Codex Subagents

Source: https://github.com/VoltAgent/awesome-codex-subagents at 16f880a2a048
License: MIT
Read the English original

The awesome collection of 175+ Codex subagents across 13 categories.

Awesome Codex Subagents

This repository serves as the definitive collection of Codex Subagents, specialized AI assistants designed for specific development tasks. Written specifically for Codex and aligned with the official docs.

Installation

Use Codex custom agent directories exactly as documented:

• ~/.codex/agents/ for global agents (available in all projects)
• .codex/agents/ for project-specific agents (higher precedence in that repo)

1. Clone this repository.
2. Copy the .toml agent files you want into one of the directories above.
3. Restart or refresh your Codex session if needed.
4. Delegate explicitly in prompts (Codex does not auto-spawn custom subagents).

Examples:

mkdir -p ~/.codex/agents
cp categories/01-core-development/backend-developer.toml ~/.codex/agents/

mkdir -p .codex/agents
cp categories/04-quality-security/reviewer.toml .codex/agents/

If you use agent configuration in Codex, keep it in .codex/config.toml under [agents] as described in the official docs.

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Subagent Storage Locations

Type	Path	Availability	Precedence
Project Subagents	.codex/agents/	Current project only	Higher
Global Subagents	~/.codex/agents/	All projects	Lower

Note: When naming conflicts occur, project-specific subagents override global ones.

Subagent Structure

Each subagent uses a Codex-native .toml format:

name = "subagent-name"
description = "When this agent should be invoked"
model = "gpt-5.6-luna"
model_reasoning_effort = "medium"
sandbox_mode = "read-only"

[instructions]
text = """
You are a [role description and expertise areas]...

[Agent-specific checklists, patterns, and guidelines]...
"""

Smart Model Routing

Each subagent includes a model field that automatically routes it to the right model — balancing quality and cost:

Model	When It’s Used	Examples
gpt-5.6-sol	Deep reasoning — architecture reviews, security audits, financial logic	security-auditor, architect-reviewer, fintech-engineer
gpt-5.6-terra	Implementation, diagnostics, evaluation, and multi-step professional analysis	docker-expert, test-automator, scientific-literature-researcher
gpt-5.6-luna	Bounded search, extraction, routing, drafting, and lightweight synthesis	search-specialist, docs-researcher, agent-installer

Sandbox Mode Philosophy

Each subagent’s sandbox_mode field controls filesystem access:

• Read-only agents (reviewers, auditors): sandbox_mode = "read-only" - analyze without modifying
• Workspace-write agents (developers, engineers): sandbox_mode = "workspace-write" - create and modify files

Categories

01. Core Development

Essential development subagents for everyday coding tasks.

• api-designer - REST and GraphQL API architect
• backend-developer - Server-side expert for scalable APIs
• code-mapper - Code path mapping and ownership boundary analysis
• design-bridge - Translates DESIGN.md specs into implementation-ready UI instructions
• electron-pro - Desktop application expert
• frontend-developer - UI/UX specialist for React, Vue, and Angular
• fullstack-developer - End-to-end feature development
• graphql-architect - GraphQL schema and federation expert
• microservices-architect - Distributed systems designer
• mobile-developer - Cross-platform mobile specialist
• ui-designer - Visual design and interaction specialist
• ui-fixer - Smallest safe patch for reproduced UI issues
• websocket-engineer - Real-time communication specialist

02. Language Specialists

Language-specific experts with deep framework knowledge.

• angular-architect - Angular 15+ enterprise patterns expert
• cpp-pro - C++ performance expert
• csharp-developer - .NET ecosystem specialist
• django-developer - Django 4+ web development expert
• dotnet-core-expert - .NET 8 cross-platform specialist
• dotnet-framework-4.8-expert - .NET Framework legacy enterprise specialist
• elixir-expert - Elixir and OTP fault-tolerant systems expert
• erlang-expert - Erlang/OTP and rebar3 engineering expert
• expo-react-native-expert - Expo and React Native mobile development expert
• fastapi-developer - Modern async Python API framework expert
• flutter-expert - Flutter 3+ cross-platform mobile expert
• golang-pro - Go concurrency specialist
• java-architect - Enterprise Java expert
• javascript-pro - JavaScript development expert
• kotlin-specialist - Modern JVM language expert
• laravel-specialist - Laravel 10+ PHP framework expert
• symfony-specialist - Symfony application and Doctrine specialist
• nextjs-developer - Next.js 14+ full-stack specialist
• node-specialist - Node.js backend specialist
• php-pro - PHP web development expert
• powershell-5.1-expert - Windows PowerShell 5.1 and full .NET Framework automation specialist
• powershell-7-expert - Cross-platform PowerShell 7+ automation and modern .NET specialist
• python-pro - Python ecosystem master
• rails-expert - Rails 8.1 rapid development expert
• react-specialist - React 18+ modern patterns expert
• rust-engineer - Systems programming expert
• spring-boot-engineer - Spring Boot 3+ microservices expert
• sql-pro - Database query expert
• swift-expert - iOS and macOS specialist
• typescript-pro - TypeScript specialist
• vue-expert - Vue 3 Composition API expert

03. Infrastructure

DevOps, cloud, and deployment specialists.

