@copilotkit/core

@copilotkit/core

@copilotkit/core is the framework-neutral client for CopilotKit runtimes. It manages runtime agents, frontend tools, shared context, suggestions, thread stores, and subscriptions.

Trusted Inspector metadata

When the connected runtime reports inspectorMetadata: true in its runtime-info response, Core loads the optional InspectorMetadataV1 value in the background. The runtime connection and agent notifications finish first, so a slow or unavailable metadata route cannot delay the app.

Core exposes the object returned by Shared normalization unchanged through the getter and subscriber event. Older runtimes may omit usage.expiringSoonCount; that absence remains valid V1 usage. A value of 0 means known zero and stays different from absence. Shared omits a malformed expiry leaf without removing valid used, limit, or sibling modules. Core does not calculate or rebuild expiry and does not require a V2 schema.

Read the latest value with inspectorMetadata, refresh it without reconnecting, or subscribe to changes:

import { CopilotKitCore } from "@copilotkit/core";

const copilotkit = new CopilotKitCore({
  runtimeUrl: "/api/copilotkit",
  headers: { Authorization: "Bearer app-session" },
  credentials: "include",
});

const subscription = copilotkit.subscribe({
  onInspectorMetadataChanged: ({ inspectorMetadata }) => {
    console.log(inspectorMetadata);
  },
});

await copilotkit.refreshInspectorMetadata();
console.log(copilotkit.inspectorMetadata);

subscription.unsubscribe();

Core sends the current headers and fetch credentials to the Copilot Runtime. A call to setHeaders() or setCredentials() clears the prior value before it starts a new metadata refresh, so trusted context cannot cross an auth-context change. Changing the runtime URL or transport, losing the capability, or disconnecting also clears the value.

Each refresh cancels the prior request and has a five-second deadline. Core also checks the runtime URL, requested and resolved transport, headers, credentials, connection, and capability before publishing a response. A stale success or failure cannot replace metadata from a newer connection. Route, timeout, parse, and subscriber failures stay isolated from the runtime connection.

See the CopilotKitCore reference and CopilotKitCoreSubscriber reference for the full API.