fix(cursor): login URL visibility, model registry, and oauth-model-alias

[tan-yong-sheng]

Declaration

This pull request is vibe coded with GLM 5.2 + Minimax M3 and Pi Coding Agent.

Summary

Three independent cursor fixes discovered while debugging issue #122:

1. --cursor-login prints the URL on stdout even with logging-to-file: true
2. Model registry no longer collapses to stale fallback on transient GetUsableModels failures
3. oauth-model-alias now works for cursor — the alias resolves correctly to the upstream model name

Each fix has its own commit in this PR for independent review and revert.

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Fix 1 — Login URL visibility (issue #122)

When logging-to-file: true, ConfigureLogOutput redirects all logrus output to ~/.cli-proxy-api/logs/main.log. The cursor login URL was therefore hidden in the log file and the program appeared to hang with a blinking cursor on the terminal — no indication that the URL was waiting in the log.

Switched the four user-facing prompts in sdk/auth/cursor.go from log.* to fmt.Println/Printf so they always reach stdout regardless of the logging setting. log.Warnf for the browser-open failure stays on logrus (diagnostic, not user-facing).

Verified end-to-end: with the new binary and logging-to-file: true, the terminal prints the URL immediately.

Fixes #122

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Fix 2 — Stale model registry on transient failure

FetchCursorModels previously returned GetCursorFallbackModels() on every failure (DNS timeout, non-2xx, empty parse, etc.). The hardcoded list was also months out of date — it contained composer-2, claude-3.5-sonnet, gpt-4o, cursor-small, gemini-2.5-pro — none of which Cursor serves today.

Combined effect: a single transient GetUsableModels failure (observed in the production log at 2026-06-27 21:53:33, dns i/o timeout to api2.cursor.sh) caused the registry reconcile to overwrite the live 119-model list with the stale 6-model fallback, permanently removing composer-2.5 and friends from the registry until the auth file was reloaded. User calls to cursor/composer-2.5 then returned an instant 503 with no executor trace.

Two changes:

• Last-good cache. Package-level cursorModelsCache keyed by auth.ID. On successful live fetch, store the result. On failure, return the cached list when available; fall back to GetCursorFallbackModels only when no prior fetch has populated the cache. A transient blip can no longer collapse the registry.
• Refresh GetCursorFallbackModels to current Cursor model ids (composer-2.5, composer-2.5-fast, gpt-5.3-codex, gpt-5.2, gpt-5.5-high, gpt-5.4-high, claude-opus-4-8-thinking-high, claude-opus-4-7-thinking-high, claude-4.5-sonnet, gemini-3.1-pro). Verified live against api2.cursor.sh on 2026-06-27.

Verified: with the new binary, a configured cursor auth registers 119 models from the live fetch, and a subsequent network blip leaves the registry intact.

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Fix 3 — oauth-model-alias resolution for cursor

The cursor executor used parsed.Model (the model name extracted from the translated request payload) when building the upstream Run request to api2.cursor.sh. For OpenAI-source requests the translator is skipped entirely (the from != "openai" guard), so parsed.Model always equalled whatever the client sent — including an alias name like cursor/composer-2.5 defined under oauth-model-alias in config.yaml.

The conductor does resolve the alias correctly: applyOAuthModelAlias in sdk/cliproxy/auth/conductor.go sets the upstream model name on req.Model. But because parsed.Model still held the alias, the protobuf Run request was encoded with the alias as ModelId. Cursor's Run endpoint does not know cursor/composer-2.5 (only composer-2.5) and returned Connect error not_found. Calling the upstream model name directly worked because no alias was involved.

Fix: buildRunRequestParams gets a third modelOverride parameter. When non-empty it is used as ModelId; otherwise parsed.Model is used so existing behavior is unchanged. All four call sites pass req.Model. parsed.Model is untouched, so the OpenAI response still echoes the client-facing alias name.

Verified: with config:

oauth-model-alias:
  cursor:
    - name: composer-2.5
      alias: cursor/composer-2.5

both cursor/composer-2.5 and composer-2.5 return 200; the alias call's response has "model":"cursor/composer-2.5" (alias echoed), the real-name call has "model":"composer-2.5" (real name). Both reach Cursor with model=composer-2.5.

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Test plan

• gofmt -l clean
• go build ./cmd/server ok
• go test ./... — 0 FAILs across the repo
• New tests: TestCursorModelsOrFallback_PrefersCacheOverHardcoded, TestGetCursorFallbackModels_IsCurrent, TestBuildRunRequestParams_ModelOverride (4 subcases)
• End-to-end with new binary: cursor login URL on stdout, live model registration, alias call success

Files changed

File	Change
sdk/auth/cursor.go	+10/-5
internal/runtime/executor/cursor_executor.go	+99/-20
internal/runtime/executor/cursor_models_cache_test.go	new (~90 lines)
internal/runtime/executor/cursor_executor_buildrequest_test.go	new (~50 lines)

[tan-yong-sheng]

Don't merge, not working when tool calling ...