diff --git a/go/ai/embedder.go b/go/ai/embedder.go
index 041f56e76..bec1ff492 100644
--- a/go/ai/embedder.go
+++ b/go/ai/embedder.go
@@ -20,11 +20,9 @@ import (
 	"github.com/firebase/genkit/go/core"
 )
 
-// Embedder is the interface used to convert a document to a
-// multidimensional vector. A [DocumentStore] will use a value of this type.
-type Embedder interface {
-	Embed(context.Context, *EmbedRequest) ([]float32, error)
-}
+// EmbedderAction is used to convert a document to a
+// multidimensional vector.
+type EmbedderAction = core.Action[*EmbedRequest, []float32, struct{}]
 
 // EmbedRequest is the data we pass to convert a document
 // to a multidimensional vector.
@@ -34,25 +32,22 @@ type EmbedRequest struct {
 }
 
 // DefineEmbedder registers the given embed function as an action, and returns an
-// [Embedder] whose Embed method runs it.
-func DefineEmbedder(provider, name string, embed func(context.Context, *EmbedRequest) ([]float32, error)) Embedder {
-	return embedder{core.DefineAction(provider, name, core.ActionTypeEmbedder, nil, embed)}
+// [EmbedderAction] that runs it.
+func DefineEmbedder(provider, name string, embed func(context.Context, *EmbedRequest) ([]float32, error)) *EmbedderAction {
+	return core.DefineAction(provider, name, core.ActionTypeEmbedder, nil, embed)
 }
 
-// LookupEmbedder looks up an [Embedder] registered by [DefineEmbedder].
-// It returns nil if the Embedder was not defined.
-func LookupEmbedder(provider, name string) Embedder {
+// LookupEmbedder looks up an [EmbedderAction] registered by [DefineEmbedder].
+// It returns nil if the embedder was not defined.
+func LookupEmbedder(provider, name string) *EmbedderAction {
 	action := core.LookupActionFor[*EmbedRequest, []float32, struct{}](core.ActionTypeEmbedder, provider, name)
 	if action == nil {
 		return nil
 	}
-	return embedder{action}
-}
-
-type embedder struct {
-	embedAction *core.Action[*EmbedRequest, []float32, struct{}]
+	return action
 }
 
-func (e embedder) Embed(ctx context.Context, req *EmbedRequest) ([]float32, error) {
-	return e.embedAction.Run(ctx, req, nil)
+// Embed runs the given [EmbedderAction].
+func Embed(ctx context.Context, emb *EmbedderAction, req *EmbedRequest) ([]float32, error) {
+	return emb.Run(ctx, req, nil)
 }
diff --git a/go/internal/fakeembedder/fakeembedder.go b/go/internal/fakeembedder/fakeembedder.go
index 9b5b7da01..47c2e06b6 100644
--- a/go/internal/fakeembedder/fakeembedder.go
+++ b/go/internal/fakeembedder/fakeembedder.go
@@ -43,7 +43,6 @@ func (e *Embedder) Register(d *ai.Document, vals []float32) {
 	e.registry[d] = vals
 }
 
-// Embed implements genkit.Embedder.
 func (e *Embedder) Embed(ctx context.Context, req *ai.EmbedRequest) ([]float32, error) {
 	vals, ok := e.registry[req.Document]
 	if !ok {
diff --git a/go/internal/fakeembedder/fakeembedder_test.go b/go/internal/fakeembedder/fakeembedder_test.go
index ea50dfe9e..85319054f 100644
--- a/go/internal/fakeembedder/fakeembedder_test.go
+++ b/go/internal/fakeembedder/fakeembedder_test.go
@@ -24,19 +24,17 @@ import (
 
 func TestFakeEmbedder(t *testing.T) {
 	embed := New()
-
+	embedAction := ai.DefineEmbedder("fake", "embed", embed.Embed)
 	d := ai.DocumentFromText("fakeembedder test", nil)
 
 	vals := []float32{1, 2}
 	embed.Register(d, vals)
 
-	var genkitEmbedder ai.Embedder
-	genkitEmbedder = embed
 	req := &ai.EmbedRequest{
 		Document: d,
 	}
 	ctx := context.Background()
-	got, err := genkitEmbedder.Embed(ctx, req)
+	got, err := ai.Embed(ctx, embedAction, req)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -45,7 +43,7 @@ func TestFakeEmbedder(t *testing.T) {
 	}
 
 	req.Document = ai.DocumentFromText("missing document", nil)
-	if _, err = genkitEmbedder.Embed(ctx, req); err == nil {
+	if _, err = ai.Embed(ctx, embedAction, req); err == nil {
 		t.Error("embedding unknown document succeeded unexpectedly")
 	}
 }
diff --git a/go/plugins/googleai/googleai.go b/go/plugins/googleai/googleai.go
index 01f06e470..098de5f15 100644
--- a/go/plugins/googleai/googleai.go
+++ b/go/plugins/googleai/googleai.go
@@ -121,9 +121,9 @@ func Model(name string) *ai.ModelAction {
 	return ai.LookupModel(provider, name)
 }
 
