fix: reset loaded_skills block on new conversation (#837)

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

src/agent/loadedSkills.ts

@@ -0,0 +1,52 @@
+import { getClient } from "./client";
+import { setHasLoadedSkills } from "./context";
+import { parseMdxFrontmatter } from "./memory";
+import { MEMORY_PROMPTS } from "./promptAssets";
+
+const DEFAULT_LOADED_SKILLS_VALUE = (() => {
+  const content = MEMORY_PROMPTS["loaded_skills.mdx"];
+  if (!content) {
+    return "No skills currently loaded.";
+  }
+  return parseMdxFrontmatter(content).body;
+})();
+
+type Client = Awaited<ReturnType<typeof getClient>>;
+
+export async function clearLoadedSkillsForConversation(
+  conversationId: string,
+  clientOverride?: Client,
+): Promise<void> {
+  if (!conversationId || conversationId === "default") {
+    return;
+  }
+
+  try {
+    const client = clientOverride ?? (await getClient());
+    const conversation = await client.conversations.retrieve(conversationId);
+    const isolatedBlockIds = conversation.isolated_block_ids || [];
+
+    for (const blockId of isolatedBlockIds) {
+      try {
+        const block = await client.blocks.retrieve(blockId);
+        if (block.label !== "loaded_skills") {
+          continue;
+        }
+
+        const value = typeof block.value === "string" ? block.value.trim() : "";
+        if (value !== DEFAULT_LOADED_SKILLS_VALUE) {
+          await client.blocks.update(blockId, {
+            value: DEFAULT_LOADED_SKILLS_VALUE,
+          });
+        }
+
+        setHasLoadedSkills(false);
+        return;
+      } catch {
+        // Ignore block errors; continue searching.
+      }
+    }
+  } catch {
+    // Best-effort cleanup; ignore errors.
+  }
+}

src/cli/App.tsx

@@ -40,6 +40,7 @@ import { getClient } from "../agent/client";
 import { getCurrentAgentId, setCurrentAgentId } from "../agent/context";
 import { type AgentProvenance, createAgent } from "../agent/create";
 import { getLettaCodeHeaders } from "../agent/http-headers";
+import { clearLoadedSkillsForConversation } from "../agent/loadedSkills";
 import { ISOLATED_BLOCK_LABELS } from "../agent/memory";
 import {
   checkMemoryFilesystemStatus,
@@ -6061,6 +6062,7 @@ export default function App({
 
             // Update conversationId state
             setConversationId(conversation.id);
+            clearLoadedSkillsForConversation(conversation.id, client);
 
             // Save the new session to settings
             settingsManager.setLocalLastSession(
@@ -11068,6 +11070,7 @@ Plan file path: ${planFilePath}`;
                       isolated_block_labels: [...ISOLATED_BLOCK_LABELS],
                     });
                     setConversationId(conversation.id);
+                    clearLoadedSkillsForConversation(conversation.id, client);
                     settingsManager.setLocalLastSession(
                       { agentId, conversationId: conversation.id },
                       process.cwd(),

src/index.ts

@@ -12,6 +12,7 @@ import {
 } from "./agent/context";
 import type { AgentProvenance } from "./agent/create";
 import { getLettaCodeHeaders } from "./agent/http-headers";
+import { clearLoadedSkillsForConversation } from "./agent/loadedSkills";
 import { ensureSkillsBlocks, ISOLATED_BLOCK_LABELS } from "./agent/memory";
 import { LETTA_CLOUD_API_URL } from "./auth/oauth";
 import { ConversationSelector } from "./cli/components/ConversationSelector";
@@ -1855,6 +1856,7 @@ async function main(): Promise<void> {
             isolated_block_labels: [...ISOLATED_BLOCK_LABELS],
           });
           conversationIdToUse = conversation.id;
+          clearLoadedSkillsForConversation(conversation.id, client);
         } else {
           // Default (including --new-agent): use the agent's "default" conversation
           conversationIdToUse = "default";