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Resolves the walk-away failure mode where MCP tool calls using OBO auth fail with "No valid OpenID access token is available for OBO exchange" after a user idles past their access-token lifetime. The strategy-time snapshot on `user.federatedTokens` could expire mid-stream before `resolveOboToken` ran, while `req.session.openidTokens` carried a still- valid (or refreshable) token that nothing read. - New OpenIDSessionRefresh service: per-user single-flighted closure that reads `req.session.openidTokens` at OBO time and inline-refreshes via `openid-client.refreshTokenGrant` when expired (30s skew), persisting via `req.session.save()`. No cookie writes (headers already flushed). - `resolveOboToken` gains a required UpstreamTokenProvider parameter (typed as `() => Promise<OIDCTokens | null>`, reusing the shared shape from @librechat/data-schemas). Compile-time guarantee that every call site is updated. - New `session_refresh_failed` OboTokenResolutionReason distinguishes "session expired and IdP rejected refresh" from "no upstream token ever existed." - `req` threaded through createMCPTool/createMCPTools/createToolInstance to construct the closure with captured request, plus fail-closed guards in MCPConnectionFactory.getOboTokens and MCPManager.callTool when the closure isn't plumbed. - Startup warning in MCPServersInitializer when OBO is configured but OPENID_REUSE_TOKENS is unset (the strategy populating user.federatedTokens is only registered under reuse, so OBO would fail every call without it). Tests: 16 new in OpenIDSessionRefresh.spec.js; obo.spec.ts extended for the new param + error reason; wiring smoke tests in MCPManager, MCPConnectionFactory, MCPServersInitializer, and MCP.spec.js. |
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