v2.2-paseo-providers: Paseo provider stack + v2.2.1 pane-scoped chat fixes

Ship Paseo-equivalent provider snapshot, AgentComposerBar, ACP dispatch
rewrite with streaming/persist, permission prompts, and agent commands.
Follow-up: pane-scoped chat resolution, CoderMessageList tool timeline,
WS user-delta replace, and inference orphan tool_call stripping.
Archive openspec v2-2; update CHANGELOG and CURRENT.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/server/src/routes/coder-proxy.ts

@@ -0,0 +1,91 @@
+import type { FastifyInstance } from 'fastify';
+import WebSocket from 'ws';
+
+function boocoderWsUrl(origin: string, path: string): string {
+  const u = new URL(origin);
+  u.protocol = u.protocol === 'https:' ? 'wss:' : 'ws:';
+  u.pathname = path;
+  u.search = '';
+  return u.toString();
+}
+
+/**
+ * Reverse-proxy BooCoder HTTP + WebSocket through BooChat's single origin.
+ * WS must be registered before the HTTP catch-all — fetch() cannot upgrade.
+ */
+export function registerCoderProxy(app: FastifyInstance, boocoderOrigin: string): void {
+  app.get<{ Params: { sessionId: string } }>(
+    '/api/coder/ws/sessions/:sessionId',
+    { websocket: true },
+    (clientSocket, req) => {
+      const sessionId = req.params.sessionId;
+      const target = boocoderWsUrl(boocoderOrigin, `/api/ws/sessions/${sessionId}`);
+      const upstream = new WebSocket(target);
+
+      upstream.on('open', () => {
+        app.log.debug({ sessionId }, 'coder ws proxy: upstream connected');
+      });
+
+      upstream.on('message', (data, isBinary) => {
+        if (clientSocket.readyState !== clientSocket.OPEN) return;
+        clientSocket.send(data, { binary: isBinary });
+      });
+
+      upstream.on('close', (code, reason) => {
+        if (clientSocket.readyState === clientSocket.OPEN) {
+          clientSocket.close(code, reason.toString());
+        }
+      });
+
+      upstream.on('error', (err) => {
+        app.log.warn({ err, sessionId, target }, 'coder ws proxy: upstream error');
+        if (clientSocket.readyState === clientSocket.OPEN) {
+          clientSocket.close(1011, 'upstream error');
+        }
+      });
+
+      clientSocket.on('message', (data, isBinary) => {
+        if (upstream.readyState !== WebSocket.OPEN) return;
+        upstream.send(data, { binary: isBinary });
+      });
+
+      clientSocket.on('close', () => {
+        if (upstream.readyState === WebSocket.OPEN || upstream.readyState === WebSocket.CONNECTING) {
+          upstream.close();
+        }
+      });
+
+      clientSocket.on('error', () => {
+        if (upstream.readyState === WebSocket.OPEN || upstream.readyState === WebSocket.CONNECTING) {
+          upstream.close();
+        }
+      });
+    },
+  );
+
+  app.all('/api/coder/*', async (req, reply) => {
+    const targetPath = req.url.replace('/api/coder', '/api');
+    const targetUrl = `${boocoderOrigin}${targetPath}`;
+    const headers: Record<string, string> = {};
+    if (req.headers['content-type']) headers['content-type'] = req.headers['content-type'] as string;
+    if (req.headers['authorization']) headers['authorization'] = req.headers['authorization'] as string;
+
+    try {
+      const res = await fetch(targetUrl, {
+        method: req.method as string,
+        headers,
+        body: req.method !== 'GET' && req.method !== 'HEAD' ? JSON.stringify(req.body) : undefined,
+      });
+      reply.code(res.status);
+      for (const [key, value] of res.headers) {
+        if (key === 'transfer-encoding') continue;
+        reply.header(key, value);
+      }
+      const body = await res.text();
+      return reply.send(body);
+    } catch (err) {
+      app.log.error({ err, targetUrl }, 'coder proxy error');
+      reply.code(502).send({ error: 'boocoder backend unavailable' });
+    }
+  });
+}

apps/server/src/routes/sessions.ts

@@ -33,7 +33,8 @@ const WorkspacePaneZ = z.object({
   kind: z.enum([
     'chat',
     'terminal',
-    'agent',
+    'coder',
+    'agent', // legacy alias — normalized to coder on write
     'empty',
     'settings',
     'markdown_artifact',
@@ -307,9 +308,12 @@ export function registerSessionRoutes(
         reply.code(400);
         return { error: 'invalid body', details: parsed.error.flatten() };
       }
+      const workspacePanes = parsed.data.workspace_panes.map((pane) =>
+        pane.kind === 'agent' ? { ...pane, kind: 'coder' as const } : pane,
+      );
       const rows = await sql<Session[]>`
         UPDATE sessions
-        SET workspace_panes = ${sql.json(parsed.data.workspace_panes as never)},
+        SET workspace_panes = ${sql.json(workspacePanes as never)},
             updated_at = clock_timestamp()
         WHERE id = ${req.params.id}
         RETURNING id, project_id, name, model, system_prompt, status, created_at, updated_at,

apps/server/src/routes/skills.ts

@@ -1,9 +1,13 @@
-import { randomUUID } from 'node:crypto';
 import type { FastifyInstance } from 'fastify';
 import { z } from 'zod';
 import type { Sql } from '../db.js';
 import type { Chat } from '../types/api.js';
 import { getSkillBody, listSkills } from '../services/skills.js';
+import {
+  buildSkillInvokeSyntheticFrames,
+  DEFAULT_SKILL_USER_MESSAGE,
+  runSkillInvokeTransaction,
+} from '../services/skill-invoke.js';
 
