diff --git a/README.md b/README.md
index 54194a42..4a6f7b84 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ The DashScope Python SDK is the official client for [Alibaba Cloud Model Studio
 | Entry point | Module-level static classes: `Generation.call(...)` | A resource-style client: `client.chat.completions.create(...)` |
 | One-liner | — | `dashscope.chat("qwen-plus", "Tell me a joke")` |
 | Response | Raw dict-like; check `status_code == HTTPStatus.OK` | Typed object; read `resp.output_text`, `resp.usage.total_tokens` |
-| Errors | Inspect `resp.code` / `resp.message` by hand | Typed `DashScopeError` exceptions raised by default |
+| Errors | Inspect `resp.code` / `resp.message` by hand | Typed `DashScopeError` exceptions raised by default *(evolving)* |
 | Streaming | Generator of raw frames | `ChatStream` with `.text_stream`, `.reasoning_stream`, `.get_final_message()` |
 | Protocols | DashScope native + a separate compatible-mode entry | One client speaks `native`, `openai`, or `anthropic` via `protocol=` |
 | Async | Separate `Aio*` classes | `dashscope.AsyncClient()` mirrors the whole sync surface |
@@ -26,13 +26,11 @@ The DashScope Python SDK is the official client for [Alibaba Cloud Model Studio
 pip install -U dashscope
 ```
 
-The base install covers SDK API calls and the `dashscope` CLI command. Python 3.9+ is required. Optional feature groups are available as extras:
+The base install covers SDK API calls, the `dashscope` CLI command, Agentic RL fine-tuning and the local tokenizer. Python 3.9+ is required. One optional feature group remains:
 
 | Extra | Provides | Install |
 |-------|----------|---------|
 | `acli` | Interactive AI assistant (DashScope SDK Expert) | `pip install "dashscope[acli]"` |
-| `rl` | Agentic RL fine-tuning | `pip install "dashscope[rl]"` |
-| `tokenizer` | Local tokenizer without downloads | `pip install "dashscope[tokenizer]"` |
 
 To install from a source checkout:
 
@@ -191,6 +189,8 @@ By default each frame is incremental. Pass `incremental_output=False` to receive
 
 ### Errors
 
+> **Still evolving.** The 2.0 typed error surface is under active development — new exception classes may be added and the API-error-code → exception mapping may be refined. Catch the base `errors.DashScopeError` if you need to stay forward-compatible.
+
 Failures raise a typed `DashScopeError` by default (both non-2xx HTTP statuses and HTTP-200-with-a-business-error land here):
 
 ```python
diff --git a/README_zh.md b/README_zh.md
index 31cec0b6..eb6ad822 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -13,7 +13,7 @@ DashScope Python SDK 是[阿里云百炼（Model Studio）](https://help.aliyun.
 | 入口 | 模块级静态类：`Generation.call(...)` | 资源风格客户端：`client.chat.completions.create(...)` |
 | 一行调用 | —— | `dashscope.chat("qwen-plus", "讲个笑话")` |
 | 响应 | 裸字典；需判断 `status_code == HTTPStatus.OK` | 类型化对象；直接读 `resp.output_text`、`resp.usage.total_tokens` |
-| 错误 | 手动检查 `resp.code` / `resp.message` | 默认抛出类型化的 `DashScopeError` 异常 |
+| 错误 | 手动检查 `resp.code` / `resp.message` | 默认抛出类型化的 `DashScopeError` 异常 *（完善中）* |
 | 流式 | 裸帧生成器 | `ChatStream`，提供 `.text_stream`、`.reasoning_stream`、`.get_final_message()` |
 | 协议 | DashScope 原生 + 单独的 compatible-mode 入口 | 一个客户端通过 `protocol=` 讲 `native`、`openai` 或 `anthropic` |
 | 异步 | 独立的 `Aio*` 类 | `dashscope.AsyncClient()` 完整镜像同步接口 |
@@ -26,13 +26,11 @@ DashScope Python SDK 是[阿里云百炼（Model Studio）](https://help.aliyun.
 pip install -U dashscope
 ```
 
-基础安装包含 SDK API 调用和 `dashscope` CLI 命令，要求 Python 3.9+。可选功能组通过 extras 安装：
+基础安装包含 SDK API 调用、`dashscope` CLI 命令、Agentic RL 微调和本地 tokenizer，要求 Python 3.9+。仅剩一个可选功能组：
 
 | Extra | 提供的能力 | 安装命令 |
 |-------|----------|---------|
 | `acli` | 交互式 AI 助手（DashScope SDK Expert） | `pip install "dashscope[acli]"` |
-| `rl` | Agentic RL 微调 | `pip install "dashscope[rl]"` |
-| `tokenizer` | 本地 tokenizer（无需下载） | `pip install "dashscope[tokenizer]"` |
 
 从源码安装：
 
@@ -191,6 +189,8 @@ for text in stream.text_stream:            # 内容增量
 
 ### 错误
 
+> **仍在完善中。** 2.0 的类型化错误体系正在持续开发 —— 可能新增异常类，API 错误码到异常类的映射也可能调整。若需要向前兼容，请捕获基类 `errors.DashScopeError`。
+
 失败默认抛出类型化的 `DashScopeError`（非 2xx 的 HTTP 状态码，以及 HTTP 200 但业务报错，都会归入这里）：
 
