M CHANGELOG.md → CHANGELOG.md

@@ -2,6 +2,12 @@ # Changelog
 
 All notable user-facing changes to `pi-chrome`.
 
+## 0.15.31 — 2026-05-31
+
+Per-session tab groups.
+
+- **Each Pi session gets its own tab group.** Auto-grouped tabs are now named `Pi Session <name>` using the session's display name, falling back to the session id when unnamed. Multiple Pi sessions driving the same Chrome no longer share one group — each collects its tabs separately. Pass an explicit `groupTitle` to override, or `group:false` / `groupTitle:""` on `action=new` to opt out.
+
 ## 0.15.30 — 2026-05-31
 
 Tab grouping for `chrome_tab`.

M extensions/chrome-profile-bridge/browser-extension/manifest.json → extensions/chrome-profile-bridge/browser-extension/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "Pi Chrome Connector",
-  "version": "0.15.30",
+  "version": "0.15.31",
   "description": "Lets Pi control tabs in Chrome via a local connector at 127.0.0.1.",
   "permissions": [
     "tabs",

M extensions/chrome-profile-bridge/index.ts → extensions/chrome-profile-bridge/index.ts

@@ -599,6 +599,14 @@ throw new Error("Chrome control locked. Ask the user to run /chrome authorize before using chrome_* tools.");
 		}
 	};
 
+	// Tab-group title for this Pi session: prefer the user-set display name, else the session id.
+	const sessionGroupTitle = (ctx: ExtensionContext): string => {
+		const sm = ctx.sessionManager;
+		const name = sm.getSessionName?.();
+		const id = sm.getSessionId?.();
+		return `Pi Session ${name || id || "unknown"}`;
+	};
+
 	const updateChromeStatus = (ctx: ExtensionContext): void => {
 		if (chromeControlAuthorized()) {
 			ctx.ui.setStatus("chrome", ctx.ui.theme.fg("success", "●") + " Chrome Bridge");
@@ -1037,14 +1045,21 @@ url: Type.Optional(Type.String({ description: "URL for action=new." })),
 			targetId: Type.Optional(Type.String({ description: "Chrome tab id for activate/close/group/ungroup." })),
 			urlIncludes: Type.Optional(Type.String({ description: "Match the target tab by URL substring for activate/close/group/ungroup." })),
 			titleIncludes: Type.Optional(Type.String({ description: "Match the target tab by title substring for activate/close/group/ungroup." })),
-			group: Type.Optional(Type.Boolean({ description: "action=new only: pass false to open an ungrouped tab. By default every Pi-opened tab joins the window's 'Pi' tab group." })),
-			groupTitle: Type.Optional(Type.String({ description: "Tab group title for action=group (or action=new to open into a named group). Defaults to 'Pi'. Pass an empty string on action=new to opt out of grouping." })),
+			group: Type.Optional(Type.Boolean({ description: "action=new only: pass false to open an ungrouped tab. By default every Pi-opened tab joins this session's own tab group." })),
+			groupTitle: Type.Optional(Type.String({ description: "Tab group title for action=group/new. Defaults to this Pi session's group ('Pi Session <name-or-id>'). Pass an empty string on action=new to opt out of grouping." })),
 			groupColor: Type.Optional(Type.String({ description: "Tab group color for action=group/new: grey, blue, red, yellow, green, pink, purple, cyan, or orange. Defaults to blue." })),
 			host: Type.Optional(Type.String()),
 			port: Type.Optional(Type.Number()),
 		}),
-		async execute(_id, params, signal): Promise<ToolTextResult> {
-			const result = await authorizedBridgeSend(`tab.${params.action}`, params, DEFAULT_TIMEOUT_MS, signal);
+		async execute(_id, params, signal, _onUpdate, ctx): Promise<ToolTextResult> {
+			const forwarded = { ...params } as typeof params & { groupTitle?: string };
+			// Default every Pi-opened/explicitly-grouped tab into this session's own group,
+			// named after the session display name (falling back to the session id), unless
+			// the caller specified a group title or opted out with group:false.
+			if ((params.action === "new" || params.action === "group") && params.groupTitle === undefined && params.group !== false) {
+				forwarded.groupTitle = sessionGroupTitle(ctx);
+			}
+			const result = await authorizedBridgeSend(`tab.${params.action}`, forwarded, DEFAULT_TIMEOUT_MS, signal);
 			if (params.action === "list") {
 				const tabs = result as Array<{ id: number; title: string; url: string; active: boolean; windowId: number; group?: { title?: string } | null }>;
 				const text = tabs.map((tab) => `${tab.id}\t${tab.active ? "*" : " "}\t${tab.group?.title ? `[${tab.group.title}] ` : ""}${tab.title || "(untitled)"}\t${tab.url}`).join("\n") || "No tabs.";

M package.json → package.json

@@ -1,6 +1,6 @@
 {
 	"name": "pi-chrome",
-	"version": "0.15.30",
+	"version": "0.15.31",
 	"scripts": {
 		"test": "node test-suite/unit/csp-eval.test.mjs",
 		"version": "node scripts/sync-manifest-version.js",