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fix(ai): restore onFinish callback in ToolLoopAgent stream and generate methods#15823

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MaitreyeeDeshmukh:fix/tool-loop-agent-on-finish-callback
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fix(ai): restore onFinish callback in ToolLoopAgent stream and generate methods#15823
MaitreyeeDeshmukh wants to merge 2 commits into
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MaitreyeeDeshmukh:fix/tool-loop-agent-on-finish-callback

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Background

PR #13698 accidentally removed onFinish from callbackArgs in both ToolLoopAgent.stream() and ToolLoopAgent.generate() while removing experimental callbacks. onFinish is a stable public API callback, not experimental — any handler passed to the agent was silently dropped after that change.

What changed

Added onFinish: mergeCallbacks(this.settings.onFinish, onFinish) back to callbackArgs in both methods in packages/ai/src/agent/tool-loop-agent.ts, immediately after the existing onStepFinish line.

Testing

Added two regression tests to tool-loop-agent.test.ts — one for generate() and one for stream() — verifying onFinish is called on completion. All 103 tests pass locally.

Closes #14330

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Bug: onFinish callback not working in ToolLoopAgent.stream() since v6.0.135

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