Lesson Content

The problem Custom Instructions solve.

Every time you start a new Claude conversation without context, Claude knows nothing about you – not your profession, your communication preferences, your regular use cases, or what kind of responses work best for your workflow. You either re-explain this every time (tedious and repetitive) or accept generic responses that do not fit your situation.

Custom Instructions is the feature that solves this. It lets you tell Claude things about yourself and your preferences once – and Claude applies that context to every conversation automatically.

What Custom Instructions typically cover.

Most effective Custom Instructions include two types of information:

Type 1 – About you (background context):

• Your profession and role
• Your experience level in areas you work in frequently
• Your typical use cases for Claude
• Your communication context (who your audience usually is, what industry you work in)

Type 2 – How you want Claude to respond:

• Preferred response length (brief vs. comprehensive)
• Preferred tone (formal, direct, conversational)
• Format preferences (prose vs. bullets, headers vs. no headers)
• Things to always avoid (jargon, excessive caveats, unnecessary preambles)
• What you will always provide yourself (so Claude does not assume)

How to access Custom Instructions.

Custom Instructions are typically found in your account settings or profile menu. Look for "Custom Instructions," "Preferences," or "Personalization" – the label may vary by interface version. If you cannot find it, search Claude's help documentation for "custom instructions" to find the current location in your interface.

Writing effective Custom Instructions.

Be specific. Vague instructions produce vague results.

Weak example:

I like short answers and I work in business.

Strong example:

I am a project manager at a mid-size manufacturing company. My team manages production scheduling and vendor relationships. I typically use Claude for: drafting communications (internal and vendor-facing), building project plans, analyzing tradeoffs, and preparing for difficult conversations. Preferred responses: direct and concise. Skip preambles – start with the answer. Use bullet points for lists, prose for explanations. Assume I have intermediate professional knowledge of operations and project management. Do not include excessive caveats or qualifications unless accuracy genuinely requires them.

What Custom Instructions do NOT do.

• They do not give Claude access to your files, calendar, email, or any external system
• They do not guarantee Claude will follow them perfectly in every response – treat them as a strong default, not a hard rule
• They do not replace prompt-level instructions for specific tasks – a Custom Instruction sets your default, but you can override it in any individual conversation
• They do not persist in shared conversations or API calls (verify this in your current interface)

Updating your Custom Instructions.

Your needs change. Your Custom Instructions should too. Review them monthly, or any time you notice Claude is consistently responding in a way that does not fit your current work. Custom Instructions are not a "set and forget" feature – they are a living configuration you maintain.

Overriding Custom Instructions for a specific conversation.

If your Custom Instructions set a default that does not fit a specific task, override it directly in the prompt:

"For this conversation, ignore my usual preference for brief responses – I need a comprehensive, detailed answer."

Your default settings remain; you just override them for this context.