diff --git a/src/agents/tools/slack-actions.ts b/src/agents/tools/slack-actions.ts
index 00d567428..b3a323a1c 100644
--- a/src/agents/tools/slack-actions.ts
+++ b/src/agents/tools/slack-actions.ts
@@ -5,10 +5,12 @@ import { resolveSlackAccount } from "../../slack/accounts.js";
 import {
   deleteSlackMessage,
   editSlackMessage,
+  getSlackChannelInfo,
   getSlackMemberInfo,
   listSlackEmojis,
   listSlackPins,
   listSlackReactions,
+  markSlackChannelRead,
   pinSlackMessage,
   reactSlackMessage,
   readSlackMessages,
@@ -296,5 +298,30 @@ export async function handleSlackAction(
     return jsonResult({ ok: true, emojis });
   }
 
+  if (action === "channelInfo") {
+    if (!isActionEnabled("channelInfo")) {
+      throw new Error("Slack channel info is disabled.");
+    }
+    const channelId = resolveChannelId();
+    const info = readOpts
+      ? await getSlackChannelInfo(channelId, readOpts)
+      : await getSlackChannelInfo(channelId);
+    return jsonResult({ ok: true, ...info });
+  }
+
+  if (action === "markRead") {
+    if (!isActionEnabled("channelInfo")) {
+      throw new Error("Slack channel info is disabled.");
+    }
+    const channelId = resolveChannelId();
+    const timestamp = readStringParam(params, "timestamp", { required: true });
+    if (writeOpts) {
+      await markSlackChannelRead(channelId, timestamp, writeOpts);
+    } else {
+      await markSlackChannelRead(channelId, timestamp);
+    }
+    return jsonResult({ ok: true, markedAt: timestamp });
+  }
+
   throw new Error(`Unknown action: ${action}`);
 }
diff --git a/src/channels/plugins/message-action-names.ts b/src/channels/plugins/message-action-names.ts
index 1884cacb0..fad27474c 100644
--- a/src/channels/plugins/message-action-names.ts
+++ b/src/channels/plugins/message-action-names.ts
@@ -34,6 +34,7 @@ export const CHANNEL_MESSAGE_ACTION_NAMES = [
   "role-add",
   "role-remove",
   "channel-info",
+  "mark-read",
   "channel-list",
   "channel-create",
   "channel-edit",
diff --git a/src/channels/plugins/slack.actions.ts b/src/channels/plugins/slack.actions.ts
index ca8aa6fb8..d04b346a4 100644
--- a/src/channels/plugins/slack.actions.ts
+++ b/src/channels/plugins/slack.actions.ts
@@ -46,6 +46,10 @@ export function createSlackActions(providerId: string): ChannelMessageActionAdap
       }
       if (isActionEnabled("memberInfo")) actions.add("member-info");
       if (isActionEnabled("emojiList")) actions.add("emoji-list");
+      if (isActionEnabled("channelInfo")) {
+        actions.add("channel-info");
+        actions.add("mark-read");
+      }
       return Array.from(actions);
     },
     extractToolSend: ({ args }): ChannelToolSend | null => {
@@ -204,6 +208,30 @@ export function createSlackActions(providerId: string): ChannelMessageActionAdap
         );
       }
 
+      if (action === "channel-info") {
+        return await handleSlackAction(
+          {
+            action: "channelInfo",
+            channelId: resolveChannelId(),
+            accountId: accountId ?? undefined,
+          },
+          cfg,
+        );
+      }
+
+      if (action === "mark-read") {
+        const timestamp = readStringParam(params, "timestamp", { required: true });
+        return await handleSlackAction(
+          {
+            action: "markRead",
+            channelId: resolveChannelId(),
+            timestamp,
+            accountId: accountId ?? undefined,
+          },
+          cfg,
+        );
+      }
+
       throw new Error(`Action ${action} is not supported for provider ${providerId}.`);
     },
   };
diff --git a/src/infra/outbound/message-action-spec.ts b/src/infra/outbound/message-action-spec.ts
index 639e641d0..3951f0d8a 100644
--- a/src/infra/outbound/message-action-spec.ts
+++ b/src/infra/outbound/message-action-spec.ts
@@ -39,6 +39,7 @@ export const MESSAGE_ACTION_TARGET_MODE: Record<ChannelMessageActionName, Messag
     "role-add": "none",
     "role-remove": "none",
     "channel-info": "channelId",
+    "mark-read": "channelId",
     "channel-list": "none",
     "channel-create": "none",
     "channel-edit": "channelId",
diff --git a/src/slack/actions.ts b/src/slack/actions.ts
index 4ce6b37ca..2fc3c7ed7 100644
--- a/src/slack/actions.ts
+++ b/src/slack/actions.ts
@@ -258,3 +258,46 @@ export async function listSlackPins(
   const result = await client.pins.list({ channel: channelId });
   return (result.items ?? []) as SlackPin[];
 }
+
+export type SlackChannelInfo = {
+  id?: string;
+  name?: string;
+  lastRead?: string;
+  unreadCount?: number;
+  unreadCountDisplay?: number;
+  latest?: string;
+};
+
+/**
+ * Get channel info including unread state (last_read, unread_count).
+ * Useful for tracking what messages the bot hasn't processed yet.
+ */
+export async function getSlackChannelInfo(
+  channelId: string,
+  opts: SlackActionClientOpts = {},
+): Promise<SlackChannelInfo> {
+  const client = await getClient(opts);
+  const result = await client.conversations.info({ channel: channelId });
+  const channel = result.channel as Record<string, unknown> | undefined;
+  return {
+    id: channel?.id as string | undefined,
+    name: channel?.name as string | undefined,
+    lastRead: channel?.last_read as string | undefined,
+    unreadCount: channel?.unread_count as number | undefined,
+    unreadCountDisplay: channel?.unread_count_display as number | undefined,
+    latest: (channel?.latest as Record<string, unknown> | undefined)?.ts as string | undefined,
+  };
+}
+
+/**
+ * Mark a channel as read up to a specific timestamp.
+ * Updates the bot's read cursor for the channel.
+ */
+export async function markSlackChannelRead(
+  channelId: string,
+  timestamp: string,
+  opts: SlackActionClientOpts = {},
+): Promise<void> {
+  const client = await getClient(opts);
+  await client.conversations.mark({ channel: channelId, ts: timestamp });
+}