OAuth / account login for providers (OpenRouter, xAI) + subscription-proxy support

[gnanam1990]

Summary

Adds real OAuth / account login for the providers that support it, surfaced as a first-class "Sign in with OAuth" option in both the /provider wizard and first-run onboarding — no API key to paste. Two providers qualify today:

• OpenRouter — public PKCE flow that mints an API key (no client_id needed).
• xAI (Grok) — public OAuth client; the token is used directly as a bearer on api.x.ai/v1. Supports browser and device-code login.

For OpenAI/Anthropic subscriptions (ChatGPT/Claude), which can't be used as a standard bearer by a third-party tool, this ships a documented local-proxy path instead of an unreliable/ToS-risky direct login.

What's included

Runtime auth wiring

• providerio.SendWithAuthRetry + TokenResolver: the OpenAI/Anthropic providers send Authorization: Bearer <oauth> when a login exists for the profile (auto-refreshed; one refresh-and-retry on 401), else fall back to the API key. Never both. Zero per-request overhead for API-key users (resolver attached only when a login exists).

OAuth engine & logins

• internal/oauth: PKCE (S256), loopback browser flow, RFC 8628 device-code flow, token store (0600 / optional OS keyring), env-configurable providers (ZERO_OAUTH_<NAME>_*) + a built-in preset layer (xAI).
• internal/provideroauth.OpenRouterLogin (mints a key) and zero auth openrouter; zero auth login xai [--device].

In-app UX

• A "How do you want to connect?" chooser (wizard + onboarding): Sign in with OAuth lists the OAuth-capable providers → browser/device login → straight to model selection. Browse/API-key path unchanged.
• Device code for headless/SSH: press d (or automatic on SSH / headless Linux / ZERO_OAUTH_DEVICE=1) — shows a URL + code to enter on another device.
• After login, model discovery is authenticated with the OAuth token, so the user picks from the live model list (curated fallback if offline).

Subscription proxies (ChatGPT / Claude)

• chatgpt-proxy preset + docs/oauth-subscriptions.md: full recipe for pointing Zero at a local proxy that holds the subscription session. ChatGPT/Claude are intentionally not in the OAuth chooser (they can't do clean in-app OAuth); they live under the browse path + proxy docs.

Deliberately not included

Direct ChatGPT/Claude subscription login. Verified: the ChatGPT token only works against a Cloudflare-gated backend (403 for non-official clients), and Anthropic's terms prohibit third-party use of a Claude subscription token (enforced with account bans). Spoofing those official clients is fragile and account-risky, so it's not built — the proxy path is the supported alternative.

Testing

• gofmt, go vet, build (host + linux + windows), go test ./... -race — all green.
• staticcheck (no new findings), govulncheck (0), deadcode (no new) — clean.
• Unit tests cover the bearer/retry logic, OAuth engine (loopback + two-phase device), the wizard/onboarding chooser + device shortcut, token-authenticated discovery, and catalog classification. OAuth/proxy flows verified against mock servers.
• No new module dependencies.

Notes

The interactive browser/device approval and the live xAI /models response require a real account to confirm end-to-end; all surrounding logic is unit-tested and the OpenRouter mint flow was run-checked against a mock.

Summary by CodeRabbit

Release Notes

• New Features

  • Added OAuth login across CLI and TUI, including auth openrouter (browser-based PKCE that prints an API key) and RFC 8628 device-code login where supported.
  • Introduced a new “connect method” step in onboarding/provider setup (including device-code shortcuts, OAuth badges, and device-code/browser waiting states).
  • Added per-request OAuth bearer auth for OpenAI- and Anthropic-compatible providers with automatic refresh-on-401 retry, plus optional built-in OAuth presets (opt-in for xAI).

• Documentation

  • Expanded the OAuth subscriptions guide with local proxy configuration examples.

• Bug Fixes

  • Improved OAuth-pending interaction handling (mouse input disabled) and avoided unnecessary onboarding by recognizing stored OAuth logins.

[github-actions]

Zero automated PR review

Verdict: No blockers found

Blockers

• None found.

Validation

• [pass] Diff hygiene: git diff --check
• [pass] Tests: go test ./...
• [pass] Build: go run ./cmd/zero-release build
• [pass] Smoke build: go run ./cmd/zero-release smoke

Scope

Head: ecf38f6cc030
Changed files (37): docs/oauth-subscriptions.md, internal/browser/open.go, internal/browser/open_test.go, internal/cli/app.go, internal/cli/auth.go, internal/cli/auth_test.go, internal/cli/oauth_credential_test.go, internal/cli/oauth_provider.go, internal/cli/setup.go, internal/oauth/manager.go, internal/oauth/manager_test.go, internal/oauth/oauth.go, and 25 more

This deterministic review checks validation status and basic diff hygiene. A human reviewer still owns product judgment and design quality.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro Plus

Run ID: ec0817ef-2cc7-4920-9446-f2214d58370e

📥 Commits

Reviewing files that changed from the base of the PR and between 8ec599b and ecf38f6.

📒 Files selected for processing (5)

• internal/oauth/presets.go
• internal/oauth/presets_test.go
• internal/provideroauth/openrouter.go
• internal/tui/onboarding.go
• internal/tui/onboarding_test.go

🚧 Files skipped from review as they are similar to previous changes (5)

• internal/oauth/presets_test.go
• internal/oauth/presets.go
• internal/provideroauth/openrouter.go
• internal/tui/onboarding_test.go
• internal/tui/onboarding.go

---

Walkthrough

Adds comprehensive OAuth provider authentication to Zero: an ErrNoToken sentinel and RFC 8628 device-code staging in the oauth engine; a TokenResolver callback and SendWithAuthRetry helper in providerio that resolves OAuth bearer tokens with automatic 401 refresh; baked-in OAuth presets with env-var fallback for xAI; provider catalog OAuth capability flags and a new chatgpt-proxy entry; OpenRouter PKCE loopback login; OAuth resolver wiring through OpenAI and Anthropic providers; CLI OAuth setup (zero auth openrouter) with per-profile token resolution and updated onboarding eligibility checks; TUI device-code helpers with stored token retrieval; provider wizard and first-run onboarding method-chooser stages supporting both browser and device-code OAuth flows; and reference documentation for OAuth subscription patterns.

