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fix: for anthropic compat ensure empty msgs and empty reasoning is filtered out

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Aiden Cline
2026-01-05 01:18:46 -06:00
parent 4d187af9d2
commit c285304acf
2 changed files with 194 additions and 0 deletions
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19
packages/opencode/src/provider/transform.ts
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@@ -17,6 +17,25 @@ function mimeToModality(mime: string): Modality | undefined {
export namespace ProviderTransform {
function normalizeMessages(msgs: ModelMessage[], model: Provider.Model): ModelMessage[] {
// Anthropic rejects messages with empty content - filter out empty string messages
// and remove empty text/reasoning parts from array content
if (model.api.npm === "@ai-sdk/anthropic") {
msgs = msgs
.map((msg) => {
if (typeof msg.content === "string") return msg
if (!Array.isArray(msg.content)) return msg
const filtered = msg.content.filter((part) => {
if (part.type === "text" || part.type === "reasoning") {
return part.text !== ""
}
return true
})
if (filtered.length === 0) return undefined
return { ...msg, content: filtered }
})
.filter((msg): msg is ModelMessage => msg !== undefined && msg.content !== "")
}
if (model.api.id.includes("claude")) {
return msgs.map((msg) => {
if ((msg.role === "assistant" || msg.role === "tool") && Array.isArray(msg.content)) {