feat(listen): memory tools (#1495)

Co-authored-by: Letta Code <noreply@letta.com>

src/agent/memoryFilesystem.ts

@@ -375,8 +375,11 @@ export async function applyMemfsFlags(
 export async function isLettaCloud(): Promise<boolean> {
   const { getServerUrl } = await import("./client");
   const serverUrl = getServerUrl();
+
   return (
-    serverUrl.includes("api.letta.com") || process.env.LETTA_MEMFS_LOCAL === "1"
+    serverUrl.includes("api.letta.com") ||
+    process.env.LETTA_MEMFS_LOCAL === "1" ||
+    process.env.LETTA_API_KEY === "local-desktop"
   );
 }
 

src/tools/impl/Memory.ts

@@ -269,6 +269,9 @@ export async function memory(args: MemoryArgs): Promise<MemoryResult> {
     };
   }
 
+  // Emit memory_updated push event so web UI auto-refreshes
+  emitMemoryUpdated(affectedPaths);
+
   return {
     message: `Memory ${command} applied and pushed (${commitResult.sha?.slice(0, 7) ?? "unknown"}).`,
   };
@@ -599,3 +602,36 @@ function requireString(
   }
   return value;
 }
+
+/**
+ * Emit a `memory_updated` push event over the WebSocket so the web UI
+ * can auto-refresh its memory index without polling.
+ */
+function emitMemoryUpdated(affectedPaths: string[]): void {
+  try {
+    // Lazy-import to avoid circular deps — this file is loaded before WS infra
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
+    const { getActiveRuntime } =
+      require("../../websocket/listener/runtime") as {
+        getActiveRuntime: () => {
+          socket: { readyState: number; send: (data: string) => void } | null;
+        } | null;
+      };
+
+    const runtime = getActiveRuntime();
+    const socket = runtime?.socket;
+    if (!socket || socket.readyState !== 1 /* WebSocket.OPEN */) {
+      return;
+    }
+
+    socket.send(
+      JSON.stringify({
+        type: "memory_updated",
+        affected_paths: affectedPaths,
+        timestamp: Date.now(),
+      }),
+    );
+  } catch {
+    // Best-effort — never break tool execution for a push event
+  }
+}

src/types/protocol_v2.ts

@@ -136,6 +136,7 @@ export interface DeviceStatus {
   current_available_skills: AvailableSkillSummary[];
   background_processes: BackgroundProcessSummary[];
   pending_control_requests: PendingControlRequest[];
+  memory_directory: string | null;
 }
 
 export type LoopStatus =
@@ -395,10 +396,16 @@ export interface SearchFilesCommand {
   max_results?: number;
 }
 
-export interface ListFoldersInDirectoryCommand {
+export interface ListInDirectoryCommand {
-  type: "list_folders_in_directory";
+  type: "list_in_directory";
-  /** Absolute path to list folders in. */
+  /** Absolute path to list entries in. */
   path: string;
+  /** When true, response includes non-directory entries in `files`. */
+  include_files?: boolean;
+  /** Max entries to return (folders + files combined). */
+  limit?: number;
+  /** Number of entries to skip before returning. */
+  offset?: number;
 }
 
 export interface ReadFileCommand {
@@ -409,6 +416,22 @@ export interface ReadFileCommand {
   request_id: string;
 }
 
+export interface ListMemoryCommand {
+  type: "list_memory";
+  /** Echoed back in every response chunk for request correlation. */
+  request_id: string;
+  /** The agent whose memory to list. */
+  agent_id: string;
+}
+
+export interface EnableMemfsCommand {
+  type: "enable_memfs";
+  /** Echoed back in the response for request correlation. */
+  request_id: string;
+  /** The agent to enable memfs for. */
+  agent_id: string;
+}
+
 export type WsProtocolCommand =
   | InputCommand
   | ChangeDeviceStateCommand
@@ -419,8 +442,10 @@ export type WsProtocolCommand =
   | TerminalResizeCommand
   | TerminalKillCommand
   | SearchFilesCommand
-  | ListFoldersInDirectoryCommand
+  | ListInDirectoryCommand
-  | ReadFileCommand;
+  | ReadFileCommand
+  | ListMemoryCommand
+  | EnableMemfsCommand;
 
