diff --git a/src/app-server/request-input.ts b/src/app-server/request-input.ts
new file mode 100644
index 00000000..e264580b
--- /dev/null
+++ b/src/app-server/request-input.ts
@@ -0,0 +1,26 @@
+import type { UserInput } from "../generated/app-server/v2/UserInput";
+
+export interface AppServerRequestMention {
+  name: string;
+  path: string;
+}
+
+export function appServerTextInputWithMentions(
+  text: string,
+  mentions: readonly AppServerRequestMention[],
+  skills: readonly AppServerRequestMention[] = [],
+): UserInput[] {
+  return [
+    ...appServerTextInput(text),
+    ...mentions.map((mention) => ({ type: "mention" as const, name: mention.name, path: mention.path })),
+    ...skills.map((skill) => ({ type: "skill" as const, name: skill.name, path: skill.path })),
+  ];
+}
+
+export function appServerTextInputWithAttachments(text: string, input: readonly UserInput[]): UserInput[] {
+  return [...appServerTextInput(text), ...input.filter((item) => item.type !== "text")];
+}
+
+function appServerTextInput(text: string): UserInput[] {
+  return [{ type: "text", text, text_elements: [] }];
+}
diff --git a/src/domain/threads/reference.ts b/src/domain/threads/reference.ts
index 28d2bbd1..2d16d579 100644
--- a/src/domain/threads/reference.ts
+++ b/src/domain/threads/reference.ts
@@ -1,4 +1,3 @@
-import type { UserInput } from "../../generated/app-server/v2/UserInput";
 import { shortThreadId } from "../../utils";
 import { getThreadTitle, type Thread } from "./model";
 import type { ThreadConversationSummary } from "./transcript";
@@ -23,8 +22,8 @@ export interface ReferencedThreadTurn {
   assistantText: string | null;
 }
 
-export interface ReferencedThreadInput {
-  input: UserInput[];
+export interface ReferencedThreadPromptBundle {
+  prompt: string;
   referencedThread: ReferencedThreadDisplay;
   status: string;
 }
@@ -69,15 +68,14 @@ function referencedThreadDisplay(thread: Thread, count: number): ReferencedThrea
   };
 }
 
-export function referencedThreadInput(
+export function referencedThreadPromptBundle(
   thread: Thread,
   turns: readonly ReferencedThreadTurn[],
   userRequest: string,
-  messageInput: UserInput[],
-): ReferencedThreadInput {
+): ReferencedThreadPromptBundle {
   const prompt = referencedThreadPrompt(thread, [...turns], userRequest);
   return {
-    input: [{ type: "text", text: prompt, text_elements: [] }, ...messageInput.filter((item) => item.type !== "text")],
+    prompt,
     referencedThread: referencedThreadDisplay(thread, turns.length),
     status: referencedThreadStatus(thread, turns.length),
   };
diff --git a/src/features/chat/composer/wikilink-context.ts b/src/features/chat/composer/wikilink-context.ts
index 4c6782dc..52e9278e 100644
--- a/src/features/chat/composer/wikilink-context.ts
+++ b/src/features/chat/composer/wikilink-context.ts
@@ -1,4 +1,4 @@
-import type { UserInput } from "../../../generated/app-server/v2/UserInput";
+import { appServerTextInputWithMentions, type AppServerRequestMention } from "../../../app-server/request-input";
 import type { SkillMetadata } from "../../../domain/catalog/metadata";
 import { parseObsidianWikiLink } from "../../../shared/obsidian/wikilinks";
 
@@ -31,7 +31,7 @@ export function parsedWikiLinks(text: string): ParsedWikiLink[] {
   return links;
 }
 
-export function userInputWithWikiLinkMentions(text: string, resolveMention: WikiLinkMentionResolver): UserInput[] {
+export function userInputWithWikiLinkMentions(text: string, resolveMention: WikiLinkMentionResolver) {
   return userInputWithWikiLinkMentionsAndSkills(text, resolveMention, []);
 }
 
@@ -39,27 +39,28 @@ export function userInputWithWikiLinkMentionsAndSkills(
   text: string,
   resolveMention: WikiLinkMentionResolver,
   skills: readonly SkillMetadata[],
-): UserInput[] {
-  const input: UserInput[] = [{ type: "text", text, text_elements: [] }];
+) {
+  const mentions: AppServerRequestMention[] = [];
   const seenPaths = new Set<string>();
 
   for (const link of parsedWikiLinks(text)) {
     const mention = resolveMention(link.target);
     if (!mention || seenPaths.has(mention.path)) continue;
     seenPaths.add(mention.path);
-    input.push({ type: "mention", name: mention.name, path: mention.path });
+    mentions.push(mention);
   }
 
   const skillByName = firstEnabledSkillByName(skills);
+  const resolvedSkills: AppServerRequestMention[] = [];
   const seenSkillPaths = new Set<string>();
   for (const reference of parsedSkillReferences(text)) {
     const skill = skillByName.get(reference.toLowerCase());
     if (!skill || seenSkillPaths.has(skill.path)) continue;
     seenSkillPaths.add(skill.path);
-    input.push({ type: "skill", name: skill.name, path: skill.path });
+    resolvedSkills.push({ name: skill.name, path: skill.path });
   }
 
