Fix automatic session title generation

src/server/sessions/sessionNameGenerator.ts

@@ -4,6 +4,7 @@ import type { ModelRegistry } from "@earendil-works/pi-coding-agent";
 const SESSION_NAME_TIMEOUT_MS = 10_000;
 const SESSION_NAME_MAX_INPUT_CHARS = 4_000;
 const SESSION_NAME_MAX_LENGTH = 60;
+const FALLBACK_SESSION_NAME_MAX_WORDS = 6;
 
 export async function generateShortSessionName<TApi extends Api>(modelRegistry: ModelRegistry, model: Model<TApi>, firstMessage: string): Promise<string | undefined> {
   const provider = getApiProvider(model.api);
@@ -23,7 +24,6 @@ export async function generateShortSessionName<TApi extends Api>(modelRegistry:
       }],
     },
     {
-      temperature: 0.2,
       maxTokens: 24,
       reasoning: "minimal",
       signal: AbortSignal.timeout(SESSION_NAME_TIMEOUT_MS),
@@ -43,10 +43,21 @@ export async function generateShortSessionName<TApi extends Api>(modelRegistry:
   return cleanSessionName(finalMessage === undefined ? streamedText : textFromAssistant(finalMessage));
 }
 
+export function fallbackSessionName(firstMessage: string): string | undefined {
+  return cleanSessionName(firstMessage
+    .replace(/<skill name="[^"]+" location="[^"]+">[\s\S]*?<\/skill>/g, "")
+    .replace(/```[\s\S]*?```/g, " ")
+    .replace(/[`*_#[\](){}<>]/g, " ")
+    .split(/\s+/)
+    .filter(Boolean)
+    .slice(0, FALLBACK_SESSION_NAME_MAX_WORDS)
+    .join(" "));
+}
+
 export function cleanSessionName(value: string): string | undefined {
   const title = (value.split("\n", 1)[0] ?? "")
+    .replace(/^\s*(title|session title)\s*:\s*/i, "")
     .replace(/^\s*["'`]+|["'`.]+\s*$/g, "")
-    .replace(/^(title|session title)\s*:\s*/i, "")
     .replace(/\s+/g, " ")
     .trim()
     .slice(0, SESSION_NAME_MAX_LENGTH)