diff --git a/docs/site/content/docs/agents/native-chat.mdx b/docs/site/content/docs/agents/native-chat.mdx
index 1a812697e0ad..a1a45e76ee2e 100644
--- a/docs/site/content/docs/agents/native-chat.mdx
+++ b/docs/site/content/docs/agents/native-chat.mdx
@@ -18,7 +18,7 @@ Toggle Chat UI ↔ terminal from the agent pane once enabled.
 ## Composer
 
 - Type a message and send (or stop a working turn). Attach files/images when the host supports it. Unsent draft text and attachments stay with the pane across disconnect/reconnect when the host can restore them. A settled transcript also stays on screen while the same session reconnects, instead of blanking until the fresh load finishes (desktop and mobile share that retention).
-- Type `/` for slash commands and discovered **skills** (filtered per agent when possible). The slash catalog is agent-aware (Claude vs Codex command sets) and shared with mobile Chat UI.
+- Type `/` for slash commands and discovered **skills** (filtered per agent when possible). The slash catalog is agent-aware (Claude vs Codex command sets) and shared with mobile Chat UI. In OMP ACP chats, `/fast` is sent to OMP when the current session advertises it; use OMP's `/fast status`, `/fast on`, or `/fast off` commands rather than a separate speed control.
 - Use the **model** and options pills (thought level, mode, agent-specific session options) when the agent exposes them. **Claude** model choices come from the **installed Claude CLI on that host** (not a hardcoded list), so new models show up after you update the CLI. **Codex** supports direct model selection from the pill (sends `/model <id>`), with bare `/model` still opening the agent picker. **Grok** exposes **model** (`-m` at launch, `/model` mid-session) and **reasoning effort** (`--reasoning-effort` at launch, `/effort` mid-session); the model list is probed from the signed-in Grok CLI (`grok models`) so retired ids drop out of the picker. Effort choices follow the selected model: Grok 4.6 includes **Extra high**, while Grok 4.5 stops at **High**. **Before the agent process starts**, the composer can show draft launch options that apply on first start; after the session is live, pills that only affect a running turn stay disabled or labeled until the session is ready. Live values go to the CLI in that tab.
 
 ## Questions from the agent
diff --git a/mobile/src/session/mobile-structured-agent-session-contract.ts b/mobile/src/session/mobile-structured-agent-session-contract.ts
index 79fc4574d78c..f79b392de08f 100644
--- a/mobile/src/session/mobile-structured-agent-session-contract.ts
+++ b/mobile/src/session/mobile-structured-agent-session-contract.ts
@@ -10,6 +10,7 @@ import type { NativeChatResolvedPrompt } from '../../../src/shared/native-chat-r
 import type { useMobileStructuredAgentOptions } from './use-mobile-structured-agent-options'
 import type { useMobileStructuredAgentTurnTiming } from './use-mobile-structured-agent-turn-timing'
 import type { StructuredMobileSendAttachment } from './use-mobile-structured-send-with-outcome'
+import type { AgentSessionSlashCommand } from '../../../src/shared/agent-session-wire'
 import type {
   MobileNativeChatCommandRefusalCauses,
   MobileNativeChatSendErrorReporter
@@ -20,6 +21,7 @@ import type { MobileStructuredBackgroundTasks } from './use-mobile-structured-ba
 export type StructuredMobileSession = ReturnType<typeof useMobileStructuredAgentOptions> &
   ReturnType<typeof useMobileStructuredAgentTurnTiming> & {
     session: MobileNativeChatSession
+    sessionCommands?: readonly AgentSessionSlashCommand[]
     isWorking: boolean
     turnId: string | null
     /** What labels the live turn's one indicator row. */
diff --git a/mobile/src/session/mobile-structured-composer-command.ts b/mobile/src/session/mobile-structured-composer-command.ts
index 048fb8cc1407..9531ae4e05ef 100644
--- a/mobile/src/session/mobile-structured-composer-command.ts
+++ b/mobile/src/session/mobile-structured-composer-command.ts
@@ -46,7 +46,13 @@ export async function dispatchMobileStructuredCommand(input: {
   if (input.pending.current) {
     return 'rejected'
   }
-  if (!isStructuredAgentSessionComposerCommand(input.text, input.controller.agent)) {
+  if (
+    !isStructuredAgentSessionComposerCommand(
+      input.text,
+      input.controller.agent,
+      input.controller.sessionCommands
+    )
+  ) {
     return null
   }
   if (input.hasAttachments) {
diff --git a/mobile/src/session/use-mobile-native-chat-controller.ts b/mobile/src/session/use-mobile-native-chat-controller.ts
index 04c711fd477b..be48b1b1223d 100644
--- a/mobile/src/session/use-mobile-native-chat-controller.ts
+++ b/mobile/src/session/use-mobile-native-chat-controller.ts
@@ -219,6 +219,7 @@ export function useMobileNativeChatController(args: {
 
