diff --git a/CHANGELOG.md b/CHANGELOG.md
index 89a63f827..d088a404d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,6 +44,7 @@ Docs: https://docs.clawd.bot
 - Auth: skip auth profiles in cooldown during initial selection and rotation. (#1316) Thanks @odrobnik.
 - Agents/TUI: honor user-pinned auth profiles during cooldown and preserve search picker ranking. (#1432) Thanks @tobiasbischoff.
 - Docs: fix gog auth services example to include docs scope. (#1454) Thanks @zerone0x.
+- Slack: reduce WebClient retries to avoid duplicate sends. (#1481)
 - Slack: read thread replies for message reads when threadId is provided (replies-only). (#1450) Thanks @rodrigouroz.
 - macOS: prefer linked channels in gateway summary to avoid false “not linked” status.
 - macOS/tests: fix gateway summary lookup after guard unwrap; prevent browser opens during tests. (ECID-1483)
diff --git a/src/slack/actions.ts b/src/slack/actions.ts
index d045bda3b..4ce6b37ca 100644
--- a/src/slack/actions.ts
+++ b/src/slack/actions.ts
@@ -1,8 +1,9 @@
-import { WebClient } from "@slack/web-api";
+import type { WebClient } from "@slack/web-api";
 
 import { loadConfig } from "../config/config.js";
 import { logVerbose } from "../globals.js";
 import { resolveSlackAccount } from "./accounts.js";
+import { createSlackWebClient } from "./client.js";
 import { sendMessageSlack } from "./send.js";
 import { resolveSlackBotToken } from "./token.js";
 
@@ -56,7 +57,7 @@ function normalizeEmoji(raw: string) {
 
 async function getClient(opts: SlackActionClientOpts = {}) {
   const token = resolveToken(opts.token, opts.accountId);
-  return opts.client ?? new WebClient(token);
+  return opts.client ?? createSlackWebClient(token);
 }
 
 async function resolveBotUserId(client: WebClient) {
diff --git a/src/slack/client.test.ts b/src/slack/client.test.ts
new file mode 100644
index 000000000..370e2d250
--- /dev/null
+++ b/src/slack/client.test.ts
@@ -0,0 +1,46 @@
+import { describe, expect, it, vi } from "vitest";
+
+vi.mock("@slack/web-api", () => {
+  const WebClient = vi.fn(function WebClientMock(
+    this: Record<string, unknown>,
+    token: string,
+    options?: Record<string, unknown>,
+  ) {
+    this.token = token;
+    this.options = options;
+  });
+  return { WebClient };
+});
+
+const slackWebApi = await import("@slack/web-api");
+const { createSlackWebClient, resolveSlackWebClientOptions, SLACK_DEFAULT_RETRY_OPTIONS } =
+  await import("./client.js");
+
+const WebClient = slackWebApi.WebClient as unknown as ReturnType<typeof vi.fn>;
+
+describe("slack web client config", () => {
+  it("applies the default retry config when none is provided", () => {
+    const options = resolveSlackWebClientOptions();
+
+    expect(options.retryConfig).toEqual(SLACK_DEFAULT_RETRY_OPTIONS);
+  });
+
+  it("respects explicit retry config overrides", () => {
+    const customRetry = { retries: 0 };
+    const options = resolveSlackWebClientOptions({ retryConfig: customRetry });
+
+    expect(options.retryConfig).toBe(customRetry);
+  });
+
+  it("passes merged options into WebClient", () => {
+    createSlackWebClient("xoxb-test", { timeout: 1234 });
+
+    expect(WebClient).toHaveBeenCalledWith(
+      "xoxb-test",
+      expect.objectContaining({
+        timeout: 1234,
+        retryConfig: SLACK_DEFAULT_RETRY_OPTIONS,
+      }),
+    );
+  });
+});
diff --git a/src/slack/client.ts b/src/slack/client.ts
new file mode 100644
index 000000000..f792bd22a
--- /dev/null
+++ b/src/slack/client.ts
@@ -0,0 +1,20 @@
+import { type RetryOptions, type WebClientOptions, WebClient } from "@slack/web-api";
+
+export const SLACK_DEFAULT_RETRY_OPTIONS: RetryOptions = {
+  retries: 2,
+  factor: 2,
+  minTimeout: 500,
+  maxTimeout: 3000,
+  randomize: true,
+};
+
+export function resolveSlackWebClientOptions(options: WebClientOptions = {}): WebClientOptions {
+  return {
+    ...options,
+    retryConfig: options.retryConfig ?? SLACK_DEFAULT_RETRY_OPTIONS,
+  };
+}
+
+export function createSlackWebClient(token: string, options: WebClientOptions = {}) {
+  return new WebClient(token, resolveSlackWebClientOptions(options));
+}
diff --git a/src/slack/directory-live.ts b/src/slack/directory-live.ts
index dd92ba848..57da909e0 100644
--- a/src/slack/directory-live.ts
+++ b/src/slack/directory-live.ts
@@ -1,4 +1,4 @@
-import { WebClient } from "@slack/web-api";
+import { createSlackWebClient } from "./client.js";
 
