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fix: expand Anthropic detection and strip whitespace-only text blocks #12634

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fix: expand Anthropic detection and strip whitespace-only text blocks #12634

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6f8e62b
fix: expand Anthropic detection and strip whitespace-only text blocks
kiennq Feb 7, 2026
2979111
Merge branch 'dev' into fix/anthropic-detection-trim
kiennq Feb 8, 2026
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17 changes: 12 additions & 5 deletions packages/opencode/src/provider/transform.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -46,19 +46,26 @@ export namespace ProviderTransform {
model: Provider.Model,
options: Record<string, unknown>,
): 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") {
const anthropic =
model.providerID === "anthropic" ||
model.api.id.includes("anthropic") ||
model.api.id.includes("claude") ||
model.id.includes("anthropic") ||
model.id.includes("claude") ||
model.api.npm === "@ai-sdk/anthropic"

// Anthropic rejects messages with empty content - remove empty/whitespace text blocks
if (anthropic) {
msgs = msgs
.map((msg) => {
if (typeof msg.content === "string") {
if (msg.content === "") return undefined
if (msg.content.trim() === "") return undefined
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 part.text.trim() !== ""
}
return true
})
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