a plugin can ask for its own chats back

a plugin's chats run in $DATA_PATH/<email>/plugins/<appName>/chats, built
server-side and deliberately never sent to the browser. which left the plugin
able to START conversations in its own directory and with no way to LIST them —
the path is the one thing it cannot name.

so /chat/sessions takes ?context=plugin&contextId=<appName> and resolves it the
same way the turn does. the four call sites already shared cwdOf; it takes the
identity now rather than just the home.

the plain ?cwd= form stays for /chat, where the user picks a directory and
knows what they picked. it is not a hole either way: listClaudeSessions reads
that identity's own ~/.claude/projects, so naming another directory shows you
your own conversations elsewhere, never anybody else's.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Officer-Session: 656f5c85-e49a-4f1f-b9f3-042a04b4d043

src/servers/api/chat/chat.ts

@@ -1,3 +1,4 @@
+import { getPluginChatsDir } from '@@/data-path';
 import type { Context } from 'hono';
 import { emitToSession, sessionKeyForTranscript } from './websocket';
 import { pauseBackgroundTask, restartBackgroundTask } from './task-restart';
@@ -108,7 +109,24 @@ export const chatRouter = createRouter();
 // caller's own home. Claude groups sessions by cwd, so this selects which project group we read.
 // OpenCode runs on one fixed serve, but each session records the directory its turn ran in, so cwd
 // selects there too.
-const cwdOf = (ctx: Context, home: string): string => ctx.req.query('cwd')?.trim() || home;
+/**
+ * Which directory a listing is about.
+ *
+ * `?context=plugin&contextId=<appName>` resolves server-side, and it exists because the client CANNOT
+ * name this one: a plugin's chats run in `$DATA_PATH/<email>/plugins/<appName>/chats`, built by
+ * `resolveChatCwd` and deliberately never sent to the browser. Without this, a plugin can start chats in
+ * its own directory and then has no way to ask for them back.
+ *
+ * The plain `?cwd=` form stays for `/chat`, where the user picks a directory and knows what they picked.
+ * It is not a hole — `listClaudeSessions` reads that identity's own `~/.claude/projects`, so naming
+ * another directory shows you your own conversations elsewhere, never anybody else's.
+ */
+const cwdOf = (ctx: Context, who: { home: string; email: string }): string => {
+  const context = ctx.req.query('context');
+  const contextId = ctx.req.query('contextId')?.trim();
+  if (context === 'plugin' && contextId) return getPluginChatsDir(who.email, contextId);
+  return ctx.req.query('cwd')?.trim() || who.home;
+};
 
 // GET /chat/pwds — the default /chat dir plus every directory that already has Claude sessions.
 chatRouter.get('/pwds', async (ctx) => {
@@ -121,7 +139,7 @@ chatRouter.get('/pwds', async (ctx) => {
 chatRouter.get('/sessions', async (ctx) => {
   const user = ctx.get('user');
   const who = await chatIdentity(user);
-  const cwd = cwdOf(ctx, who.home);
+  const cwd = cwdOf(ctx, who);
 
   // `?all=1` — every directory at once, for the list's Latest tab. A separate parameter rather than a
   // separate route because the response shape is identical and every consumer downstream (rename, delete,
@@ -205,7 +223,7 @@ chatRouter.get('/sessions/:id', async (ctx) => {
   const user = ctx.get('user');
   const who = await chatIdentity(user);
   const id = ctx.req.param('id');
-  const cwd = cwdOf(ctx, who.home);
+  const cwd = cwdOf(ctx, who);
   // Fall back to a by-id scan when the (default) cwd doesn't hold it — a fresh /chat/<id> deep-link/refresh
   // doesn't know the session's cwd. The returned detail carries the real cwd for the client to scope the UI.
   // 404 rather than 403 on the OpenCode branch: a non-owner has no way to tell a session they may not read
@@ -418,7 +436,7 @@ chatRouter.get('/live', async (ctx) => {
 chatRouter.delete('/sessions/:id', async (ctx) => {
   const who = await chatIdentity(ctx.get('user'));
   const id = ctx.req.param('id');
-  const cwd = cwdOf(ctx, who.home);
+  const cwd = cwdOf(ctx, who);
   if (isOpenCodeSessionId(id) && !who.isOwner) return ctx.text('Not found', 404);
   if (isOpenCodeSessionId(id)) {
     if (!(await deleteOpenCodeSession(id))) return ctx.text('Not found', 404);
@@ -457,7 +475,7 @@ chatRouter.delete('/sessions/:id', async (ctx) => {
 chatRouter.patch('/sessions/:id/title', async (ctx) => {
   const who = await chatIdentity(ctx.get('user'));
   const id = ctx.req.param('id');
-  const cwd = cwdOf(ctx, who.home);
+  const cwd = cwdOf(ctx, who);
   const { title } = await ctx.req.json<{ title?: string }>();
   if (!title?.trim()) return ctx.text('title is required', 400);
   if (isOpenCodeSessionId(id) && !who.isOwner) return ctx.text('Not found', 404);