When building LLM Agents, treat the system prompt + framework prompt blocks as a contract with the agent’s inputs and tool/sub-agent configuration.

Apply these rules:

• Bind required variables: an Agent’s data inputs come from keys (variables) that must be used together with the system prompt. In practice, open the key list (e.g., / or the (x) button) and ensure every variable referenced by the prompt/framework blocks is supplied.
• Use framework blocks with the expected inputs: for example, task_analysis should receive agent_prompt, task, tool_desc, and context, and plan_generation should generate the next execution plan from task_analysis results.
• Make tool usage deterministic: if tools are available, specify in the prompt what kinds of tasks should trigger which tools.
• Don’t assume “lead agent only” activation: framework prompt blocks should appear/operate when an Agent has Tools or Subagents configured (verify by checking the Framework dropdown after configuring Tools/Subagents), and ensure subagent delegation keeps the prompt contract intact.

Example pattern (conceptual):

System prompt (with variables):
- Role + instructions
- Tool policy: “Use Tool A for classification/summarization; use Tool B for retrieval; otherwise ask a clarifying question.”

Framework blocks:
- task_analysis(agent_prompt, task, tool_desc, context) -> produces structured analysis
- plan_generation(...) -> creates the next steps based on that analysis

Keys:
- Provide all variables referenced by system prompt/framework blocks.
- Confirm required keys exist via the keys UI (/ or (x)).