Stop

name: stop description: Anti-premature-coding protocol. MANDATORY pre-coding checkpoint: execute BEFORE writing ANY code (new features, bug fixes, refactoring, optimization, tests). Use when user requests: "implement/add/fix/refactor/optimize/create feature". Prevents "coding without reading" blindspot that causes most bugs, duplicated work, and broken architectures. Forces systematic investigation via Stop→Trace→Orient→Plan before touching keyboard.

STOP - Stop Coding, Start Thinking

The Blindspot

Your brain lies to you: "I understand the problem, let me start coding!"

This is the most dangerous coding habit. You see a requirement or bug, and your fingers automatically reach for the keyboard. But you haven't:

• Read the existing code
• Understood the architecture
• Found similar patterns
• Identified dependencies

Result: 3 hours coding → 2 hours fixing → because the function already existed / your change broke something / you misunderstood the requirement.

The Philosophy

盲目开工，必返工 (Blind work guarantees rework)

韩非子: "审时度势，而后可动。"

Your code doesn't exist in isolation—it's part of a living codebase. Writing code without reading first is like barging into a conversation and shouting over everyone.

核心原则: Read before you write. Always.

The STOP Protocol

Trigger: When you want to write code (new feature, bug fix, refactor, optimization)

Execute this 4-step protocol (5-15 minutes total):

S - Stop (30 seconds)

Don't touch the keyboard.

Pause. Take a breath. Ask yourself:

• "Do I REALLY understand what needs to be done?"
• "Have I read the relevant code?"
• "What am I missing?"

If you can't answer confidently → Go to T

T - Trace (5-10 minutes)

Map the existing landscape.

Use tools to understand before you act:

1. Find relevant files

   • Use Glob to find related files by pattern
   • Example: **/*user*.ts for user-related code

2. Search for similar implementations

   • Use Grep to find patterns
   • Search for function names, error types, or keywords
   • Example: pattern: "handleLogin" to find existing login logic

3. Read the actual code

   • Use Read to see the full implementation
   • Don't skim—actually read it
   • Understand the WHY, not just the WHAT

4. Trace call hierarchies

   • Use LSP incomingCalls to see who calls this function
   • Use LSP outgoingCalls to see what this function calls
   • Understand dependencies and impact

What you're looking for:

• Does this already exist? (Don't reinvent the wheel)
• How is this pattern currently implemented? (Follow conventions)
• What will break if I change this? (Understand impact)
• What's the architecture? (Respect the design)

O - Orient (2-3 minutes)

Locate yourself in the context.

Now that you've traced the code, answer:

1. Where does my change fit?

   • Which file/module?
   • What's the existing pattern?
   • Should I follow or create new pattern?

2. What's the minimal change?

   • What's the smallest thing that works?
   • Can I reuse existing code?
   • Should I refactor instead?

3. What are the risks?

   • What depends on this code?
   • What could break?
   • What tests exist?

If you can't answer these → Go back to T

P - Plan (1-2 minutes)

Define your approach before coding.

Write down:

1. The specific change

   • File: src/auth/login.ts
   • Function: add error handling to authenticate()
   • Approach: wrap in try-catch, log error, rethrow

2. The testing strategy

   • How will you verify it works?
   • What edge cases exist?

3. The rollback plan

   • If it breaks, how do you undo?

Only NOW can you start coding.

When to Use STOP

ALWAYS. Use for EVERY coding scenario:

✅ New features - Read existing patterns, follow conventions ✅ Bug fixes - Trace the error source, understand the flow ✅ Refactoring - Understand why it's written this way first ✅ Optimization - Find the actual bottleneck before optimizing ✅ Code reviews - Understand the intent before judging ✅ Debugging - Map the call stack before adding logs

Examples

Example 1: New Feature

Task: "Add user logout functionality"

Without STOP: Write logout() function from scratch, spend 2 hours

With STOP:

• S: Stop
• T: Search Grep: "login" → find login.ts → Read it → See session management pattern
• O: Logout should mirror login's session cleanup, just reverse
• P: Add logout() in same file, reuse clearSession() helper
• Result: 15 minutes, follows existing pattern

Example 2: Bug Fix

Task: "Fix: User can't update profile"