Changes

OAuth Provider Authentication

Layer / File(s)	Summary
OAuth engine: ErrNoToken sentinel and device-code stages internal/oauth/oauth.go, internal/oauth/manager.go, internal/oauth/manager_test.go, internal/oauth/scheduler.go	ErrNoToken sentinel added; PrepareDeviceLogin resolves provider config and requests device code; CompleteDeviceLogin polls with deadline and persists token; token-loading paths refactored to delay provider-config resolution until refresh needed; two-phase split supports async UI flows; scheduler updated to use new loadToken helper.
OAuth presets and ResolveConfig fallback internal/oauth/presets.go, internal/oauth/presets_test.go, internal/oauth/providers.go	builtinOAuthPresets map with xai preset (client ID, endpoints, scopes, flow); lookupOAuthPreset and scopesOrPreset helpers; ResolveConfig merges env vars with preset fields, defaults FLOW to preset or loopback; five test cases cover preset usage, env override, missing config, and opt-in gating.
TokenResolver and SendWithAuthRetry with 401 refresh internal/providers/providerio/auth.go, internal/providers/providerio/auth_test.go	New TokenResolver callback type returns OAuth header/value or ok=false for API-key fallback; SendWithAuthRetry applies resolver, retries once with forceRefresh=true on 401, closes response bodies; withBearer helper clears API-key fields; seven test cases cover fallback, bearer selection, refresh, and error propagation.
Provider catalog OAuth flags and chatgpt-proxy entry internal/providercatalog/catalog.go, internal/providercatalog/catalog_test.go, internal/providercatalog/oauth_test.go	Descriptor gains OAuth, OAuthMintsKey, OAuthDeviceFlow booleans; openrouter and xai marked via oauthProvider helper; chatgpt-proxy local provider entry added with documentation; OAuthProviders() exported function filters and returns cloned descriptors; four test functions validate classification and independence.
OpenRouter PKCE loopback login internal/provideroauth/openrouter.go, internal/provideroauth/openrouter_test.go	OpenRouterLogin starts local callback server, builds PKCE challenge, opens browser with authorization URL, waits for code, calls openRouterExchange to POST code+verifier and extract minted API key; test includes simulateBrowser helper and five error/success cases.
OAuthResolver wiring through providers internal/providers/openai/provider.go, internal/providers/anthropic/provider.go, internal/providers/factory.go	OAuthResolver field added to Options/Provider in both providers; streaming paths switch from SendWithRetry + manual auth to SendWithAuthRetry with resolver and AuthHeaders; factory imports providerio and passes resolver to constructors.
CLI OAuth resolver and zero auth openrouter subcommand internal/cli/oauth_provider.go, internal/cli/auth.go, internal/cli/app.go, internal/cli/setup.go, internal/cli/oauth_credential_test.go, internal/cli/auth_test.go	oauthResolverForProfile builds per-profile TokenResolver from stored tokens with 401 refresh fallback; wired into defaultAppDeps; runAuthOpenRouter performs PKCE login and prints API key; setupRequired recognizes OAuth logins and suppresses onboarding when token exists; three test functions validate credential detection, setup eligibility, and command-line argument handling.
Cross-platform browser launcher internal/browser/open.go, internal/browser/open_test.go	OpenURL selects open/rundll32/xdg-open by platform, starts process without blocking, asynchronously reaps launcher; table-driven test covers darwin/linux/freebsd/windows.
TUI OAuth device-code helpers internal/tui/oauth_device.go, internal/tui/oauth_device_test.go	oauthPreferDeviceFlow checks env/SSH/headless heuristics; oauthDevicePrepare constructs manager with 30s timeout, oauthDeviceComplete polls with 10m timeout, oauthStoredToken retrieves fresh token, oauthDeviceVerifyTarget selects best verification URI; two test functions cover stored-token retrieval and discovery token injection.
Provider wizard OAuth method chooser and flows internal/tui/provider_wizard.go, internal/tui/provider_wizard_discovery.go, internal/tui/provider_wizard_oauth_test.go, internal/tui/provider_wizard_test.go, internal/tui/mouse.go, internal/tui/mouse_test.go, internal/tui/model.go	Wizard gains method-chooser step (OAuth vs browse); oauthPending blocks mouse/key except Esc; d/ctrl+o shortcuts trigger device/OAuth login; step labels and OAuth waiting screen rendered conditionally; OAuth badges shown on providers; discovery resolves stored tokens for token-login providers; fourteen test functions and two helpers cover navigation and state transitions.
First-run onboarding OAuth method and device-code internal/tui/onboarding.go, internal/tui/onboarding_test.go	setupState gains OAuth/device-code fields; method stage added before provider selection; advanceSetup branches for browser/device-code OAuth; save/discovery skip API-key storage for token-login providers; OAuth waiting screen and device-code hints rendered; seven test functions cover method routing, device login, and OAuth success/error handling.
OAuth subscriptions reference documentation docs/oauth-subscriptions.md	Documents built-in OIDC provider login (OpenRouter/xAI wizard flow, device-code), local-proxy pattern for ChatGPT/Claude subscriptions with config examples (chatgpt-proxy, custom-anthropic-compatible), and non-proxy alternatives (API keys, claude CLI).

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant TUIWizard as TUI Provider Wizard
  participant OpenRouterLogin
  participant LocalCallbackServer as Local Callback Server
  participant OpenRouterAPI as OpenRouter API
  participant TokenStore

  User->>TUIWizard: Select "Sign in with OAuth" → openrouter
  TUIWizard->>OpenRouterLogin: OpenRouterLogin(ctx, opts)
  OpenRouterLogin->>LocalCallbackServer: Start 127.0.0.1 listener
  OpenRouterLogin->>User: Print/open authorization URL (PKCE challenge)
  User->>OpenRouterAPI: Authorize in browser
  OpenRouterAPI->>LocalCallbackServer: Redirect /callback?code=...
  LocalCallbackServer-->>OpenRouterLogin: code received
  OpenRouterLogin->>OpenRouterAPI: POST code + PKCE verifier → openRouterExchange
  OpenRouterAPI-->>OpenRouterLogin: { "key": "sk-or-..." }
  OpenRouterLogin-->>TUIWizard: API key string
  TUIWizard->>TokenStore: Save provider:openrouter
  TUIWizard-->>User: Advance to model selection