 ```python
diff --git a/dashscope/cli/__init__.py b/dashscope/cli/__init__.py
index 93de0d15..244d227b 100644
--- a/dashscope/cli/__init__.py
+++ b/dashscope/cli/__init__.py
@@ -489,13 +489,13 @@ def _register_rl_app():
 
 def _rl_unavailable_detail(exception: Exception) -> str:
     """Render a deferred rl import failure as an actionable message."""
-    # The message quotes a literal 'dashscope[rl]'; unescaped, rich reads
-    # [rl] as a style tag and prints an install command with no extras.
+    # Unescaped, rich reads a bracketed run in the exception text as a style
+    # tag and drops it from the printed output.
     detail = escape(str(exception))
     if "pip install" not in detail:
         detail += (
-            ". Install the optional dependencies with: "
-            "[bold]pip install 'dashscope\\[rl]'[/bold]"
+            ". Reinstall to pull in the missing dependencies: "
+            "[bold]pip install -U dashscope[/bold]"
         )
     return detail
 
diff --git a/dashscope/finetune/reinforcement/__init__.py b/dashscope/finetune/reinforcement/__init__.py
index cbe8d459..bd4d16c5 100644
--- a/dashscope/finetune/reinforcement/__init__.py
+++ b/dashscope/finetune/reinforcement/__init__.py
@@ -5,8 +5,8 @@
     import yaml  # noqa: F401
 except ImportError as _rl_dep_err:
     raise ImportError(
-        "Agentic RL fine-tuning needs optional dependencies. "
-        "Install them with: pip install 'dashscope[rl]'",
+        "Agentic RL fine-tuning dependencies are missing from this "
+        "install. Reinstall with: pip install -U dashscope",
     ) from _rl_dep_err
 
 from dashscope.finetune.reinforcement.common.constants import (
diff --git a/dashscope/finetune/reinforcement/component/observability/processor_span.py b/dashscope/finetune/reinforcement/component/observability/processor_span.py
index 95b3005d..65fc3824 100644
--- a/dashscope/finetune/reinforcement/component/observability/processor_span.py
+++ b/dashscope/finetune/reinforcement/component/observability/processor_span.py
@@ -102,12 +102,9 @@ def _run_with_span(
             if tracer is None or not _OTEL_SPAN_API:
                 if is_tracing_enabled() and tracer is None:
                     logger.warning(
-                        (
-                            "ENABLE_TRAJECTORY is set but "
-                            "OpenTelemetry is not "
-                            "installed. "
-                            "pip install 'dashscope[agentic_rl_tracing]'"
-                        ),
+                        "ENABLE_TRAJECTORY is set but "
+                        "OpenTelemetry is not installed. "
+                        "Reinstall the SDK with: pip install -U dashscope",
                     )
                 return fn(self, input_data, *args, **kwargs)
 
diff --git a/dashscope/finetune/reinforcement/component/observability/tracing.py b/dashscope/finetune/reinforcement/component/observability/tracing.py
index 8c65d3c8..1da284b7 100644
--- a/dashscope/finetune/reinforcement/component/observability/tracing.py
+++ b/dashscope/finetune/reinforcement/component/observability/tracing.py
@@ -2,8 +2,7 @@
 """
 OpenTelemetry tracing for rollout / reward processors.
 