Without STOP: Add console.log everywhere, randomly change code

With STOP:

• S: Stop
• T: Find profile update code → Read it → Search for "validation" → Find validation middleware blocking update
• O: The bug isn't the update function, it's overly strict validation
• P: Relax validation rule, not rewrite update logic
• Result: Fix in 5 minutes

Example 3: Refactoring

Task: "Clean up this messy function"

Without STOP: Rewrite from scratch, break things

With STOP:

• S: Stop
• T: Read function → Trace all callers → Understand why it's complex (handles 7 edge cases)
• O: The complexity is necessary—refactor into smaller helpers but keep logic
• P: Extract 3 helper functions, preserve edge cases
• Result: Cleaner code, same functionality, no bugs

Edge Cases

"The codebase is too big/large/complex"

• Use STOP more, not less
• Start with the specific file/component
• Expand outward as needed

"I'm just adding a small one-line change"

• Especially then
• One-line changes often have hidden impact
• 2 minutes of tracing saves 2 hours of debugging

"It's new code, nothing exists yet"

• Trace similar patterns in the codebase
• Follow existing architecture
• Respect the conventions

"I'm the only one working on this"

• Doesn't matter
• Future you will thank present you
• Code is communication with your future self

"I'm in a rush"

• STOP saves time, doesn't cost it
• 15 minutes now > 3 hours of debugging later
• 韩非子: "欲速则不达" (Haste makes waste)

Integration into Workflow

Make it a habit:

1. Before every coding session

   • Literal trigger: Hands on keyboard → STOP
   • Mental trigger: "I'm about to code" → "Have I STOP'd?"

2. Code review checklist

   • "Did you STOP before coding?"
   • "Show me what you traced"

3. Pair programming

   • Driver and Navigator both STOP
   • Compare findings before implementing

4. Team culture

   • "Did you read the code?" > "Did you write the code?"
   • Celebrate thorough investigation over quick fixes

Common Anti-patterns

❌ "I'll just code it and see" - Gambling with time ❌ "The code is self-explanatory" - It's not, read it ❌ "I know this pattern" - This codebase might do it differently ❌ "Searching takes too long" - Debugging takes longer ❌ "I'm an expert, I don't need to read" - Experts read the most

The Mantra

不读就写，就是赌博 (Not reading before coding is gambling)

Every time you start coding without STOP, you're betting:

• The function doesn't already exist (it does)
• Your understanding is correct (it's not)
• Nothing will break (it will)

House always wins. STOP beats the house.

Quick Reference

S - Stop    (30 sec)   - Don't touch keyboard
T - Trace   (5-10 min) - Read existing code, find patterns
O - Orient  (2-3 min)  - Understand context, locate change
P - Plan    (1-2 min)  - Define approach, then code

Total time: 5-15 minutes Time saved: Hours of debugging, refactoring, and embarrassment

Bundled Resources

Advanced Tool Patterns

When you need detailed guidance on using Glob, Grep, Read, and LSP tools during the Trace phase, see references/tool-patterns.md.

Contains:

• Common search patterns for each tool
• Typical TRACE workflows with step-by-step examples
• Tool selection guide (when to use which tool)
• Pro tips and common pitfalls

When to read: You're in the Trace phase and want to maximize investigation efficiency.

Complex Scenarios

When dealing with large codebases, legacy code, microservices, or other complex situations, see references/complex-scenarios.md.

Contains:

• Large codebases (>100k lines): How to scope investigation
• Legacy code with no tests: Risk containment strategies
• Microservices: Mapping service boundaries
• Multiple valid approaches: Comparative analysis
• Emergency/hotfix: Focused investigation protocol
• Foreign codebases: Learning mode for new projects
• Performance optimization: Measure-first methodology

When to read: Your scenario doesn't fit the basic examples and needs adaptation.

Plan Template

When documenting your Plan phase, use the template at assets/plan-template.md.

Contains:

• Structured sections for documenting S-T-O-P findings
• Testing strategy checklist
• Rollback planning guide
• Execution log template
• Post-implementation review

When to use: You want to systematically document your investigation and plan.

Remember: The best code you write is the code you didn't have to write because you read it first.