-// Embedder returns the embedder with the given name.
+// Embedder returns the [ai.EmbedderAction] with the given name.
 // It returns nil if the embedder was not configured.
-func Embedder(name string) ai.Embedder {
+func Embedder(name string) *ai.EmbedderAction {
 	return ai.LookupEmbedder(provider, name)
 }
 
diff --git a/go/plugins/googleai/googleai_test.go b/go/plugins/googleai/googleai_test.go
index 83a677975..dc1656ca2 100644
--- a/go/plugins/googleai/googleai_test.go
+++ b/go/plugins/googleai/googleai_test.go
@@ -82,7 +82,7 @@ func TestLive(t *testing.T) {
 		},
 	)
 	t.Run("embedder", func(t *testing.T) {
-		out, err := googleai.Embedder(embeddingModel).Embed(ctx, &ai.EmbedRequest{
+		out, err := ai.Embed(ctx, googleai.Embedder(embeddingModel), &ai.EmbedRequest{
 			Document: ai.DocumentFromText("yellow banana", nil),
 		})
 		if err != nil {
diff --git a/go/plugins/localvec/localvec.go b/go/plugins/localvec/localvec.go
index 428f31802..8213c1f3d 100644
--- a/go/plugins/localvec/localvec.go
+++ b/go/plugins/localvec/localvec.go
@@ -38,7 +38,7 @@ import (
 // retriever with genkit, and also return it.
 // This retriever may only be used by a single goroutine at a time.
 // This is based on js/plugins/dev-local-vectorstore/src/index.ts.
-func New(ctx context.Context, dir, name string, embedder ai.Embedder, embedderOptions any) (ai.DocumentStore, error) {
+func New(ctx context.Context, dir, name string, embedder *ai.EmbedderAction, embedderOptions any) (ai.DocumentStore, error) {
 	r, err := newDocStore(ctx, dir, name, embedder, embedderOptions)
 	if err != nil {
 		return nil, err
@@ -50,7 +50,7 @@ func New(ctx context.Context, dir, name string, embedder ai.Embedder, embedderOp
 // for a local vector database.
 type docStore struct {
 	filename        string
-	embedder        ai.Embedder
+	embedder        *ai.EmbedderAction
 	embedderOptions any
 	data            map[string]dbValue
 }
@@ -62,7 +62,7 @@ type dbValue struct {
 }
 
 // newDocStore returns a new ai.DocumentStore to register.
-func newDocStore(ctx context.Context, dir, name string, embedder ai.Embedder, embedderOptions any) (ai.DocumentStore, error) {
+func newDocStore(ctx context.Context, dir, name string, embedder *ai.EmbedderAction, embedderOptions any) (ai.DocumentStore, error) {
 	if err := os.MkdirAll(dir, 0o755); err != nil {
 		return nil, err
 	}
@@ -98,7 +98,7 @@ func (ds *docStore) Index(ctx context.Context, req *ai.IndexerRequest) error {
 			Document: doc,
 			Options:  ds.embedderOptions,
 		}
-		vals, err := ds.embedder.Embed(ctx, ereq)
+		vals, err := ai.Embed(ctx, ds.embedder, ereq)
 		if err != nil {
 			return fmt.Errorf("localvec index embedding failed: %v", err)
 		}
@@ -160,7 +160,7 @@ func (ds *docStore) Retrieve(ctx context.Context, req *ai.RetrieverRequest) (*ai
 		Document: req.Document,
 		Options:  ds.embedderOptions,
 	}
-	vals, err := ds.embedder.Embed(ctx, ereq)
+	vals, err := ai.Embed(ctx, ds.embedder, ereq)
 	if err != nil {
 		return nil, fmt.Errorf("localvec retrieve embedding failed: %v", err)
 	}
diff --git a/go/plugins/localvec/localvec_test.go b/go/plugins/localvec/localvec_test.go
index b48bcb648..8a81cc913 100644
--- a/go/plugins/localvec/localvec_test.go
+++ b/go/plugins/localvec/localvec_test.go
@@ -50,8 +50,8 @@ func TestLocalVec(t *testing.T) {
 	embedder.Register(d1, v1)
 	embedder.Register(d2, v2)
 	embedder.Register(d3, v3)
-
-	ds, err := newDocStore(ctx, t.TempDir(), "testLocalVec", embedder, nil)
+	embedAction := ai.DefineEmbedder("fake", "embedder1", embedder.Embed)
+	ds, err := newDocStore(ctx, t.TempDir(), "testLocalVec", embedAction, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -110,10 +110,11 @@ func TestPersistentIndexing(t *testing.T) {
 	embedder.Register(d1, v1)
 	embedder.Register(d2, v2)
 	embedder.Register(d3, v3)
+	embedAction := ai.DefineEmbedder("fake", "embedder2", embedder.Embed)
 
 	tDir := t.TempDir()
 