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sequenceDiagram
  participant User
  participant TUIWizard as TUI Provider Wizard
  participant OAuthManager as OAuth Manager
  participant xAIProvider as xAI Device Endpoint
  participant TokenStore
  participant UpstreamAPI as xAI Inference API

  User->>TUIWizard: Press "d" for device-code login (xAI)
  TUIWizard->>OAuthManager: PrepareDeviceLogin
  OAuthManager->>xAIProvider: Request device code
  xAIProvider-->>OAuthManager: UserCode, VerificationURI
  OAuthManager-->>TUIWizard: DeviceAuth, Config
  TUIWizard-->>User: Show UserCode + VerificationURI
  User->>xAIProvider: Authorize at VerificationURI
  TUIWizard->>OAuthManager: CompleteDeviceLogin (poll)
  OAuthManager->>xAIProvider: Poll for token
  xAIProvider-->>OAuthManager: access token
  OAuthManager->>TokenStore: Save provider:xai
  TUIWizard-->>User: Advance to model selection
  User->>UpstreamAPI: Request (SendWithAuthRetry resolves stored token → Bearer header)

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Estimated code review effort

🎯 5 (Critical) | ⏱️ ~120 minutes

Possibly related PRs

• Gitlawb/zero#210: This PR builds on the oauth engine by adding PrepareDeviceLogin/CompleteDeviceLogin split and ErrNoToken sentinel, extending the manager with two-phase RFC 8628 support.
• Gitlawb/zero#163: Both PRs modify the same first-run setup/onboarding codepaths (internal/cli/setup.go, internal/tui/onboarding.go)—this PR extends that eligibility/UI to support OAuth logins.
• Gitlawb/zero#161: This PR extends the provider wizard OAuth flow and device-code branches introduced in the retrieved PR, adding OAuth connect-method handling on top of existing provider setup UX.

Suggested reviewers

• Vasanthdev2004

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/oauth-provider-login

[coderabbitai]

Actionable comments posted: 7

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

internal/tui/onboarding.go (1)

1539-1547: ⚠️ Potential issue | 🟡 Minor | ⚡ Quick win

Show OAuth token login instead of an env var on the Ready screen.

For OAuth providers that do not mint API keys, completeSetup intentionally stores no API key, but this summary falls through to env var XAI_API_KEY. Make the summary OAuth-aware so the final confirmation matches the credential that will actually be used.

Suggested fix

 func (m model) setupCredentialSummary(option SetupProviderOption) string {
+	if m.setup.oauthMode && m.setupProviderDescriptor().OAuth && !m.setupProviderDescriptor().OAuthMintsKey {
+		return "OAuth token"
+	}
 	if !setupProviderAcceptsAPIKey(option) {
 		return "not required"
 	}

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@internal/tui/onboarding.go` around lines 1539 - 1547, The
setupCredentialSummary function currently falls through to displaying an env var
message for OAuth providers that don't mint API keys, but it should instead show
an OAuth token login message to match what will actually be used. Add a check
after the setupProviderAcceptsAPIKey condition to detect if the provider uses
OAuth. If the provider uses OAuth (and there's no saved API key), return a
message indicating OAuth token login instead of allowing the function to fall
through to the env var case. This ensures the summary accurately reflects the
actual credential method that will be used during setup.

🧹 Nitpick comments (3)

internal/provideroauth/openrouter.go (1)

134-171: 💤 Low value

Minor: use bytes.NewReader to avoid string conversion.

Line 144 converts payload (already a []byte) to string just to wrap it in strings.NewReader. Using bytes.NewReader(payload) avoids the allocation.

Suggested change

-	request, err := http.NewRequestWithContext(ctx, http.MethodPost, base+openRouterKeyExchangePath, strings.NewReader(string(payload)))
+	request, err := http.NewRequestWithContext(ctx, http.MethodPost, base+openRouterKeyExchangePath, bytes.NewReader(payload))

Add "bytes" to imports if not present.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@internal/provideroauth/openrouter.go` around lines 134 - 171, In the
openRouterExchange function, the payload variable (which is already a byte slice
from json.Marshal) is being unnecessarily converted to a string before being
passed to strings.NewReader. Replace strings.NewReader(string(payload)) with
bytes.NewReader(payload) in the http.NewRequestWithContext call to avoid the
inefficient allocation. Ensure the bytes package is imported at the top of the
file if it is not already present.

internal/oauth/presets.go (1)

49-54: ⚡ Quick win

Defensively copy preset scopes before returning.

Line 53 returns the shared preset slice. Any downstream mutation of cfg.Scopes can mutate global preset defaults for later resolutions.

Proposed fix

 func scopesOrPreset(envScopes string, preset []string) []string {
 	if fields := strings.Fields(envScopes); len(fields) > 0 {
 		return fields
 	}
-	return preset
+	return append([]string(nil), preset...)
 }

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@internal/oauth/presets.go` around lines 49 - 54, The scopesOrPreset function
returns the preset slice directly on line 53, which allows downstream code to
mutate the original shared preset defaults. Create a defensive copy of the
preset slice before returning it by using a mechanism like append or
slices.Clone to ensure that any mutations to the returned slice do not affect
the original preset.

internal/oauth/providers.go (1)

31-34: ⚡ Quick win

Update Registry docs to match current behavior.

This comment says there are no built-ins, but ResolveConfig now applies lookupOAuthPreset(name) defaults. Keeping this stale is misleading for operators and reviewers.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@internal/oauth/providers.go` around lines 31 - 34, The Registry comment
states there are no built-in providers or OAuth client identities, but this is
no longer accurate since ResolveConfig now applies built-in preset defaults via
the lookupOAuthPreset function. Update the Registry comment to correctly reflect
that while providers are defined entirely via ZERO_OAUTH_<NAME>_* variables, the
system does include built-in OAuth preset defaults that are applied during
configuration resolution through ResolveConfig, ensuring the documentation
accurately represents the actual behavior.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/oauth-subscriptions.md`:
- Around line 39-42: The code fences containing the mock UI examples are missing
language tags, which causes markdownlint validation to fail and reduces code
clarity. Add the `text` language tag to both code fence blocks (the opening ```
should become ```text) for the two UI mockup sections showing the OAuth sign-in
chooser and the API key/provider options. This applies to the example fence
shown and the sibling fence mentioned in the comment at lines 46-49.
- Around line 86-108: The Anthropic (Claude) section in the documentation
outdated references Anthropic's February 2026 policy as permanently prohibitive
with account bans, but this policy evolved in April 2026 to permit third-party
OAuth usage under a separate pay-as-you-go billing model rather than deducting
from subscription quota. Update the Anthropic bullet point to clarify that the
February 2026 enforcement phase and account disruptions were real, but explain
that Anthropic's stance shifted in April 2026 to allow third-party usage with
distinct billing rather than outright prohibition. Remove or revise the language
stating the policy "explicitly prohibits" subscription-token use and "has
actively enforced it," and instead document that current usage is permitted but
billed separately from the subscription.

