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fix: preserve tool_use stop reason from being overwritten by finishReason

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When a tool call is made, stopReason is set to 'tool_use'. However, when
finishReason: STOP arrives later, it was overwriting stopReason back to
'end_turn', breaking multi-turn tool conversations in clients like OpenCode.

Fix: Initialize stopReason to null and only set it from finishReason if
not already set. This ensures tool_use is preserved once detected.

Fixes #96

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Badri Narayanan S
2026-01-11 11:52:35 +05:30
parent 7b921abb1d
commit 325acdba8c
1 changed files with 4 additions and 4 deletions
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8
src/cloudcode/sse-streamer.js
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@@ -27,7 +27,7 @@ export async function* streamSSEResponse(response, originalModel) {
let inputTokens = 0;
let outputTokens = 0;
let cacheReadTokens = 0;
let stopReason = 'end_turn';
let stopReason = null;
const reader = response.body.getReader();
const decoder = new TextDecoder();
@@ -212,8 +212,8 @@ export async function* streamSSEResponse(response, originalModel) {
}
}
// Check finish reason
if (firstCandidate.finishReason) {
// Check finish reason (only if not already set by tool_use)
if (firstCandidate.finishReason && !stopReason) {
if (firstCandidate.finishReason === 'MAX_TOKENS') {
stopReason = 'max_tokens';
} else if (firstCandidate.finishReason === 'STOP') {
@@ -248,7 +248,7 @@ export async function* streamSSEResponse(response, originalModel) {
// Emit message_delta and message_stop
yield {
type: 'message_delta',
delta: { stop_reason: stopReason, stop_sequence: null },
delta: { stop_reason: stopReason || 'end_turn', stop_sequence: null },
usage: {
output_tokens: outputTokens,
cache_read_input_tokens: cacheReadTokens,