different-ai/openwork · error

Disconnect MCP connection response was incomplete.

Error message

Disconnect MCP connection response was incomplete.

What it means

The disconnect MCP connection mutation assigns `result = connectionId` inside runReauthableAction after a successful disconnect fetch. If the callback never assigned (re-auth resolved without executing, or connectionId was falsy) this guard throws so the mutation can't resolve with undefined.

Source

Thrown at ee/apps/den-web/app/(den)/dashboard/_components/mcp-connections-data.tsx:945

export function useDisconnectMcpConnection() {
  const queryClient = useQueryClient();
  const { orgId, runReauthableAction } = useOrgDashboard();

  return useMutation({
    mutationFn: async (connectionId: string): Promise<string> => {
      let result: string | null = null;
      await runReauthableAction("disconnect-mcp-connection", async () => {
        const { response, payload } = await requestJson(
          `/v1/mcp-connections/${encodeURIComponent(connectionId)}/disconnect`,
          { method: "POST", headers: getOrgScopeHeaders(requireOrgId(orgId)) },
          15000,
        );
        if (!response.ok) {
          throw getRequestError(payload, response, `Failed to disconnect MCP connection (${response.status}).`);
        }
        result = connectionId;
      });
      if (!result) throw new Error("Disconnect MCP connection response was incomplete.");
      return result;
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: mcpConnectionQueryKeys.all });
    },
  });
}

export function useDeleteMcpConnection() {
  const queryClient = useQueryClient();
  const { orgId, runReauthableAction } = useOrgDashboard();

  return useMutation({
    mutationFn: async (connectionId: string): Promise<string> => {
      let result: string | null = null;
      await runReauthableAction("delete-mcp-connection", async () => {
        const { response, payload } = await requestJson(
          `/v1/mcp-connections/${encodeURIComponent(connectionId)}`,

View on GitHub (pinned to 2b7df46e8a)

Solutions

1. Ensure connectionId is a non-empty string before mutating
2. Verify runReauthableAction throws on dismissed re-auth rather than resolving undefined
3. Log inside the callback to confirm the disconnect fetch and assignment execute
4. Note the disconnect endpoint may return 2xx with empty body — the guard only checks the local variable, so confirm the callback reached `result = connectionId`

Example fix

// before
if (!result) throw new Error("Disconnect MCP connection response was incomplete.");
// after
if (!result) {
  throw new Error(`Disconnect MCP connection: no connectionId assigned (input=${JSON.stringify(connectionId)}).`);
}

if (typeof connectionId !== 'string' || connectionId.length === 0) {
  throw new Error('cannot disconnect: connectionId missing');
}

function isDisconnectInput(v: unknown): v is { connectionId: string } {
  return isRecord(v) && typeof v.connectionId === 'string' && v.connectionId.length > 0;
}

try {
  await disconnect.mutateAsync(connectionId);
} catch (e) {
  showToast({ variant: 'error', title: 'Disconnect failed', description: e instanceof Error ? e.message : String(e) });
  queryClient.invalidateQueries({ queryKey: mcpConnectionQueryKeys.all });
}

When it happens

Trigger: mutateAsync disconnect with an empty/undefined connectionId, or runReauthableAction resolving without running the callback because re-auth was dismissed or its contract changed.

Common situations: Disconnect clicked on a row whose connection was already removed server-side and locally refetched away; expired Den session with cancelled re-auth; refactor changed the wrapper's return behavior.

Understand the failure class

Background: "empty response", "returned no data", "empty embeddings": what HTTP 200-with-empty-body errors mean across libraries — this error's family across 36 libraries.

Related errors

• Update MCP connection response was incomplete.
• OAuth issuer review response was incomplete.
• Update connection access response was incomplete.
• Delete MCP connection response was incomplete.
• Failed to create the dashboard (${response.status}).

AI-assisted analysis of different-ai/openwork@2b7df46e8a (2026-09-01). Data as JSON: /api/errors/f1b6714e929f1f43. Report an issue: GitHub.