diff --git a/config/phantom.yaml b/config/phantom.yaml
index c8481c1..a35b327 100644
--- a/config/phantom.yaml
+++ b/config/phantom.yaml
@@ -6,6 +6,13 @@ effort: max
 max_budget_usd: 0
 timeout_minutes: 240
 
+provider:
+  type: openrouter
+  api_key_env: OPENROUTER_API_KEY
+  model_mappings:
+    opus: moonshotai/kimi-k2.6
+    sonnet: deepseek/deepseek-v3.2
+    haiku: poolside/laguna-xs.2:free
 # Peer Phantom connections (other Phantoms this instance can query via MCP)
 # peers:
 #   swe-phantom:
diff --git a/src/channels/slack.ts b/src/channels/slack.ts
index ebbaa7d..1ca4d3e 100644
--- a/src/channels/slack.ts
+++ b/src/channels/slack.ts
@@ -52,6 +52,7 @@ export class SlackChannel implements Channel {
 	private ownerUserId: string | null;
 	private phantomName: string;
 	private rejectedUsers = new Set<string>();
+	private participatedThreads = new Set<string>();
 
 	constructor(config: SlackChannelConfig) {
 		if (config.transport && config.transport !== "socket") {
@@ -199,6 +200,10 @@ export class SlackChannel implements Channel {
 		return egressRemoveReaction(this.egressContext(), channel, messageTs, emoji);
 	}
 
+	trackThreadParticipation(channelId: string, threadTs: string): void {
+		this.participatedThreads.add(`${channelId}:${threadTs}`);
+	}
+
 	private registerEventHandlers(): void {
 		this.app.event("app_mention", async ({ event, client: _client }) => {
 			if (!this.messageHandler) return;
@@ -251,7 +256,13 @@ export class SlackChannel implements Channel {
 			if (this.botUserId && userId === this.botUserId) return;
 
 			const channelType = msg.channel_type as string | undefined;
-			if (channelType !== "im") return;
+			if (channelType !== "im") {
+				// In channels, only respond to thread replies in threads we've participated in
+				const incomingThreadTs = msg.thread_ts as string | undefined;
+				if (!incomingThreadTs) return;
+				const threadKey = `${msg.channel as string}:${incomingThreadTs}`;
+				if (!this.participatedThreads.has(threadKey)) return;
+			}
 
 			if (userId && !this.isOwner(userId)) {
 				console.log(`[slack] Ignoring DM from non-owner: ${userId}`);
diff --git a/src/index.ts b/src/index.ts
index e4208a7..f993c49 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -626,12 +626,20 @@ async function main(): Promise<void> {
 		if (progressStream) {
 			// Slack: update the progress message with the final response + feedback buttons
 			await progressStream.finish(response.text);
+			// Thread participation tracking is Socket Mode only for now (see: rossja/phantom#1)
+			if (slackChannel && slackChannelId && slackThreadTs && !(slackChannel instanceof SlackHttpChannel)) {
+				slackChannel.trackThreadParticipation(slackChannelId, slackThreadTs);
+			}
 		} else if (isSlack && slackChannel && slackChannelId && slackThreadTs) {
 			// Slack fallback: send direct reply with feedback
 			const thinkingTs = await slackChannel.postThinking(slackChannelId, slackThreadTs);
 			if (thinkingTs) {
 				await slackChannel.updateWithFeedback(slackChannelId, thinkingTs, response.text);
 			}
+			// Thread participation tracking is Socket Mode only for now (see: rossja/phantom#1)
+			if (!(slackChannel instanceof SlackHttpChannel)) {
+				slackChannel.trackThreadParticipation(slackChannelId, slackThreadTs);
+			}
 		} else {
 			// All other channels: send via router
 			await router.send(msg.channelId, msg.conversationId, {