In `@internal/oauth/manager.go`:
- Around line 140-164: The PrepareDeviceLogin and CompleteDeviceLogin methods
currently pass the incoming context directly to RequestDeviceCode and
PollDeviceToken respectively without applying a default timeout, which can cause
indefinite hangs on network stalls when context.Background() is passed. Apply a
default timeout to the context parameter in both methods (similar to how the
Login method handles timeouts) before passing it to RequestDeviceCode in
PrepareDeviceLogin and PollDeviceToken in CompleteDeviceLogin to preserve
timeout guarantees.

In `@internal/providercatalog/catalog.go`:
- Around line 262-270: The OAuthProviders() function appends descriptors
directly to the output slice, which differs from other accessor functions like
All(), Get(), and ListByTransport() that use cloneDescriptor() to protect
internal catalog state. To fix this, apply cloneDescriptor() to each descriptor
in the OAuthProviders() function before appending it to the out slice, matching
the pattern used in the other accessor functions. This ensures that callers
cannot mutate shared slice fields like AuthEnvVars, SupportedAPIFormats, and
Aliases.

In `@internal/tui/onboarding.go`:
- Around line 496-498: The OAuth handling logic in internal/tui/onboarding.go
does not validate that incoming OAuth results match the current provider being
set up, allowing stale results from a cancelled provider to be incorrectly
applied when the user starts setup for a different provider. Add a correlation
check comparing msg.providerID against m.setupProviderDescriptor().ID before
processing device-code or final OAuth messages at both locations: the check at
lines 496-498 and the check at lines 514-516. Only apply the OAuth message if
the provider IDs match, preventing mismatched credentials from advancing the
wrong provider's setup flow.
- Around line 499-503: The issue is that OAuth error messages are stored in
setup.oauthErr but this field is only displayed when oauthPending is true. When
an error occurs in the code block that handles msg.err, both oauthPending and
oauthDevice are set to false, which causes setupOAuthWaitingLines to stop
rendering and the user sees the provider list without any error indication. To
fix this, copy the redacted error message from msg.err into setup.err (in
addition to or instead of storing it in oauthErr) so the error is displayed on
the provider selection step. Apply this same fix to the other affected location
where OAuth errors are handled (referenced in the comment as also appearing at
lines 518-520), ensuring consistent error surfacing across all OAuth failure
paths.
- Around line 575-580: The OAuth method selection in the setupStageMethod block
can result in an empty provider list. When m.setup.selectedMethod references an
OAuth option from providerWizardMethodOptions(), the subsequent call to
setupOAuthProviderOptions(m.setup.allProviders) may return an empty list, yet
the code still sets m.setup.oauthMode = true and proceeds with advanceSetup. Fix
this by adding a guard after the oauth flag is set: check if the resulting
provider list from setupOAuthProviderOptions is empty, and if so, either display
an error message and prevent advancement, or revert to API-key setup mode
instead. Apply the same guard logic at the second location where this code
pattern occurs.

---

Outside diff comments:
In `@internal/tui/onboarding.go`:
- Around line 1539-1547: The setupCredentialSummary function currently falls
through to displaying an env var message for OAuth providers that don't mint API
keys, but it should instead show an OAuth token login message to match what will
actually be used. Add a check after the setupProviderAcceptsAPIKey condition to
detect if the provider uses OAuth. If the provider uses OAuth (and there's no
saved API key), return a message indicating OAuth token login instead of
allowing the function to fall through to the env var case. This ensures the
summary accurately reflects the actual credential method that will be used
during setup.

---

Nitpick comments:
In `@internal/oauth/presets.go`:
- Around line 49-54: The scopesOrPreset function returns the preset slice
directly on line 53, which allows downstream code to mutate the original shared
preset defaults. Create a defensive copy of the preset slice before returning it
by using a mechanism like append or slices.Clone to ensure that any mutations to
the returned slice do not affect the original preset.

In `@internal/oauth/providers.go`:
- Around line 31-34: The Registry comment states there are no built-in providers
or OAuth client identities, but this is no longer accurate since ResolveConfig
now applies built-in preset defaults via the lookupOAuthPreset function. Update
the Registry comment to correctly reflect that while providers are defined
entirely via ZERO_OAUTH_<NAME>_* variables, the system does include built-in
OAuth preset defaults that are applied during configuration resolution through
ResolveConfig, ensuring the documentation accurately represents the actual
behavior.

In `@internal/provideroauth/openrouter.go`:
- Around line 134-171: In the openRouterExchange function, the payload variable
(which is already a byte slice from json.Marshal) is being unnecessarily
converted to a string before being passed to strings.NewReader. Replace
strings.NewReader(string(payload)) with bytes.NewReader(payload) in the
http.NewRequestWithContext call to avoid the inefficient allocation. Ensure the
bytes package is imported at the top of the file if it is not already present.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: fda16d90-a22d-461e-aeb8-09c3f9a2ddb4

📥 Commits

Reviewing files that changed from the base of the PR and between e1253c8 and 6b6a47d.

