diff --git a/src/agents/tools/slack-actions.ts b/src/agents/tools/slack-actions.ts
new file mode 100644
index 000000000..e726b710c
--- /dev/null
+++ b/src/agents/tools/slack-actions.ts
@@ -0,0 +1,163 @@
+import type { AgentToolResult } from "@mariozechner/pi-agent-core";
+
+import type { ClawdisConfig, SlackActionConfig } from "../../config/config.js";
+import {
+  deleteSlackMessage,
+  editSlackMessage,
+  getSlackMemberInfo,
+  listSlackEmojis,
+  listSlackPins,
+  listSlackReactions,
+  pinSlackMessage,
+  reactSlackMessage,
+  readSlackMessages,
+  sendSlackMessage,
+  unpinSlackMessage,
+} from "../../slack/actions.js";
+import { jsonResult, readStringParam } from "./common.js";
+
+const messagingActions = new Set([
+  "sendMessage",
+  "editMessage",
+  "deleteMessage",
+  "readMessages",
+]);
+
+const reactionsActions = new Set(["react", "reactions"]);
+const pinActions = new Set(["pinMessage", "unpinMessage", "listPins"]);
+
+type ActionGate = (
+  key: keyof SlackActionConfig,
+  defaultValue?: boolean,
+) => boolean;
+
+export async function handleSlackAction(
+  params: Record<string, unknown>,
+  cfg: ClawdisConfig,
+): Promise<AgentToolResult<unknown>> {
+  const action = readStringParam(params, "action", { required: true });
+  const isActionEnabled: ActionGate = (key, defaultValue = true) => {
+    const value = cfg.slack?.actions?.[key];
+    if (value === undefined) return defaultValue;
+    return value !== false;
+  };
+
+  if (reactionsActions.has(action)) {
+    if (!isActionEnabled("reactions")) {
+      throw new Error("Slack reactions are disabled.");
+    }
+    const channelId = readStringParam(params, "channelId", { required: true });
+    const messageId = readStringParam(params, "messageId", { required: true });
+    if (action === "react") {
+      const emoji = readStringParam(params, "emoji", { required: true });
+      await reactSlackMessage(channelId, messageId, emoji);
+      return jsonResult({ ok: true });
+    }
+    const reactions = await listSlackReactions(channelId, messageId);
+    return jsonResult({ ok: true, reactions });
+  }
+
+  if (messagingActions.has(action)) {
+    if (!isActionEnabled("messages")) {
+      throw new Error("Slack messages are disabled.");
+    }
+    switch (action) {
+      case "sendMessage": {
+        const to = readStringParam(params, "to", { required: true });
+        const content = readStringParam(params, "content", { required: true });
+        const mediaUrl = readStringParam(params, "mediaUrl");
+        const replyTo = readStringParam(params, "replyTo");
+        const result = await sendSlackMessage(to, content, {
+          mediaUrl: mediaUrl ?? undefined,
+          replyTo: replyTo ?? undefined,
+        });
+        return jsonResult({ ok: true, result });
+      }
+      case "editMessage": {
+        const channelId = readStringParam(params, "channelId", {
+          required: true,
+        });
+        const messageId = readStringParam(params, "messageId", {
+          required: true,
+        });
+        const content = readStringParam(params, "content", {
+          required: true,
+        });
+        await editSlackMessage(channelId, messageId, content);
+        return jsonResult({ ok: true });
+      }
+      case "deleteMessage": {
+        const channelId = readStringParam(params, "channelId", {
+          required: true,
+        });
+        const messageId = readStringParam(params, "messageId", {
+          required: true,
+        });
+        await deleteSlackMessage(channelId, messageId);
+        return jsonResult({ ok: true });
+      }
+      case "readMessages": {
+        const channelId = readStringParam(params, "channelId", {
+          required: true,
+        });
+        const limitRaw = params.limit;
+        const limit =
+          typeof limitRaw === "number" && Number.isFinite(limitRaw)
+            ? limitRaw
+            : undefined;
+        const before = readStringParam(params, "before");
+        const after = readStringParam(params, "after");
+        const result = await readSlackMessages(channelId, {
+          limit,
+          before: before ?? undefined,
+          after: after ?? undefined,
+        });
+        return jsonResult({ ok: true, ...result });
+      }
+      default:
+        break;
+    }
