Maintenant

This release fixes two distinct bugs that broke the Claude MCP OAuth connection flow, each surfacing the same confusing symptom: a blank SPA screen instead of the authorization prompt. After this release, connecting Claude (web, Desktop, or Code) to a maintenant MCP server works without hard reloads or manual config workarounds.

Fixes

• Service worker no longer shadows backend OAuth routes. The PWA service worker served the precached app shell for navigations to /oauth/authorize, so Claude's OAuth redirect was intercepted and rendered a blank SPA screen until a hard reload bypassed the worker. /oauth/, /.well-known/, and /mcp are now added to navigateFallbackDenylist, so the service worker never shadows backend-served routes. autoUpdate plus skipWaiting/clientsClaim roll the fix out to existing clients on their next visit ? no manual cache clear needed.

• redirect_uri is now matched exactly, not by origin. The authorize endpoint compared only the redirect_uri origin (scheme://host), but the docs instruct configuring the full callback URI. A configured value like https://claude.ai/api/mcp/auth_callback never matched, so authorization failed with invalid redirect_uri ? which also surfaced as a blank SPA screen when the proxy served index.html on the 400 response. The endpoint now compares the full redirect_uri with simple string comparison (RFC 6749 �3.1.2.3). Loopback callbacks (localhost / 127.0.0.1 / ::1, any port or path) stay always-allowed for local clients, so Claude Desktop and Claude Code keep working out of the box.

Tests

• First OAuth test suite added (internal/mcp/oauth/server_test.go) covering exact-match acceptance, origin-only rejection, and loopback allow-listing.

Upgrade notes

1. No new environment variables and no migration. The fixes are picked up automatically: the frontend fix ships in the new build, and the service worker updates itself on the next visit.
2. If you had previously worked around the redirect_uri mismatch by listing the origin (https://claude.ai) in MAINTENANT_MCP_ALLOWED_REDIRECT_URIS, change it to the full callback URI (https://claude.ai/api/mcp/auth_callback). Loopback callbacks no longer need to be listed at all.

Documentation

• Updated: MCP ? clarifies exact full-URI matching and automatic loopback acceptance for MAINTENANT_MCP_ALLOWED_REDIRECT_URIS.