diff --git a/internal/lsp/capabilities_test.go b/internal/lsp/capabilities_test.go
new file mode 100644
index 00000000..a1962cd1
--- /dev/null
+++ b/internal/lsp/capabilities_test.go
@@ -0,0 +1,52 @@
+package lsp
+
+import (
+	"context"
+	"testing"
+
+	"github.com/sourcegraph/jsonrpc2"
+
+	"github.com/open-policy-agent/regal/internal/lsp/clients"
+	"github.com/open-policy-agent/regal/internal/lsp/types"
+	"github.com/open-policy-agent/regal/internal/lsp/uri"
+	"github.com/open-policy-agent/regal/internal/testutil"
+)
+
+func TestInitializeExperimentalCapabilities(t *testing.T) {
+	t.Parallel()
+
+	ctx, cancel := context.WithCancel(t.Context())
+	defer cancel()
+
+	tempDir := t.TempDir()
+
+	clientHandler := func(_ context.Context, _ *jsonrpc2.Conn, _ *jsonrpc2.Request) (any, error) {
+		return struct{}{}, nil
+	}
+
+	_, connClient := createAndInitServer(t, ctx, tempDir, clientHandler)
+
+	request := types.InitializeParams{
+		RootURI:    uri.FromPath(clients.IdentifierGeneric, tempDir),
+		ClientInfo: types.ClientInfo{Name: "go test"},
+	}
+
+	var response types.InitializeResult
+	testutil.NoErr(connClient.Call(ctx, "initialize", request, &response))(t)
+
+	if response.Capabilities.Experimental == nil {
+		t.Fatal("expected experimental capabilities to be non-nil")
+	}
+
+	if !response.Capabilities.Experimental.ExplorerProvider {
+		t.Error("expected explorerProvider to be true")
+	}
+
+	if !response.Capabilities.Experimental.EvalProvider {
+		t.Error("expected evalProvider to be true")
+	}
+
+	if !response.Capabilities.Experimental.DebugProvider {
+		t.Error("expected debugProvider to be true")
+	}
+}
diff --git a/internal/lsp/server.go b/internal/lsp/server.go
index 7c584e03..54207878 100644
--- a/internal/lsp/server.go
+++ b/internal/lsp/server.go
@@ -1968,6 +1968,11 @@ func (l *LanguageServer) handleInitialize(ctx context.Context, params types.Init
 				},
 				Full: true,
 			},
+			Experimental: &types.ExperimentalCapabilities{
+				ExplorerProvider: true,
+				EvalProvider:     true,
+				DebugProvider:    true,
+			},
 		},
 	}
 
diff --git a/internal/lsp/types/types.go b/internal/lsp/types/types.go
index 21366fa0..5bc33f35 100644
--- a/internal/lsp/types/types.go
+++ b/internal/lsp/types/types.go
@@ -70,26 +70,41 @@ type (
 	}
 
 	ServerCapabilities struct {
-		CodeLensProvider           ResolveProviderOption   `json:"codeLensProvider"`
-		Workspace                  WorkspaceOptions        `json:"workspace"`
-		DiagnosticProvider         DiagnosticOptions       `json:"diagnosticProvider"`
-		CodeActionProvider         CodeActionOptions       `json:"codeActionProvider"`
-		ExecuteCommandProvider     ExecuteCommandOptions   `json:"executeCommandProvider"`
-		TextDocumentSyncOptions    TextDocumentSyncOptions `json:"textDocumentSync"`
-		CompletionProvider         CompletionOptions       `json:"completionProvider"`
-		InlayHintProvider          ResolveProviderOption   `json:"inlayHintProvider"`
-		DocumentLinkProvider       ResolveProviderOption   `json:"documentLinkProvider"`
-		SignatureHelpProvider      SignatureHelpOptions    `json:"signatureHelpProvider"`
-		SemanticTokensProvider     SemanticTokensOptions   `json:"semanticTokensProvider"`
-		DocumentHighlightProvider  bool                    `json:"documentHighlightProvider"`
-		HoverProvider              bool                    `json:"hoverProvider"`
-		DocumentFormattingProvider bool                    `json:"documentFormattingProvider"`
-		FoldingRangeProvider       bool                    `json:"foldingRangeProvider"`
-		DocumentSymbolProvider     bool                    `json:"documentSymbolProvider"`
-		WorkspaceSymbolProvider    bool                    `json:"workspaceSymbolProvider"`
-		DefinitionProvider         bool                    `json:"definitionProvider"`
-		SelectionRangeProvider     bool                    `json:"selectionRangeProvider"`
-		LinkedEditingRangeProvider bool                    `json:"linkedEditingRangeProvider"`
+		CodeLensProvider           ResolveProviderOption     `json:"codeLensProvider"`
+		Workspace                  WorkspaceOptions          `json:"workspace"`
+		DiagnosticProvider         DiagnosticOptions         `json:"diagnosticProvider"`
+		CodeActionProvider         CodeActionOptions         `json:"codeActionProvider"`
+		ExecuteCommandProvider     ExecuteCommandOptions     `json:"executeCommandProvider"`
+		TextDocumentSyncOptions    TextDocumentSyncOptions   `json:"textDocumentSync"`
+		CompletionProvider         CompletionOptions         `json:"completionProvider"`
+		InlayHintProvider          ResolveProviderOption     `json:"inlayHintProvider"`
+		DocumentLinkProvider       ResolveProviderOption     `json:"documentLinkProvider"`
+		SignatureHelpProvider      SignatureHelpOptions      `json:"signatureHelpProvider"`
+		SemanticTokensProvider     SemanticTokensOptions     `json:"semanticTokensProvider"`
+		DocumentHighlightProvider  bool                      `json:"documentHighlightProvider"`
+		HoverProvider              bool                      `json:"hoverProvider"`
+		DocumentFormattingProvider bool                      `json:"documentFormattingProvider"`
+		FoldingRangeProvider       bool                      `json:"foldingRangeProvider"`
+		DocumentSymbolProvider     bool                      `json:"documentSymbolProvider"`
+		WorkspaceSymbolProvider    bool                      `json:"workspaceSymbolProvider"`
+		DefinitionProvider         bool                      `json:"definitionProvider"`
+		SelectionRangeProvider     bool                      `json:"selectionRangeProvider"`
+		LinkedEditingRangeProvider bool                      `json:"linkedEditingRangeProvider"`
+		Experimental               *ExperimentalCapabilities `json:"experimental,omitempty"`
+	}
+
+	// ExperimentalCapabilities contains Regal-specific experimental LSP features
+	// that are not part of the standard LSP specification.
+	ExperimentalCapabilities struct {
+		// ExplorerProvider indicates whether the server supports the regal.explorer
+		// command and regal/showExplorerResult notification.
+		ExplorerProvider bool `json:"explorerProvider"`
+		// EvalProvider indicates whether the server supports the regal.eval
+		// command and regal/showEvalResult request.
+		EvalProvider bool `json:"evalProvider"`
+		// DebugProvider indicates whether the server supports the regal.debug
+		// command and regal/startDebugging request.
+		DebugProvider bool `json:"debugProvider"`
 	}
 
 	TextDocumentPositionParams struct {