diff --git a/src/index.ts b/src/index.ts
index fd45543..7d53086 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,13 @@
+import { CloseCursor, ReadCursor, RunQuery } from "./query";
+import { Schemas } from "./schema";
+
+export const InterfaceDeclarations = {
+  CloseCursor,
+  ReadCursor,
+  RunQuery,
+  Schemas,
+};
+
 export { Datum } from "./datum";
 export { Query } from "./query";
 export {
@@ -6,6 +16,7 @@ export {
   Schema,
   SchemaDefinition,
   SchemaInstance,
+  Schemas,
 } from "./schema";
 export { Selection, SingleSelection, Table } from "./selection";
 export { Stream } from "./stream";
diff --git a/src/tests/root-declarations.test.ts b/src/tests/root-declarations.test.ts
new file mode 100644
index 0000000..58af89b
--- /dev/null
+++ b/src/tests/root-declarations.test.ts
@@ -0,0 +1,55 @@
+import { execFileSync } from "node:child_process";
+import path from "node:path";
+import { expect } from "chai";
+import * as declarations from "..";
+import * as query from "../query";
+import * as schema from "../schema";
+
+const packageRoot = path.resolve(__dirname, "../..");
+const declarationKeys = ["CloseCursor", "ReadCursor", "RunQuery", "Schemas"];
+
+function verifyImportOrder(firstEntry: string, secondEntry: string) {
+  const source = `
+    const assert = require("node:assert/strict");
+    const path = require("node:path");
+    const packageRoot = ${JSON.stringify(packageRoot)};
+    const first = require(path.join(packageRoot, ${JSON.stringify(firstEntry)}));
+    const second = require(path.join(packageRoot, ${JSON.stringify(secondEntry)}));
+    const root = ${JSON.stringify(firstEntry)} === "dist/index.js" ? first : second;
+    const query = require(path.join(packageRoot, "dist/query.js"));
+    const schema = require(path.join(packageRoot, "dist/schema.js"));
+    assert.deepStrictEqual(Object.keys(root.InterfaceDeclarations).sort(), ${JSON.stringify(declarationKeys.sort())});
+    assert.strictEqual(root.InterfaceDeclarations.CloseCursor, query.CloseCursor);
+    assert.strictEqual(root.InterfaceDeclarations.ReadCursor, query.ReadCursor);
+    assert.strictEqual(root.InterfaceDeclarations.RunQuery, query.RunQuery);
+    assert.strictEqual(root.InterfaceDeclarations.Schemas, schema.Schemas);
+    assert.strictEqual(root.Schemas, schema.Schemas);
+  `;
+  execFileSync(process.execPath, ["-e", source]);
+}
+
+describe("root interface declarations", () => {
+  it("exports every canonical provider declaration", () => {
+    expect(
+      Object.keys(declarations.InterfaceDeclarations).sort(),
+    ).to.deep.equal(declarationKeys.sort());
+    expect(declarations.InterfaceDeclarations.CloseCursor).to.equal(
+      query.CloseCursor,
+    );
+    expect(declarations.InterfaceDeclarations.ReadCursor).to.equal(
+      query.ReadCursor,
+    );
+    expect(declarations.InterfaceDeclarations.RunQuery).to.equal(
+      query.RunQuery,
+    );
+    expect(declarations.InterfaceDeclarations.Schemas).to.equal(schema.Schemas);
+    expect(declarations.Schemas).to.equal(schema.Schemas);
+  });
+
+  it("keeps canonical declarations in both import orders", () => {
+    verifyImportOrder("dist/index.js", "dist/schema.js");
+    verifyImportOrder("dist/schema.js", "dist/index.js");
+    verifyImportOrder("dist/index.js", "dist/query.js");
+    verifyImportOrder("dist/query.js", "dist/index.js");
+  });
+});