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Improve cross-model thinking handling and add gemini-3-flash fallback

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- Add gemini-3-flash to MODEL_FALLBACK_MAP for completeness
- Add hasGeminiHistory() to detect Gemini→Claude cross-model switch
- Trigger recovery for Claude only when Gemini history detected
- Remove unnecessary thinking block filtering for Claude-only conversations
- Add comments explaining '.' placeholder usage
- Remove unused filterUnsignedThinkingFromMessages function

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Badri Narayanan S
2026-01-04 00:11:14 +05:30
parent 53f8d7f6cc
commit 141558dd62
3 changed files with 40 additions and 15 deletions
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22
src/format/request-converter.js
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@@ -15,6 +15,7 @@ import {
removeTrailingThinkingBlocks,
reorderAssistantContent,
filterUnsignedThinkingBlocks,
hasGeminiHistory,
needsThinkingRecovery,
closeToolLoopForThinking
} from './thinking-utils.js';
@@ -77,15 +78,20 @@ export function convertAnthropicToGoogle(anthropicRequest) {
}
}
// Apply thinking recovery for thinking models when needed
// - Gemini: needs recovery for tool loops/interrupted tools (stripped thinking)
// - Claude: needs recovery ONLY when cross-model (incompatible Gemini signatures will be dropped)
// Apply thinking recovery for Gemini thinking models when needed
// Gemini needs recovery for tool loops/interrupted tools (stripped thinking)
let processedMessages = messages;
const targetFamily = isClaudeModel ? 'claude' : isGeminiModel ? 'gemini' : null;
if (isThinking && targetFamily && needsThinkingRecovery(messages)) {
logger.debug(`[RequestConverter] Applying thinking recovery for ${targetFamily}`);
processedMessages = closeToolLoopForThinking(messages, targetFamily);
if (isGeminiModel && isThinking && needsThinkingRecovery(messages)) {
logger.debug('[RequestConverter] Applying thinking recovery for Gemini');
processedMessages = closeToolLoopForThinking(messages, 'gemini');
}
// For Claude: apply recovery only for cross-model (Gemini→Claude) switch
// Detected by checking if history has Gemini-style tool_use with thoughtSignature
if (isClaudeModel && isThinking && hasGeminiHistory(messages) && needsThinkingRecovery(messages)) {
logger.debug('[RequestConverter] Applying thinking recovery for Claude (cross-model from Gemini)');
processedMessages = closeToolLoopForThinking(messages, 'claude');
}
// Convert messages to contents, then filter unsigned thinking blocks
@@ -108,6 +114,8 @@ export function convertAnthropicToGoogle(anthropicRequest) {
// SAFETY: Google API requires at least one part per content message
// This happens when all thinking blocks are filtered out (unsigned)
if (parts.length === 0) {
// Use '.' instead of '' because claude models reject empty text parts.
// A single period is invisible in practice but satisfies the API requirement.
logger.warn('[RequestConverter] WARNING: Empty parts array after filtering, adding placeholder');
parts.push({ text: '.' });
}