📒 Files selected for processing (32)

• docs/oauth-subscriptions.md
• internal/browser/open.go
• internal/browser/open_test.go
• internal/cli/app.go
• internal/cli/auth.go
• internal/cli/oauth_provider.go
• internal/oauth/manager.go
• internal/oauth/manager_test.go
• internal/oauth/presets.go
• internal/oauth/presets_test.go
• internal/oauth/providers.go
• internal/providercatalog/catalog.go
• internal/providercatalog/catalog_test.go
• internal/providercatalog/oauth_test.go
• internal/provideroauth/openrouter.go
• internal/provideroauth/openrouter_test.go
• internal/providers/anthropic/provider.go
• internal/providers/factory.go
• internal/providers/openai/provider.go
• internal/providers/providerio/auth.go
• internal/providers/providerio/auth_test.go
• internal/tui/model.go
• internal/tui/mouse.go
• internal/tui/mouse_test.go
• internal/tui/oauth_device.go
• internal/tui/oauth_device_test.go
• internal/tui/onboarding.go
• internal/tui/onboarding_test.go
• internal/tui/provider_wizard.go
• internal/tui/provider_wizard_discovery.go
• internal/tui/provider_wizard_oauth_test.go
• internal/tui/provider_wizard_test.go

[Vasanthdev2004]

Verdict: CHANGES REQUESTED 🛑

Reviewed locally in worktree review-pr217 at d054120. The PR adds OAuth login for OpenRouter + xAI, a subscription-proxy recipe, and a wizard UI. gofmt/vet/build clean. All relevant test packages pass — internal/oauth (9.6s), internal/provideroauth (2.3s), internal/providercatalog (0.9s), internal/tui (4.4s). Full suite shows only the pre-existing TestRunExecUsesProjectConfigAndOpenAICompatibleProvider failure (not this PR).

The OpenRouter flow and the docs are clean. The xAI preset, however, breaks the engine's security invariant and must be removed before this lands.

Blocker: hardcoded xAI client_id in internal/oauth/presets.go

var builtinOAuthPresets = map[string]providerPreset{
    "xai": {
        ClientID: "b1a00492-073a-47ea-816f-4c329264a828",
        ...
    },
}

internal/oauth/oauth.go (the package doc) states explicitly:

This package holds NO vendor secrets: provider client IDs and any overridable endpoints come from config/env, so no third-party OAuth client identity is baked into the binary.

This PR violates that invariant. The fact that the value is documented in the preset comment as "public" doesn't change the design intent — the engine was deliberately built to keep third-party OAuth client identities out of the binary. The fact that the preset is "overridable via env" also doesn't help: the default still gets baked in, and any user who runs zero auth login xai with no ZERO_OAUTH_XAI_CLIENT_ID will silently authenticate as b1a00492-....

The PR body says xAI's flow needs that specific client_id and that it's known to be public, but the engine has a documented rule against this. Either:

1. Remove the xAI preset and document that xAI users must set ZERO_OAUTH_XAI_CLIENT_ID (and any other required endpoints) themselves — same posture every other provider gets. The wizard's "Sign in with OAuth" chooser for xAI can then prompt for the client_id if it's missing.
2. Add a runtime opt-in (e.g. ZERO_OAUTH_ALLOW_PRESETS=1) that gates the preset map entirely, so a user explicitly opts in to third-party client identities being baked in.

Option 1 is the cleaner fix and is consistent with the package invariant.

Other observations (informational, can stay as follow-ups)

• The validateTokenEndpoint naming smell I flagged on #210 is re-introduced here (providers.go calls it on cfg.IssuerURL / cfg.AuthorizationEndpoint). Cosmetic; can be a single rename PR across #210/#216/#217.
• The OpenRouter flow (internal/provideroauth/openrouter.go) is exemplary — no client_id needed (the OpenRouter flow is designed that way), PKCE S256, loopback 127.0.0.1, body cap 1 MiB, no key material in error messages. The two new tests (openrouter_test.go) cover the happy path, the missing-code callback, the empty-key response, and the non-2xx exchange.
• The internal/browser/open.go opener is a clean cross-platform abstraction (xdg-open / open / rundll32 url.dll,FileProtocolHandler).
• The internal/providers/providerio/auth.go helper for OpenAI/Anthropic Authorization: Bearer plumbing is small and correct — uses the existing oauth.Manager.GetFresh with a 401-recovery path.
• The setup wizard changes are well-scoped: a "How do you want to connect?" chooser, OAuth card and API-key card are mutually exclusive, the device-code path prints the URL and the user_code on separate lines.

Overall

The architecture is sound, the OpenRouter design is correct, the TUI wizard is tasteful. The only reason this isn't an approve is the hardcoded xAI client_id in presets.go — that single line breaks the package invariant the OAuth engine was designed to uphold. Once it's removed (option 1 above) or gated behind a runtime opt-in, this is a clean approve.

🤖 Generated with Claude Code

[gnanam1990]

Thanks for the thorough reviews — pushed aade9e7 + 2b5b0ad addressing everything.

Blocker — hardcoded xAI client_id (presets.go): made the built-in presets opt-in rather than removing them (your option 2). ResolveConfig only consults builtinOAuthPresets when ZERO_OAUTH_ALLOW_PRESETS is truthy; by default every field comes from ZERO_OAUTH_<NAME>_* env, so no third-party OAuth client identity is used unless the operator explicitly opts in. The "not configured" error now names the flag, and the package / Registry / preset docs + docs/oauth-subscriptions.md were updated. Env still overrides any preset field.

CodeRabbit:

• PrepareDeviceLogin self-bounds the prepare (discovery + device-code request) with opts.Timeout, matching Login; CompleteDeviceLogin bounds the poll by the device code's ExpiresAt.
• OAuthProviders() returns cloned descriptors (matches All()).
• Onboarding ignores a stale OAuth result for a provider the user has switched away from (applySetupOAuth + applySetupOAuthDeviceCode).
• A failed OAuth login is surfaced on the provider list the user lands on (the waiting screen that owned the error is gone once oauthPending clears).
• "Sign in with OAuth" is hidden when a setup's own provider list has no OAuth entry (setupMethodOptions).
• docs: labeled the example fences; updated the Anthropic section for the April 4 2026 third-party cutoff.

Added tests for the preset opt-in gate, the descriptor-clone isolation, and the method-option filtering. gofmt / vet / build (host+linux+windows) / go test -race are green.

Left the validateTokenEndpoint naming as the cross-PR rename follow-up you flagged.

@coderabbitai review

[coderabbitai]

@gnanam1990 Thanks for the detailed summary — the opt-in gate for presets (ZERO_OAUTH_ALLOW_PRESETS) is a clean resolution to the hardcoded client identity concern. Triggering the review now.

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@CodeRabbit rereview

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@gnanam1990 Triggering a full re-review now.

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Actionable comments posted: 7

🧹 Nitpick comments (1)

internal/oauth/presets.go (1)

68-73: ⚡ Quick win

Return a copy of preset scopes to avoid shared mutable state.

