Inspect Log Viewer

React app for viewing eval logs produced by Inspect AI. It runs standalone (served by inspect view), against statically hosted log directories, inside the Inspect VS Code extension, and can be embedded in external applications via the @meridianlabs/log-viewer npm package.

For repo setup (corepack, pnpm, install), see the root README.

Development

Run commands from this directory, or from the repo root with pnpm <command> --filter=@meridianlabs/log-viewer (the root scripts pass the filter through to turbo run, preserving task dependencies — see scripts.md):

Command	Description
pnpm dev	Start the Vite dev server on :5173
pnpm build	Build the bundled app
pnpm build:lib	Build the embeddable library into lib/
pnpm test	Run unit/integration tests (vitest)
pnpm e2e	Run Playwright e2e tests
pnpm check-all	Type check, lint, format, test, and build

Built output is not committed; the library is built at publish time (prepublishOnly).

You may optionally set the VIEW_SERVER_API_URL environment variable at build time to use an API server running on a different host.

Embedding (@meridianlabs/log-viewer)

Versioning disclaimer: this package does NOT use semantic versioning. The public surface evolves with the host application's needs — expect breaking changes in any release and adapt accordingly.

npm install @meridianlabs/log-viewer

The viewer requires its bundled CSS:

import "@meridianlabs/log-viewer/styles/index.css";

Example Usage

An embedder installs a per-dir API factory with setApiFactory before initializing the store and rendering <App />. The viewer resolves the log directory (from initialLogDir or a ?log_dir= URL param), calls your factory with it, and renders:

import {
    App,
    clientApi,
    createViewServerApi,
    initializeStore,
    setApiFactory,
} from "@meridianlabs/log-viewer";
import type { Capabilities } from "@meridianlabs/log-viewer";

import "@meridianlabs/log-viewer/styles/index.css";

// Install the API factory first — installing after the backend has
// resolved throws.
setApiFactory(
    (logDir) =>
        clientApi(
            createViewServerApi({
                logDir,
                // Optional transport options: apiBaseUrl, headerProvider, customFetch
                apiBaseUrl: "https://mycompany.com/api",
            })
        ),
    "s3://my-bucket/logs" // initialLogDir; omit to require ?log_dir= in the URL
);

const capabilities: Capabilities = {
    downloadFiles: true,
    downloadLogs: false,
    webWorkers: true,
    streamSamples: false,
};
initializeStore(capabilities);

export function MyApp() {
    return <App />;
}

To re-point the viewer at a different log directory after boot, call setLogRoot(dir) — it rebuilds the API through the same factory.

Embedder chrome

If your own UI (rendered as a sibling of <App />, not a descendant) calls the viewer's selection hooks (useSelectedSampleSummary, useSelectedScores, useLogSelection), wrap that chrome in <InspectQueryClientProvider> so the hooks resolve the viewer's react-query client, and gate it on useViewerReady() — the hooks throw before the viewer's app config resolves.

See src/index.ts for the full public surface.