 import type { ChannelDirectoryEntry } from "../channels/plugins/types.js";
 import type { DirectoryConfigParams } from "../channels/plugins/directory-config.js";
@@ -61,7 +61,7 @@ export async function listSlackDirectoryPeersLive(
 ): Promise<ChannelDirectoryEntry[]> {
   const token = resolveReadToken(params);
   if (!token) return [];
-  const client = new WebClient(token);
+  const client = createSlackWebClient(token);
   const query = normalizeQuery(params.query);
   const members: SlackUser[] = [];
   let cursor: string | undefined;
@@ -119,7 +119,7 @@ export async function listSlackDirectoryGroupsLive(
 ): Promise<ChannelDirectoryEntry[]> {
   const token = resolveReadToken(params);
   if (!token) return [];
-  const client = new WebClient(token);
+  const client = createSlackWebClient(token);
   const query = normalizeQuery(params.query);
   const channels: SlackChannel[] = [];
   let cursor: string | undefined;
diff --git a/src/slack/monitor/provider.ts b/src/slack/monitor/provider.ts
index 2583eb7ba..366a32a34 100644
--- a/src/slack/monitor/provider.ts
+++ b/src/slack/monitor/provider.ts
@@ -17,6 +17,7 @@ import { resolveSlackChannelAllowlist } from "../resolve-channels.js";
 import { resolveSlackUserAllowlist } from "../resolve-users.js";
 import { resolveSlackAppToken, resolveSlackBotToken } from "../token.js";
 import { normalizeSlackWebhookPath, registerSlackHttpHandler } from "../http/index.js";
+import { resolveSlackWebClientOptions } from "../client.js";
 import { resolveSlackSlashCommandConfig } from "./commands.js";
 import { createSlackMonitorContext } from "./context.js";
 import { registerSlackMonitorEvents } from "./events.js";
@@ -130,16 +131,19 @@ export async function monitorSlackProvider(opts: MonitorSlackOpts = {}) {
           endpoints: slackWebhookPath,
         })
       : null;
+  const clientOptions = resolveSlackWebClientOptions();
   const app = new App(
     slackMode === "socket"
       ? {
           token: botToken,
           appToken,
           socketMode: true,
+          clientOptions,
         }
       : {
           token: botToken,
           receiver: receiver ?? undefined,
+          clientOptions,
         },
   );
   const slackHttpHandler =
diff --git a/src/slack/probe.ts b/src/slack/probe.ts
index d06bb066a..a4e880838 100644
--- a/src/slack/probe.ts
+++ b/src/slack/probe.ts
@@ -1,4 +1,4 @@
-import { WebClient } from "@slack/web-api";
+import { createSlackWebClient } from "./client.js";
 
 export type SlackProbe = {
   ok: boolean;
@@ -21,7 +21,7 @@ function withTimeout<T>(promise: Promise<T>, timeoutMs: number): Promise<T> {
 }
 
