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fix: remove invalid step-start parts from UIMessage conversion #8949

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fix: remove invalid step-start parts from UIMessage conversion #8949

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15 changes: 5 additions & 10 deletions packages/opencode/src/session/message-v2.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -504,10 +504,8 @@ export namespace MessageV2 {
text: part.text,
providerMetadata: part.metadata,
})
if (part.type === "step-start")
assistantMessage.parts.push({
type: "step-start",
})
// step-start parts are not added to UIMessage since "step-start" is not a valid
// UIMessagePart type in the AI SDK - they are only used internally for tracking
if (part.type === "tool") {
if (part.state.status === "completed") {
assistantMessage.parts.push({
Expand Down Expand Up @@ -556,12 +554,9 @@ export namespace MessageV2 {
}
}

return convertToModelMessages(
result.filter((msg) => msg.parts.some((part) => part.type !== "step-start")),
{
tools: options?.tools,
},
)
return convertToModelMessages(result, {
tools: options?.tools,
})
}

export const stream = fn(Identifier.schema("session"), async function* (sessionID) {
Expand Down