Codex Delegation Criteria

Decision framework for routing tasks between Claude Code and OpenAI's Codex agent.

Overview

Claude Code and Codex have complementary strengths. Claude excels at interactive, exploratory work requiring judgment. Codex excels at bounded, well-defined tasks that can run asynchronously. Effective delegation maximizes throughput by matching tasks to the right agent.

Quick Decision Matrix

When to Delegate to Codex

Strong Codex Candidates

QA Tasks

• Run linters and fix violations
• Add test coverage to existing code
• Code review with specific checklist
• Security audit for known patterns

Clearly-Scoped Bug Fixes

• Issue has clear reproduction steps
• Fix location is known or obvious
• Success criteria are testable
• No architectural decisions needed

Repetitive Multi-File Changes

• Rename across codebase
• Add consistent error handling
• Update import paths
• Apply pattern to multiple files

Background Work

• Tasks that don't block current flow
• Work that can be reviewed later
• Parallel workstreams

Codex Task Characteristics

• Has a GitHub issue or clear spec
• Can be described in a CTM (Codex Task Manifest)
• Success is objectively verifiable
• Scope fits in a single PR
• No conversation needed during execution

When to Keep in Claude

Strong Claude Candidates

Architecture and Design

• System design decisions
• API design choices
• Trade-off analysis
• Refactoring strategy

Exploratory Work

• Debugging without clear cause
• Investigation and research
• Prototyping approaches
• Understanding unfamiliar code

Interactive Tasks

• Work requiring clarification
• Iterative refinement
• Real-time feedback loops
• Teaching and explanation

Urgent Work

• Blocking other tasks
• Part of active development flow
• Needs immediate feedback
• Time-sensitive fixes

Claude Task Characteristics

• Requires judgment or creativity
• Benefits from conversation
• Needs context from current session
• Urgency doesn't allow 5-30 min wait
• Scope is unclear or evolving

Decision Process

Step 1: Check Urgency

Is this blocking your current work?
├── Yes → Keep in Claude
└── No → Continue to Step 2

Step 2: Check Scope Clarity

Can you write a clear CTM with:
- Specific success criteria
- Defined file scope
- Testable outcome
├── Yes → Continue to Step 3
└── No → Keep in Claude

Step 3: Check Iteration Need

Will this likely need back-and-forth?
├── Yes → Keep in Claude
└── No → Continue to Step 4

Step 4: Check Complexity

Could a competent junior dev do this with clear instructions?
├── Yes → Delegate to Codex
└── No → Keep in Claude

Proactive Delegation Triggers

Claude should suggest Codex delegation when detecting:

Language Patterns

• "Fix all the lint errors in..."
• "Add tests for..."
• "Review this code for..."
• "Update all files that..."
• "Rename X to Y across..."

Task Patterns

• Multiple files need same change
• Task matches existing GitHub issue
• Request is well-specified with clear criteria
• Task is independent of current conversation
• User mentions "background" or "later"

Context Patterns

• User is in a flow working on something else
• Task is tangential to main work
• Output is a PR (not explanation)
• Success is binary (works/doesn't)

Delegation Workflow

When delegating to Codex:

1. Confirm with user: "This looks like a good Codex task. Want me to submit it?"
2. Generate CTM: Create Codex Task Manifest from task details
3. Show CTM for review: Let user approve or adjust
4. Submit via /codex:submit: Hand off to Codex
5. Continue other work: Don't block on Codex completion
6. Check later: Use /codex:status to monitor

Anti-Patterns

Don't Delegate

• Tasks requiring access to conversation context
• Work that needs Claude's tool access (Codex is sandboxed)
• Anything involving secrets or credentials
• Tasks where you're unsure of the approach
• Work that would be faster to just do

Don't Keep

• Simple, well-defined tasks just because they're "easy"
• Repetitive work that could run in background
• QA tasks that don't need judgment
• Work blocking you from higher-value tasks

Examples

Delegate to Codex

User: "Can you add test coverage for the new handler?"
→ Clear scope, QA task, can run async
→ Suggest: "This is a good Codex task. Generate CTM?"

User: "Fix all the golangci-lint errors"
→ Well-defined, repetitive, objectively complete
→ Suggest: "Perfect for Codex. Submit now?"

User: "Review the PR for security issues"
→ Checklist-based, bounded scope
→ Suggest: "Codex can handle this review"

Keep in Claude

User: "How should we structure the new API?"
→ Architecture decision, needs discussion
→ Handle directly, don't suggest Codex

User: "Debug why this test is flaky"
→ Investigation needed, unclear scope
→ Handle directly, explore interactively

User: "I need this fix in the next 5 minutes"
→ Urgent, can't wait for Codex
→ Handle directly, prioritize speed

Integration with Orca

Tasks delegated to Codex often map to:

• GitHub issues: Use issue number in CTM
• Task nugs: Extract task details from nugget
• Friction reports: Codex PRs generate learning

After Codex completes, friction reports can be mined into Orca traps and rules for continuous improvement.