diff --git a/src/channels/discord/plugin-sdk-bridge.ts b/src/channels/discord/plugin-sdk-bridge.ts
index 2243550e402..b2a9009458b 100644
--- a/src/channels/discord/plugin-sdk-bridge.ts
+++ b/src/channels/discord/plugin-sdk-bridge.ts
@@ -5,11 +5,6 @@ export type {
   InspectedDiscordAccount,
   ResolvedDiscordAccount,
 } from "../../../extensions/discord/api.js";
-export type {
-  ThreadBindingManager,
-  ThreadBindingRecord,
-  ThreadBindingTargetKind,
-} from "../../../extensions/discord/runtime-api.js";
 
 export {
   collectDiscordStatusIssues,
@@ -29,7 +24,6 @@ export {
 export {
   addRoleDiscord,
   auditDiscordChannelPermissions,
-  autoBindSpawnedDiscordSubagent,
   banMemberDiscord,
   collectDiscordAuditChannelIds,
   createChannelDiscord,
@@ -51,7 +45,6 @@ export {
   fetchVoiceStatusDiscord,
   getGateway,
   getPresence,
-  getThreadBindingManager,
   hasAnyGuildPermissionDiscord,
   kickMemberDiscord,
   listDiscordDirectoryGroupsLive,
@@ -60,7 +53,6 @@ export {
   listGuildEmojisDiscord,
   listPinsDiscord,
   listScheduledEventsDiscord,
-  listThreadBindingsBySessionKey,
   listThreadsDiscord,
   monitorDiscordProvider,
   moveChannelDiscord,
@@ -74,10 +66,6 @@ export {
   removeRoleDiscord,
   resolveDiscordChannelAllowlist,
   resolveDiscordUserAllowlist,
-  resolveThreadBindingIdleTimeoutMs,
-  resolveThreadBindingInactivityExpiresAt,
-  resolveThreadBindingMaxAgeExpiresAt,
-  resolveThreadBindingMaxAgeMs,
   searchMessagesDiscord,
   sendDiscordComponentMessage,
   sendMessageDiscord,
@@ -86,15 +74,11 @@ export {
   sendTypingDiscord,
   sendVoiceMessageDiscord,
   setChannelPermissionDiscord,
-  setThreadBindingIdleTimeoutBySessionKey,
-  setThreadBindingMaxAgeBySessionKey,
   timeoutMemberDiscord,
-  unbindThreadBindingsBySessionKey,
   unpinMessageDiscord,
   uploadEmojiDiscord,
   uploadStickerDiscord,
 } from "../../../extensions/discord/runtime-api.js";
-export { normalizeExplicitDiscordSessionKey } from "../../../extensions/discord/session-key-api.js";
 export {
   listDiscordDirectoryGroupsFromConfig,
   listDiscordDirectoryPeersFromConfig,
diff --git a/src/plugin-sdk/channel-import-guardrails.test.ts b/src/plugin-sdk/channel-import-guardrails.test.ts
index b5580c8b906..ca550e9c83a 100644
--- a/src/plugin-sdk/channel-import-guardrails.test.ts
+++ b/src/plugin-sdk/channel-import-guardrails.test.ts
@@ -352,6 +352,22 @@ function expectNoSiblingExtensionPrivateSrcImports(file: string, imports: string
 }
 
