Share vault reference providers across chat panels

src/features/chat/host/obsidian/vault-composer-context-reference-provider.obsidian.ts

@@ -13,6 +13,42 @@ interface EventSource {
 }
 
 export class VaultComposerContextReferenceProvider implements ComposerContextReferenceProvider {
+  private readonly shared: SharedComposerContext;
+  private disposed = false;
+
+  constructor(private readonly app: App) {
+    const existing = sharedComposerContexts.get(app);
+    if (existing) {
+      existing.consumers += 1;
+      this.shared = existing;
+      return;
+    }
+    this.shared = { tracker: new VaultComposerContextTracker(app), consumers: 1 };
+    sharedComposerContexts.set(app, this.shared);
+  }
+
+  contextReferences(sourcePath: string): ComposerContextReferences {
+    return this.shared.tracker.contextReferences(sourcePath);
+  }
+
+  dispose(): void {
+    if (this.disposed) return;
+    this.disposed = true;
+    this.shared.consumers -= 1;
+    if (this.shared.consumers > 0) return;
+    this.shared.tracker.dispose();
+    sharedComposerContexts.delete(this.app);
+  }
+}
+
+interface SharedComposerContext {
+  readonly tracker: VaultComposerContextTracker;
+  consumers: number;
+}
+
+const sharedComposerContexts = new WeakMap<App, SharedComposerContext>();
+
+class VaultComposerContextTracker {
   private readonly unregisterEvents: (() => void)[] = [];
   private lastMarkdownView: MarkdownView | null = null;
 

src/features/chat/host/obsidian/vault-note-candidate-provider.obsidian.ts

@@ -22,7 +22,51 @@ interface MetadataCacheWithTags {
   getTags?: () => unknown;
 }
 
+interface SharedCandidateCatalog {
+  readonly catalog: VaultNoteCandidateCatalog;
+  consumers: number;
+}
+
+const candidateCatalogs = new WeakMap<App, SharedCandidateCatalog>();
+
 export class VaultNoteCandidateProvider implements NoteCandidateProvider {
+  private readonly shared: SharedCandidateCatalog;
+  private disposed = false;
+
+  constructor(private readonly app: App) {
+    const existing = candidateCatalogs.get(app);
+    if (existing) {
+      existing.consumers += 1;
+      this.shared = existing;
+      return;
+    }
+    this.shared = { catalog: new VaultNoteCandidateCatalog(app), consumers: 1 };
+    candidateCatalogs.set(app, this.shared);
+  }
+
+  candidates(sourcePath: string): readonly NoteCandidate[] {
+    return this.shared.catalog.candidates(sourcePath);
+  }
+
+  tags(): readonly string[] {
+    return this.shared.catalog.tags();
+  }
+
+  resolveMention(target: string, sourcePath: string): WikiLinkMention | null {
+    return this.shared.catalog.resolveMention(target, sourcePath);
+  }
+
+  dispose(): void {
+    if (this.disposed) return;
+    this.disposed = true;
+    this.shared.consumers -= 1;
+    if (this.shared.consumers > 0) return;
+    this.shared.catalog.dispose();
+    candidateCatalogs.delete(this.app);
+  }
+}
+
+class VaultNoteCandidateCatalog {
   private readonly unregisterEvents: (() => void)[] = [];
   private fileCandidatesCache: FileCandidate[] | null = null;
   private tagCandidatesCache: string[] | null = null;

tests/features/chat/host/vault-note-candidate-provider.test.ts

@@ -147,6 +147,23 @@ describe("VaultNoteCandidateProvider", () => {
     expect(app.offref).toHaveBeenCalledTimes(6);
   });
 
+  it("shares candidate caches and event subscriptions across panel providers", () => {
+    const getFiles = vi.fn(() => vaultFiles([{ basename: "Alpha", path: "Alpha.md", stat: { mtime: 1 } }]));
+    const app = appFixture({ getFiles });
+    const first = new VaultNoteCandidateProvider(app);
+    const second = new VaultNoteCandidateProvider(app);
+
+    first.candidates("Inbox.md");
+    second.candidates("Inbox.md");
+    first.dispose();
+
+    expect(getFiles).toHaveBeenCalledOnce();
+    expect(app.offref).not.toHaveBeenCalled();
+
+    second.dispose();
+    expect(app.offref).toHaveBeenCalledTimes(6);
+  });
+
   it("resolves wikilinks through metadata cache before direct path fallback", () => {
     const linked = tFile("notes/Alpha.md", "Alpha");
     const direct = tFile("Alpha.md", "Alpha direct");
@@ -218,6 +235,18 @@ describe("VaultNoteCandidateProvider", () => {
       },
     });
   });
+
+  it("shares active-view event tracking across panel context providers", () => {
+    const app = appFixture();
+    const first = new VaultComposerContextReferenceProvider(app);
+    const second = new VaultComposerContextReferenceProvider(app);
+
+    first.dispose();
+    expect(app.offref).not.toHaveBeenCalled();
+
+    second.dispose();
+    expect(app.offref).toHaveBeenCalledTimes(2);
+  });
 });
 
 interface AppFixture extends App {