feat(agent-tars): support flexible system prompt override#1151
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Align with tarko agent behavior where instructions can completely override the default system prompt instead of just appending.
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Use layered approach where custom instructions come first but core system capabilities maintain higher priority, ensuring agent-tars functionality is preserved while allowing user customization.
User instructions should have higher priority than system defaults. Place user instructions after system prompt with explicit priority.
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Summary
Improves AgentTARS system prompt handling with a layered approach that preserves core functionality while giving user instructions higher priority.
Problem: Original concatenation approach (
${systemPrompt}\n\n${options.instructions}) put user instructions at the end, making them less effective. Direct override would break agent-tars core capabilities.Solution: Layered prompt strategy where:
Before:
${systemPrompt}\n\n${options.instructions}- user instructions simply appendedAfter: System prompt first, then user instructions with explicit priority marker
This ensures user instructions can effectively override default behavior while maintaining agent-tars reliability.
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