diff --git a/src/features/chat/application/composer/slash-commands.ts b/src/features/chat/application/composer/slash-commands.ts
index 002aa04a..4e17811a 100644
--- a/src/features/chat/application/composer/slash-commands.ts
+++ b/src/features/chat/application/composer/slash-commands.ts
@@ -172,11 +172,17 @@ export type SlashCommandName = SlashCommand extends `/${infer Name}` ? Name : ne
 
 export type SlashCommandDefinition = (typeof SLASH_COMMANDS)[number];
 
+const CONNECTION_INDEPENDENT_SLASH_COMMANDS = new Set<SlashCommandName>(["compact", "reconnect"]);
+
 export interface SlashCommandHelpSection {
   readonly title: string;
   readonly auditFacts: readonly { key: string; value: string }[];
 }
 
+export function slashCommandRequiresConnection(command: SlashCommandName): boolean {
+  return !CONNECTION_INDEPENDENT_SLASH_COMMANDS.has(command);
+}
+
 export function slashCommandDefinition(command: SlashCommandName): SlashCommandDefinition {
   const definition = SLASH_COMMANDS.find((item) => item.command === `/${command}`);
   if (!definition) throw new Error(`Unknown slash command: ${command}`);
diff --git a/src/features/chat/application/conversation/composer-submit-actions.ts b/src/features/chat/application/conversation/composer-submit-actions.ts
index 2efa37e1..8d628fe4 100644
--- a/src/features/chat/application/conversation/composer-submit-actions.ts
+++ b/src/features/chat/application/conversation/composer-submit-actions.ts
@@ -4,7 +4,7 @@ import { submissionStateSnapshot } from "../state/selectors";
 import type { ChatStateStore } from "../state/store";
 import { parseSlashCommand } from "../composer/suggestions";
 import type { SlashCommandExecutionResult } from "./slash-command-execution";
-import type { SlashCommandName } from "../composer/slash-commands";
+import { slashCommandRequiresConnection, type SlashCommandName } from "../composer/slash-commands";
 import type { ReferencedThreadMetadata } from "../../../../domain/threads/reference";
 
 const STATUS_INTERRUPT_REQUESTED = "Interrupt requested.";
@@ -54,7 +54,7 @@ async function sendMessage(host: ComposerSubmitActionsHost): Promise<void> {
 
   const slashCommand = parseSlashCommand(text);
   if (slashCommand) {
-    if (!(await host.connection.connectedClient())) return;
+    if (slashCommandRequiresConnection(slashCommand.command) && !(await host.connection.connectedClient())) return;
     host.composer.setDraft("", { clearSuggestions: true });
     const result = await host.slashCommandExecutor.execute(slashCommand.command, slashCommand.args);
     if (result?.composerDraft !== undefined) {
diff --git a/src/features/chat/application/conversation/slash-command-execution.ts b/src/features/chat/application/conversation/slash-command-execution.ts
index a69479b1..8ed5d0db 100644
--- a/src/features/chat/application/conversation/slash-command-execution.ts
+++ b/src/features/chat/application/conversation/slash-command-execution.ts
@@ -18,6 +18,7 @@ import {
   type SlashCommandSubcommandDefinition,
 } from "../composer/slash-commands";
 import type { MessageStreamAuditFact, MessageStreamNoticeSection } from "../../domain/message-stream/items";
+import { modelOverrideMessage, reasoningEffortOverrideMessage } from "../../presentation/runtime/messages";
 
 const DEFAULT_RUNTIME_SETTING_ALIASES = new Set(["default", "reset", "clear", "off"]);
 
@@ -92,16 +93,6 @@ function noActiveThreadToCompactMessage(): string {
   return "No active thread to compact.";
 }
 
-function modelOverrideMessage(model: string | null): string {
-  return model === null ? "Model reset to default for subsequent turns." : `Model set to ${model} for subsequent turns.`;
-}
-
-function reasoningEffortOverrideMessage(effort: ReasoningEffort | null): string {
-  return effort === null
-    ? "Reasoning effort reset to default for subsequent turns."
-    : `Reasoning effort set to ${effort} for subsequent turns.`;
-}
-
 export async function executeSlashCommand(
   command: SlashCommandName,
   args: string,
diff --git a/src/features/chat/application/runtime/settings-actions.ts b/src/features/chat/application/runtime/settings-actions.ts
index d3767f69..4991f682 100644
--- a/src/features/chat/application/runtime/settings-actions.ts
+++ b/src/features/chat/application/runtime/settings-actions.ts
@@ -12,6 +12,7 @@ import type { RuntimeSnapshot } from "../../domain/runtime/snapshot";
 import { nextCollaborationMode, type CollaborationModeSelection, type RequestedFastMode } from "../../domain/runtime/intent";
 import type { ChatAction, ChatState } from "../state/root-reducer";
 import type { ChatStateStore } from "../state/store";
+import { modelOverrideMessage, reasoningEffortOverrideMessage } from "../../presentation/runtime/messages";
 
 interface ApplyPendingThreadSettingsResult {
   ok: boolean;
@@ -183,16 +184,6 @@ async function setAutoReview(host: RuntimeSettingsActionsHost, mode: AutoReviewS
   host.addSystemMessage(autoReviewToggleMessage(mode));
 }
 
