diff --git a/apps/sim/lib/knowledge/mcp/tool-arguments.ts b/apps/sim/lib/knowledge/mcp/tool-arguments.ts
index 80ee4ee4d2e..384cafcf20a 100644
--- a/apps/sim/lib/knowledge/mcp/tool-arguments.ts
+++ b/apps/sim/lib/knowledge/mcp/tool-arguments.ts
@@ -88,8 +88,8 @@ export function repairToolCallMessage(message: Record<string, unknown>) {
 }
 
 /**
- * Unrecognized field names logged per schema issue, each cut short. The schema caps native queries
- * at nine, so a rejection's log line stays bounded.
+ * Unrecognized field names logged per schema issue, each cut short. The route's request body cap
+ * bounds how many issues one rejection can carry.
  */
 const MAX_LOGGED_KEYS = 5
 const MAX_LOGGED_KEY_CHARACTERS = 64
diff --git a/apps/sim/lib/sim-search/live/providers.test.ts b/apps/sim/lib/sim-search/live/providers.test.ts
index 065636be387..50c69722f2a 100644
--- a/apps/sim/lib/sim-search/live/providers.test.ts
+++ b/apps/sim/lib/sim-search/live/providers.test.ts
@@ -448,7 +448,7 @@ describe('Slack channels', () => {
       filters: { startDate: '2026-10-30T00:00:00Z' },
       native: { provider: 'slack', query: '', modifiers: 'in:#announcements' },
     })
-    expect(result.message).toContain('No channel named #announcements is visible to this account.')
+    expect(result.message).toContain('No channel named #announcements can be searched here.')
     expect(result.message).toContain(
       'Channels with similar names: #company-announcements (in:<#C7>).'
     )
@@ -485,6 +485,38 @@ describe('Slack channels', () => {
     expect(result.message).not.toContain('#announcements')
   })
 
+  it('looks up no channel when the query is already scoped to a channel ID', async () => {
+    const api = client()
+    api.json.mockResolvedValue(rts([]))
+    const result = await searchSlack(api, {
+      ...input,
+      scopes,
+      native: { provider: 'slack', query: 'launch in:<#C1>', modifiers: 'in:#announcements' },
+    })
+    expect(api.json).toHaveBeenCalledTimes(1)
+    expect(result.message).not.toContain('#announcements')
+  })
+
+  it.each([
+    ['in:#launch-team.', 'launch-team'],
+    ['in:#équipe_ventes,', 'équipe_ventes'],
+    ['in:#हिंदी-टीम', 'हिंदी-टीम'],
+  ])('looks up the whole channel name in %s', async (modifiers, name) => {
+    const api = client()
+    api.json.mockResolvedValue(rts([]))
+    await searchSlack(api, {
+      ...input,
+      query: '',
+      scopes,
+      filters: { startDate: '2026-10-30T00:00:00Z' },
+      native: { provider: 'slack', query: '', modifiers },
+    })
+    expect(api.json.mock.calls[1]?.[1]?.body).toMatchObject({
+      query: name,
+      content_types: ['channels'],
+    })
+  })
+
   it('keeps the empty search when the channel lookup fails', async () => {
     const api = client()
     api.json
diff --git a/apps/sim/lib/sim-search/live/slack.ts b/apps/sim/lib/sim-search/live/slack.ts
index abb77bc2e42..d01a35f5b8b 100644
--- a/apps/sim/lib/sim-search/live/slack.ts
+++ b/apps/sim/lib/sim-search/live/slack.ts
@@ -65,12 +65,15 @@ function searchableChannels(data: Record<string, unknown>, input: NativeSearchIn
 const channelLabel = ({ id, name, archived }: SlackChannel) =>
   `#${name} (in:<#${id}>${archived ? ', archived' : ''})`
 
-/** The channel name an `in:#name` filter in the query or modifiers names, if any. */
+/**
+ * The channel name an `in:#name` filter in the query or modifiers names, without a trailing period.
+ * A query that also carries an `in:<#ID>` scope gets no lookup: a source limited to selected
+ * channels adds one to each search it runs per channel and drops the notes of the empty ones.
+ */
 function filteredChannelName(input: NativeSearchInput): string | undefined {
-  return [nativeText(input), input.native?.modifiers]
-    .join(' ')
-    .match(/(?:^|\s)in:#([\w.-]+)/i)?.[1]
-    ?.toLowerCase()
+  const text = [nativeText(input), input.native?.modifiers].join(' ')
+  if (text.includes('in:<#')) return undefined
+  return text.match(/(?:^|\s)in:#([\p{L}\p{M}\p{N}_.-]*[\p{L}\p{M}\p{N}_-])/iu)?.[1]?.toLowerCase()
 }
 
 /**
@@ -108,7 +111,7 @@ async function channelFilterNote(
   const complete = !string(object(data.response_metadata).next_cursor)
   const similar = channels.slice(0, MAX_LISTED_CHANNELS).map(channelLabel).join(', ')
   return joinMessages([
-    complete ? `No channel named #${name} is visible to this account.` : '',
+    complete ? `No channel named #${name} can be searched here.` : '',
     similar ? `Channels with similar names: ${similar}.` : '',
   ])
 }