-	ds, err := newDocStore(ctx, tDir, "testLocalVec", embedder, nil)
+	ds, err := newDocStore(ctx, tDir, "testLocalVec", embedAction, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -144,7 +145,7 @@ func TestPersistentIndexing(t *testing.T) {
 		t.Errorf("got %d results, expected 2", len(docs))
 	}
 
-	dsAnother, err := newDocStore(ctx, tDir, "testLocalVec", embedder, nil)
+	dsAnother, err := newDocStore(ctx, tDir, "testLocalVec", embedAction, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/go/plugins/pinecone/genkit.go b/go/plugins/pinecone/genkit.go
index 021d0270a..355fbb04d 100644
--- a/go/plugins/pinecone/genkit.go
+++ b/go/plugins/pinecone/genkit.go
@@ -50,7 +50,7 @@ const defaultTextKey = "_content"
 //
 // The textKey parameter is the metadata key to use to store document text
 // in Pinecone; the default is "_content".
-func New(ctx context.Context, apiKey, host string, embedder ai.Embedder, embedderOptions any, textKey string) (ai.DocumentStore, error) {
+func New(ctx context.Context, apiKey, host string, embedder *ai.EmbedderAction, embedderOptions any, textKey string) (ai.DocumentStore, error) {
 	client, err := NewClient(ctx, apiKey)
 	if err != nil {
 		return nil, err
@@ -90,7 +90,7 @@ type RetrieverOptions struct {
 // docStore implements the genkit [ai.DocumentStore] interface.
 type docStore struct {
 	index           *Index
-	embedder        ai.Embedder
+	embedder        *ai.EmbedderAction
 	embedderOptions any
 	textKey         string
 }
@@ -120,7 +120,7 @@ func (ds *docStore) Index(ctx context.Context, req *ai.IndexerRequest) error {
 			Document: doc,
 			Options:  ds.embedderOptions,
 		}
-		vals, err := ds.embedder.Embed(ctx, ereq)
+		vals, err := ai.Embed(ctx, ds.embedder, ereq)
 		if err != nil {
 			return fmt.Errorf("pinecone index embedding failed: %v", err)
 		}
@@ -215,7 +215,7 @@ func (ds *docStore) Retrieve(ctx context.Context, req *ai.RetrieverRequest) (*ai
 		Document: req.Document,
 		Options:  ds.embedderOptions,
 	}
-	vals, err := ds.embedder.Embed(ctx, ereq)
+	vals, err := ai.Embed(ctx, ds.embedder, ereq)
 	if err != nil {
 		return nil, fmt.Errorf("pinecone retrieve embedding failed: %v", err)
 	}
diff --git a/go/plugins/pinecone/genkit_test.go b/go/plugins/pinecone/genkit_test.go
index 73f01eb85..d2837918a 100644
--- a/go/plugins/pinecone/genkit_test.go
+++ b/go/plugins/pinecone/genkit_test.go
@@ -71,8 +71,9 @@ func TestGenkit(t *testing.T) {
 	embedder.Register(d1, v1)
 	embedder.Register(d2, v2)
 	embedder.Register(d3, v3)
+	embedAction := ai.DefineEmbedder("fake", "embedder3", embedder.Embed)
 
-	r, err := New(ctx, *testAPIKey, indexData.Host, embedder, nil, "")
+	r, err := New(ctx, *testAPIKey, indexData.Host, embedAction, nil, "")
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/go/plugins/vertexai/vertexai.go b/go/plugins/vertexai/vertexai.go
index f750e3e14..409cab13d 100644
--- a/go/plugins/vertexai/vertexai.go
+++ b/go/plugins/vertexai/vertexai.go
@@ -113,9 +113,9 @@ func Model(name string) *ai.ModelAction {
 	return ai.LookupModel(provider, name)
 }
 
-// Embedder returns the embedder with the given name.
+// Embedder returns the [ai.EmbedderAction] with the given name.
 // It returns nil if the embedder was not configured.
-func Embedder(name string) ai.Embedder {
+func Embedder(name string) *ai.EmbedderAction {
 	return ai.LookupEmbedder(provider, name)
 }
 
diff --git a/go/plugins/vertexai/vertexai_test.go b/go/plugins/vertexai/vertexai_test.go
index e5ae734ff..d1563c5aa 100644
--- a/go/plugins/vertexai/vertexai_test.go
+++ b/go/plugins/vertexai/vertexai_test.go
@@ -129,7 +129,7 @@ func TestLive(t *testing.T) {
 		}
 	})
 	t.Run("embedder", func(t *testing.T) {
-		out, err := vertexai.Embedder(embedderName).Embed(ctx, &ai.EmbedRequest{
+		out, err := ai.Embed(ctx, vertexai.Embedder(embedderName), &ai.EmbedRequest{
 			Document: ai.DocumentFromText("time flies like an arrow", nil),
 		})
 		if err != nil {