LibreChat/client
Dustin Healy ea75afc99a fix(mcp): harden MCP Apps host security and CJS compatibility
Reimplement the MCP Apps ui-meta helpers (RESOURCE_MIME_TYPE, getToolUiResourceUri,
isToolVisibilityModelOnly, isToolVisibilityAppOnly) in packages/api/src/mcp/apps.ts so
@librechat/api no longer imports the ESM-only @modelcontextprotocol/ext-apps from its CommonJS
build. ext-apps remains a client-only dependency, removing the require(ESM) boundary that throws
ERR_REQUIRE_ESM on Node versions without synchronous require(esm) support.

Add an mcpSettings.apps toggle (enabled unless explicitly false). Thread enableApps through
connection creation so the io.modelcontextprotocol/ui capability is advertised only when apps are
enabled, and gate the resource and app-tool-call routes with a requireMCPAppsEnabled middleware.

Authorize app-driven resources/read against the resources and templates a server advertises, so a
sandboxed app cannot proxy arbitrary uris. ui:// resources stay allowed and the check fails closed.

Render MCP apps in shared and search transcripts display-only by withholding the host-bound bridge
handlers and capabilities in read-only views, so an embedded app cannot call tools or read
resources with the viewer's auth while the stored tool result still renders.
2026-06-28 21:56:28 -07:00
..
public chore(mcp): loosen csp safety so threejs mcp apps official demo server can run 2026-06-25 22:56:54 -07:00
scripts
src fix(mcp): harden MCP Apps host security and CJS compatibility 2026-06-28 21:56:28 -07:00
sw 🛟 fix: Auto-Recover from Stale Service Worker Assets After Deploys (#13686) 2026-06-11 11:57:06 -04:00
test
babel.config.cjs
check_updates.sh
index.html 🛟 fix: Auto-Recover from Stale Service Worker Assets After Deploys (#13686) 2026-06-11 11:57:06 -04:00
jest.config.cjs feat: MCP Apps support (squashed for rebase) 2026-06-21 23:55:17 -07:00
nginx.conf
package.json refactor: replace @mcp-ui/client with @modelcontextprotocol/ext-apps/app-bridge 2026-06-23 13:55:56 -07:00
postcss.config.cjs
tailwind.config.cjs
tsconfig.json 👷 ci: Type-check the Client Workspace (#13560) 2026-06-06 18:40:31 -04:00
vite.config.ts 🛟 fix: Auto-Recover from Stale Service Worker Assets After Deploys (#13686) 2026-06-11 11:57:06 -04:00