-Enable tracing (install OpenTelemetry, e.g.
-``pip install 'dashscope[agentic_rl_tracing]'``):
+OpenTelemetry ships with the SDK; enable tracing with:
 
 - ``ENABLE_TRAJECTORY=true``
 
@@ -752,8 +751,8 @@ def trace_processor_process(
     if not _OTEL_AVAILABLE:
         logger.warning(
             "ENABLE_TRAJECTORY is set but "
-            "OpenTelemetry is not installed. Install with: "
-            "pip install 'dashscope[agentic_rl_tracing]'",
+            "OpenTelemetry is not installed. Reinstall the SDK with: "
+            "pip install -U dashscope",
         )
         return processor.process(input_data)
 
@@ -796,8 +795,8 @@ async def async_trace_processor_process(
     if not _OTEL_AVAILABLE:
         logger.warning(
             "ENABLE_TRAJECTORY is set but "
-            "OpenTelemetry is not installed. Install with: "
-            "pip install 'dashscope[agentic_rl_tracing]'",
+            "OpenTelemetry is not installed. Reinstall the SDK with: "
+            "pip install -U dashscope",
         )
         return await processor.process(input_data)
 
diff --git a/dashscope/finetune/reinforcement/examples/observability/smoke_observability.py b/dashscope/finetune/reinforcement/examples/observability/smoke_observability.py
index 73fdcaa5..d34cc349 100644
--- a/dashscope/finetune/reinforcement/examples/observability/smoke_observability.py
+++ b/dashscope/finetune/reinforcement/examples/observability/smoke_observability.py
@@ -13,7 +13,7 @@
 - `trace_tool(...)`: tool instrumentation (one canonical shape)
 
 Prerequisites (example):
-  pip install -e ".[agentic_rl_tracing]"
+  pip install -e .
   pip install loongsuite-util-genai
 
 Run:
diff --git a/requirements-test.txt b/requirements-test.txt
index 8cc6117f..e034ab94 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -9,7 +9,7 @@ coverage
 pydantic>=2.0,<3.0
 tenacity
 typing_extensions
-# Optional extras exercised by tests/unit (cli, acli, rl)
+# Optional extras exercised by tests/unit (cli, acli)
 typer>=0.9.0
 rich>=13.0.0
 prompt-toolkit>=3.0
diff --git a/requirements.txt b/requirements.txt
index 79ae6161..62c1e161 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,10 @@ rich>=13.0.0
 httpx>=0.27.0
 httpx-sse>=0.4.0
 typing_extensions>=4.16.0
+tiktoken
+pydantic>=2.0
+tenacity
+PyYAML>=6.0
+fastapi>=0.100
+uvicorn>=0.20
+opentelemetry-sdk>=1.20
diff --git a/setup.py b/setup.py
index e3fbb8ef..12345c1b 100644
--- a/setup.py
+++ b/setup.py
@@ -101,7 +101,6 @@ def run(self):
     install_requires=get_dependencies(),
     include_package_data=True,
     extras_require={
-        "tokenizer": ["tiktoken"],
         # Interactive AI assistant (dashscope.acli); typer/rich are core deps
         "acli": [
             "prompt-toolkit>=3.0",
@@ -124,15 +123,6 @@ def run(self):
             "numpy>=1.20",
             "opencv-python-headless>=4.5",
         ],
-        # Agentic RL fine-tuning (dashscope.finetune.reinforcement)
-        "rl": [
-            "pydantic>=2.0",
-            "tenacity",
-            "PyYAML>=6.0",
-            "fastapi>=0.100",
-            "uvicorn>=0.20",
-            "opentelemetry-sdk>=1.20",
-        ],
     },
     zip_safe=False,
     cmdclass=cmdclass,
diff --git a/tests/unit/test_cli_main.py b/tests/unit/test_cli_main.py
index 22f9c341..aac880ae 100644
--- a/tests/unit/test_cli_main.py
+++ b/tests/unit/test_cli_main.py
@@ -267,15 +267,15 @@ def test_rl_import_failure_is_silent_until_the_command_is_used(
         monkeypatch,
         capsys,
     ):
-        # `rl` is an optional extra, so importing dashscope.cli must not tell
+        # The rl import is deferred, so importing dashscope.cli must not tell
         # the user about a dependency they may never ask for.
         monkeypatch.setattr(dashscope.cli, "_RL_IMPORT_ERROR", None)
         monkeypatch.setitem(
             sys.modules,
             "dashscope.cli.agentic_rl",
             _ImportErrorOnApp(
-                "Agentic RL fine-tuning needs optional dependencies. "
-                "Install them with: pip install 'dashscope[rl]'",
+                "Agentic RL fine-tuning dependencies are missing from this "
+                "install. Reinstall with: pip install -U dashscope",
             ),
         )
 
