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codex

@ashchupliak/dream-team
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Delegate coding tasks to Codex CLI (OpenAI gpt-5-codex via JetBrains AI). Use when a task involves repetitive code generation, refactoring, or analysis that can be offloaded.

Install Skill

1Download skill
2Enable skills in Claude

Open claude.ai/settings/capabilities and find the "Skills" section

3Upload to Claude

Click "Upload skill" and select the downloaded ZIP file

Note: Please verify skill by going through its instructions before using it.

SKILL.md

name codex
description Delegate coding tasks to Codex CLI (OpenAI gpt-5-codex via JetBrains AI). Use when a task involves repetitive code generation, refactoring, or analysis that can be offloaded.

Codex Skill - JetBrains AI Integration

Use Codex CLI to delegate coding tasks that benefit from parallel AI processing.

When to Use Codex

GOOD for Codex:

  • Large-scale refactoring across many files
  • Repetitive code generation (boilerplate, tests)
  • Code analysis and documentation
  • Pattern-based transformations
  • Exploring unfamiliar codebases

KEEP in Claude:

  • Complex architectural decisions
  • Security-sensitive code
  • Tasks requiring deep context understanding
  • Interactive problem-solving with user

Configuration

Codex is pre-configured with JetBrains AI staging:

  • Provider: jbai-staging
  • Models: gpt-4o-2024-11-20, o1-2024-12-17, o3-mini-2025-01-31

Usage Patterns

Quick Analysis (read-only)

codex exec -c model_provider=jbai-staging --model "gpt-4o-2024-11-20" \
  --sandbox read-only \
  "Analyze the codebase and list all REST endpoints" 2>/dev/null

Code Generation (workspace-write)

codex exec -c model_provider=jbai-staging --model "gpt-4o-2024-11-20" \
  --sandbox workspace-write --full-auto \
  "Generate unit tests for UserService.kt" 2>/dev/null

Heavy Reasoning (o1/o3 models)

codex exec -c model_provider=jbai-staging --model "o3-mini-2025-01-31" \
  --sandbox read-only \
  "Review security vulnerabilities in auth module" 2>/dev/null

Resume Previous Session

echo "continue with the refactoring" | codex exec --skip-git-repo-check resume --last 2>/dev/null

Decision Framework

Before delegating to Codex, consider:

Factor Use Codex Keep in Claude
File count Many files Few files
Task type Repetitive/mechanical Creative/strategic
Context needed Self-contained Requires conversation context
User interaction None needed Back-and-forth required

Execution Protocol

  1. Announce intent: Tell user you're delegating to Codex and why
  2. Choose model:
    • gpt-4o-2024-11-20 for fast tasks
    • o1-2024-12-17 / o3-mini-2025-01-31 for complex reasoning
  3. Choose sandbox:
    • read-only for analysis
    • workspace-write for edits
  4. Run command with 2>/dev/null to suppress thinking tokens
  5. Report results back to user
  6. Offer resume: "Say 'codex resume' to continue this session"

Safety Rules

  • Always use --skip-git-repo-check flag
  • Default to read-only sandbox unless edits needed
  • Never use danger-full-access without explicit user permission
  • Suppress stderr with 2>/dev/null by default