feat(diagnostics): classify OAuth login-required (MCP-1820)#628
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…tate OAuth "needs sign-in" previously fell through to MCPX_UNKNOWN_UNCLASSIFIED, which drives a misleading "file a bug" CTA, and the health calculator marked every OAuth-related error as unhealthy/red — even an expected first-time login. - Add MCPX_OAUTH_LOGIN_REQUIRED (warn) and MCPX_OAUTH_REAUTH_REQUIRED (error) codes with login-oriented catalog entries (never file-a-bug). - ErrOAuthPending.Code() attributes the typed fast-path: default/login-available message -> OAuthLoginRequired; the stored-token-broke (server-5xx) message -> OAuthReauthRequired. - classifyOAuth string backstops catch the stringified forms; re-auth is matched before login because "re-login available" contains "login available". - Health: first-time sign-in (ErrOAuthPending) -> degraded/amber + login + "Sign-in required"; re-auth and other genuine OAuth errors stay unhealthy/red. Connection-failure precedence in isOAuthRelatedError is preserved. - Docs: add docs/errors pages for both codes and list them in the catalog index. Related #MCP-1820
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✅ Gatekeeper approval — Codex review verdict: ACCEPT.
This approval is posted automatically by the MCPProxy Gatekeeper App on behalf of the Codex reviewer (verdict of record lives in the Paperclip review thread). Author≠approver satisfied; QA + CI gates enforced separately.
Auto-approved per Model B (MCP-1249).
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Summary
Foundation task MCP-1820 under epic MCP-1819. Makes OAuth "needs sign-in" classify correctly instead of falling through to
MCPX_UNKNOWN_UNCLASSIFIED(which drives a misleading "file a bug" CTA), and stops the health calculator from painting an expected first-time login as unhealthy/red.Changes
internal/diagnostics/codes.go— addMCPX_OAUTH_LOGIN_REQUIREDandMCPX_OAUTH_REAUTH_REQUIRED(OAUTH domain), documented as actionable user-states (NOT faults).internal/diagnostics/registry.go— catalog entries with login-oriented fix steps (Sign in / Sign in again), never file-a-bug. Login =warn, re-auth =error.internal/diagnostics/classifier.go—classifyOAuthstring backstops:"oauth authentication required","login available","mcpproxy auth login"→ login;"re-login available","re-authentication required","server error with stored token"→ re-auth. Re-auth is matched first because"re-login available"contains"login available".internal/upstream/core/connection_oauth.go—ErrOAuthPending.Code()typed fast-path: default/login-available message →OAuthLoginRequired; the stored-token-broke (server-5xx) message →OAuthReauthRequired.internal/health/calculator.go— error/disconnected branches: first-time sign-in →degraded/amber +login+"Sign-in required"; re-auth and other genuine OAuth errors (revoked /invalid_grant) stayunhealthy/red. Connection-failure precedence inisOAuthRelatedErrorpreserved (offline servers still suggest restart).docs/errors/— pages for both new codes + catalog index entries.Tests (TDD)
internal/diagnostics/classifier_test.go— both codes, typed fast-path + string backstop (incl. the re-login/login substring-ordering case).internal/upstream/core/oauth_error_test.go—ErrOAuthPending.Code()+ end-to-enddiagnostics.Classify.internal/health/calculator_test.go— login → degraded+login+"Sign-in required"; re-auth → unhealthy+login (botherroranddisconnectedstates).Verification
go build ./...— cleango test -race ./internal/diagnostics/... ./internal/health/... ./internal/upstream/... ./internal/runtime/...— all green./scripts/run-linter.sh— 0 issuesRelated #MCP-1820