diff --git a/docs/internal/steipete/2026-03-29-config-runtime-snapshot.md b/docs/internal/steipete/2026-03-29-config-runtime-snapshot.md
index 45f3e447d54..50901b55891 100644
--- a/docs/internal/steipete/2026-03-29-config-runtime-snapshot.md
+++ b/docs/internal/steipete/2026-03-29-config-runtime-snapshot.md
@@ -21,3 +21,4 @@ read_when:
   - updated Discord preflight wording to match runtime-snapshot semantics
   - adjusted session-listing subagent selection to prefer active disk-only runs while still honoring newer in-memory replacement rows
   - deleted the flaky duplicated Telegram gateway writeback integration test and kept stable coverage in `server-methods/send.test.ts` plus `extensions/telegram/src/target-writeback.test.ts`
+  - trimmed remaining Telegram-specific assertions from `src/gateway/server-methods/send.test.ts` so core only covers generic channel-send contracts and Telegram writeback behavior stays extension-owned
diff --git a/src/gateway/server-methods/send.test.ts b/src/gateway/server-methods/send.test.ts
index 395eddb25a5..248d3689de7 100644
--- a/src/gateway/server-methods/send.test.ts
+++ b/src/gateway/server-methods/send.test.ts
@@ -214,42 +214,42 @@ describe("gateway send mirroring", () => {
   });
 
   it("forwards gateway client scopes into outbound delivery", async () => {
-    mockDeliverySuccess("m-telegram-scope");
+    mockDeliverySuccess("m-scope");
 
     await runSendWithClient(
       {
-        to: "https://t.me/mychannel",
+        to: "channel:C1",
         message: "hi",
-        channel: "telegram",
-        idempotencyKey: "idem-telegram-scope",
+        channel: "slack",
+        idempotencyKey: "idem-scope",
       },
       { connect: { scopes: ["operator.write"] } },
     );
 
     expect(mocks.deliverOutboundPayloads).toHaveBeenCalledWith(
       expect.objectContaining({
-        channel: "telegram",
+        channel: "slack",
         gatewayClientScopes: ["operator.write"],
       }),
     );
   });
 
   it("forwards an empty gateway scope array into outbound delivery", async () => {
-    mockDeliverySuccess("m-telegram-empty-scope");
+    mockDeliverySuccess("m-empty-scope");
 
     await runSendWithClient(
       {
-        to: "https://t.me/mychannel",
+        to: "channel:C1",
         message: "hi",
-        channel: "telegram",
-        idempotencyKey: "idem-telegram-empty-scope",
+        channel: "slack",
+        idempotencyKey: "idem-empty-scope",
       },
       { connect: { scopes: [] } },
     );
 
     expect(mocks.deliverOutboundPayloads).toHaveBeenCalledWith(
       expect.objectContaining({
-        channel: "telegram",
+        channel: "slack",
         gatewayClientScopes: [],
       }),
     );
@@ -367,10 +367,10 @@ describe("gateway send mirroring", () => {
   it("forwards gateway client scopes into outbound poll delivery", async () => {
     await runPollWithClient(
       {
-        to: "https://t.me/mychannel",
+        to: "channel:C1",
         question: "Q?",
         options: ["A", "B"],
-        channel: "telegram",
+        channel: "slack",
         idempotencyKey: "idem-poll-scope",
       },
       { connect: { scopes: ["operator.admin"] } },
@@ -388,10 +388,10 @@ describe("gateway send mirroring", () => {
   it("forwards an empty gateway scope array into outbound poll delivery", async () => {
     await runPollWithClient(
       {
-        to: "https://t.me/mychannel",
+        to: "channel:C1",
         question: "Q?",
         options: ["A", "B"],
-        channel: "telegram",
+        channel: "slack",
         idempotencyKey: "idem-poll-empty-scope",
       },
       { connect: { scopes: [] } },
@@ -677,37 +677,37 @@ describe("gateway send mirroring", () => {
     );
   });
 
-  it("recovers cold plugin resolution for telegram threaded sends", async () => {
+  it("recovers cold plugin resolution for threaded sends", async () => {
     mocks.resolveOutboundTarget.mockReturnValue({ ok: true, to: "123" });
     mocks.deliverOutboundPayloads.mockResolvedValue([
-      { messageId: "m-telegram", channel: "telegram" },
+      { messageId: "m-threaded", channel: "slack" },
     ]);
-    const telegramPlugin = { outbound: { sendPoll: mocks.sendPoll } };
+    const outboundPlugin = { outbound: { sendPoll: mocks.sendPoll } };
     mocks.getChannelPlugin
       .mockReturnValueOnce(undefined)
-      .mockReturnValueOnce(telegramPlugin)
-      .mockReturnValue(telegramPlugin);
+      .mockReturnValueOnce(outboundPlugin)
+      .mockReturnValue(outboundPlugin);
 
     const { respond } = await runSend({
       to: "123",
-      message: "forum completion",
-      channel: "telegram",
-      threadId: "42",
-      idempotencyKey: "idem-cold-telegram-thread",
+      message: "threaded completion",
+      channel: "slack",
+      threadId: "1710000000.9999",
+      idempotencyKey: "idem-cold-thread",
     });
 
     expect(mocks.deliverOutboundPayloads).toHaveBeenCalledWith(
       expect.objectContaining({
-        channel: "telegram",
+        channel: "slack",
         to: "123",
-        threadId: "42",
+        threadId: "1710000000.9999",
       }),
     );
     expect(respond).toHaveBeenCalledWith(
       true,
-      expect.objectContaining({ messageId: "m-telegram" }),
+      expect.objectContaining({ messageId: "m-threaded" }),
       undefined,
-      expect.objectContaining({ channel: "telegram" }),
+      expect.objectContaining({ channel: "slack" }),
     );
   });
 });