feat(refactor): live zed-style codebase files autocomplete and context attachment

vibn-frontend/app/api/chat/route.ts

@@ -30,6 +30,7 @@ import {
 } from "@/lib/dev-container-git";
 import { buildDesignKitPromptSection } from "@/lib/design-kits/for-ai";
 import { buildCodebaseSummary } from "@/lib/ai/codebase-summary";
+import { execInDevContainer } from "@/lib/dev-container";
 import type { ChatMessage, ToolCall } from "@/lib/ai/gemini-chat";
 
 // C-01: Lowered from 15 → 8. Real workflows (scaffold → install →
@@ -404,6 +405,7 @@ export async function POST(request: Request) {
     workspace: string;
     mcp_token?: string;
     chatMode?: "vibe" | "collaborate" | "delegate";
+    attachedFiles?: string[];
   };
   try {
     body = await request.json();
@@ -411,7 +413,14 @@ export async function POST(request: Request) {
     return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
   }
 
-  const { thread_id, message, workspace, mcp_token, chatMode = "vibe" } = body;
+  const {
+    thread_id,
+    message,
+    workspace,
+    mcp_token,
+    chatMode = "vibe",
+    attachedFiles = [],
+  } = body;
   if (!thread_id || !message?.trim()) {
     return NextResponse.json(
       { error: "thread_id and message are required" },
@@ -529,6 +538,32 @@ export async function POST(request: Request) {
     chatMode,
   );
 
+  let fileContextsBlock = "";
+  if (
+    Array.isArray(attachedFiles) &&
+    attachedFiles.length > 0 &&
+    activeProject?.slug
+  ) {
+    fileContextsBlock =
+      "\n\n=== USER-ATTACHED CODE CONTEXT ===\nThe user has explicitly attached the following files to this conversation turn as active context. You MUST refer to these file states when writing your response or deciding edits:\n";
+    for (const f of attachedFiles) {
+      const safePath = String(f).replace(/\.\./g, "").replace(/^\//, "");
+      try {
+        const res = (await execInDevContainer({
+          projectId: activeProject.id,
+          command: `cat "/workspace/${activeProject.slug}/${safePath}" 2>/dev/null || echo "[File not found]"`,
+        })) as unknown as { exitCode: number; stdout: string };
+        fileContextsBlock += `\nFile: \`${safePath}\`\n\`\`\`\n${res.stdout}\n\`\`\`\n`;
+      } catch {
+        fileContextsBlock += `\nFile: \`${safePath}\`\n[Error reading file]\n`;
+      }
+    }
+  }
+
+  if (fileContextsBlock) {
+    systemPrompt += fileContextsBlock;
+  }
+
   // Sentry-as-product Stage 4: auto-surface unresolved errors at
   // chat-turn start. We pull the last 6 hours' unresolved issues
   // for the active project; if anything has fired ≥2 times, we

vibn-frontend/app/api/projects/[projectId]/files/route.ts

@@ -0,0 +1,63 @@
+import { NextResponse } from "next/server";
+import {
+  execInDevContainer,
+  ensureDevContainer,
+} from "../../../../../lib/dev-container";
+import { authSession } from "../../../../../lib/auth/session-server";
+import { queryOne } from "../../../../../lib/db-postgres";
+import type { VibnWorkspace } from "../../../../../lib/workspaces";
+
+export const dynamic = "force-dynamic";
+
+export async function GET(
+  req: Request,
+  ctx: { params: Promise<{ projectId: string }> },
+) {
+  try {
+    const { projectId } = await ctx.params;
+    const { searchParams } = new URL(req.url);
+    const workspace = searchParams.get("workspace") || "";
+
+    const session = await authSession();
+    if (!session?.user?.email || !workspace) {
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+    }
+
+    // Fetch project details to get the slug
+    const r = await queryOne<{ data: { slug: string } }>(
+      `SELECT data FROM fs_projects WHERE id = $1`,
+      [projectId],
+    );
+    if (!r?.data?.slug) {
+      return NextResponse.json({ error: "Project not found" }, { status: 404 });
+    }
+    const projectSlug = r.data.slug;
+
+    // Ensure the container is active
+    await ensureDevContainer({
+      projectId,
+      projectSlug,
+      projectName: projectSlug,
+      workspace: { slug: workspace } as unknown as VibnWorkspace,
+    });
+
+    // Run a fast find inside the dev container, excluding build/node_modules/git artifacts
+    const result = (await execInDevContainer({
+      projectId,
+      command: `find . -maxdepth 4 -not -path "*/node_modules/*" -not -path "*/.git/*" -not -path "*/.next/*" -not -path "*/dist/*" -not -path "*/build/*" | sort | sed 's|^\\./||'`,
+    })) as unknown as { exitCode: number; stdout: string };
+
+    if (result.exitCode !== 0) {
+      return NextResponse.json({ files: [] });
+    }
+
+    const files = result.stdout
+      .split("\n")
+      .map((f: string) => f.trim())
+      .filter((f: string) => f && f !== "." && f !== "..");
+
+    return NextResponse.json({ files });
+  } catch (err) {
+    return NextResponse.json({ error: String(err) }, { status: 500 });
+  }
+}