@@ -284,16 +284,19 @@ def test_rl_import_failure_is_silent_until_the_command_is_used(
         assert capsys.readouterr().err == ""
         assert isinstance(dashscope.cli._RL_IMPORT_ERROR, ImportError)
 
-    def test_rl_command_keeps_the_extras_name(self, monkeypatch, capsys):
-        # rich reads a literal [rl] as a style tag and drops it, which used to
-        # print `pip install 'dashscope'` — a command that installs none of
-        # the extras the message is about.
+    def test_rl_command_prints_the_install_command_verbatim(
+        self,
+        monkeypatch,
+        capsys,
+    ):
+        # The error already carries its own remedy, so the fallback hint in
+        # _rl_unavailable_detail must not be appended a second time.
         monkeypatch.setattr(
             dashscope.cli,
             "_RL_IMPORT_ERROR",
             ImportError(
-                "Agentic RL fine-tuning needs optional dependencies. "
-                "Install them with: pip install 'dashscope[rl]'",
+                "Agentic RL fine-tuning dependencies are missing from this "
+                "install. Reinstall with: pip install -U dashscope",
             ),
         )
         monkeypatch.setattr(sys, "argv", ["dashscope", "rl", "list"])
@@ -303,8 +306,8 @@ def test_rl_command_keeps_the_extras_name(self, monkeypatch, capsys):
 
         assert exception_info.value.code == 1
         err = " ".join(capsys.readouterr().err.split())
-        assert "pip install 'dashscope[rl]'" in err
-        assert err.count("Install") == 1
+        assert "pip install -U dashscope" in err
+        assert err.count("Reinstall") == 1
 
     def test_rl_command_adds_a_hint_when_the_error_has_none(
         self,
@@ -323,9 +326,9 @@ def test_rl_command_adds_a_hint_when_the_error_has_none(
 
         err = " ".join(capsys.readouterr().err.split())
         assert "No module named 'typer_x'" in err
-        assert "pip install 'dashscope[rl]'" in err
+        assert "pip install -U dashscope" in err
 
-    def test_unrelated_command_is_not_told_about_missing_rl_extras(
+    def test_unrelated_command_is_not_told_about_missing_rl_dependencies(
         self,
         monkeypatch,
         capsys,
@@ -333,7 +336,7 @@ def test_unrelated_command_is_not_told_about_missing_rl_extras(
         monkeypatch.setattr(
             dashscope.cli,
             "_RL_IMPORT_ERROR",
-            ImportError("pip install 'dashscope[rl]'"),
+            ImportError("Reinstall with: pip install -U dashscope"),
         )
         monkeypatch.setattr(sys, "argv", ["dashscope"])
         monkeypatch.setattr(