-export function modelOverrideMessage(model: string | null): string {
-  return model === null ? "Model reset to default for subsequent turns." : `Model set to ${model} for subsequent turns.`;
-}
-
-export function reasoningEffortOverrideMessage(effort: ReasoningEffort | null): string {
-  return effort === null
-    ? "Reasoning effort reset to default for subsequent turns."
-    : `Reasoning effort set to ${effort} for subsequent turns.`;
-}
-
 function fastModeToggleMessage(state: FastModeState): string {
   return state === "enabled" ? "Fast mode on for subsequent turns." : "Fast mode off for subsequent turns.";
 }
diff --git a/src/features/chat/presentation/runtime/messages.ts b/src/features/chat/presentation/runtime/messages.ts
index 316dd7fb..e156e41d 100644
--- a/src/features/chat/presentation/runtime/messages.ts
+++ b/src/features/chat/presentation/runtime/messages.ts
@@ -11,6 +11,16 @@ export function collaborationModeLabel(mode: CollaborationModeSelection): string
   return mode === "plan" ? "Plan" : "Default";
 }
 
+export function modelOverrideMessage(model: string | null): string {
+  return model === null ? "Model reset to default for subsequent turns." : `Model set to ${model} for subsequent turns.`;
+}
+
+export function reasoningEffortOverrideMessage(effort: ReasoningEffort | null): string {
+  return effort === null
+    ? "Reasoning effort reset to default for subsequent turns."
+    : `Reasoning effort set to ${effort} for subsequent turns.`;
+}
+
 export function pendingRuntimeSettingLabel(
   setting: { kind: "unchanged" } | { kind: "set"; value: unknown } | { kind: "resetToConfig" },
 ): string {
diff --git a/tests/features/chat/conversation/turns/composer-submit-actions.test.ts b/tests/features/chat/conversation/turns/composer-submit-actions.test.ts
index 425b1f88..79cb53fe 100644
--- a/tests/features/chat/conversation/turns/composer-submit-actions.test.ts
+++ b/tests/features/chat/conversation/turns/composer-submit-actions.test.ts
@@ -79,6 +79,37 @@ describe("submitComposer", () => {
     expect(sendTurnText).toHaveBeenCalledWith("hello", undefined, undefined);
   });
 
+  it("does not execute connection-dependent slash commands when connection fails", async () => {
+    const { host, connectedClient, execute, setDraft } = createHost("/clear");
+    connectedClient.mockResolvedValue(null);
+
+    await submitComposer(host);
+
+    expect(connectedClient).toHaveBeenCalledOnce();
+    expect(setDraft).not.toHaveBeenCalled();
+    expect(execute).not.toHaveBeenCalled();
+  });
+
+  it("executes reconnect without a connected client preflight", async () => {
+    const { host, connectedClient, execute, setDraft } = createHost("/reconnect");
+
+    await submitComposer(host);
+
+    expect(connectedClient).not.toHaveBeenCalled();
+    expect(setDraft).toHaveBeenCalledWith("", { clearSuggestions: true });
+    expect(execute).toHaveBeenCalledWith("reconnect", "");
+  });
+
+  it("executes compact without a connected client preflight", async () => {
+    const { host, connectedClient, execute, setDraft } = createHost("/compact");
+
+    await submitComposer(host);
+
+    expect(connectedClient).not.toHaveBeenCalled();
+    expect(setDraft).toHaveBeenCalledWith("", { clearSuggestions: true });
+    expect(execute).toHaveBeenCalledWith("compact", "");
+  });
+
   it("restores slash command composer drafts from command results", async () => {
     const { host, connectedClient, execute, sendTurnText, setDraft, showLatest } = createHost("/goal edit");
     execute.mockResolvedValue({ composerDraft: "/goal set Current objective" });
diff --git a/tests/runtime/runtime-settings.test.ts b/tests/runtime/runtime-settings.test.ts
index 94e724b0..2f9760b6 100644
--- a/tests/runtime/runtime-settings.test.ts
+++ b/tests/runtime/runtime-settings.test.ts
@@ -3,8 +3,11 @@ import { describe, expect, it } from "vitest";
 import { runtimeConfigSnapshotFromAppServerConfig, type ConfigReadResult } from "../../src/app-server/protocol/runtime-config";
 import type { RuntimeConfigSnapshot } from "../../src/domain/runtime/config";
 import type { ModelMetadata } from "../../src/domain/catalog/metadata";
-import { modelOverrideMessage, reasoningEffortOverrideMessage } from "../../src/features/chat/application/runtime/settings-actions";
-import { compactReasoningEffortLabel } from "../../src/features/chat/presentation/runtime/messages";
+import {
+  compactReasoningEffortLabel,
+  modelOverrideMessage,
+  reasoningEffortOverrideMessage,
+} from "../../src/features/chat/presentation/runtime/messages";
 import {
   autoReviewActive,
   currentModel,