 // Batch 9.6 slash-invoke handlers. Mirrors the MessageHandlers shape in
 // routes/messages.ts so index.ts can pass thin adapters around broker +
@@ -35,8 +39,6 @@ const SkillInvokeBody = z.object({
   user_message: z.string().max(64_000).nullable().optional(),
 });
 
-const DEFAULT_USER_MESSAGE = 'Apply this skill.';
-
 export function registerSkillsRoutes(
   app: FastifyInstance,
   sql: Sql,
@@ -62,7 +64,9 @@ export function registerSkillsRoutes(
         return { error: 'invalid body', details: parsed.error.flatten() };
       }
       const { skill_name } = parsed.data;
-      const userText = parsed.data.user_message?.trim() ? parsed.data.user_message : DEFAULT_USER_MESSAGE;
+      const userText = parsed.data.user_message?.trim()
+        ? parsed.data.user_message
+        : DEFAULT_SKILL_USER_MESSAGE;
 
       const chatRows = await sql<Chat[]>`
         SELECT id, session_id FROM chats WHERE id = ${req.params.id} AND status = 'open'
@@ -80,87 +84,20 @@ export function registerSkillsRoutes(
         return { error: 'unknown_skill', message: `unknown skill: ${skill_name}` };
       }
 
-      const toolCallId = randomUUID();
-      const toolCalls = [{ id: toolCallId, name: 'skill_use', args: { name: skill_name } }];
-      const toolResults = { tool_call_id: toolCallId, output: body, truncated: false };
-
-      const result = await sql.begin(async (tx) => {
-        const [synthAssistant] = await tx<{ id: string }[]>`
-          INSERT INTO messages (session_id, chat_id, role, content, status, created_at)
-          VALUES (${sessionId}, ${chat.id}, 'assistant', '', 'complete', clock_timestamp())
-          RETURNING id
-        `;
-        // v1.13.20: parts-only write. Single skill_use tool_call, no text
-        // content, so one part at seq 0.
-        await tx`
-          INSERT INTO message_parts (message_id, sequence, kind, payload)
-          VALUES (${synthAssistant!.id}, 0, 'tool_call', ${tx.json({
-            id: toolCallId,
-            name: 'skill_use',
-            args: { name: skill_name },
-          } as never)})
-        `;
-        const [toolMsg] = await tx<{ id: string }[]>`
-          INSERT INTO messages (session_id, chat_id, role, content, status, created_at)
-          VALUES (${sessionId}, ${chat.id}, 'tool', '', 'complete', clock_timestamp())
-          RETURNING id
-        `;
-        // v1.13.20: parts-only write of the synthetic tool result (skill body).
-        await tx`
-          INSERT INTO message_parts (message_id, sequence, kind, payload)
-          VALUES (${toolMsg!.id}, 0, 'tool_result', ${tx.json(toolResults as never)})
-        `;
-        const [userMsg] = await tx<{ id: string }[]>`
-          INSERT INTO messages (session_id, chat_id, role, content, status, created_at)
-          VALUES (${sessionId}, ${chat.id}, 'user', ${userText}, 'complete', clock_timestamp())
-          RETURNING id
-        `;
-        const [assistantMsg] = await tx<{ id: string }[]>`
-          INSERT INTO messages (session_id, chat_id, role, content, status, created_at)
-          VALUES (${sessionId}, ${chat.id}, 'assistant', '', 'streaming', clock_timestamp())
-          RETURNING id
-        `;
-        await tx`UPDATE sessions SET updated_at = clock_timestamp() WHERE id = ${sessionId}`;
-        await tx`UPDATE chats SET updated_at = clock_timestamp() WHERE id = ${chat.id}`;
-        return {
-          synth_assistant_id: synthAssistant!.id,
-          tool_message_id: toolMsg!.id,
-          user_message_id: userMsg!.id,
-          assistant_message_id: assistantMsg!.id,
-        };
+      const { result, toolCall } = await runSkillInvokeTransaction(sql, {
+        sessionId,
+        chatId: chat.id,
+        skillName: skill_name,
+        skillBody: body,
+        userText,
       });
 
       // Synthetic frames so useSessionStream's reducer reflects the new
       // history without a refetch. Frame shapes match the streaming-inference
       // protocol (see services/inference.ts InferenceFrame).
-      handlers.publishSessionFrame(sessionId, {
-        type: 'message_started',
-        message_id: result.synth_assistant_id,
-        chat_id: chat.id,
-        role: 'assistant',
-      });
-      handlers.publishSessionFrame(sessionId, {
-        type: 'tool_call',
-        message_id: result.synth_assistant_id,
-        chat_id: chat.id,
-        tool_call: toolCalls[0]!,
-      });
-      handlers.publishSessionFrame(sessionId, {
-        type: 'message_complete',
-        message_id: result.synth_assistant_id,
-        chat_id: chat.id,
-      });
-      // The tool_result frame's reducer branch creates the tool-role message
-      // in-place when it doesn't already exist — no separate message_started
-      // is needed for the tool side.
-      handlers.publishSessionFrame(sessionId, {
-        type: 'tool_result',
-        tool_message_id: result.tool_message_id,
-        tool_call_id: toolCallId,
-        chat_id: chat.id,
-        output: body,
-        truncated: false,
-      });
+      for (const frame of buildSkillInvokeSyntheticFrames(chat.id, result, toolCall, body)) {
+        handlers.publishSessionFrame(sessionId, frame);
+      }
       handlers.publishUserMessage(sessionId, chat.id, result.user_message_id, userText);
       handlers.enqueueInference(sessionId, chat.id, result.assistant_message_id, 'default');