fix: isolate Slack thread sessions (#758)

src/slack/monitor/context.ts

@@ -74,6 +74,8 @@ export type SlackMonitorContext = {
   reactionMode: SlackReactionNotificationMode;
   reactionAllowlist: Array<string | number>;
   replyToMode: "off" | "first" | "all";
+  threadHistoryScope: "thread" | "channel";
+  threadInheritParent: boolean;
   slashCommand: Required<import("../../config/config.js").SlackSlashCommandConfig>;
   textLimit: number;
   ackReactionScope: string;
@@ -133,6 +135,8 @@ export function createSlackMonitorContext(params: {
   reactionMode: SlackReactionNotificationMode;
   reactionAllowlist: Array<string | number>;
   replyToMode: SlackMonitorContext["replyToMode"];
+  threadHistoryScope: SlackMonitorContext["threadHistoryScope"];
+  threadInheritParent: SlackMonitorContext["threadInheritParent"];
   slashCommand: SlackMonitorContext["slashCommand"];
   textLimit: number;
   ackReactionScope: string;
@@ -363,6 +367,8 @@ export function createSlackMonitorContext(params: {
     reactionMode: params.reactionMode,
     reactionAllowlist: params.reactionAllowlist,
     replyToMode: params.replyToMode,
+    threadHistoryScope: params.threadHistoryScope,
+    threadInheritParent: params.threadInheritParent,
     slashCommand: params.slashCommand,
     textLimit: params.textLimit,
     ackReactionScope: params.ackReactionScope,

src/slack/monitor/message-handler/prepare.ts

@@ -263,7 +263,6 @@ export async function prepareSlackMessage(params: {
       : null;
 
   const roomLabel = channelName ? `#${channelName}` : `#${message.channel}`;
-  const historyKey = message.channel;
   const historyEntry =
     isRoomish && ctx.historyLimit > 0
       ? {
@@ -291,9 +290,11 @@ export async function prepareSlackMessage(params: {
   const threadKeys = resolveThreadSessionKeys({
     baseSessionKey,
     threadId: isThreadReply ? threadTs : undefined,
-    parentSessionKey: isThreadReply ? baseSessionKey : undefined,
+    parentSessionKey: isThreadReply && ctx.threadInheritParent ? baseSessionKey : undefined,
   });
   const sessionKey = threadKeys.sessionKey;
+  const historyKey =
+    isThreadReply && ctx.threadHistoryScope === "thread" ? sessionKey : message.channel;
   enqueueSystemEvent(`${inboundLabel}: ${preview}`, {
     sessionKey,
     contextKey: `slack:message:${message.channel}:${message.ts ?? "unknown"}`,

src/slack/monitor/provider.ts

@@ -74,6 +74,8 @@ export async function monitorSlackProvider(opts: MonitorSlackOpts = {}) {
   const reactionMode = slackCfg.reactionNotifications ?? "own";
   const reactionAllowlist = slackCfg.reactionAllowlist ?? [];
   const replyToMode = slackCfg.replyToMode ?? "off";
+  const threadHistoryScope = slackCfg.thread?.historyScope ?? "thread";
+  const threadInheritParent = slackCfg.thread?.inheritParent ?? false;
   const slashCommand = resolveSlackSlashCommandConfig(opts.slashCommand ?? slackCfg.slashCommand);
   const textLimit = resolveTextChunkLimit(cfg, "slack", account.accountId);
   const ackReactionScope = cfg.messages?.ackReactionScope ?? "group-mentions";
@@ -129,6 +131,8 @@ export async function monitorSlackProvider(opts: MonitorSlackOpts = {}) {
     reactionMode,
     reactionAllowlist,
     replyToMode,
+    threadHistoryScope,
+    threadInheritParent,
     slashCommand,
     textLimit,
     ackReactionScope,