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Codex Safe Experiment Skill

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LIBRARY-FIRST PROTOCOL (MANDATORY)

Before writing ANY code, you MUST check:

Step 1: Library Catalog

• Location:

  .claude/library/catalog.json

• If match >70%: REUSE or ADAPT

Step 2: Patterns Guide

• Location:

  .claude/docs/inventories/LIBRARY-PATTERNS-GUIDE.md

• If pattern exists: FOLLOW documented approach

Step 3: Existing Projects

• Location:

  D:\Projects\*

• If found: EXTRACT and adapt

Decision Matrix

Match	Action
Library >90%	REUSE directly
Library 70-90%	ADAPT minimally
Pattern exists	FOLLOW pattern
In project	EXTRACT
No match	BUILD (add to library after)

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Kanitsal Cerceve (Evidential Frame Activation)

Kaynak dogrulama modu etkin.

Purpose

Use Codex CLI's sandbox mode to experiment with risky changes in complete isolation. Network is disabled, only CWD is accessible, providing safe experimentation.

When to Use This Skill

• Risky refactoring that might break things
• Experimental approaches before committing
• Testing destructive operations safely
• Trying new libraries or patterns
• Major architectural changes
• Security-sensitive experiments

When NOT to Use This Skill

• Simple, low-risk changes
• When network access is needed
• When accessing files outside project
• Production debugging
• Quick fixes (use codex-iterative-fix)

Workflow

Phase 1: Experiment Design

1. Define what you want to try
2. Identify risk factors
3. Plan verification steps
4. Set success criteria

Phase 2: Sandbox Execution

# Full sandbox mode (network disabled, CWD only)
./scripts/multi-model/codex-yolo.sh "Refactor auth system" task-id "." 10 sandbox

# Via delegate.sh
./scripts/multi-model/delegate.sh codex "Try experimental approach" --sandbox

# Direct Codex
bash -lc "codex --full-auto --sandbox true --network disabled exec 'Experiment with X'"

Phase 3: Evaluation

1. Review what Codex tried
2. Evaluate if experiment succeeded
3. Decide: Apply to real codebase?
4. If yes: Apply changes outside sandbox

Sandbox Isolation Layers

Layer	Protection
Network	DISABLED - no external connections
Filesystem	CWD only - no parent access
OS-Level	Seatbelt (macOS) / Docker
Commands	Blocked: rm -rf, sudo, etc.

Success Criteria

• Experiment ran safely in sandbox
• Results evaluated
• Decision made: apply or discard
• No unintended side effects

Example Usage

Example 1: Major Refactoring

User: "Refactor entire auth system to use new pattern"

Sandbox Process:
1. Clone relevant files to sandbox context
2. Codex implements new pattern
3. Run tests in sandbox
4. Evaluate results
5. If good: Apply to real codebase

Output:
- Experiment: Success
- Tests: 45/47 passing (2 need adjustment)
- Recommendation: Apply with minor fixes

Example 2: Library Migration

User: "Try migrating from moment.js to dayjs"

Sandbox Process:
1. Install dayjs in sandbox
2. Replace moment calls
3. Run tests
4. Compare bundle size

Output:
- Migration: Feasible
- Breaking changes: 3 date format strings
- Bundle reduction: 65KB
- Recommendation: Proceed with migration

Integration with Meta-Loop

META-LOOP IMPLEMENT PHASE:
    |
    +---> High-risk change detected
    |         |
    |         +---> codex-safe-experiment
    |         |         |
    |         |         +---> Sandbox: Try change
    |         |         +---> Evaluate: Success?
    |         |         +---> If yes: Apply for real
    |         |
    |         +---> Continue to TEST phase

Memory Integration

Results stored at:

• Key:

  multi-model/codex/experiment/{project}/{task_id}

• Tags: WHO=codex-safe-experiment, WHY=sandboxed-trial
• Contains: Experiment results, recommendation, diffs

Invocation Pattern

# Via router with experiment keywords
./scripts/multi-model/multi-model-router.sh "Try refactoring X approach"

# Direct sandbox mode
bash -lc "codex --sandbox workspace-write exec 'Experiment with X'"

Guardrails

NEVER:

• Apply sandbox results without review
• Skip the evaluation phase
• Use sandbox for production debugging
• Trust sandbox results blindly

ALWAYS:

• Review sandbox diffs before applying
• Document what was tried
• Store results for future reference
• Have rollback plan ready

Decision Framework

Experiment Result	Action
All tests pass	Apply changes
Minor failures	Fix then apply
Major failures	Discard, try different approach
Unexpected behavior	Investigate before deciding

Related Skills

• codex-iterative-fix

  : After experiment, for cleanup

• codex-audit

  : Audit experimental changes

• testing-quality

  : Generate tests for experiments

• llm-council

  : Decide on experimental approaches

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Verification Checklist

• Experiment ran in sandbox
• Results captured and evaluated
• Decision documented
• If applied: Changes verified
• Memory-MCP updated

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[commit|confident] <promise>CODEX_SAFE_EXPERIMENT_COMPLETE</promise>