perf: pre-allocate slice capacity in assistantMessageParam

google-labs-jules[bot] · matdev83 · google-labs-jules[bot] · commit 4578000653d9 · 2026-06-29T12:04:49.000Z
Pre-allocate the `blocks` slice in `assistantMessageParam` with `make([]anthropic.ContentBlockParamUnion, 0, len(m.Parts))` to prevent multiple memory reallocations during `append` operations.

Co-authored-by: matdev83 &lt;211248003+matdev83@users.noreply.github.com&gt;
diff --git a/internal/plugins/backends/protocols/anthropicmessages/invoke.go b/internal/plugins/backends/protocols/anthropicmessages/invoke.go
@@ -170,7 +170,7 @@ func assistantMessageParam(m lipapi.Message) (anthropic.MessageParam, error) {
 			return anthropic.MessageParam{}, fmt.Errorf("anthropic: assistant message may only contain text parts in this adapter")
 		}
 	}
-	var blocks []anthropic.ContentBlockParamUnion
+	blocks := make([]anthropic.ContentBlockParamUnion, 0, len(m.Parts))
 	for _, p := range m.Parts {
 		if strings.TrimSpace(p.Text) == "" {
 			continue

Original file line number	Diff line number	Diff line change
`@@ -170,7 +170,7 @@ func assistantMessageParam(m lipapi.Message) (anthropic.MessageParam, error) {`
`170`	`170`	`return anthropic.MessageParam{}, fmt.Errorf("anthropic: assistant message may only contain text parts in this adapter")`
`171`	`171`	`}`
`172`	`172`	`}`
`173`		`- var blocks []anthropic.ContentBlockParamUnion`
	`173`	`+ blocks := make([]anthropic.ContentBlockParamUnion, 0, len(m.Parts))`
`174`	`174`	`for _, p := range m.Parts {`
`175`	`175`	`if strings.TrimSpace(p.Text) == "" {`
`176`	`176`	`continue`