feat: re-advertise commands on every prompt to ensure autocomplete functionality

debug: add logging for ACP messages to stderr when CODEEP_ACP_DEBUG is enabled

Author: VladoIvankovic

src/acp/server.ts

@@ -760,6 +760,19 @@ export function startAcpServer(): Promise<void> {
       return;
     }
 
+    // Re-advertise commands on every prompt — Zed sometimes drops the initial
+    // `available_commands_update` from session/new because the thread_view
+    // isn't registered yet on Zed's side (race against the session/new
+    // response). Re-sending here guarantees `/` autocomplete works by the
+    // time the user could plausibly type the next prompt.
+    transport.notify('session/update', {
+      sessionId: params.sessionId,
+      update: {
+        sessionUpdate: 'available_commands_update',
+        availableCommands: AVAILABLE_COMMANDS,
+      },
+    });
+
     // Extract text from ContentBlock[]
     let prompt = params.prompt
       .filter((b) => b.type === 'text')

src/acp/transport.ts

@@ -34,6 +34,9 @@ export class StdioTransport {
       const trimmed = line.trim();
       if (!trimmed) continue;
       try {
+        if (process.env.CODEEP_ACP_DEBUG) {
+          process.stderr.write(`[ACP←client] ${trimmed}\n`);
+        }
         const msg = JSON.parse(trimmed) as JsonRpcRequest | JsonRpcResponse | JsonRpcNotification;
         // Check if this is a response to one of our outbound requests
         if ('result' in msg || 'error' in msg) {
@@ -53,7 +56,11 @@ export class StdioTransport {
   }
 
   send(msg: JsonRpcResponse | JsonRpcNotification): void {
-    process.stdout.write(JSON.stringify(msg) + '\n');
+    const line = JSON.stringify(msg);
+    if (process.env.CODEEP_ACP_DEBUG) {
+      process.stderr.write(`[ACP→client] ${line}\n`);
+    }
+    process.stdout.write(line + '\n');
   }
 
   respond(id: number | string, result: unknown): void {