+  }
+
+  if (pinActions.has(action)) {
+    if (!isActionEnabled("pins")) {
+      throw new Error("Slack pins are disabled.");
+    }
+    const channelId = readStringParam(params, "channelId", { required: true });
+    if (action === "pinMessage") {
+      const messageId = readStringParam(params, "messageId", {
+        required: true,
+      });
+      await pinSlackMessage(channelId, messageId);
+      return jsonResult({ ok: true });
+    }
+    if (action === "unpinMessage") {
+      const messageId = readStringParam(params, "messageId", {
+        required: true,
+      });
+      await unpinSlackMessage(channelId, messageId);
+      return jsonResult({ ok: true });
+    }
+    const pins = await listSlackPins(channelId);
+    return jsonResult({ ok: true, pins });
+  }
+
+  if (action === "memberInfo") {
+    if (!isActionEnabled("memberInfo")) {
+      throw new Error("Slack member info is disabled.");
+    }
+    const userId = readStringParam(params, "userId", { required: true });
+    const info = await getSlackMemberInfo(userId);
+    return jsonResult({ ok: true, info });
+  }
+
+  if (action === "emojiList") {
+    if (!isActionEnabled("emojiList")) {
+      throw new Error("Slack emoji list is disabled.");
+    }
+    const emojis = await listSlackEmojis();
+    return jsonResult({ ok: true, emojis });
+  }
+
+  throw new Error(`Unknown action: ${action}`);
+}
diff --git a/src/agents/tools/slack-schema.ts b/src/agents/tools/slack-schema.ts
new file mode 100644
index 000000000..46fed8e25
--- /dev/null
+++ b/src/agents/tools/slack-schema.ts
@@ -0,0 +1,61 @@
+import { Type } from "@sinclair/typebox";
+
+export const SlackToolSchema = Type.Union([
+  Type.Object({
+    action: Type.Literal("react"),
+    channelId: Type.String(),
+    messageId: Type.String(),
+    emoji: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("reactions"),
+    channelId: Type.String(),
+    messageId: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("sendMessage"),
+    to: Type.String(),
+    content: Type.String(),
+    mediaUrl: Type.Optional(Type.String()),
+    replyTo: Type.Optional(Type.String()),
+  }),
+  Type.Object({
+    action: Type.Literal("editMessage"),
+    channelId: Type.String(),
+    messageId: Type.String(),
+    content: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("deleteMessage"),
+    channelId: Type.String(),
+    messageId: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("readMessages"),
+    channelId: Type.String(),
+    limit: Type.Optional(Type.Number()),
+    before: Type.Optional(Type.String()),
+    after: Type.Optional(Type.String()),
+  }),
+  Type.Object({
+    action: Type.Literal("pinMessage"),
+    channelId: Type.String(),
+    messageId: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("unpinMessage"),
+    channelId: Type.String(),
+    messageId: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("listPins"),
+    channelId: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("memberInfo"),
+    userId: Type.String(),
+  }),
+  Type.Object({
+    action: Type.Literal("emojiList"),
+  }),
+]);
diff --git a/src/agents/tools/slack-tool.ts b/src/agents/tools/slack-tool.ts
new file mode 100644
index 000000000..b0f2d0146
--- /dev/null
+++ b/src/agents/tools/slack-tool.ts
@@ -0,0 +1,18 @@
+import { loadConfig } from "../../config/config.js";
+import type { AnyAgentTool } from "./common.js";
+import { handleSlackAction } from "./slack-actions.js";
+import { SlackToolSchema } from "./slack-schema.js";
+
+export function createSlackTool(): AnyAgentTool {
+  return {
+    label: "Slack",
+    name: "slack",
+    description: "Manage Slack messages, reactions, and pins.",
+    parameters: SlackToolSchema,
+    execute: async (_toolCallId, args) => {
+      const params = args as Record<string, unknown>;
+      const cfg = loadConfig();
+      return await handleSlackAction(params, cfg);
+    },
+  };
+}
diff --git a/src/auto-reply/reply/block-streaming.ts b/src/auto-reply/reply/block-streaming.ts
index ab6ff2aed..ee973b9d9 100644
--- a/src/auto-reply/reply/block-streaming.ts
+++ b/src/auto-reply/reply/block-streaming.ts
@@ -8,6 +8,7 @@ const BLOCK_CHUNK_SURFACES = new Set<TextChunkSurface>([
   "whatsapp",
   "telegram",
   "discord",
+  "slack",
   "signal",
   "imessage",
   "webchat",