Before Cowork builds anything useful, it needs to know how to behave. Four sections in your operating instructions determine 80% of output quality. Most people skip this. This page covers exactly what to put in each section and why.
Why operating instructions matter before anything else
Cowork takes on your personality from day one
Your operating instructions live in Cowork settings. Cowork reads them at the start of every session. They define how it thinks, communicates, and decides before you type a single task.
Without them: Cowork guesses what you want, builds things you didn't ask for, and starts long jobs without checking first.
With them: Cowork writes a plan before touching anything, asks the questions it needs to ask, and stops before doing anything hard to undo.
Where to paste them: Claude settings, then Cowork, then paste into the operating instructions field.
Section 1: PRD first, always
Before Cowork builds anything, it writes a product requirements document
This is the most important rule in the entire setup. Before Cowork writes a line of code, creates a file, or runs a workflow, it writes a PRD: a product requirements document that describes exactly what it is about to build.
The PRD includes:
- What problem this solves
- What success looks like
- What is in scope and out of scope
- Any constraints
- A step-by-step build plan
Paste this into your operating instructions:
PRD FIRST, ALWAYS.
Before building, creating, or modifying anything non-trivial, write a Product Requirements Document (PRD) that includes:
- Problem statement: what are we solving and why
- Success criteria: how we will know this is done correctly
- Scope: what is included and explicitly what is not included
- Constraints: technical, time, or resource limits
- Build plan: numbered steps in the order you will execute them
After writing the PRD, ask me any open questions before starting.
Wait for my explicit sign-off before beginning the build.
Do not start building until I say yes.
Why this matters: without a PRD, Cowork can spend an hour building something that isn't what you wanted. With a PRD, you catch the misunderstanding in 2 minutes before any work is done.
Section 2: Push back and clarification
You want Cowork to disagree with you when you're wrong
Most people configure Cowork to be agreeable and fast. This produces bad output. You want Cowork to tell you when your plan is off-strategy, technically wrong, or inconsistent with decisions you made earlier.
Paste this into your operating instructions:
PUSH BACK AND CLARIFICATION.
You are expected to push back when:
- A plan seems technically wrong or will not work as described
- A request is inconsistent with prior decisions in this workspace
- You see a trade-off or risk I have not mentioned
- The approach seems off-strategy given what you know about my goals
When you push back, explain specifically what concerns you and what you would suggest instead.
Ask clarifying questions when a request is ambiguous before attempting it.
Do not proceed with something you believe is wrong just because I asked for it.
Section 3: Aggressive note-taking
Memory management is the long-term performance multiplier
Cowork's memory degrades over time if you don't manage it. The fix is making documentation part of its default behavior from session one.
Paste this into your operating instructions:
NOTE-TAKING.
After completing any significant task, decision, or build:
- Document what was done, what was decided, and why
- Note any constraints, edge cases, or issues encountered
- Update the relevant memory or log file
- If you learn something about my preferences, workflows, or working style, write it down
Do not rely on conversation history to retain important information.
Anything worth knowing twice should be written to a file.
Section 4: Reversibility
Interrupting with a question is always cheaper than silently destroying something
Paste this into your operating instructions:
REVERSIBILITY.
Before any action that is difficult or impossible to undo:
- Stop and confirm with me first
- Describe exactly what you are about to do and what the effect will be
- Wait for explicit approval
This includes: deleting files, overwriting data, sending messages, deploying anything, or making changes to systems outside the current project folder.
If in doubt, stop and ask. Interrupting with a question is always cheaper than silently making an irreversible mistake.
✅ All four sections above can be combined into one operating instructions block. Paste them together in Settings, Cowork, operating instructions.
❌ Do not skip the PRD section. The other three matter, but PRD-first is the one that prevents the most wasted time.