vibn-frontend/components/vibn-chat/chat-panel.tsx

@@ -882,6 +882,24 @@ export function ChatPanel({
   const [chatMode, setChatMode] = useState<"collaborate" | "vibe" | "delegate">(
     "vibe",
   );
+  const [projectFiles, setProjectFiles] = useState<string[]>([]);
+  const [attachedFiles, setAttachedFiles] = useState<string[]>([]);
+  const [showSuggestions, setShowSuggestions] = useState(false);
+  const [suggestionsFilter, setSuggestionsFilter] = useState("");
+  const [suggestionIndex, setSuggestionIndex] = useState(0);
+
+  // Fetch codebase files list inside the scoped project
+  useEffect(() => {
+    if (!projectId || !workspace || status !== "authenticated") return;
+    fetch(`/api/projects/${projectId}/files?workspace=${workspace}`)
+      .then((res) => res.json())
+      .then((data) => {
+        if (Array.isArray(data.files)) {
+          setProjectFiles(data.files);
+        }
+      })
+      .catch(() => {});
+  }, [projectId, workspace, status]);
   const [sending, setSending] = useState(false);
   const [showThreads, setShowThreads] = useState(false);
   const [mcpToken, setMcpToken] = useState<string | null>(null);
@@ -1149,6 +1167,7 @@ export function ChatPanel({
             throw new Error(err.error || `HTTP ${r.status}`);
           }
 
+          setAttachedFiles([]);
           setMessages((prev) => [
             ...prev,
             {
@@ -1170,10 +1189,13 @@ export function ChatPanel({
             workspace,
             mcp_token: mcpToken,
             chatMode,
+            attachedFiles,
           }),
           signal: controller.signal,
         });
 
+        setAttachedFiles([]);
+
         if (!res.ok || !res.body) throw new Error("Stream failed");
 
         const reader = res.body.getReader();
@@ -1389,6 +1411,7 @@ export function ChatPanel({
       unifiedProjectShell,
       chatMode,
       projectId,
+      attachedFiles,
     ],
   );
 
@@ -1419,7 +1442,50 @@ export function ChatPanel({
       window.removeEventListener("vibn:chat-prompt", onPrompt as EventListener);
   }, [sendMessage, projectId]);
 
+  const handleInputChange = (val: string) => {
+    setInput(val);
+    const match = val.match(/\/(\S*)$/);
+    if (match) {
+      setShowSuggestions(true);
+      setSuggestionsFilter(match[1] || "");
+      setSuggestionIndex(0);
+    } else {
+      setShowSuggestions(false);
+    }
+  };
+
   const handleKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
+    if (showSuggestions) {
+      const filtered = projectFiles
+        .filter((f) =>
+          f.toLowerCase().includes(suggestionsFilter.toLowerCase()),
+        )
+        .slice(0, 8);
+
+      if (e.key === "ArrowDown") {
+        e.preventDefault();
+        setSuggestionIndex((prev) => (prev + 1) % Math.max(1, filtered.length));
+      } else if (e.key === "ArrowUp") {
+        e.preventDefault();
+        setSuggestionIndex(
+          (prev) => (prev - 1 + filtered.length) % Math.max(1, filtered.length),
+        );
+      } else if (e.key === "Enter" || e.key === "Tab") {
+        e.preventDefault();
+        if (filtered[suggestionIndex]) {
+          const selectedFile = filtered[suggestionIndex];
+          const before = input.slice(0, input.lastIndexOf("/"));
+          setInput(before + " ");
+          if (!attachedFiles.includes(selectedFile)) {
+            setAttachedFiles((prev) => [...prev, selectedFile]);
+          }
+          setShowSuggestions(false);
+        }
+      } else if (e.key === "Escape") {
+        e.preventDefault();
+        setShowSuggestions(false);
+      }
+    } else {
       if (e.key === "Enter" && !e.shiftKey) {
         e.preventDefault();
         sendMessage();
@@ -1427,6 +1493,7 @@ export function ChatPanel({
         e.preventDefault();
         cancelMessage();
       }
+    }
   };
 