On Line 72, scopesOrPreset returns the preset slice directly. That aliases global preset memory; any in-place mutation of returned Config.Scopes can leak into future resolutions. Return a cloned slice for both branches.

♻️ Proposed change

 func scopesOrPreset(envScopes string, preset []string) []string {
 	if fields := strings.Fields(envScopes); len(fields) > 0 {
-		return fields
+		return append([]string(nil), fields...)
 	}
-	return preset
+	return append([]string(nil), preset...)
 }

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@internal/oauth/presets.go` around lines 68 - 73, The scopesOrPreset function
returns the preset slice directly on the return statement, which creates an
alias to global memory and allows in-place mutations to leak into future
resolutions. To fix this, modify the function to return a clone or copy of the
preset slice instead of the preset reference itself. Keep the branch that
returns fields from strings.Fields unchanged, as it already returns a local
slice. Only the preset return statement needs to be modified to return a cloned
copy of the preset slice.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/oauth-subscriptions.md`:
- Around line 90-116: The Anthropic section incorrectly presents the February
2026 enforcement policy as the current permanent stance. Update the text around
the "explicitly prohibits" statement and "no longer cover third-party-tool
usage" passages to: (1) clearly mark February 2026 language as historical
enforcement that occurred at that time, (2) introduce Anthropic's April 4, 2026
policy pivot that now permits third-party OAuth usage but routes it through
separate billing (metered usage or bundles) rather than subscription quota, and
(3) replace prohibitive language with explanatory language about billing
separation so a June 2026 reader understands the current permission model, not
outdated restrictions. Retain the February enforcement details as evidence of
the policy evolution, but restructure the narrative to distinguish past
enforcement from present capability.

In `@internal/cli/auth.go`:
- Around line 358-361: The help text in the auth.go file currently describes
OAuth provider presets as directly usable examples (e.g., 'zero auth login
xai'), but preset usage is actually gated behind the ZERO_OAUTH_ALLOW_PRESETS
environment variable. Update the help text around lines 358-361 to clarify that
presets like "xai" and "openrouter" require setting the ZERO_OAUTH_ALLOW_PRESETS
environment variable before they can be used, so users understand the actual
precondition rather than attempting a command that will fail.
- Around line 50-56: The runAuthOpenRouter function ignores unexpected arguments
after checking for help flags, causing typos or unsupported flags to silently
proceed instead of failing fast. After the help flag check loop in
runAuthOpenRouter, add validation to reject any unexpected arguments by checking
if args contains elements that are not recognized as valid options, then return
a non-success exit code and write an error message to stderr indicating that
unexpected arguments were provided and should not be used with the openrouter
auth command.

In `@internal/providers/providerio/auth.go`:
- Around line 41-57: The resolver function is being called inside the callback
passed to SendWithRetry, which means SendWithRetry will still execute and send
the HTTP request even if the resolver returns an error. Move the auth header
resolution logic (the resolver call) outside and before the SendWithRetry
invocation so that the auth headers are resolved first, and return immediately
from the current function if resolver returns an error, rather than capturing
the error and allowing SendWithRetry to proceed with an unauthenticated request.
This ensures the request is never dispatched when token resolution fails.

In `@internal/tui/mouse.go`:
- Around line 423-425: The selectProviderWizardAtMouse function blocks
click-based provider selection when oauthPending is true, but wheel-scroll
interactions bypass this check and still mutate provider state at other
locations (referenced as Line 73 and Line 104 branches), allowing unwanted state
changes during pending OAuth. Extend the oauthPending check to cover all
provider-wizard mouse interaction paths, including scroll wheel handlers, so
that all mouse-based provider mutations are blocked whenever OAuth is in pending
state. Ensure that any code paths handling mouse wheel events for provider
selection also respect the oauthPending condition before allowing state
mutations.

In `@internal/tui/onboarding_test.go`:
- Around line 93-94: The test sets selectedMethod using
providerWizardMethodOptions() to compute an index, but the actual setup flow
uses filtered options via setupMethodOptions() which can exclude OAuth. This
mismatch causes invalid indices when OAuth is hidden. Replace the call to
providerWizardMethodOptions() with setupMethodOptions() when computing the
selectedMethod index to ensure consistency between the test and the actual setup
implementation. Apply this same fix at all other locations where
providerWizardMethodOptions() is used for setting selectedMethod in the setup
flow.

In `@internal/tui/provider_wizard_oauth_test.go`:
- Around line 166-170: The loop in lines 166-170 that searches for the
"openrouter" provider and sets it as selectedProvider lacks verification that
the provider was actually found. If "openrouter" is missing or renamed, the loop
completes without setting selectedProvider, but the test continues without
detecting this failure. Add an assertion after the loop to verify that the
"openrouter" provider was found and selectedProvider was set to a valid index,
ensuring the test fails immediately if the expected provider is not present
instead of silently testing the wrong provider.

---

Nitpick comments:
In `@internal/oauth/presets.go`:
- Around line 68-73: The scopesOrPreset function returns the preset slice
directly on the return statement, which creates an alias to global memory and
allows in-place mutations to leak into future resolutions. To fix this, modify
the function to return a clone or copy of the preset slice instead of the preset
reference itself. Keep the branch that returns fields from strings.Fields
unchanged, as it already returns a local slice. Only the preset return statement
needs to be modified to return a cloned copy of the preset slice.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

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📥 Commits

Reviewing files that changed from the base of the PR and between e1253c8 and 2b5b0ad.

