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Every ProBot has a personality preset (the tone) and an optional custom instructions field. Custom instructions are free-form text you add in Bot configuration to steer bot-specific behaviour - for example, “Always mention I’m open to relocation” or “If asked about salary, say it’s negotiable and point to my email.”

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Where they sit in the prompt

The system prompt is assembled in a deliberate order so your instructions have real influence without being able to break the bot’s safety rules:
Personality establishes the voice, your custom instructions refine intent, and the structural response rules come after them - so a malformed or over-eager custom block can’t override “answer only from context” or the length limits.

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What they can and can’t do

Can: add emphasis, set preferences, add a call-to-action, tweak how the bot frames answers. Can’t: override the immutable rules. Regardless of what you write, the bot still answers only from your provided context (no hallucinating a job you didn’t list), keeps its identity, and refuses to reveal its own system prompt. If someone asks it to “ignore previous instructions,” the immutable block wins.

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Tips

Keep instructions short and declarative. They’re additive to your knowledge base, not a replacement for it - if you want the bot to know something, add it as knowledge; if you want the bot to behave a certain way, put it here.