Load complete background process output and fix dialog layout

packages/server/src/background-processes/manager.ts

@@ -166,7 +166,7 @@ export class BackgroundProcessManager {
   async readOutput(
     workspaceId: string,
     processId: string,
-    options: { method?: "full" | "tail" | "head" | "grep"; pattern?: string; lines?: number },
+    options: { method?: "full" | "tail" | "head" | "grep"; pattern?: string; lines?: number; maxBytes?: number },
   ) {
     const outputPath = this.getOutputPath(workspaceId, processId)
     if (!existsSync(outputPath)) {
@@ -178,7 +178,7 @@ export class BackgroundProcessManager {
     const method = options.method ?? "full"
     const lineCount = options.lines ?? 10
 
-    const raw = await this.readOutputBytes(outputPath, sizeBytes)
+    const raw = await this.readOutputBytes(outputPath, sizeBytes, options.maxBytes)
     let content = raw
 
     switch (method) {
@@ -198,10 +198,11 @@ export class BackgroundProcessManager {
         content = raw
     }
 
+    const effectiveMaxBytes = options.maxBytes
     return {
       id: processId,
       content,
-      truncated: sizeBytes > MAX_OUTPUT_BYTES,
+      truncated: effectiveMaxBytes !== undefined && sizeBytes > effectiveMaxBytes,
       sizeBytes,
     }
   }
@@ -280,12 +281,12 @@ export class BackgroundProcessManager {
     return "error"
   }
 
-  private async readOutputBytes(outputPath: string, sizeBytes: number): Promise<string> {
+  private async readOutputBytes(outputPath: string, sizeBytes: number, maxBytes?: number): Promise<string> {
-    if (sizeBytes <= MAX_OUTPUT_BYTES) {
+    if (maxBytes === undefined || sizeBytes <= maxBytes) {
       return await fs.readFile(outputPath, "utf-8")
     }
 
-    const start = Math.max(0, sizeBytes - MAX_OUTPUT_BYTES)
+    const start = Math.max(0, sizeBytes - maxBytes)
     const file = await fs.open(outputPath, "r")
     const buffer = Buffer.alloc(sizeBytes - start)
     await file.read(buffer, 0, buffer.length, start)

packages/server/src/server/routes/background-processes.ts

@@ -16,6 +16,7 @@ const OutputQuerySchema = z.object({
   mode: z.enum(["full", "tail", "head", "grep"]).optional(),
   pattern: z.string().optional(),
   lines: z.coerce.number().int().positive().max(2000).optional(),
+  maxBytes: z.coerce.number().int().positive().optional(),
 })
 
 export function registerBackgroundProcessRoutes(app: FastifyInstance, deps: RouteDeps) {
@@ -66,6 +67,7 @@ export function registerBackgroundProcessRoutes(app: FastifyInstance, deps: Rout
           method,
           pattern: query.pattern,
           lines: query.lines,
+          maxBytes: query.maxBytes,
         })
       } catch (error) {
         reply.code(400)

packages/ui/src/components/background-process-output-dialog.tsx

@@ -26,7 +26,7 @@ export function BackgroundProcessOutputDialog(props: BackgroundProcessOutputDial
 
     setLoading(true)
     serverApi
-      .fetchBackgroundProcessOutput(props.instanceId, process.id, { method: "full" })
+      .fetchBackgroundProcessOutput(props.instanceId, process.id, { method: "full", maxBytes: undefined })
       .then((response) => {
         if (!active) return
         setOutput(response.content)
@@ -65,18 +65,20 @@ export function BackgroundProcessOutputDialog(props: BackgroundProcessOutputDial
         <Dialog.Overlay class="modal-overlay" />
         <div class="fixed inset-0 z-50 flex items-center justify-center p-4">
           <Dialog.Content class="modal-surface w-full max-w-5xl max-h-[90vh] flex flex-col overflow-hidden">
-            <div class="flex items-center justify-between px-6 py-4 border-b border-base">
+            <div class="flex items-start justify-between px-6 py-4 border-b border-base gap-4">
-            <div class="flex flex-col">
+              <div class="flex-1 min-w-0">
-              <Dialog.Title class="text-lg font-semibold text-primary">Background Output</Dialog.Title>
+                <Dialog.Title class="text-lg font-semibold text-primary">Background Output</Dialog.Title>
-              <Show when={props.process}>
+                <Show when={props.process}>
-                <span class="text-xs text-secondary">
+                  <span class="text-xs text-secondary block">
-                  {props.process?.title} · {props.process?.id}
+                    {props.process?.title} · {props.process?.id}
-                </span>
+                  </span>
-                <span class="text-xs text-secondary mt-1 break-words">{props.process?.command}</span>
+                  <span class="text-xs text-secondary mt-1 block truncate" title={props.process?.command}>
-              </Show>
+                    {props.process?.command}
-            </div>
+                  </span>
+                </Show>
+              </div>
 
-              <button type="button" class="button-tertiary" onClick={props.onClose}>
+              <button type="button" class="button-tertiary flex-shrink-0" onClick={props.onClose}>
                 Close
               </button>
             </div>
@@ -88,7 +90,7 @@ export function BackgroundProcessOutputDialog(props: BackgroundProcessOutputDial
                 <Show when={truncated()}>
                   <p class="text-xs text-secondary mb-2">Output truncated for display.</p>
                 </Show>
-                <pre class="text-xs whitespace-pre-wrap break-words text-primary bg-surface-secondary border border-base rounded-md p-4">
+                <pre class="text-xs whitespace-pre-wrap break-all text-primary bg-surface-secondary border border-base rounded-md p-4 font-mono">
                   {output()}
                 </pre>
               </Show>

packages/ui/src/lib/api-client.ts

@@ -247,7 +247,7 @@ export const serverApi = {
   fetchBackgroundProcessOutput(
     instanceId: string,
     processId: string,
-    options?: { method?: "full" | "tail" | "head" | "grep"; pattern?: string; lines?: number },
+    options?: { method?: "full" | "tail" | "head" | "grep"; pattern?: string; lines?: number; maxBytes?: number },
   ): Promise<BackgroundProcessOutputResponse> {
     const params = new URLSearchParams()
     if (options?.method) {
@@ -259,6 +259,9 @@ export const serverApi = {
     if (options?.lines) {
       params.set("lines", String(options.lines))
     }
+    if (options?.maxBytes !== undefined) {
+      params.set("maxBytes", String(options.maxBytes))
+    }
     const query = params.toString()
     const suffix = query ? `?${query}` : ""
     return request<BackgroundProcessOutputResponse>(