Pull Request Checklist

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Before submitting, make sure you've checked the following:

• Target branch: Verify that the pull request targets the dev branch. Not targeting the dev branch may lead to immediate closure of the PR.
• Description: Provide a concise description of the changes made in this pull request.
• Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
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• Title Prefix: To clearly categorize this pull request, prefix the pull request title using one of the following:
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Changelog Entry

Description

• Track thinking block signature if provided with as part of a streaming delta
• Include thinking_blocks with post-tool-call LLM calls (reconstructed from reasoning block)

Fixed

• Fix anthropic reasoning-enabled responses stopping after a native tool call

Additional Information

• Fixes issue identified here: issue: Output stops after first tool call with reasoning enabled (new regression in 0.6.34) #18442

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