 export async function probeSlack(token: string, timeoutMs = 2500): Promise<SlackProbe> {
-  const client = new WebClient(token);
+  const client = createSlackWebClient(token);
   const start = Date.now();
   try {
     const result = await withTimeout(client.auth.test(), timeoutMs);
diff --git a/src/slack/resolve-channels.ts b/src/slack/resolve-channels.ts
index 2b70e6d98..b9f14bcf0 100644
--- a/src/slack/resolve-channels.ts
+++ b/src/slack/resolve-channels.ts
@@ -1,4 +1,6 @@
-import { WebClient } from "@slack/web-api";
+import type { WebClient } from "@slack/web-api";
+
+import { createSlackWebClient } from "./client.js";
 
 export type SlackChannelLookup = {
   id: string;
@@ -84,7 +86,7 @@ export async function resolveSlackChannelAllowlist(params: {
   entries: string[];
   client?: WebClient;
 }): Promise<SlackChannelResolution[]> {
-  const client = params.client ?? new WebClient(params.token);
+  const client = params.client ?? createSlackWebClient(params.token);
   const channels = await listSlackChannels(client);
   const results: SlackChannelResolution[] = [];
 
diff --git a/src/slack/resolve-users.ts b/src/slack/resolve-users.ts
index 034923399..a87057b5c 100644
--- a/src/slack/resolve-users.ts
+++ b/src/slack/resolve-users.ts
@@ -1,4 +1,6 @@
-import { WebClient } from "@slack/web-api";
+import type { WebClient } from "@slack/web-api";
+
+import { createSlackWebClient } from "./client.js";
 
 export type SlackUserLookup = {
   id: string;
@@ -101,7 +103,7 @@ export async function resolveSlackUserAllowlist(params: {
   entries: string[];
   client?: WebClient;
 }): Promise<SlackUserResolution[]> {
-  const client = params.client ?? new WebClient(params.token);
+  const client = params.client ?? createSlackWebClient(params.token);
   const users = await listSlackUsers(client);
   const results: SlackUserResolution[] = [];
 
diff --git a/src/slack/scopes.ts b/src/slack/scopes.ts
index 7cb7addb1..911f0f5b9 100644
--- a/src/slack/scopes.ts
+++ b/src/slack/scopes.ts
@@ -1,4 +1,6 @@
-import { WebClient } from "@slack/web-api";
+import type { WebClient } from "@slack/web-api";
+
+import { createSlackWebClient } from "./client.js";
 
 export type SlackScopesResult = {
   ok: boolean;
@@ -81,7 +83,7 @@ export async function fetchSlackScopes(
   token: string,
   timeoutMs: number,
 ): Promise<SlackScopesResult> {
-  const client = new WebClient(token, { timeout: timeoutMs });
+  const client = createSlackWebClient(token, { timeout: timeoutMs });
   const attempts: SlackScopesSource[] = ["auth.scopes", "apps.permissions.info"];
   const errors: string[] = [];
 
diff --git a/src/slack/send.ts b/src/slack/send.ts
index a3d61cdef..06de9770d 100644
--- a/src/slack/send.ts
+++ b/src/slack/send.ts
@@ -1,4 +1,4 @@
-import { type FilesUploadV2Arguments, WebClient } from "@slack/web-api";
+import { type FilesUploadV2Arguments, type WebClient } from "@slack/web-api";
 
 import { resolveTextChunkLimit } from "../auto-reply/chunk.js";
 import { loadConfig } from "../config/config.js";
@@ -6,6 +6,7 @@ import { logVerbose } from "../globals.js";
 import { loadWebMedia } from "../web/media.js";
 import type { SlackTokenSource } from "./accounts.js";
 import { resolveSlackAccount } from "./accounts.js";
+import { createSlackWebClient } from "./client.js";
 import { markdownToSlackMrkdwnChunks } from "./format.js";
 import { parseSlackTarget } from "./targets.js";
 import { resolveSlackBotToken } from "./token.js";
@@ -137,7 +138,7 @@ export async function sendMessageSlack(
     fallbackToken: account.botToken,
     fallbackSource: account.botTokenSource,
   });
-  const client = opts.client ?? new WebClient(token);
+  const client = opts.client ?? createSlackWebClient(token);
   const recipient = parseRecipient(to);
   const { channelId } = await resolveChannelId(client, recipient);
   const textLimit = resolveTextChunkLimit(cfg, "slack", account.accountId);