diff --git a/.github/workflows/test-sdk-python.yml b/.github/workflows/test-sdk-python.yml
index 1c3746e7..a59af41d 100644
--- a/.github/workflows/test-sdk-python.yml
+++ b/.github/workflows/test-sdk-python.yml
@@ -68,13 +68,11 @@ jobs:
         with:
           python-version: "3.13"
 
-      # 1.x still lists the vendor SDKs as dependencies, so they are removed again here;
-      # from 2.0 the plain install brings none and the uninstall step can go.
-      - name: Install the package without vendor SDKs
+      # The plain install, as a caller who brings their own provider has it.
+      - name: Install the package without extras
         run: |
           python -m pip install --upgrade pip
           pip install . pytest pytest-asyncio
-          pip uninstall -y openai anthropic google-genai
 
       - name: Every evaluator without them
         run: python -m pytest tests/unit/test_without_vendor_sdks.py -p no:cacheprovider
diff --git a/sdks/python/README.md b/sdks/python/README.md
index b213685a..a3569d0e 100644
--- a/sdks/python/README.md
+++ b/sdks/python/README.md
@@ -31,7 +31,7 @@ Python SDK for [Learning Commons evaluators](https://docs.learningcommons.org/ev
 ## Dependencies
 
 - Python 3.11+
-- `pydantic`, `httpx`, `pillow`, and `textstat`, plus the provider clients (`openai`, `anthropic`, `google-genai`), each also available as an extra (see [Installation](#installation)).
+- `pydantic`, `httpx`, `pillow`, and `textstat`. The provider clients (`openai`, `anthropic`, `google-genai`) are extras: install the ones your evaluators use (see [Installation](#installation)).
 - Credentials are constructor arguments. The SDK reads no provider keys from the environment, so a shell `GOOGLE_API_KEY` leaves `google_api_key` unset. A missing key raises `ConfigurationError` at construction, before any I/O.
 
 ## Installation
@@ -52,7 +52,7 @@ pip install "learning-commons-evaluators[all]"             # every provider
 
 A `model_override` needs the extra for its provider instead. An evaluator whose provider's SDK is not installed raises `ConfigurationError` at construction, naming the extra to add.
 
-Version 1.x still installs all three provider clients without an extra, so these lines change nothing today. Version 2.0 will install them only through their extras, and the plain `pip install learning-commons-evaluators` will be for [bringing your own provider](#bring-your-own-provider), which needs none.
+The plain `pip install learning-commons-evaluators` installs no provider client. It is for [bringing your own provider](#bring-your-own-provider), which needs none.
 
 Pass the key each evaluator's default provider requires ([which keys](https://docs.learningcommons.org/evaluators/getting-started/quickstart#required-api-keys)):
 
diff --git a/sdks/python/pyproject.toml b/sdks/python/pyproject.toml
index 17cd756d..422ae1d3 100644
--- a/sdks/python/pyproject.toml
+++ b/sdks/python/pyproject.toml
@@ -34,16 +34,8 @@ classifiers = [
 dependencies = [
     "pydantic>=2.0.0,<3",
     "textstat>=0.7.0,<1",
-    # Native provider SDKs (D10): one adapter per SDK under providers/. httpx is what
-    # google-genai transports over and what the error taxonomy reads transport failures
-    # from. openai (since 2.47.0) and anthropic (since 1.0.0) transport over httpx 2,
-    # published as the separate httpx2 package, which they bring themselves; the lower
-    # bounds are the first versions to do so, so httpx2 is always present for the error
-    # classifier and the tests that build the SDKs' exceptions.
-    "openai>=2.47.0,<4",
-    "anthropic>=1.0.0,<2",
-    # 1.39.0 is the first to let a client be closed (Client.close, AsyncClient.aclose).
-    "google-genai>=1.39.0,<3",
+    # What the Knowledge Graph client and google-genai transport over, and what the error
+    # taxonomy reads transport failures from. The provider SDKs are extras, below.
     "httpx>=0.27.0,<1",
     # Image inputs (features/image_source.py): reads an attached file's format and
     # dimensions from its header, without decoding pixels, to enforce the contract's
@@ -65,13 +57,18 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-# One extra per provider, named by its `Provider` value, so the error for a missing SDK
-# names the extra mechanically. Each repeats its pin from `dependencies` above, where the
-# SDKs still sit so that no 1.x install changes; 2.0 drops them from there (DSCR-2625),
-# leaving the base install for callers who inject their own `llm_provider`. Bump a pin in
-# both places until then.
+# Native provider SDKs (D10), one extra per adapter under providers/, named by its
+# `Provider` value so the error for a missing SDK names the extra mechanically. None is
+# in the base install: a caller who injects their own `llm_provider` needs none of them,
+# and most evaluators call one provider. The caps follow the rule above.
+#
+# openai (since 2.47.0) and anthropic (since 1.0.0) transport over httpx 2, published as
+# the separate httpx2 package, which they bring themselves; the lower bounds are the first
+# versions to do so, so httpx2 is present for the error classifier wherever their errors
+# can be raised, and for the tests that build those errors.
 openai = ["openai>=2.47.0,<4"]
 anthropic = ["anthropic>=1.0.0,<2"]
+# 1.39.0 is the first to let a client be closed (Client.close, AsyncClient.aclose).
 google = ["google-genai>=1.39.0,<3"]
 all = ["learning-commons-evaluators[openai,anthropic,google]"]
 dev = [