a/src/Elastic.Documentation.LinkIndex/GitLinkIndexReader.cs b/src/Elastic.Documentation.LinkIndex/GitLinkIndexReader.cs
index b628d5cf0..8d263d046 100644
--- a/src/Elastic.Documentation.LinkIndex/GitLinkIndexReader.cs
+++ b/src/Elastic.Documentation.LinkIndex/GitLinkIndexReader.cs
@@ -28,7 +28,7 @@ public class GitLinkIndexReader : ILinkIndexReader, IDisposable
 	public GitLinkIndexReader(string environment, IFileSystem? fileSystem = null)
 	{
 		if (string.IsNullOrWhiteSpace(environment))
-			throw new ArgumentException("Environment must be specified in the codex configuration (e.g., 'engineering', 'security').", nameof(environment));
+			throw new ArgumentException("Environment must be specified in the codex configuration (e.g., 'internal', 'security').", nameof(environment));
 
 		_environment = environment;
 		_fileSystem = fileSystem ?? new FileSystem();
diff --git a/src/services/Elastic.Documentation.Search/Common/ElasticsearchClientAccessor.cs b/src/services/Elastic.Documentation.Search/Common/ElasticsearchClientAccessor.cs
index b49b02250..4d3cded9d 100644
--- a/src/services/Elastic.Documentation.Search/Common/ElasticsearchClientAccessor.cs
+++ b/src/services/Elastic.Documentation.Search/Common/ElasticsearchClientAccessor.cs
@@ -50,7 +50,7 @@ public ElasticsearchClientAccessor(
 	/// <summary>
 	/// Extracts the ruleset name from the index name.
 	/// Index name format: "semantic-docs-{namespace}-latest" -> ruleset: "docs-ruleset-{namespace}"
-	/// The namespace may contain hyphens (e.g., "codex-engineering"), so we extract everything
+	/// The namespace may contain hyphens (e.g., "codex-internal"), so we extract everything
 	/// between the "semantic-docs-" prefix and the "-latest" suffix.
 	/// </summary>
 	private static string? ExtractRulesetName(string indexName)
diff --git a/src/tooling/docs-builder/Commands/Codex/CodexCommands.cs b/src/tooling/docs-builder/Commands/Codex/CodexCommands.cs
index e81a1b34d..cbdfa2b6c 100644
--- a/src/tooling/docs-builder/Commands/Codex/CodexCommands.cs
+++ b/src/tooling/docs-builder/Commands/Codex/CodexCommands.cs
@@ -66,7 +66,7 @@ public async Task<int> CloneAndBuild(
 
 		if (string.IsNullOrWhiteSpace(codexConfig.Environment))
 		{
-			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'engineering', 'security').");
+			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'internal', 'security').");
 			return 1;
 		}
 
@@ -139,7 +139,7 @@ public async Task<int> Clone(
 
 		if (string.IsNullOrWhiteSpace(codexConfig.Environment))
 		{
-			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'engineering', 'security').");
+			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'internal', 'security').");
 			return 1;
 		}
 
@@ -187,7 +187,7 @@ public async Task<int> Build(
 
 		if (string.IsNullOrWhiteSpace(codexConfig.Environment))
 		{
-			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'engineering', 'security').");
+			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'internal', 'security').");
 			return 1;
 		}
 
diff --git a/src/tooling/docs-builder/Commands/Codex/CodexIndexCommand.cs b/src/tooling/docs-builder/Commands/Codex/CodexIndexCommand.cs
index 6b70e50de..4b19905c7 100644
--- a/src/tooling/docs-builder/Commands/Codex/CodexIndexCommand.cs
+++ b/src/tooling/docs-builder/Commands/Codex/CodexIndexCommand.cs
@@ -112,7 +112,7 @@ public async Task<int> Index(
 
 		if (string.IsNullOrWhiteSpace(codexConfig.Environment))
 		{
-			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'engineering', 'security').");
+			collector.EmitGlobalError("Codex configuration must specify an 'environment' (e.g., 'internal', 'security').");
 			return 1;
 		}