Remember selected sessions and add rename

src/OpenCodeViewProvider.ts

@@ -17,6 +17,7 @@ import {
 } from "./transport/SseClient";
 
 const LAST_AGENT_KEY = "opencode.lastUsedAgent";
+const LAST_SESSION_KEY_PREFIX = "opencode.lastSession";
 
 interface DevServerConfig {
   origin: string;
@@ -141,6 +142,9 @@ export class OpenCodeViewProvider implements vscode.WebviewViewProvider {
       case "agent-changed":
         await this._handleAgentChanged(message.agent);
         break;
+      case "session-changed":
+        await this._handleSessionChanged(message.sessionId ?? null);
+        break;
       case "open-file":
         await this._handleOpenFile(
           message.url,
@@ -154,6 +158,13 @@ export class OpenCodeViewProvider implements vscode.WebviewViewProvider {
     }
   }
 
+  private _lastSessionKey(): string {
+    const workspaceRoot = this._openCodeService.getWorkspaceRoot();
+    return workspaceRoot
+      ? `${LAST_SESSION_KEY_PREFIX}:${workspaceRoot}`
+      : LAST_SESSION_KEY_PREFIX;
+  }
+
   private async _handleOpenFile(
     url: string,
     startLine?: number,
@@ -243,7 +254,9 @@ export class OpenCodeViewProvider implements vscode.WebviewViewProvider {
   private async _handleReady() {
     try {
       const currentSessionId =
-        this._openCodeService.getCurrentSessionId() ?? undefined;
+        this._globalState.get<string>(this._lastSessionKey()) ??
+        this._openCodeService.getCurrentSessionId() ??
+        undefined;
       const currentSessionTitle =
         this._openCodeService.getCurrentSessionTitle();
 
@@ -302,6 +315,12 @@ export class OpenCodeViewProvider implements vscode.WebviewViewProvider {
     logger.info("[ViewProvider] Agent selection persisted:", agent);
   }
 
+  private async _handleSessionChanged(sessionId: string | null) {
+    await this._globalState.update(this._lastSessionKey(), sessionId ?? undefined);
+    const logger = getLogger();
+    logger.info("[ViewProvider] Session selection persisted", { sessionId });
+  }
+
   // SSE Proxy handlers using resilient SseClient
   private _handleSSESubscribe(message: { id: string; url: string }) {
     const { id, url } = message;

src/shared/messages.test.ts

@@ -167,6 +167,16 @@ describe("WebviewMessageSchema", () => {
     expect(WebviewMessageSchema.parse(msg)).toEqual(msg);
   });
 
+  it("parses session-changed message", () => {
+    const msg = { type: "session-changed", sessionId: "ses_123" };
+    expect(WebviewMessageSchema.parse(msg)).toEqual(msg);
+  });
+
+  it("parses cleared session-changed message", () => {
+    const msg = { type: "session-changed", sessionId: null };
+    expect(WebviewMessageSchema.parse(msg)).toEqual(msg);
+  });
+
   it("parses search-files message", () => {
     const msg = { type: "search-files", query: "index" };
     expect(WebviewMessageSchema.parse(msg)).toEqual(msg);

src/shared/messages.ts

@@ -210,6 +210,10 @@ export const WebviewMessageSchema = z.discriminatedUnion("type", [
     type: z.literal("agent-changed"),
     agent: z.string(),
   }),
+  z.object({
+    type: z.literal("session-changed"),
+    sessionId: z.string().nullish(),
+  }),
   z.object({
     type: z.literal("open-file"),
     url: z.string(),

src/webview/App.css

@@ -1173,6 +1173,62 @@ body.vscode-high-contrast {
   border-left: 2px solid transparent;
 }
 
+.session-rename-form {
+  flex: 1;
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  gap: var(--spacing-xs);
+}
+
+.session-rename-input {
+  flex: 1;
+  min-width: 0;
+  padding: var(--padding-button-compact);
+  border: 1px solid var(--focus-border);
+  border-radius: 4px;
+  background-color: var(--input-background);
+  color: var(--input-foreground);
+  font-family: var(--font-family);
+  font-size: var(--font-size-small);
+  font-weight: 500;
+  box-sizing: border-box;
+}
+
+.session-rename-input:focus {
+  outline: 1px solid var(--focus-border);
+  outline-offset: 0;
+}
+
+.session-rename-action {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 26px;
+  height: 26px;
+  border: 1px solid transparent;
+  border-radius: 4px;
+  background-color: transparent;
+  color: var(--input-foreground);
+  cursor: pointer;
+  opacity: 0.7;
+}
+
+.session-rename-action:hover:not(:disabled) {
+  background-color: var(--hover-background);
+  opacity: 1;
+}
+
+.session-rename-action:disabled {
+  cursor: not-allowed;
+  opacity: 0.35;
+}
+
+.session-rename-action:focus-visible {
+  outline: 1px solid var(--focus-border);
+  outline-offset: 0;
+}
+
 .dropdown-arrow {
   font-size: 10px;
   opacity: 0.7;
@@ -1292,11 +1348,16 @@ body.vscode-high-contrast {
   opacity: 0.7;
 }
 
-.new-session-button:hover {
+.new-session-button:hover:not(:disabled) {
   background-color: var(--hover-background);
   opacity: 1;
 }
 
+.new-session-button:disabled {
+  cursor: not-allowed;
+  opacity: 0.35;
+}
+
 .new-session-button:focus-visible {
   outline: 1px solid var(--focus-border);
   outline-offset: 0;