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paulpham157 
posted an update Dec 7, 2025
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273
Total context = user message + system instruction (system prompt) + tools, MCP instruction + subagent instruction + skill instruction. Can you control your input token?

What's the context of this

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When you use an agent (chatbot, coding IDE, automation workflows...) you don't just pass in your prompt. The agent also passes in other things, which increases the total context, and the input context length is limited.
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