   // Slide-out chat hidden until signed in. Structural project shell always
@@ -1676,6 +1743,7 @@ export function ChatPanel({
           borderTop: "1px solid #e8e4dc",
           background: "#faf8f5",
           flexShrink: 0,
+          position: "relative",
         }}
       >
         {/* Chat Mode Toggle */}
@@ -1806,6 +1874,149 @@ export function ChatPanel({
             Read-only mode — add your MCP token in Settings to enable actions.
           </div>
         )}
+        {/* File Autocomplete Suggestions */}
+        {showSuggestions &&
+          (() => {
+            const filtered = projectFiles
+              .filter((f) =>
+                f.toLowerCase().includes(suggestionsFilter.toLowerCase()),
+              )
+              .slice(0, 8);
+            if (filtered.length === 0) return null;
+            return (
+              <div
+                style={{
+                  position: "absolute",
+                  bottom: "calc(100% - 10px)",
+                  left: 14,
+                  right: 14,
+                  background: "#fff",
+                  border: "1px solid #e8e4dc",
+                  borderRadius: 8,
+                  boxShadow:
+                    "0 -4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.02)",
+                  zIndex: 1000,
+                  maxHeight: 200,
+                  overflowY: "auto",
+                  padding: "4px 0",
+                }}
+              >
+                <div
+                  style={{
+                    fontSize: "0.65rem",
+                    fontWeight: 600,
+                    color: "#a09a90",
+                    padding: "6px 12px 4px",
+                    borderBottom: "1px solid #f0ede8",
+                    marginBottom: 4,
+                    textTransform: "uppercase",
+                    letterSpacing: "0.05em",
+                  }}
+                >
+                  Codebase Files
+                </div>
+                {filtered.map((file, idx) => (
+                  <div
+                    key={file}
+                    onClick={() => {
+                      const before = input.slice(0, input.lastIndexOf("/"));
+                      setInput(before + " ");
+                      if (!attachedFiles.includes(file)) {
+                        setAttachedFiles((prev) => [...prev, file]);
+                      }
+                      setShowSuggestions(false);
+                    }}
+                    onMouseEnter={() => setSuggestionIndex(idx)}
+                    style={{
+                      padding: "6px 12px",
+                      fontSize: "0.76rem",
+                      fontFamily: "var(--font-mono), monospace",
+                      color: idx === suggestionIndex ? "#3d5afe" : "#1a1a1a",
+                      background:
+                        idx === suggestionIndex ? "#3d5afe0c" : "transparent",
+                      cursor: "pointer",
+                      display: "flex",
+                      justifyContent: "space-between",
+                      alignItems: "center",
+                    }}
+                  >
+                    <span
+                      style={{
+                        overflow: "hidden",
+                        textOverflow: "ellipsis",
+                        whiteSpace: "nowrap",
+                      }}
+                    >
+                      📄 {file}
+                    </span>
+                    {idx === suggestionIndex && (
+                      <span
+                        style={{
+                          fontSize: "0.6rem",
+                          color: "#3d5afe",
+                          opacity: 0.7,
+                          fontFamily: "var(--font-inter), sans-serif",
+                        }}
+                      >
+                        press Enter
+                      </span>
+                    )}
+                  </div>
+                ))}
+              </div>
+            );
+          })()}
+
+        {/* Attached Files Chips */}
+        {attachedFiles.length > 0 && (
+          <div
+            style={{
+              display: "flex",
+              flexWrap: "wrap",
+              gap: 6,
+              marginBottom: 8,
+            }}
+          >
+            {attachedFiles.map((file) => (
+              <div
+                key={file}
+                style={{
+                  display: "flex",
+                  alignItems: "center",
+                  gap: 6,
+                  background: "#eef2ff",
+                  border: "1px solid #c7d2fe",
+                  borderRadius: 6,
+                  padding: "4px 8px",
+                  fontSize: "0.7rem",
+                  color: "#312e81",
+                  fontFamily: "var(--font-mono), monospace",
+                }}
+              >
+                <span>📄 {file.split("/").pop()}</span>
+                <button
+                  type="button"
+                  onClick={() =>
+                    setAttachedFiles((prev) => prev.filter((f) => f !== file))
+                  }
+                  style={{
+                    background: "none",
+                    border: "none",
+                    padding: 0,
+                    cursor: "pointer",
+                    color: "#4338ca",
+                    display: "flex",
+                    alignItems: "center",
+                  }}
+                  title="Remove file"
+                >
+                  <X style={{ width: 12, height: 12 }} />
+                </button>
+              </div>
+            ))}
+          </div>
+        )}
+
         <ProjectPreviewChatInputWrap unifiedShell={unifiedProjectShell}>
           {(selectToggle) => (
             <div
@@ -1823,7 +2034,7 @@ export function ChatPanel({
               <textarea
                 ref={inputRef}
                 value={input}
-                onChange={(e) => setInput(e.target.value)}
+                onChange={(e) => handleInputChange(e.target.value)}
                 onKeyDown={handleKeyDown}
                 placeholder={
                   sending ? "Esc to stop generating…" : "Ask Vibn AI anything…"