 export type WsProtocolMessage =
   | DeviceStatusUpdateMessage

src/websocket/listener/client.ts

@@ -62,7 +62,9 @@ import {
   persistPermissionModeMapForRuntime,
 } from "./permissionMode";
 import {
-  isListFoldersCommand,
+  isEnableMemfsCommand,
+  isListInDirectoryCommand,
+  isListMemoryCommand,
   isReadFileCommand,
   isSearchFilesCommand,
   parseServerMessage,
@@ -1019,35 +1021,66 @@ async function connectWithRetry(
       return;
     }
 
-    // ── Folder listing (no runtime scope required) ────────────────────
+    // ── Directory listing (no runtime scope required) ──────────────────
-    if (isListFoldersCommand(parsed)) {
+    if (isListInDirectoryCommand(parsed)) {
       void (async () => {
         try {
           const { readdir } = await import("node:fs/promises");
           const entries = await readdir(parsed.path, { withFileTypes: true });
-          const folders = entries
+
-            .filter((e) => e.isDirectory())
+          // Filter out OS/VCS noise before sorting
-            .map((e) => e.name)
+          const IGNORED_NAMES = new Set([
-            .sort();
+            ".DS_Store",
-          socket.send(
+            ".git",
-            JSON.stringify({
+            ".gitignore",
-              type: "list_folders_in_directory_response",
+            "Thumbs.db",
-              path: parsed.path,
+          ]);
-              folders,
+          const sortedEntries = entries
-              hasMore: false,
+            .filter((e) => !IGNORED_NAMES.has(e.name))
-              success: true,
+            .sort((a, b) => a.name.localeCompare(b.name));
-            }),
+
-          );
+          const allFolders: string[] = [];
+          const allFiles: string[] = [];
+          for (const e of sortedEntries) {
+            if (e.isDirectory()) {
+              allFolders.push(e.name);
+            } else if (parsed.include_files) {
+              allFiles.push(e.name);
+            }
+          }
+
+          const total = allFolders.length + allFiles.length;
+          const offset = parsed.offset ?? 0;
+          const limit = parsed.limit ?? total;
+
+          // Paginate over the combined [folders, files] list
+          const combined = [...allFolders, ...allFiles];
+          const page = combined.slice(offset, offset + limit);
+          const folders = page.filter((name) => allFolders.includes(name));
+          const files = page.filter((name) => allFiles.includes(name));
+
+          const response: Record<string, unknown> = {
+            type: "list_in_directory_response",
+            path: parsed.path,
+            folders,
+            hasMore: offset + limit < total,
+            total,
+            success: true,
+          };
+          if (parsed.include_files) {
+            response.files = files;
+          }
+          socket.send(JSON.stringify(response));
         } catch (err) {
           socket.send(
             JSON.stringify({
-              type: "list_folders_in_directory_response",
+              type: "list_in_directory_response",
               path: parsed.path,
               folders: [],
               hasMore: false,
               success: false,
               error:
-                err instanceof Error ? err.message : "Failed to list folders",
+                err instanceof Error ? err.message : "Failed to list directory",
             }),
           );
         }
@@ -1086,6 +1119,152 @@ async function connectWithRetry(
       return;
     }
 