📒 Files selected for processing (35)

• docs/oauth-subscriptions.md
• internal/browser/open.go
• internal/browser/open_test.go
• internal/cli/app.go
• internal/cli/auth.go
• internal/cli/oauth_credential_test.go
• internal/cli/oauth_provider.go
• internal/cli/setup.go
• internal/oauth/manager.go
• internal/oauth/manager_test.go
• internal/oauth/oauth.go
• internal/oauth/presets.go
• internal/oauth/presets_test.go
• internal/oauth/providers.go
• internal/providercatalog/catalog.go
• internal/providercatalog/catalog_test.go
• internal/providercatalog/oauth_test.go
• internal/provideroauth/openrouter.go
• internal/provideroauth/openrouter_test.go
• internal/providers/anthropic/provider.go
• internal/providers/factory.go
• internal/providers/openai/provider.go
• internal/providers/providerio/auth.go
• internal/providers/providerio/auth_test.go
• internal/tui/model.go
• internal/tui/mouse.go
• internal/tui/mouse_test.go
• internal/tui/oauth_device.go
• internal/tui/oauth_device_test.go
• internal/tui/onboarding.go
• internal/tui/onboarding_test.go
• internal/tui/provider_wizard.go
• internal/tui/provider_wizard_discovery.go
• internal/tui/provider_wizard_oauth_test.go
• internal/tui/provider_wizard_test.go

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@internal/oauth/manager.go`:
- Around line 340-349: The resolveConfigForKey method returns the config from
m.registry.ResolveConfig without calling resolveEndpoints, which causes token
refresh to fail when a provider is configured with only ISSUER_URL (e.g.,
ZERO_OAUTH_<NAME>_ISSUER_URL) without a TOKEN_URL. After retrieving the config
from m.registry.ResolveConfig in the resolveConfigForKey method, call
resolveEndpoints on the returned config before returning it to ensure issuer
metadata is properly resolved for token refresh operations.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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📒 Files selected for processing (2)

• internal/oauth/manager.go
• internal/oauth/scheduler.go

[gnanam1990]

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@CodeRabbit approvable ?

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---

@gnanam1990 Not yet — the PR is still in CHANGES_REQUESTED state with 14 unresolved comments (7 major, 7 minor/nitpick). Here's a precise triage:

🚫 Must-fix before approve (Major)

File	Issue
internal/oauth/manager.go L140/163	PrepareDeviceLogin/CompleteDeviceLogin don't apply a timeout — caller passes context.Background() → unbounded network hang
internal/oauth/manager.go L345	resolveConfigForKey returns config without calling resolveEndpoints → refresh breaks for any provider configured with only ISSUER_URL (no TOKEN_URL)
internal/providers/providerio/auth.go L41-57	Resolver error is captured inside the SendWithRetry callback, so the HTTP request still fires when token resolution fails — move the resolver call before SendWithRetry
internal/tui/mouse.go	Wheel scroll paths bypass the oauthPending check; only click selection is blocked
internal/tui/onboarding.go L496-498	Stale OAuth result from a cancelled provider still applied if user switches providers mid-flow
internal/tui/onboarding.go L499-503	OAuth errors stored in setup.oauthErr are invisible once oauthPending clears — copy to setup.err so the provider list shows them
internal/tui/onboarding.go L575-580	No guard if setupOAuthProviderOptions(m.setup.allProviders) returns empty — sets oauthMode = true and advances with no providers

⚡ Quick wins (Minor/Nitpick)

• docs/oauth-subscriptions.md: bare code fences missing language tag (markdownlint)
• docs/oauth-subscriptions.md: Anthropic section still describes Feb 2026 policy as current — April 4, 2026 pivot (separate billing, not prohibition) should be reflected
• internal/cli/auth.go: runAuthOpenRouter silently ignores unexpected args; help text implies presets work without ZERO_OAUTH_ALLOW_PRESETS
• internal/oauth/presets.go: scopesOrPreset returns the shared preset slice directly — needs append([]string(nil), preset...)
• internal/tui/onboarding_test.go: uses providerWizardMethodOptions() instead of setupMethodOptions() for index — can produce invalid index when OAuth is hidden
• internal/tui/provider_wizard_oauth_test.go L166-170: loop that finds openrouter never asserts it was actually found

The most impactful fix is the SendWithAuthRetry resolver-error one — as written, a token fetch error results in an unauthenticated request being sent rather than an early return.

[gnanam1990]

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[gnanam1990]

@CodeRabbit approvable ?

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@gnanam1990 Getting closer — here's the current honest picture after the latest three rounds of fixes:

✅ All major blockers addressed in commits

Blocker	Fixed in
resolveConfigForKey missing resolveEndpoints	8ec599ba
Resolver error dispatching unauthenticated request (SendWithAuthRetry)	0df50864
Mouse wheel bypassing oauthPending check	0df50864
PrepareDeviceLogin/CompleteDeviceLogin timeout	aade9e79
Stale OAuth result applied on provider switch	aade9e79
OAuth errors invisible after pending screen closes	aade9e79
No guard on empty OAuth provider list	aade9e79

⚡ Still genuinely open (nitpicks, not blocking)

1. internal/oauth/presets.go — scopesOrPreset returns the shared preset slice directly; needs append([]string(nil), preset...) to avoid aliasing global state.
2. internal/oauth/providers.go — Registry doc comment still says "no built-ins"; now stale since lookupOAuthPreset exists.
3. internal/provideroauth/openrouter.go — strings.NewReader(string(payload)) should be bytes.NewReader(payload).
4. internal/tui/onboarding.go (new, outside diff) — setupCredentialSummary shows env var XAI_API_KEY on the Ready screen for OAuth token-login providers instead of "OAuth token".

Why it's still CHANGES_REQUESTED

The previous CHANGES_REQUESTED reviews from both me and @Vasanthdev2004 have not been re-reviewed/dismissed yet. GitHub requires those to be resolved. The critical Vasanthdev2004 concern (hardcoded client_id) was addressed in 2b5b0ad7.

Bottom line: the safety and correctness blockers are all fixed. Knock out the 3 one-liner nitpicks above (the scopesOrPreset copy, the stale comment, and bytes.NewReader), and the setupCredentialSummary UX fix, then request a re-review from @Vasanthdev2004 — that's the last gate.

[gnanam1990]

Pushed ecf38f6 with the remaining nitpicks:

• scopesOrPreset returns a copy of the preset scopes (no aliasing of the shared global slice).
• provideroauth/openrouter uses bytes.NewReader(payload) instead of strings.NewReader(string(payload)).
• setupCredentialSummary shows "OAuth token" on the Ready screen for a token-login provider (xAI) instead of env var XAI_API_KEY; key-minting OAuth (OpenRouter) still resolves to a saved key.

The flagged "Registry doc says no built-ins" was already corrected in the preset opt-in commit (2b5b0ad) — the doc now describes the ZERO_OAUTH_ALLOW_PRESETS gate. Added tests for the scope-slice copy and the OAuth-token summary.

That clears the open items across all four rounds. @Vasanthdev2004 — re-requesting your review; the xAI hardcoded client_id you flagged is resolved in 2b5b0ad (built-in presets are now off by default, opt-in via ZERO_OAUTH_ALLOW_PRESETS).

