diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 6820eee952..22b8bb2d93 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -146,12 +146,15 @@ functions:
         script: |
           ${PREPARE_SHELL}
           rm -rf $DRIVERS_TOOLS
-          if [ "${project}" = "drivers-tools" ]; then
-            # If this was a patch build, doing a fresh clone would not actually test the patch
-            cp -R ${PROJECT_DIRECTORY}/ $DRIVERS_TOOLS
-          else
-            git clone https://github.com/mongodb-labs/drivers-evergreen-tools.git $DRIVERS_TOOLS
-          fi
+          git clone https://github.com/mongodb-labs/drivers-evergreen-tools.git $DRIVERS_TOOLS
+
+          # Pin drivers-evergreen-tools to revision 98f6b0e (Aug 20, 2025).
+          # In leu of cutting a dedicated branch, please cherry-pick any required changes inline.
+          # For example:
+          #   git -C $DRIVERS_TOOLS checkout 98f6b0e
+          #   git -C $DRIVERS_TOOLS cherry-pick <sha> # needed for <reason>
+          git -C $DRIVERS_TOOLS checkout 98f6b0e
+
           echo "{ \"releases\": { \"default\": \"$MONGODB_BINARIES\" }}" > $MONGO_ORCHESTRATION_HOME/orchestration.config
     - command: shell.exec
       params:
@@ -384,7 +387,7 @@ functions:
         working_dir: src/go.mongodb.org/mongo-driver
         script: |
           ${PREPARE_SHELL}
-          ${BUILD_ENV|} BUILD_TAGS=${BUILD_TAGS|-tags=cse,gssapi} make ${targets}
+          ${BUILD_ENV|} BUILD_TAGS=${BUILD_TAGS|-tags=cse,gssapi,mongointernal} make ${targets}
 
   run-tests:
     - command: shell.exec
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index db12c76224..ec4bbb529d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -49,6 +49,9 @@ repos:
   hooks:
     - id: markdown-link-check
       exclude: ^(vendor)
+      # If the endpoint returns HTTP 429 (Too Many Requests), consider it a
+      # successful check.
+      args: ["-a 200,206,429"]
 
 - repo: local
   hooks:
diff --git a/mongo/integration/mongointernal_test.go b/mongo/integration/mongointernal_test.go
new file mode 100644
index 0000000000..1cdb099d72
--- /dev/null
+++ b/mongo/integration/mongointernal_test.go
@@ -0,0 +1,98 @@
+// Copyright (C) MongoDB, Inc. 2025-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+//go:build mongointernal
+
+package integration
+
+import (
+	"context"
+	"testing"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/internal/assert"
+	"go.mongodb.org/mongo-driver/internal/require"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/integration/mtest"
+	"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
+)
+
+func TestNewSessionWithLSID(t *testing.T) {
+	mt := mtest.New(t)
+
+	mt.Run("can be used to pass a specific session ID to CRUD commands", func(mt *mtest.T) {
+		mt.Parallel()
+
+		// Create a session ID document, which is a BSON document with field
+		// "id" containing a 16-byte UUID (binary subtype 4).
+		sessionID := bson.Raw(bsoncore.NewDocumentBuilder().
+			AppendBinary("id", 4, []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}).
+			Build())
+
+		sess := mongo.NewSessionWithLSID(mt.Client, sessionID)
+
+		ctx := mongo.NewSessionContext(context.Background(), sess)
+		_, err := mt.Coll.InsertOne(ctx, bson.D{{"foo", "bar"}})
+		require.NoError(mt, err)
+
+		evt := mt.GetStartedEvent()
+		val, err := evt.Command.LookupErr("lsid")
+		require.NoError(mt, err, "lsid should be present in the command document")
+
+		doc, ok := val.DocumentOK()
+		require.True(mt, ok, "lsid should be a document")
+
+		assert.Equal(mt, sessionID, doc)
+	})
+
+	mt.Run("EndSession panics", func(mt *mtest.T) {
+		mt.Parallel()
+
+		sessionID := bson.Raw(bsoncore.NewDocumentBuilder().
+			AppendBinary("id", 4, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}).
+			Build())
+		sess := mongo.NewSessionWithLSID(mt.Client, sessionID)
+
+		// Use a defer-recover block to catch the expected panic and assert that
+		// the recovered error is not nil.
+		defer func() {
+			err := recover()
+			assert.NotNil(mt, err, "expected EndSession to panic")
+		}()
+
+		// Expect this call to panic.
+		sess.EndSession(context.Background())
+
+		// We expect that calling EndSession on a Session returned by
+		// NewSessionWithLSID panics. This code will only be reached if EndSession
+		// doesn't panic.
+		t.Errorf("expected EndSession to panic")
+	})
+
+	mt.Run("ClientSession.SetServer panics", func(mt *mtest.T) {
+		mt.Parallel()
+
+		sessionID := bson.Raw(bsoncore.NewDocumentBuilder().
+			AppendBinary("id", 4, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}).
+			Build())
+		sess := mongo.NewSessionWithLSID(mt.Client, sessionID)
+
+		// Use a defer-recover block to catch the expected panic and assert that
+		// the recovered error is not nil.
+		defer func() {
+			err := recover()
+			assert.NotNil(mt, err, "expected ClientSession.SetServer to panic")
+		}()
+
+		// Expect this call to panic.
+		sess.(mongo.XSession).ClientSession().SetServer()
+
+		// We expect that calling ClientSession.SetServer on a Session returned
+		// by NewSessionWithLSID panics. This code will only be reached if
+		// ClientSession.SetServer doesn't panic.
+		t.Errorf("expected ClientSession.SetServer to panic")
+	})
+}
diff --git a/mongo/mongointernal.go b/mongo/mongointernal.go
new file mode 100644
index 0000000000..0148756fc3
--- /dev/null
+++ b/mongo/mongointernal.go
@@ -0,0 +1,41 @@
+// Copyright (C) MongoDB, Inc. 2025-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+//go:build mongointernal
+
+package mongo
+
+import (
+	"time"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
+	"go.mongodb.org/mongo-driver/x/mongo/driver/session"
+)
+
+// NewSessionWithLSID returns a Session with the given sessionID document. The
+// sessionID is a BSON document with key "id" containing a 16-byte UUID (binary
+// subtype 4).
+//
+// Sessions returned by NewSessionWithLSID are never added to the driver's
+// session pool. Calling "EndSession" or "ClientSession.SetServer" on a Session
+// returned by NewSessionWithLSID will panic.
+//
+// NewSessionWithLSID is intended only for internal use and may be changed or
+// removed at any time.
+func NewSessionWithLSID(client *Client, sessionID bson.Raw) Session {
+	return &sessionImpl{
+		clientSession: &session.Client{
+			Server: &session.Server{
+				SessionID: bsoncore.Document(sessionID),
+				LastUsed:  time.Now(),
+			},
+			ClientID: client.id,
+		},
+		client:     client,
+		deployment: client.deployment,
+	}
+}