fix(hub): resume Claude SDK sessions

hub/src/agent/models.ts

@@ -29,8 +29,8 @@ export interface RoleEntry {
   readonly defaultModel: string | undefined;
   /**
    * System prompt seeding the agent's persona/instructions. Prepended to the
-   * run's messages only at session start (resume reads it from the transcript,
-   * see runner.ts). `undefined` ⇒ no system prompt (bare run).
+   * run's messages only at session start; Claude SDK resume restores later
+   * turns from the provider session. `undefined` ⇒ no system prompt (bare run).
    */
   readonly systemPrompt?: string | undefined;
   /**

hub/src/agent/runner.ts

@@ -17,7 +17,7 @@
  * message streaming, and a battle-tested agent loop — capabilities we'd have
  * to build ourselves with a generic provider.
  */
-import { query, type SDKMessage, type SDKAssistantMessage, type SDKResultMessage, type SDKPartialAssistantMessage } from "@anthropic-ai/claude-agent-sdk";
+import { query, type McpServerConfig, type SDKMessage, type SDKAssistantMessage, type SDKResultMessage, type SDKPartialAssistantMessage } from "@anthropic-ai/claude-agent-sdk";
 import type { PrismaClient } from "@prisma/client";
 
 export interface ProjectContext {
@@ -39,6 +39,8 @@ export interface RunRequest {
   readonly model: string | undefined;
   readonly project: ProjectContext;
   readonly systemPrompt: string | undefined;
+  readonly resumeSessionId?: string | undefined;
+  readonly mcpServers?: Record<string, McpServerConfig> | undefined;
   readonly maxTurns?: number;
   readonly runId: string;
   readonly sessionId: string;
@@ -53,6 +55,7 @@ export interface RunResult {
   readonly text: string;
   readonly usage: { inputTokens: number; outputTokens: number };
   readonly numTurns: number;
+  readonly sdkSessionId?: string | undefined;
   readonly error?: string;
 }
 
@@ -75,6 +78,7 @@ export async function runAgent(req: RunRequest): Promise<RunResult> {
   let fullText = "";
   let usage = { inputTokens: 0, outputTokens: 0 };
   let numTurns = 0;
+  let sdkSessionId: string | undefined;
   let error: string | undefined;
   try {
     const options: Parameters<typeof query>[0]["options"] = {
@@ -86,6 +90,8 @@ export async function runAgent(req: RunRequest): Promise<RunResult> {
     };
     if (req.systemPrompt !== undefined) options.systemPrompt = req.systemPrompt;
     if (req.model !== undefined) options.model = req.model;
+    if (req.resumeSessionId !== undefined) options.resume = req.resumeSessionId;
+    if (req.mcpServers !== undefined) options.mcpServers = req.mcpServers;
 
     const conversation = query({
       prompt: req.prompt,
@@ -130,6 +136,7 @@ export async function runAgent(req: RunRequest): Promise<RunResult> {
         }
         case "result": {
           const result = message as SDKResultMessage;
+          sdkSessionId = result.session_id;
           if (result.subtype !== "success") {
             error = `result_${result.subtype}`;
           }
@@ -144,6 +151,7 @@ export async function runAgent(req: RunRequest): Promise<RunResult> {
       text: fullText,
       usage,
       numTurns,
+      sdkSessionId,
       ...(error !== undefined ? { error } : {}),
     };
   } catch (e) {
@@ -152,6 +160,7 @@ export async function runAgent(req: RunRequest): Promise<RunResult> {
       text: fullText,
       usage,
       numTurns,
+      sdkSessionId,
       error: e instanceof Error ? e.message : String(e),
     };
   }