feat(agent): preserve Anthropic thinking blocks and enable interleaved thinking#120
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spachava753 merged 1 commit intomainfrom Dec 22, 2025
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…d thinking When resuming conversations across different providers, thinking blocks from one provider (e.g., Gemini) are incompatible with another (e.g., Anthropic). Previously, CPE filtered out all thinking blocks, but this prevented Claude from benefiting from its own preserved reasoning when resuming conversations. The new AnthropicThinkingBlockFilter identifies Anthropic thinking blocks by checking for the `anthropic_thinking_signature` key in ExtraFields, keeping those while filtering out thinking blocks from other providers. Non-Anthropic generators continue to use the existing BlockWhitelistFilter that removes all thinking blocks. Additionally, Anthropic API requests now include beta headers for interleaved thinking (`interleaved-thinking-2025-05-14`) and server-side context management (`context-management-2025-06-27`), enabling Claude to reason between tool calls and allowing the API to manage thinking block retention automatically. Closes #115
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Summary
When resuming conversations across different providers, thinking blocks from one provider (e.g., Gemini) are incompatible with another (e.g., Anthropic). Previously, CPE filtered out all thinking blocks, but this prevented Claude from benefiting from its own preserved reasoning when resuming conversations.
Changes
New AnthropicThinkingBlockFilter: Identifies Anthropic thinking blocks by checking for the
anthropic_thinking_signaturekey in ExtraFields, keeping those while filtering out thinking blocks from other providers. Non-Anthropic generators continue to use the existing BlockWhitelistFilter.Beta headers for Anthropic: API requests now include:
interleaved-thinking-2025-05-14- enables Claude to reason between tool callscontext-management-2025-06-27- enables server-side thinking block retention managementTesting
Added comprehensive tests for the new filter covering Anthropic/Gemini/OpenRouter thinking blocks, edge cases, and mixed provider conversations.
Closes #115