Remove anthropic-oauth connector and align docs with supported backends

- Drop Anthropic OAuth plugin surface from core: CLI flag, applicator mapping,
  access-mode validator, resilience personal list, and OAuth discovery tests.
- Remove user-guide and dev-guide references; delete anthropic-oauth.md; add
  TOS-aligned Anthropic API key guidance in anthropic backend and error_handler.
- Refresh backend overview (core vs oauth plugin), access modes, and
  configuration/resilience docs; update sample.env example.

Made-with: Cursor

Author: Mateusz

config/sample.env

@@ -68,7 +68,7 @@ DISABLE_INTERACTIVE_COMMANDS=false
 # MEMORY_PROJECT_DISCOVERY_MODE=any
 
 # Resilience scoping overrides (comma-separated backend types)
-# RESILIENCE_PERSONAL_BACKEND_TYPES=anthropic-oauth,openai-codex
+# RESILIENCE_PERSONAL_BACKEND_TYPES=qwen-oauth,openai-codex
 # RESILIENCE_SHARED_BACKEND_TYPES=openai,openrouter
 
 # Tool Call Repair (auto-convert plain-text tool calls)

docs/development_guide/code-organization.md

@@ -136,7 +136,6 @@ src/connectors/
 ├── openai_codex.py         # OpenAI Codex (OAuth) connector
 ├── openai_responses.py     # OpenAI Responses API connector
 ├── anthropic.py            # [Anthropic](../user_guide/backends/anthropic.md) connector
-├── anthropic_oauth.py      # Anthropic OAuth connector
 ├── gemini.py               # [Gemini](../user_guide/backends/gemini.md) API key connector
 ├── gemini_oauth_base.py    # Base for Gemini OAuth connectors
 ├── gemini_oauth_free.py    # Gemini OAuth free tier

docs/user_guide/access-modes.md

@@ -25,7 +25,7 @@ Access modes prevent common misconfigurations that could:
 
 ### Allowed Behaviors
 
-- **OAuth Connectors**: Full access to OAuth-based connectors (e.g., `gemini-oauth-auto`, `anthropic-oauth`, `qwen-oauth`, `openai-codex`)
+- **OAuth Connectors**: Full access to OAuth-based connectors (e.g., `gemini-oauth-auto`, `qwen-oauth`, `openai-codex`)
 - **Host Binding**: Must bind to `127.0.0.1` only (localhost)
 - **Authentication**: Optional - can be disabled for convenience
 - **OAuth Debugging Flags**: Allowed (e.g., `--enable-gemini-oauth-auto-backend-debugging-override`)
@@ -247,7 +247,7 @@ In Multi User Mode, the following connectors are automatically filtered during s
 
 **By Naming Pattern:**
 - Connectors containing `-oauth-` (e.g., `gemini-oauth-auto`, `gemini-oauth-free`, `gemini-oauth-plan`)
-- Connectors ending with `-oauth` (e.g., `anthropic-oauth`, `qwen-oauth`)
+- Connectors ending with `-oauth` (e.g., `qwen-oauth`)
 
 **By Property:**
 - Connectors with `has_static_credentials = False`
@@ -256,7 +256,6 @@ In Multi User Mode, the following connectors are automatically filtered during s
 - `gemini-oauth-auto`
 - `gemini-oauth-free`
 - `gemini-oauth-plan`
-- `anthropic-oauth`
 - `qwen-oauth`
 - `openai-codex` (uses OAuth via auth.json)
 
@@ -265,11 +264,11 @@ In Multi User Mode, the following connectors are automatically filtered during s
 ```
 # Single User Mode startup logs
 INFO: Starting LLM Proxy in Single User Mode (default)
-DEBUG: Loaded OAuth connectors: gemini-oauth-auto, anthropic-oauth, qwen-oauth, openai-codex
+DEBUG: Loaded OAuth connectors: gemini-oauth-auto, qwen-oauth, openai-codex
 
 # Multi User Mode startup logs
 INFO: Starting LLM Proxy in Multi User Mode
-INFO: Skipped 4 OAuth connectors in Multi User Mode (OAuth not allowed in production)
+INFO: Skipped OAuth connectors in Multi User Mode (OAuth not allowed in production)
 ```
 
 ### Backend Registry Impact
@@ -325,7 +324,6 @@ Replace OAuth backends with API key-based alternatives:
 | OAuth Connector | Static Credential Alternative |
 |----------------|-------------------------------|
 | `gemini-oauth-auto` | `gemini` (requires `GEMINI_API_KEY`) |
-| `anthropic-oauth` | `anthropic` (requires `ANTHROPIC_API_KEY`) |
 | `qwen-oauth` | `qwen` (requires API key configuration) |
 | `openai-codex` | `openai` (requires `OPENAI_API_KEY`) |
 

docs/user_guide/backends/anthropic-oauth.md

@@ -369,16 +369,9 @@ Use Claude models for:
 - Validating instruction following
 - Long context window testing
 
-## Anthropic OAuth Backend
+## Anthropic accounts and API keys
 
-The proxy also supports an `anthropic-oauth` backend that uses OAuth tokens instead of API keys:
-
-```bash
-# Configure OAuth token location
-python -m src.core.cli --default-backend anthropic-oauth
-```
-
-This is useful for using personal Anthropic accounts without API keys.
+Use the `anthropic` backend with a normal [Anthropic API key](https://docs.anthropic.com/en/api/getting-started). Do not route production traffic through unofficial OAuth-token or Claude-Code credential paths; those conflict with Anthropic’s terms and are not documented here.
 