vibn-frontend/lib/ai/codebase-summary.ts

@@ -1,10 +1,4 @@
-import { NextResponse } from "next/server";
+import { ensureDevContainer, execInDevContainer } from "@/lib/dev-container";
-import { query } from "@/lib/db-postgres";
-import {
-  ensureDevContainer,
-  execInDevContainer,
-  getDevContainerStatus,
-} from "@/lib/dev-container";
 import { authSession } from "@/lib/auth/session-server";
 
 /**
@@ -19,7 +13,9 @@ export async function buildCodebaseSummary(
   if (!projectId || !projectSlug) return "";
 
   try {
-    const session = await authSession();
+    const session = (await authSession()) as unknown as {
+      workspace?: import("@/lib/workspaces").VibnWorkspace;
+    };
     if (!session?.workspace) return "";
 
     // Ensure the container is actually running before we try to exec inside it
@@ -61,7 +57,7 @@ export async function buildCodebaseSummary(
       command: bashScript,
     });
 
-    if (result.exitCode !== 0 || !result.stdout.trim()) {
+    if (result.code !== 0 || !result.stdout.trim()) {
       return "";
     }
 

vibn-frontend/lib/dev-container.ts

@@ -747,7 +747,7 @@ export async function probeDevServerReadiness(
       command: probeCmd,
       timeoutMs: 310_000,
     });
-    if (r.exitCode === 0) {
+    if (r.code === 0) {
       await query(
         `UPDATE fs_dev_servers SET state = 'running' WHERE id = $1 AND project_id = $2 AND state != 'stopped'`,
         [serverId, projectId],
@@ -759,7 +759,7 @@ export async function probeDevServerReadiness(
           projectId,
           serverId,
           port,
-          exitCode: r.exitCode,
+          exitCode: r.code,
           stdout: (r.stdout || "").slice(0, 600),
         }),
       );
@@ -767,7 +767,7 @@ export async function probeDevServerReadiness(
         `UPDATE fs_dev_servers SET state = 'failed' WHERE id = $1 AND project_id = $2 AND state != 'stopped'`,
         [serverId, projectId],
       );
-      throw new Error(`Probe failed with exit code ${r.exitCode}: ${r.stdout}`);
+      throw new Error(`Probe failed with exit code ${r.code}: ${r.stdout}`);
     }
   } catch (err) {
     console.error(