fix(coding-agent): stabilize edit diff previews closes #3134

packages/coding-agent/src/core/extensions/types.ts

@@ -379,6 +379,8 @@ export interface ToolDefinition<TParams extends TSchema = TSchema, TDetails = un
 	promptGuidelines?: string[];
 	/** Parameter schema (TypeBox) */
 	parameters: TParams;
+	/** Controls whether ToolExecutionComponent renders the standard colored shell or the tool renders its own framing. */
+	renderShell?: "default" | "self";
 
 	/** Optional compatibility shim to prepare raw tool call arguments before schema validation. Must return an object conforming to TParams. */
 	prepareArguments?: (args: unknown) => Static<TParams>;