inspector/core/react/useManagedResourceTemplates.ts
cliffhall f201032137 fix: surface list-fetch failures instead of swallowing them
A list load that failed — a transport error, or a result the SDK's era
codec rejects as invalid — reported nothing. The connect-time refresh is
fired with no caller to await it (`void this.refresh()`), so its rejection
became an unhandled rejection: the header said "Connected", the panel
rendered an empty list indistinguishable from a server that has none, and
the failed exchange showed in the Protocol panel as a clean success.

Two surfaces now tell the truth:

- ManagedListState records the failure as observable state (`getError` +
  an `errorChange` event) and still re-throws, so App's auth-recovery
  wrapper keeps working. The four `useManaged*` hooks expose it via a
  shared `useManagedListError`, and the Tools/Prompts/Resources sidebars
  render a `ListLoadError` alert with the reason and a Retry.
- A response the client refused is attributed back to its Protocol entry
  (`markResponseRejected` → `responseRejected` → `MessageEntry.clientError`),
  which now renders an Error status and a "Rejected by the Inspector"
  alert rather than the green resultType badge alone. The SDK gives no
  request id with a decode failure, so the id is recovered by correlation;
  see the comment on `markResponseRejected` for why that is exact.

Also stops `listAllTools` from dropping a failing excluded-tools walk on
the floor — it stays non-fatal but is logged.

Closes #1953

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SW1p8E2uiyyLx4RKwrwSrt
2026-08-08 16:48:48 -04:00

76 lines
2.7 KiB
TypeScript

import { useState, useEffect, useCallback } from "react";
import type { InspectorClientProtocol } from "../mcp/inspectorClientProtocol.js";
import type {
ManagedResourceTemplatesState,
ManagedResourceTemplatesStateEventMap,
} from "../mcp/state/managedResourceTemplatesState.js";
import type { ResourceTemplateType as ResourceTemplate } from "@modelcontextprotocol/client";
import type { TypedEventGeneric } from "../mcp/typedEventTarget.js";
import { useManagedListError } from "./useManagedListError.js";
export interface UseManagedResourceTemplatesResult {
/**
* The last fetch's failure (transport error, or a result the SDK codec
* rejected), or `null` when it succeeded. Includes the connect-time load,
* whose failure has no caller to surface it (#1953).
*/
error: Error | null;
resourceTemplates: ResourceTemplate[];
refresh: () => Promise<ResourceTemplate[]>;
}
/**
* React hook that subscribes to ManagedResourceTemplatesState and returns
* resource templates + refresh.
*/
export function useManagedResourceTemplates(
client: InspectorClientProtocol | null,
managedResourceTemplatesState: ManagedResourceTemplatesState | null,
): UseManagedResourceTemplatesResult {
const [resourceTemplates, setResourceTemplates] = useState<
ResourceTemplate[]
>(managedResourceTemplatesState?.getResourceTemplates() ?? []);
useEffect(() => {
if (!managedResourceTemplatesState) {
setResourceTemplates([]);
return;
}
setResourceTemplates(managedResourceTemplatesState.getResourceTemplates());
const onResourceTemplatesChange = (
event: TypedEventGeneric<
ManagedResourceTemplatesStateEventMap,
"resourceTemplatesChange"
>,
) => {
setResourceTemplates(event.detail);
};
managedResourceTemplatesState.addEventListener(
"resourceTemplatesChange",
onResourceTemplatesChange,
);
return () => {
managedResourceTemplatesState.removeEventListener(
"resourceTemplatesChange",
onResourceTemplatesChange,
);
};
}, [managedResourceTemplatesState]);
const error = useManagedListError(managedResourceTemplatesState);
const refresh = useCallback(async (): Promise<ResourceTemplate[]> => {
if (!managedResourceTemplatesState || !client) return [];
// A user-initiated refresh forces a cache-bypassing round trip
// (`cacheMode: "refresh"`) so a modern server's `ttlMs`-cached list can't
// return stale — and re-stores the fresh aggregate.
const next = await managedResourceTemplatesState.refresh(
undefined,
"refresh",
);
setResourceTemplates(next);
return next;
}, [client, managedResourceTemplatesState]);
return { resourceTemplates, error, refresh };
}