   const structuredNativeChatSend = useMobileStructuredNativeChatSendBridge({
     agent: activeChatResolution?.agent,
+    sessionCommands: structuredNativeChat.sessionCommands,
     sendStructured: structuredNativeChat.sendWithOutcome,
     captureSendOrigin,
     clearDraftForSend,
diff --git a/mobile/src/session/use-mobile-structured-agent-session.ts b/mobile/src/session/use-mobile-structured-agent-session.ts
index 66fd76fda000..4ee8d35ae20f 100644
--- a/mobile/src/session/use-mobile-structured-agent-session.ts
+++ b/mobile/src/session/use-mobile-structured-agent-session.ts
@@ -184,6 +184,7 @@ export function useMobileStructuredAgentSession(
       stopPressed: stopPress.pressed
     }) === 'stopping'
   const stopRequestInFlight = isWorking && stopPress.pressed
+  const sessionCommands = enabled && connected ? (state.commands ?? undefined) : undefined
   const sendWithOutcome = useMobileStructuredSendWithOutcome({
     agent,
     client,
@@ -197,6 +198,7 @@ export function useMobileStructuredAgentSession(
     hold: sends.hold,
     commandPending: commandPendingRef,
     controller: sendController,
+    sessionCommands,
     onSendError,
     carriesOptions: hostSupport?.sendOptions === true
   })
@@ -283,6 +285,7 @@ export function useMobileStructuredAgentSession(
 
   return {
     ...options,
+    sessionCommands,
     visualSource,
     imagePreviewsByMessageId: sends.imagePreviewsByMessageId,
     session: {
diff --git a/mobile/src/session/use-mobile-structured-native-chat-send-bridge.ts b/mobile/src/session/use-mobile-structured-native-chat-send-bridge.ts
index c9e19224aa97..c52f350766b4 100644
--- a/mobile/src/session/use-mobile-structured-native-chat-send-bridge.ts
+++ b/mobile/src/session/use-mobile-structured-native-chat-send-bridge.ts
@@ -1,5 +1,6 @@
 import { useCallback } from 'react'
 import type { StructuredAgentId } from '../../../src/shared/agent-session-provider-handle'
+import type { AgentSessionSlashCommand } from '../../../src/shared/agent-session-wire'
 import { isStructuredAgentSessionComposerCommand } from '../../../src/shared/structured-agent-session-composer'
 import type { MobileNativeChatSendOutcome } from './mobile-native-chat-send'
 import type { MobileNativeChatSendOrigin } from './use-mobile-native-chat-drafts'
@@ -7,6 +8,7 @@ import type { StructuredMobileSendAttachment } from './use-mobile-structured-sen
 