 ## Dedicated Anthropic Port
 

docs/user_guide/backends/anthropic.md

@@ -4,35 +4,46 @@ The LLM Interactive Proxy supports multiple backend providers, allowing you to r
 
 ## Supported Backends
 
-The proxy supports the following backend providers out of the box:
+Backend IDs are the `type:` values in YAML and the `backend_type` carried on requests. **Core connectors** live in this repository and are always import-registered. **OAuth plugin connectors** ship in the sibling package **`llm-interactive-proxy-oauth-connectors`** and register when you install the optional extra, for example `pip install "llm-interactive-proxy[oauth]"` (see `pyproject.toml` optional dependency `oauth`).
+
+### Core connectors (this repository)
 
 | Backend ID | Provider | Authentication | Best For |
 |------------|----------|----------------|----------|
 | `openai` | OpenAI | API Key | Production applications, standard OpenAI models |
-| `openai-codex` | OpenAI (ChatGPT/Codex OAuth) | Local OAuth token | Using ChatGPT login instead of API key |
-| `anthropic` | Anthropic | API Key | Claude models via standard API |
-| `anthropic-oauth` | Anthropic (OAuth) | Local OAuth token | Claude via OAuth credential flow |
-| `cline` | Cline | Local OAuth token | Internal development & debugging |
+| `openai-responses` | OpenAI | API Key | Same credentials as OpenAI; targets `/v1/responses` for structured outputs (see [OpenAI backend](openai.md#openai-responses-backend)) |
+| `openai-codex` | OpenAI (ChatGPT / Codex CLI) | Local OAuth token | ChatGPT login instead of an API key |
+| `anthropic` | Anthropic | API Key | Claude via the standard Anthropic API |
 | `gemini` | Google Gemini | API Key | Metered API usage, production apps |
-| `gemini-oauth-plan` | Google Gemini (CLI) | OAuth | Users with Google One subscription |
-| `gemini-oauth-free` | Google Gemini (CLI) | OAuth | Free tier users |
-| `gemini-cli-acp` | Google Gemini (ACP via Gemini CLI) | Local OAuth token | Quality verifier agents, file-search sub-agents, web-search sub-agents using Google Search |
+| `gemini-cli-acp` | Google Gemini (ACP via Gemini CLI) | Local OAuth token | Sub-agents and tooling via Gemini CLI |
 | `cursor-cli-acp` | Cursor (ACP via Cursor CLI `agent acp`) | Local Cursor login (`agent login`) | Cursor-hosted models through the official CLI; requires `agent` on PATH or `CURSOR_AGENT_BIN` |
-| `gemini-cli-cloud-project` | Google Gemini (GCP) | OAuth + GCP Project | Enterprise, team workflows, central billing |
-| `openrouter` | OpenRouter | API Key | Access to many hosted models |
-| `nvidia` | NVIDIA (NIM / OpenAI-compatible) | API Key (`NVIDIA_API_KEY`) | Hosted NVIDIA integrator or self-hosted NIM |
+| `gemini-cli-cloud-project` | Google Gemini (GCP) | OAuth + GCP project | Enterprise / team billing on Vertex-style flows |
+| `openrouter` | OpenRouter | API Key | Many third-party hosted models behind one API |
+| `nvidia` | NVIDIA (NIM / OpenAI-compatible) | API Key (`NVIDIA_API_KEY`) | NVIDIA integrator or self-hosted NIM |
 | `zenmux` | ZenMux | API Key | OpenAI-compatible ZenMux router |
-| `zai` | ZAI | API Key | Zhipu/Z.ai access |
-| `zai-coding-plan` | ZAI Coding Plan | API Key | Coding-specific workflows |
+| `zai` | ZAI | API Key | Zhipu / Z.ai |
+| `zai-coding-plan` | ZAI Coding Plan | API Key | Coding-plan SKU / workflows |
 | `kimi-code` | Kimi | API Key | Kimi For Coding (OpenAI-compatible) |
-| `opencode-go` | OpenCode Go | API Key | OpenCode Go models with internal OpenAI/Anthropic protocol routing |
-| `minimax` | Minimax | API Key | Minimax AI models |
-| `qwen-oauth` | Alibaba Qwen | Local OAuth token | Qwen CLI OAuth |
-| `qwen-oauth` | Alibaba Qwen | Local OAuth token | Qwen CLI OAuth |
-| `internlm` | InternLM AI | API Key | InternLM models with key rotation |
-| `ollama` | Ollama (Local) | None (local server) | Locally-hosted models + cloud via Ollama app |
-| `hybrid` | Virtual (orchestrates two models) | Inherits from sub-backends | Two-phase reasoning + execution |
-| `antigravity-oauth` | Google Gemini (Antigravity) | Antigravity Token | Internal debugging (Gemini models) |
+| `opencode-go` | OpenCode Go | API Key | OpenCode Go with internal OpenAI/Anthropic-style routing |
+| `minimax` | Minimax | API Key | Minimax models |
+| `internlm` | InternLM | API Key (rotation supported) | InternLM with optional key rotation |
+| `ollama` | Ollama | None (local) | Local and remote models via Ollama |
+| `hybrid` | Virtual (two backends) | Inherits from sub-backends | Two-phase reasoning + execution |
+
+### OAuth plugin connectors (`llm-interactive-proxy-oauth-connectors`)
+
+These entry points are defined in the sibling repo’s `pyproject.toml` under `[project.entry-points."llm_proxy_backends"]`. They are **not** present unless the optional package is installed.
+
+| Backend ID | Provider | Authentication | Best For |
+|------------|----------|----------------|----------|
+| `antigravity-oauth` | Google Gemini (Antigravity) | Antigravity token | Internal / debugging (Gemini-shaped traffic) |
+| `cline` | Cline | Local OAuth token | Internal development and compatibility testing |
+| `gemini-oauth-auto` | Google Gemini (CLI) | Multi-account OAuth | Automatic account rotation across Google logins |
+| `gemini-oauth-plan` | Google Gemini (CLI) | OAuth | Google One / paid CLI tier |
+| `gemini-oauth-free` | Google Gemini (CLI) | OAuth | Free-tier CLI usage |
+| `kiro-oauth-auto` | Amazon Kiro / Q Developer | Self-managed OAuth | Kiro streaming via local OAuth tokens |
+| `opencode-zen` | OpenCode Zen | OAuth | OpenCode Zen API (distinct from `opencode-go`) |
+| `qwen-oauth` | Alibaba Qwen (CLI) | Local OAuth token | Qwen CLI OAuth |
 