+    // ── Memory index (no runtime scope required) ─────────────────────
+    if (isListMemoryCommand(parsed)) {
+      void (async () => {
+        try {
+          const { getMemoryFilesystemRoot } = await import(
+            "../../agent/memoryFilesystem"
+          );
+          const { scanMemoryFilesystem, getFileNodes, readFileContent } =
+            await import("../../agent/memoryScanner");
+          const { parseFrontmatter } = await import("../../utils/frontmatter");
+
+          const { existsSync } = await import("node:fs");
+          const { join } = await import("node:path");
+
+          const memoryRoot = getMemoryFilesystemRoot(parsed.agent_id);
+
+          // If the memory directory doesn't have a git repo, memfs
+          // hasn't been initialized — tell the UI so it can show the
+          // enable button instead of an empty file list.
+          const memfsInitialized = existsSync(join(memoryRoot, ".git"));
+
+          if (!memfsInitialized) {
+            socket.send(
+              JSON.stringify({
+                type: "list_memory_response",
+                request_id: parsed.request_id,
+                entries: [],
+                done: true,
+                total: 0,
+                success: true,
+                memfs_initialized: false,
+              }),
+            );
+            return;
+          }
+
+          const treeNodes = scanMemoryFilesystem(memoryRoot);
+          const fileNodes = getFileNodes(treeNodes).filter((n) =>
+            n.name.endsWith(".md"),
+          );
+
+          const CHUNK_SIZE = 5;
+          const total = fileNodes.length;
+
+          for (let i = 0; i < total; i += CHUNK_SIZE) {
+            const chunk = fileNodes.slice(i, i + CHUNK_SIZE);
+            const entries = chunk.map((node) => {
+              const raw = readFileContent(node.fullPath);
+              const { frontmatter, body } = parseFrontmatter(raw);
+              const desc = frontmatter.description;
+              return {
+                relative_path: node.relativePath,
+                is_system:
+                  node.relativePath.startsWith("system/") ||
+                  node.relativePath.startsWith("system\\"),
+                description: typeof desc === "string" ? desc : null,
+                content: body,
+                size: body.length,
+              };
+            });
+
+            const done = i + CHUNK_SIZE >= total;
+            socket.send(
+              JSON.stringify({
+                type: "list_memory_response",
+                request_id: parsed.request_id,
+                entries,
+                done,
+                total,
+                success: true,
+                memfs_initialized: true,
+              }),
+            );
+          }
+
+          // Edge case: no files at all (repo exists but empty)
+          if (total === 0) {
+            socket.send(
+              JSON.stringify({
+                type: "list_memory_response",
+                request_id: parsed.request_id,
+                entries: [],
+                done: true,
+                total: 0,
+                success: true,
+                memfs_initialized: true,
+              }),
+            );
+          }
+        } catch (err) {
+          socket.send(
+            JSON.stringify({
+              type: "list_memory_response",
+              request_id: parsed.request_id,
+              entries: [],
+              done: true,
+              total: 0,
+              success: false,
+              error:
+                err instanceof Error ? err.message : "Failed to list memory",
+            }),
+          );
+        }
+      })();
+      return;
+    }
+
+    // ── Enable memfs command ────────────────────────────────────────────
+    if (isEnableMemfsCommand(parsed)) {
+      void (async () => {
+        try {
+          const { applyMemfsFlags } = await import(
+            "../../agent/memoryFilesystem"
+          );
+          const result = await applyMemfsFlags(parsed.agent_id, true, false);
+          socket.send(
+            JSON.stringify({
+              type: "enable_memfs_response",
+              request_id: parsed.request_id,
+              success: true,
+              memory_directory: result.memoryDir,
+            }),
+          );
+          // Push memory_updated so the UI auto-refreshes its file list
+          socket.send(
+            JSON.stringify({
+              type: "memory_updated",
+              affected_paths: ["*"],
+              timestamp: Date.now(),
+            }),
+          );
+        } catch (err) {
+          socket.send(
+            JSON.stringify({
+              type: "enable_memfs_response",
+              request_id: parsed.request_id,
+              success: false,
+              error:
+                err instanceof Error ? err.message : "Failed to enable memfs",
+            }),
+          );
+        }
+      })();
+      return;
+    }
+
     // ── Terminal commands (no runtime scope required) ──────────────────
     if (parsed.type === "terminal_spawn") {
       handleTerminalSpawn(