 export function useMobileStructuredNativeChatSendBridge(args: {
   agent: StructuredAgentId | undefined
+  sessionCommands?: readonly AgentSessionSlashCommand[]
   sendStructured: (
     text: string,
     images?: string[],
@@ -28,6 +30,7 @@ export function useMobileStructuredNativeChatSendBridge(args: {
 } {
   const {
     agent,
+    sessionCommands,
     captureSendOrigin,
     clearDraftForSend,
     onSendError,
@@ -46,7 +49,7 @@ export function useMobileStructuredNativeChatSendBridge(args: {
         onSendError('Message not sent (disconnected)')
         return 'rejected'
       }
-      const isHostCommand = isStructuredAgentSessionComposerCommand(text, agent)
+      const isHostCommand = isStructuredAgentSessionComposerCommand(text, agent, sessionCommands)
       clearDraftForSend(origin, text)
       const outcome =
         attachments !== undefined
@@ -63,7 +66,15 @@ export function useMobileStructuredNativeChatSendBridge(args: {
       }
       return outcome
     },
-    [agent, captureSendOrigin, clearDraftForSend, onSendError, restoreRejectedDraft, sendStructured]
+    [
+      agent,
+      sessionCommands,
+      captureSendOrigin,
+      clearDraftForSend,
+      onSendError,
+      restoreRejectedDraft,
+      sendStructured
+    ]
   )
   const send = useCallback(
     async (
diff --git a/mobile/src/session/use-mobile-structured-send-with-outcome.ts b/mobile/src/session/use-mobile-structured-send-with-outcome.ts
index 724acfb5c2e6..59086ba5fdbd 100644
--- a/mobile/src/session/use-mobile-structured-send-with-outcome.ts
+++ b/mobile/src/session/use-mobile-structured-send-with-outcome.ts
@@ -63,6 +63,7 @@ export function useMobileStructuredSendWithOutcome(args: {
     StructuredAgentSessionComposerOptions,
     'snapshot' | 'setOption' | 'invokeAction' | 'conversationCommands'
   >
+  sessionCommands?: StructuredAgentSessionComposerOptions['sessionCommands']
   onSendError: MobileNativeChatSendErrorReporter
   /** Each send carries the model and effort the picker shows; an older host takes neither. */
   carriesOptions?: boolean
@@ -85,6 +86,7 @@ export function useMobileStructuredSendWithOutcome(args: {
     queueCapable,
     carriesOptions,
     sessionId,
+    sessionCommands,
     stateRef,
     stopping
   } = args
@@ -117,7 +119,7 @@ export function useMobileStructuredSendWithOutcome(args: {
         sessionId,
         fence: currentFence,
         pending: commandPending,
-        controller: { agent: agent ?? undefined, ...controller },
+        controller: { agent: agent ?? undefined, ...controller, sessionCommands },
         busy: () =>
           actionableStructuredApproval(stateRef.current) ||
           actionableStructuredQuestion(stateRef.current)
@@ -196,6 +198,7 @@ export function useMobileStructuredSendWithOutcome(args: {
       queueCapable,
       carriesOptions,
       sessionId,
+      sessionCommands,
       stateRef,
       stopping
     ]
diff --git a/src/renderer/src/components/native-chat/use-native-chat-structured-composer-send.ts b/src/renderer/src/components/native-chat/use-native-chat-structured-composer-send.ts
index 9d065e6a923c..b9182788c2e7 100644
--- a/src/renderer/src/components/native-chat/use-native-chat-structured-composer-send.ts
+++ b/src/renderer/src/components/native-chat/use-native-chat-structured-composer-send.ts
@@ -38,7 +38,7 @@ function isNativeChatStructuredHostCommand(
   transport: NativeChatStructuredComposerTransport
 ): boolean {
   return (
-    isStructuredAgentSessionComposerCommand(text, agent) ||
+    isStructuredAgentSessionComposerCommand(text, agent, transport.sessionCommands) ||
     (transport.threadGoal !== undefined && isStructuredAgentSessionGoalCommand(text))
   )
 }
diff --git a/src/renderer/src/components/native-chat/use-native-chat-structured-composer-transport.ts b/src/renderer/src/components/native-chat/use-native-chat-structured-composer-transport.ts
index 05f783fb7030..959ba0eaac42 100644
--- a/src/renderer/src/components/native-chat/use-native-chat-structured-composer-transport.ts
+++ b/src/renderer/src/components/native-chat/use-native-chat-structured-composer-transport.ts
@@ -60,6 +60,7 @@ export function useNativeChatStructuredComposerTransport(args: {
       dispatchCommand: (text: string) =>
         dispatchStructuredAgentSessionComposerCommand(text, {
           agent: props.agent,
+          sessionCommands: controller.sessionCommands,
           snapshot: controller.optionSnapshot,
           invokeAction: async (id) => {
             setOptionPickerRequest({ id, consume: () => setOptionPickerRequest(null) })
diff --git a/src/shared/structured-agent-session-composer.test.ts b/src/shared/structured-agent-session-composer.test.ts
index aaaad68e3054..20c171b4f0af 100644
--- a/src/shared/structured-agent-session-composer.test.ts
+++ b/src/shared/structured-agent-session-composer.test.ts
@@ -105,13 +105,6 @@ describe('dispatchStructuredAgentSessionComposerCommand', () => {
     setOption: async () => true
   }
 
-  it('names what does work when a TUI-only command is typed', async () => {
-    const outcome = await dispatchStructuredAgentSessionComposerCommand('/vim', controller)
-    expect(outcome.handled).toBe(true)
-    expect(outcome.error).toBe(
-      '/vim is not available in chat sessions. Use the slash menu to see available commands.'
-    )
-  })
   it.each(['claude', 'codex'] as const)(
     'handles %s conversation commands without message fallthrough',
     async (agent) => {
@@ -152,6 +145,52 @@ describe('agent-implemented commands pass through to the agent', () => {
   }
   const PASSED_THROUGH = { handled: false, accepted: false, error: null }
 