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@gnanam1990 Review triggered. Here's what I can confirm from the codebase:

Fix	Status
scopesOrPreset returns append([]string(nil), preset...) (presets.go:73)	✅ confirmed
bytes.NewReader(payload) in openrouter.go:145	✅ confirmed
TestScopesOrPresetReturnsACopy test present	✅ confirmed
setupCredentialSummary "OAuth token" display	claimed fixed + tested

All four nitpicks from the last round look addressed. The PR is still in CHANGES_REQUESTED state on GitHub's side — that's a review-state artifact from the earlier rounds (mine + @Vasanthdev2004's). The code-level blockers are all resolved; getting those reviews dismissed/re-reviewed is the remaining gate to merge.

🐇 ✅

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@CodeRabbit approvable ?

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@gnanam1990 Yes — approvable from my side. Every item I flagged across all four rounds is addressed in the codebase:

Round	Items	Status
Major blockers (×7)	resolveConfigForKey endpoints, SendWithAuthRetry early-return on resolver error, mouse wheel oauthPending guard, PrepareDeviceLogin/CompleteDeviceLogin timeouts, stale-OAuth guard, OAuth error surfacing, empty-OAuth-list guard	✅ fixed in 8ec599ba, 0df50864, aade9e79
Nitpicks (×4)	scopesOrPreset returns copy (append([]string(nil), ...)), bytes.NewReader(payload), setupCredentialSummary shows "OAuth token", Registry doc updated	✅ confirmed in ecf38f6

The 14 comments still showing resolved: false in the GitHub API are just UI artifacts — the code changes address every one of them. Approving now.

The one remaining gate is @Vasanthdev2004's CHANGES_REQUESTED review — that's a human re-review you've already requested. No code changes needed on your end.

[approve]

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@CodeRabbit approve

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[Vasanthdev2004]

Verdict: APPROVED ✅

Reviewed locally in worktree review-pr217-fresh at ecf38f6. Latest commits on feat/oauth-provider-login address CodeRabbit rounds 2-4 nitpicks, merge origin/main, and the headline fix from this review: the xAI preset is now opt-in behind ZERO_OAUTH_ALLOW_PRESETS=1. gofmt -l ./internal/oauth ./internal/cli/auth.go ./internal/cli/oauth_provider.go is empty, go vet ./... clean, go build ./... clean. go test ./internal/oauth/... passes (8.6s), go test ./internal/provideroauth/... passes. internal/cli has a pre-existing flake (TestRunExecUsesProjectConfigAndOpenAICompatibleProvider) that also fails on main — not a regression.

Headline fix (resolves prior BLOCKER on hardcoded xAI client_id):

The hardcoded b1a00492-… client_id in internal/oauth/presets.go:38 is still there (any preset has to encode something), but the preset is now inert unless the operator opts in. The wiring:

• presets.go:54-64 — presetsAllowed(env) returns true only when ZERO_OAUTH_ALLOW_PRESETS is 1/true/yes/on. Otherwise the preset is never consulted.
• providers.go:68-71 — ResolveConfig only fetches the preset when presetsAllowed is true. Without the opt-in, every field of the config must come from a ZERO_OAUTH_XAI_* env var.
• providers.go:84 — when a user tries to log in to xAI without configuring it, the error message hints at ZERO_OAUTH_ALLOW_PRESETS=1. Discoverable, not silent.
• presets_test.go:88-93 — regression test asserts that xAI does not resolve from the preset without the opt-in, and that the error string mentions the opt-in. Good test.
• docs/oauth-subscriptions.md (NEW, 184 lines) — documents the two-mode model ("OAuth login for a provider/gateway" vs "use a ChatGPT/Claude subscription via local proxy") and explicitly calls out that presets carry a third-party client identity and are off by default.

This matches the spirit of "ship a preset but don't make it the default credential path." The operator's machine only uses the preset's client_id after explicit opt-in, and any preset field is overridable via env. That's the right shape for a feature like this.

Security invariants (verified by reading the diff):

• PKCE S256 mandatory, "plain" refused (oauth.go:81-82 → ErrPKCEDowngrade). PKCE binds the auth code to this client so a leaked callback URL alone is useless.
• CSRF state mandatory and verified on the callback (oauth.go:83-84 → ErrStateMismatch). loopback.go:37-39 refuses an empty state at listener construction (fail-closed).
• Loopback server binds 127.0.0.1 only on an OS-assigned port (loopback.go:40 — net.Listen("tcp", "127.0.0.1:0")). No 0.0.0.0, no external exposure. Single-use via a buffered result channel; the server is Close()-d after the callback or on context cancel.
• Token files are 0600 (store.go:279, also called out in package doc). Default mode keeps plaintext; opt-in ZERO_OAUTH_STORAGE=aes-gcm (or keyring on macOS/Linux) wraps with AES-256-GCM (encrypt.go). Worth noting: this PR lands the encrypted-at-rest path that the prior feat(oauth): reusable provider OAuth engine + zero auth CLI #210/oauth: opt-in AES-256-GCM encrypted-at-rest token storage #213 PRs staged — the store now reads/writes both shapes transparently.
• Refresh-and-retry on 401 is already in the provider layer (per package doc; not introduced by this PR but exercised by the new tests).
• OpenRouter is a separate bespoke flow (internal/provideroauth/openrouter.go) using PKCE-only — no client_id needed. Not gated behind ALLOW_PRESETS because there's no preset to gate. Minted API key is stored as a normal credential.

Other things to flag (not blockers):

• internal/oauth/presets.go:38 — the xAI client_id is still hardcoded. Given it's now opt-in only, this is fine, but the comment block (lines 29-35) already calls out the "may change without notice" caveat and points to the env override path. Good.
• internal/cli/auth.go:380 — error message at the CLI layer also mentions ZERO_OAUTH_ALLOW_PRESETS=1. Discoverable from both the engine and the CLI.
• docs/oauth-subscriptions.md — the "ChatGPT / Claude subscriptions" section is honest about the proxy requirement. Saves a support ticket.

Overall: the headline blocker from the prior review is resolved — the preset is now an opt-in, not a default. The PR also folds in the encrypted-at-rest store (#213) so the OAuth engine now has a complete security posture. ~3.1k LoC across 37 files, all green in the relevant package tests, 1.5k LoC of new tests, no regressions on main. Merging.

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