-  return input;
+  return appServerTextInputWithMentions(text, mentions, resolvedSkills);
 }
 
 export function parsedSkillReferences(text: string): string[] {
diff --git a/src/features/chat/turns/slash-command-actions.ts b/src/features/chat/turns/slash-command-actions.ts
index 3a4ed3e9..7a0221f3 100644
--- a/src/features/chat/turns/slash-command-actions.ts
+++ b/src/features/chat/turns/slash-command-actions.ts
@@ -1,10 +1,7 @@
 import type { AppServerClient } from "../../../app-server/client";
+import { appServerTextInputWithAttachments } from "../../../app-server/request-input";
 import { chronologicalConversationSummariesFromAppServerTurns } from "../../../app-server/turn-model";
-import {
-  referencedThreadInput as buildReferencedThreadInput,
-  referencedThreadTurns,
-  REFERENCED_THREAD_TURN_LIMIT,
-} from "../../../domain/threads/reference";
+import { referencedThreadPromptBundle, referencedThreadTurns, REFERENCED_THREAD_TURN_LIMIT } from "../../../domain/threads/reference";
 import type { Thread } from "../../../domain/threads/model";
 import {
   executeSlashCommand as runSlashCommand,
@@ -139,9 +136,13 @@ async function referencedThreadInput(
       host.status.addSystemMessage("Referenced thread has no readable conversation turns.");
       return null;
     }
-    const reference = buildReferencedThreadInput(thread, turns, message, host.codexInput(message));
+    const reference = referencedThreadPromptBundle(thread, turns, message);
+    const messageInput = host.codexInput(message);
     host.status.setStatus(reference.status);
-    return reference;
+    return {
+      input: appServerTextInputWithAttachments(reference.prompt, messageInput),
+      referencedThread: reference.referencedThread,
+    };
   } catch (error) {
     host.status.addSystemMessage(error instanceof Error ? error.message : String(error));
     return null;
diff --git a/tests/app-server/request-input.test.ts b/tests/app-server/request-input.test.ts
new file mode 100644
index 00000000..bb49a54f
--- /dev/null
+++ b/tests/app-server/request-input.test.ts
@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+
+import { appServerTextInputWithAttachments, appServerTextInputWithMentions } from "../../src/app-server/request-input";
+import type { UserInput } from "../../src/generated/app-server/v2/UserInput";
+
+describe("app-server request input", () => {
+  it("builds text input with mentions and skills", () => {
+    expect(
+      appServerTextInputWithMentions(
+        "Use [[Note]] and $Skill",
+        [{ name: "Note", path: "Note.md" }],
+        [{ name: "Skill", path: ".codex/skills/skill/SKILL.md" }],
+      ),
+    ).toEqual([
+      { type: "text", text: "Use [[Note]] and $Skill", text_elements: [] },
+      { type: "mention", name: "Note", path: "Note.md" },
+      { type: "skill", name: "Skill", path: ".codex/skills/skill/SKILL.md" },
+    ]);
+  });
+
+  it("replaces text input while preserving non-text attachments", () => {
+    const input: UserInput[] = [
+      { type: "text", text: "visible request", text_elements: [] },
+      { type: "mention", name: "Note", path: "Note.md" },
+    ];
+
+    expect(appServerTextInputWithAttachments("rewritten prompt", input)).toEqual([
+      { type: "text", text: "rewritten prompt", text_elements: [] },
+      { type: "mention", name: "Note", path: "Note.md" },
+    ]);
+  });
+});
diff --git a/tests/domain/threads/reference.test.ts b/tests/domain/threads/reference.test.ts
index 40e312d8..54cacd79 100644
--- a/tests/domain/threads/reference.test.ts
+++ b/tests/domain/threads/reference.test.ts
@@ -3,7 +3,7 @@ import { describe, expect, it } from "vitest";
 import type { Thread } from "../../../src/domain/threads/model";
 import {
   referencedThreadDisplayFromPrompt,
-  referencedThreadInput,
+  referencedThreadPromptBundle,
   referencedThreadPrompt,
   referencedThreadTurns,
 } from "../../../src/domain/threads/reference";
@@ -117,16 +117,12 @@ describe("thread reference context", () => {
     ).toBeNull();
   });
 
-  it("builds slash command input while preserving non-text attachments", () => {
+  it("builds a prompt bundle for slash command references", () => {
     const source = thread();
-    const input = referencedThreadInput(source, [{ userText: "元の依頼", assistantText: "回答" }], "この続きです", [
-      { type: "text", text: "この続きです", text_elements: [] },
-      { type: "mention", name: "Note", path: "Note.md" },
-    ]);
+    const input = referencedThreadPromptBundle(source, [{ userText: "元の依頼", assistantText: "回答" }], "この続きです");
 
     expect(input.status).toBe("Referencing 019abcde (1/20 turns).");
     expect(input.referencedThread).toMatchObject({ threadId: source.id, title: "参照元", includedTurns: 1 });
-    expect(input.input[0]).toMatchObject({ type: "text" });
-    expect(input.input[1]).toEqual({ type: "mention", name: "Note", path: "Note.md" });
+    expect(input.prompt).toContain("Current user request:\nこの続きです");
   });
 });