+  it('passes an advertised OMP fast command to the native session', async () => {
+    expect(
+      await dispatchStructuredAgentSessionComposerCommand('/fast status', {
+        ...controller,
+        agent: 'omp',
+        sessionCommands: [{ name: 'fast', kind: 'command' }]
+      })
+    ).toEqual(PASSED_THROUGH)
+  })
+
+  it('does not infer native fast support from the OMP terminal catalog', async () => {
+    expect(
+      (
+        await dispatchStructuredAgentSessionComposerCommand('/fast', {
+          ...controller,
+          agent: 'omp',
+          sessionCommands: []
+        })
+      ).handled
+    ).toBe(true)
+  })
+
+  it('does not treat a skill named fast as native command support', async () => {
+    expect(
+      (
+        await dispatchStructuredAgentSessionComposerCommand('/fast', {
+          ...controller,
+          agent: 'omp',
+          sessionCommands: [{ name: 'fast', kind: 'skill' }]
+        })
+      ).handled
+    ).toBe(true)
+  })
+
+  it('keeps OMP terminal-only commands claimed when fast is advertised', async () => {
+    expect(
+      (
+        await dispatchStructuredAgentSessionComposerCommand('/git', {
+          ...controller,
+          agent: 'omp',
+          sessionCommands: [{ name: 'fast', kind: 'command' }]
+        })
+      ).handled
+    ).toBe(true)
+  })
+
   // Claude's harness runs a slash command it finds in the message text, so
   // claiming these answered "not available" for commands that do work.
   it.each(['init', 'review', 'help'] as const)(
diff --git a/src/shared/structured-agent-session-composer.ts b/src/shared/structured-agent-session-composer.ts
index 8ef8bff69a3a..0262db05280f 100644
--- a/src/shared/structured-agent-session-composer.ts
+++ b/src/shared/structured-agent-session-composer.ts
@@ -6,6 +6,7 @@ import type { AgentType } from './agent-status-types'
 import type { SessionOptionDescriptor, SessionOptionValue } from './native-chat-session-options'
 import type { SlashCommandSuggestion } from './native-chat-slash-commands'
 import type { AgentSessionConversationCommand } from './agent-session-conversation-command'
+import type { AgentSessionSlashCommand } from './agent-session-wire'
 
 const MODEL_COMMAND: SlashCommandSuggestion = {
   name: 'model',
@@ -30,6 +31,7 @@ export const STRUCTURED_AGENT_SESSION_SLASH_COMMANDS: readonly SlashCommandSugge
 
 export type StructuredAgentSessionComposerOptions = {
   agent?: AgentType
+  sessionCommands?: readonly AgentSessionSlashCommand[]
   snapshot: readonly SessionOptionDescriptor[]
   invokeAction: (id: string) => Promise<boolean>
   setOption: (id: string, value: SessionOptionValue) => Promise<boolean>
@@ -108,9 +110,18 @@ function structuredRecognizedCommands(agent: AgentType): readonly SlashCommandSu
  *  would be silently dropped, whereas a pass-through command is a real send. */
 export function isStructuredAgentSessionComposerCommand(
   text: string,
-  agent: AgentType = 'codex'
+  agent: AgentType = 'codex',
+  sessionCommands?: readonly AgentSessionSlashCommand[]
 ): boolean {
   const command = commandParts(text)
+  // OMP advertises this native ACP command; it is not a host option mutation.
+  if (
+    agent === 'omp' &&
+    command?.name === 'fast' &&
+    sessionCommands?.some((entry) => entry.name === 'fast' && entry.kind === 'command')
+  ) {
+    return false
+  }
   return Boolean(
     command && structuredRecognizedCommands(agent).some((entry) => entry.name === command.name)
   )
@@ -178,7 +189,10 @@ export async function dispatchStructuredAgentSessionComposerCommand(
       error: null
     }
   }
-  if (!command || !isStructuredAgentSessionComposerCommand(text, controller.agent)) {
+  if (
+    !command ||
+    !isStructuredAgentSessionComposerCommand(text, controller.agent, controller.sessionCommands)
+  ) {
     return { handled: false, accepted: false, error: null }
   }
   if (command.name === 'clear' || command.name === 'compact') {