 describe("channel import guardrails", () => {
+  it("keeps Discord threading ownership on extension public seams", () => {
+    const text = readSource("src/plugin-sdk/discord.ts");
+    const bridgeImports = [...text.matchAll(/import(?: type)?\s*\{[\s\S]*?\}\s*from\s+"[^"]+";/g)]
+      .map((match) => match[0])
+      .filter((statement) => statement.includes("../channels/discord/plugin-sdk-bridge.js"))
+      .join("\n");
+    expect(bridgeImports).not.toMatch(
+      /\b(?:ThreadBindingManager|ThreadBindingRecord|ThreadBindingTargetKind)\b/,
+    );
+    expect(bridgeImports).not.toMatch(
+      /\b(?:autoBindSpawnedDiscordSubagent|getThreadBindingManager|listThreadBindingsBySessionKey|resolveThreadBindingIdleTimeoutMs|resolveThreadBindingInactivityExpiresAt|resolveThreadBindingMaxAgeExpiresAt|resolveThreadBindingMaxAgeMs|setThreadBindingIdleTimeoutBySessionKey|setThreadBindingMaxAgeBySessionKey|unbindThreadBindingsBySessionKey)\b/,
+    );
+    expect(text).toMatch(/from\s+"..\/..\/extensions\/discord\/runtime-api\.js";/);
+    expect(text).toMatch(/from\s+"..\/..\/extensions\/discord\/session-key-api\.js";/);
+  });
+
   it("keeps channel helper modules off their own SDK barrels", () => {
     for (const source of SAME_CHANNEL_SDK_GUARDS) {
       const text = readSource(source.path);
diff --git a/src/plugin-sdk/discord.ts b/src/plugin-sdk/discord.ts
index 063717815cb..ec1abd7bd0b 100644
--- a/src/plugin-sdk/discord.ts
+++ b/src/plugin-sdk/discord.ts
@@ -1,12 +1,27 @@
+import type {
+  ThreadBindingManager,
+  ThreadBindingRecord,
+  ThreadBindingTargetKind,
+} from "../../extensions/discord/runtime-api.js";
+import {
+  autoBindSpawnedDiscordSubagent,
+  getThreadBindingManager,
+  listThreadBindingsBySessionKey,
+  resolveThreadBindingIdleTimeoutMs,
+  resolveThreadBindingInactivityExpiresAt,
+  resolveThreadBindingMaxAgeExpiresAt,
+  resolveThreadBindingMaxAgeMs,
+  setThreadBindingIdleTimeoutBySessionKey,
+  setThreadBindingMaxAgeBySessionKey,
+  unbindThreadBindingsBySessionKey,
+} from "../../extensions/discord/runtime-api.js";
+import { normalizeExplicitDiscordSessionKey } from "../../extensions/discord/session-key-api.js";
 import type {
   DiscordPluralKitConfig,
   DiscordSendComponents,
   DiscordSendEmbeds,
   InspectedDiscordAccount,
   ResolvedDiscordAccount,
-  ThreadBindingManager,
-  ThreadBindingRecord,
-  ThreadBindingTargetKind,
 } from "../channels/discord/plugin-sdk-bridge.js";
 import {
   collectDiscordStatusIssues,
@@ -25,7 +40,6 @@ import {
 import {
   addRoleDiscord,
   auditDiscordChannelPermissions,
-  autoBindSpawnedDiscordSubagent,
   banMemberDiscord,
   collectDiscordAuditChannelIds,
   createChannelDiscord,
@@ -47,7 +61,6 @@ import {
   fetchVoiceStatusDiscord,
   getGateway,
   getPresence,
-  getThreadBindingManager,
   hasAnyGuildPermissionDiscord,
   kickMemberDiscord,
   listDiscordDirectoryGroupsLive,
@@ -56,7 +69,6 @@ import {
   listGuildEmojisDiscord,
   listPinsDiscord,
   listScheduledEventsDiscord,
-  listThreadBindingsBySessionKey,
   listThreadsDiscord,
   monitorDiscordProvider,
   moveChannelDiscord,
@@ -70,10 +82,6 @@ import {
   removeRoleDiscord,
   resolveDiscordChannelAllowlist,
   resolveDiscordUserAllowlist,
-  resolveThreadBindingIdleTimeoutMs,
-  resolveThreadBindingInactivityExpiresAt,
-  resolveThreadBindingMaxAgeExpiresAt,
-  resolveThreadBindingMaxAgeMs,
   searchMessagesDiscord,
   sendDiscordComponentMessage,
   sendMessageDiscord,
@@ -82,16 +90,12 @@ import {
   sendTypingDiscord,
   sendVoiceMessageDiscord,
   setChannelPermissionDiscord,
-  setThreadBindingIdleTimeoutBySessionKey,
-  setThreadBindingMaxAgeBySessionKey,
   timeoutMemberDiscord,
-  unbindThreadBindingsBySessionKey,
   unpinMessageDiscord,
   uploadEmojiDiscord,
   uploadStickerDiscord,
   listDiscordDirectoryGroupsFromConfig,
   listDiscordDirectoryPeersFromConfig,
-  normalizeExplicitDiscordSessionKey,
 } from "../channels/discord/plugin-sdk-bridge.js";
 
 export type {
diff --git a/src/plugin-sdk/subpaths.test.ts b/src/plugin-sdk/subpaths.test.ts
index ec0f4cb8d79..8de2d6d1d4c 100644
--- a/src/plugin-sdk/subpaths.test.ts
+++ b/src/plugin-sdk/subpaths.test.ts
@@ -266,6 +266,9 @@ describe("plugin-sdk subpath exports", () => {
   it("exports Discord helpers", () => {
     expect(typeof discordSdk.buildChannelConfigSchema).toBe("function");
     expect(typeof discordSdk.DiscordConfigSchema).toBe("object");
+    expect(typeof discordSdk.getThreadBindingManager).toBe("function");
+    expect(typeof discordSdk.listThreadBindingsBySessionKey).toBe("function");
+    expect(typeof discordSdk.normalizeExplicitDiscordSessionKey).toBe("function");
     expect(typeof discordSdk.projectCredentialSnapshotFields).toBe("function");
     expect("resolveDiscordAccount" in asExports(discordSdk)).toBe(false);
   });