[NA] Invert default config to require --deepassert flag for plugin to work…

README.md

@@ -86,10 +86,10 @@ pip install -e .
 - Works seamlessly with `pytest.approx()`, `mock.ANY` and any custom comparator utilities
 - Handles complex nested structures intelligently
 
-### **Zero Configuration**
-- **Just install and it works** - no setup required
-- Can be disabled with `--no-deepassert` flag
-- **Drop-in replacement** for standard assertions
+### **Simple Opt-In**
+- **Enable with `--deepassert` flag** - disabled by default to avoid interference
+- No additional configuration needed
+- **Drop-in replacement** for standard assertions when enabled
 
 ---
 
@@ -225,7 +225,7 @@ E       }
 
 </details>
 
-#### ✨ **With pytest-deepassert** (with `pytest -vv`)
+#### ✨ **With pytest-deepassert** (with `pytest --deepassert -vv`)
 
 ```
 example_test1.py::test_user_profile_comparison FAILED
@@ -355,30 +355,25 @@ E     [... standard pytest diff continues below ...]
 
 ## 💡 Usage
 
-### **Automatic Enhancement**
-
-Once installed, `pytest-deepassert` **automatically** enhances all your `==` assertions inside the tests. No code changes required!
-
-
-### **Configuration Options**
-
-#### Disable deepassert
+After installation, enable `pytest-deepassert` by passing the `--deepassert` flag when running pytest:
 
 ```bash
-pytest --no-deepassert
+pytest --deepassert
 ```
 
+This will enhance all your `==` assertions inside the tests. No code changes required!
+
 ---
 
 ## Configuration
 
-`pytest-deepassert` works out of the box with **zero configuration**. However, you can customize its behavior:
+`pytest-deepassert` is **disabled by default** to avoid any interference with your existing test suite. Enable it when needed:
 
 ### Command Line Options
 
 | Option | Description |
 |--------|-------------|
-| `--no-deepassert` | Disable pytest-deepassert for this test run |
+| `--deepassert` | Enable pytest-deepassert for this test run |
 
 
 ---

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "pytest-deepassert"
-version = "0.2.0"
+version = "0.3.0"
 description = "A pytest plugin for enhanced assertion reporting with detailed diffs"
 readme = "README.md"
 requires-python = ">=3.8"

src/pytest_deepassert/plugin/hook.py

@@ -8,9 +8,9 @@ def pytest_addoption(parser):  # type: ignore
     """Add command line options for pytest-deepassert."""
     group = parser.getgroup("deepassert")
     group.addoption(
-        "--no-deepassert",
+        "--deepassert",
         action="store_true",
-        help="Disable deep assertion diffs from pytest-deepassert",
+        help="Enable deep assertion diffs from pytest-deepassert",
     )
 
 
@@ -31,7 +31,7 @@ def pytest_assertrepr_compare(
         A list of strings representing the formatted comparison output,
         or None if not handled.
     """
-    if config.getoption("--no-deepassert"):
+    if not config.getoption("--deepassert"):
         return None
 
     if op != "==":