live output from shell tool (#573)

packages/server/src/tools/shell.ts

@@ -123,6 +123,7 @@ export class ShellTool extends BaseTool<ShellToolParams, ToolResult> {
   async execute(
     params: ShellToolParams,
     abortSignal: AbortSignal,
+    onOutputChunk?: (chunk: string) => void,
   ): Promise<ToolResult> {
     const validationError = this.validateToolParams(params);
     if (validationError) {
@@ -157,6 +158,9 @@ export class ShellTool extends BaseTool<ShellToolParams, ToolResult> {
       const str = data.toString();
       stdout += str;
       output += str;
+      if (onOutputChunk) {
+        onOutputChunk(str);
+      }
     });
 
     let stderr = '';
@@ -174,6 +178,9 @@ export class ShellTool extends BaseTool<ShellToolParams, ToolResult> {
       }
       stderr += str;
       output += str;
+      if (onOutputChunk) {
+        onOutputChunk(str);
+      }
     });
 
     let error: Error | null = null;

packages/server/src/tools/tools.ts

@@ -64,7 +64,11 @@ export interface Tool<
    * @param params Parameters for the tool execution
    * @returns Result of the tool execution
    */
-  execute(params: TParams, signal: AbortSignal): Promise<TResult>;
+  execute(
+    params: TParams,
+    signal: AbortSignal,
+    onOutputChunk?: (chunk: string) => void,
+  ): Promise<TResult>;
 }
 
 /**
@@ -144,7 +148,11 @@ export abstract class BaseTool<
    * @param signal AbortSignal for tool cancellation
    * @returns Result of the tool execution
    */
-  abstract execute(params: TParams, signal: AbortSignal): Promise<TResult>;
+  abstract execute(
+    params: TParams,
+    signal: AbortSignal,
+    onOutputChunk?: (chunk: string) => void,
+  ): Promise<TResult>;
 }
 
 export interface ToolResult {