 ## Frontend APIs
 
@@ -123,19 +134,36 @@ Or use one-off commands for a single request:
 
 For detailed configuration and usage information for each backend, see:
 
-- [OpenAI Backend](openai.md)
-- [Anthropic Backend](anthropic.md)
-- [Gemini Backends](gemini.md)
-- [Cline Backend](cline.md)
-- [OpenRouter Backend](openrouter.md)
-- [Nvidia Backend](nvidia.md)
-- [ZAI Backend](zai.md)
-- [Qwen Backend](qwen.md)
-- [MiniMax Backend](minimax.md)
-- [ZenMux Backend](zenmux.md)
-- [Kimi Code Backend](kimi-code.md)
-- [OpenCode Go Backend](opencode-go.md)
-- [Ollama Backend (Local)](ollama.md)
+**Core**
+
+- [OpenAI and OpenAI Responses](openai.md) (`openai`, `openai-responses`)
+- [OpenAI Codex](openai-codex.md) (`openai-codex`)
+- [Anthropic](anthropic.md)
+- [Gemini](gemini.md) (API keys, CLI OAuth variants, `gemini-cli-acp`, and `gemini-cli-cloud-project`)
+- **Cursor CLI ACP** (`cursor-cli-acp`): same idea as Gemini CLI ACP but via Cursor’s `agent acp` CLI; install and log in with Cursor’s agent tooling, ensure `agent` is on `PATH` or set `CURSOR_AGENT_BIN`. There is no separate backend guide page yet.
+- [OpenRouter](openrouter.md)
+- [NVIDIA](nvidia.md)
+- [ZAI](zai.md)
+- [Kimi Code](kimi-code.md)
+- [OpenCode Go](opencode-go.md)
+- [Ollama](ollama.md)
+- [InternLM](internlm.md)
+- [MiniMax](minimax.md)
+- [ZenMux](zenmux.md)
+- [Hybrid backend](../features/hybrid-backend.md) (`hybrid`)
+
+**OAuth plugin (`llm-interactive-proxy-oauth-connectors`)**
+
+- [Antigravity OAuth](antigravity-oauth.md)
+- [Cline](cline.md)
+- [Gemini OAuth Auto](gemini-oauth-auto.md) (`gemini-oauth-auto`; overview also in [Gemini backends](gemini.md))
+- [Kiro OAuth Auto](kiro-oauth-auto.md)
+- [OpenCode Zen](opencode-zen.md)
+- [Qwen OAuth](qwen.md)
+- [Gemini OAuth plan / free](gemini.md) (`gemini-oauth-plan`, `gemini-oauth-free`)
+
+**Extensibility**
+
 - [Custom Backends](custom-backends.md)
 
 ## Related Features