src/websocket/listener/protocol-inbound.ts

@@ -2,8 +2,10 @@ import type WebSocket from "ws";
 import type {
   AbortMessageCommand,
   ChangeDeviceStateCommand,
+  EnableMemfsCommand,
   InputCommand,
-  ListFoldersInDirectoryCommand,
+  ListInDirectoryCommand,
+  ListMemoryCommand,
   ReadFileCommand,
   RuntimeScope,
   SearchFilesCommand,
@@ -255,12 +257,12 @@ export function isSearchFilesCommand(
   );
 }
 
-export function isListFoldersCommand(
+export function isListInDirectoryCommand(
   value: unknown,
-): value is ListFoldersInDirectoryCommand {
+): value is ListInDirectoryCommand {
   if (!value || typeof value !== "object") return false;
   const c = value as { type?: unknown; path?: unknown };
-  return c.type === "list_folders_in_directory" && typeof c.path === "string";
+  return c.type === "list_in_directory" && typeof c.path === "string";
 }
 
 export function isReadFileCommand(value: unknown): value is ReadFileCommand {
@@ -273,6 +275,38 @@ export function isReadFileCommand(value: unknown): value is ReadFileCommand {
   );
 }
 
+export function isListMemoryCommand(
+  value: unknown,
+): value is ListMemoryCommand {
+  if (!value || typeof value !== "object") return false;
+  const c = value as {
+    type?: unknown;
+    request_id?: unknown;
+    agent_id?: unknown;
+  };
+  return (
+    c.type === "list_memory" &&
+    typeof c.request_id === "string" &&
+    typeof c.agent_id === "string"
+  );
+}
+
+export function isEnableMemfsCommand(
+  value: unknown,
+): value is EnableMemfsCommand {
+  if (!value || typeof value !== "object") return false;
+  const c = value as {
+    type?: unknown;
+    request_id?: unknown;
+    agent_id?: unknown;
+  };
+  return (
+    c.type === "enable_memfs" &&
+    typeof c.request_id === "string" &&
+    typeof c.agent_id === "string"
+  );
+}
+
 export function parseServerMessage(
   data: WebSocket.RawData,
 ): ParsedServerMessage | null {
@@ -289,8 +323,10 @@ export function parseServerMessage(
       isTerminalResizeCommand(parsed) ||
       isTerminalKillCommand(parsed) ||
       isSearchFilesCommand(parsed) ||
-      isListFoldersCommand(parsed) ||
+      isListInDirectoryCommand(parsed) ||
-      isReadFileCommand(parsed)
+      isReadFileCommand(parsed) ||
+      isListMemoryCommand(parsed) ||
+      isEnableMemfsCommand(parsed)
     ) {
       return parsed as WsProtocolCommand;
     }

src/websocket/listener/protocol-outbound.ts

@@ -1,5 +1,6 @@
 import type { MessageCreate } from "@letta-ai/letta-client/resources/agents/agents";
 import WebSocket from "ws";
+import { getMemoryFilesystemRoot } from "../../agent/memoryFilesystem";
 import { permissionMode } from "../../permissions/mode";
 import type { DequeuedBatch } from "../../queue/queueRuntime";
 import { settingsManager } from "../../settings-manager";
@@ -101,6 +102,7 @@ export function buildDeviceStatus(
       current_available_skills: [],
       background_processes: [],
       pending_control_requests: [],
+      memory_directory: null,
     };
   }
   const scope = getScopeForRuntime(runtime, params);
@@ -145,6 +147,9 @@ export function buildDeviceStatus(
     current_available_skills: [],
     background_processes: [],
     pending_control_requests: getPendingControlRequests(listener, scope),
+    memory_directory: scopedAgentId
+      ? getMemoryFilesystemRoot(scopedAgentId)
+      : null,
   };
 }