• azure-infra-engineer - Azure infrastructure and Az PowerShell automation expert
• cloud-architect - AWS/GCP/Azure specialist
• database-administrator - Database management expert
• deployment-engineer - Deployment automation specialist
• devops-engineer - CI/CD and automation expert
• devops-incident-responder - DevOps incident management
• docker-expert - Docker containerization and optimization expert
• incident-responder - System incident response expert
• kubernetes-specialist - Container orchestration master
• network-engineer - Network infrastructure specialist
• platform-engineer - Platform architecture expert
• security-engineer - Infrastructure security specialist
• sre-engineer - Site reliability engineering expert
• terraform-engineer - Infrastructure as Code expert
• terragrunt-expert - Terragrunt orchestration and DRY IaC specialist
• windows-infra-admin - Active Directory, DNS, DHCP, and GPO automation specialist

04. Quality & Security — Testing, security, and code quality experts (20 agents)

04. Quality & Security

• accessibility-tester - A11y compliance expert
• ad-security-reviewer - Active Directory security and GPO audit specialist
• anti-ui-slop-reviewer - Product-specific UI finish-gate reviewer
• ai-writing-auditor - AI writing pattern auditor and rewriter
• architect-reviewer - Architecture review specialist
• browser-debugger - Browser-based reproduction and client-side debugging
• chaos-engineer - System resilience testing expert
• code-reviewer - Code quality guardian
• compliance-auditor - Regulatory compliance expert
• debugger - Advanced debugging specialist
• error-detective - Error analysis and resolution expert
• gdpr-ccpa-compliance - GDPR and CCPA privacy compliance specialist
• penetration-tester - Ethical hacking specialist
• performance-engineer - Performance optimization expert
• powershell-security-hardening - PowerShell security hardening and compliance specialist
• qa-expert - Test automation specialist
• reviewer - PR-style review for correctness, security, and regressions
• security-auditor - Security vulnerability expert
• test-automator - Test automation framework expert
• ui-ux-tester - Exhaustive UI/UX functional testing specialist

05. Data & AI — Data engineering, ML, and AI specialists (14 agents)

05. Data & AI

• ai-engineer - AI system design and deployment expert
• azure-databricks-platform-architect - Azure Databricks platform and lakehouse architect
• data-analyst - Data insights and visualization specialist
• data-engineer - Data pipeline architect
• data-scientist - Analytics and insights expert
• database-optimizer - Database performance specialist
• llm-architect - Large language model architect
• machine-learning-engineer - Machine learning systems expert
• ml-engineer - Machine learning specialist
• mlops-engineer - MLOps and model deployment expert
• nlp-engineer - Natural language processing expert
• postgres-pro - PostgreSQL database expert
• prompt-engineer - Prompt optimization specialist
• reinforcement-learning-engineer - Reinforcement learning and decision systems expert

06. Developer Experience — Tooling and developer productivity experts (14 agents)

06. Developer Experience

• build-engineer - Build system specialist
• cli-developer - Command-line tool creator
• dependency-manager - Package and dependency specialist
• documentation-engineer - Technical documentation expert
• dx-optimizer - Developer experience optimization specialist
• git-workflow-manager - Git workflow and branching expert
• legacy-modernizer - Legacy code modernization specialist
• mcp-developer - Model Context Protocol specialist
• powershell-module-architect - PowerShell module and profile architecture specialist
• powershell-ui-architect - PowerShell UI/UX specialist for WinForms, WPF, Metro frameworks, and TUIs
• readme-generator - Maintainer-ready README generator with zero hallucination
• refactoring-specialist - Code refactoring expert
• slack-expert - Slack platform and @slack/bolt specialist
• tooling-engineer - Developer tooling specialist

07. Specialized Domains — Domain-specific technology experts (14 agents)

07. Specialized Domains

• api-documenter - API documentation specialist
• blockchain-developer - Web3 and crypto specialist
• embedded-systems - Embedded and real-time systems expert
• fintech-engineer - Financial technology specialist
• game-developer - Game development expert
• healthcare-admin - Healthcare administration, revenue cycle, and compliance specialist
• hipaa-compliance - HIPAA compliance specialist for healthcare SaaS vendors
• iot-engineer - IoT systems developer
• m365-admin - Microsoft 365, Exchange Online, Teams, and SharePoint administration specialist
• mobile-app-developer - Mobile application specialist
• payment-integration - Payment systems expert
• quant-analyst - Quantitative analysis specialist
• risk-manager - Risk assessment and management expert
• seo-specialist - Search engine optimization expert

08. Business & Product — Product management and business analysis (17 agents)

08. Business & Product

• assumption-mapping - Product assumption risk and validation specialist
• backlog-grooming - Agile backlog refinement specialist
• business-analyst - Requirements specialist
• content-marketer - Content marketing specialist
• content-quality-editor - AI content quality and humanization specialist
• customer-success-manager - Customer success expert
• growth-loops - Growth loop and PLG mechanics specialist
• legal-advisor - Legal and compliance specialist
• license-engineer - Software licensing and compliance systems specialist
• product-manager - Product strategy expert
• project-manager - Project management specialist
• resume-refiner - Resume, CV, and LinkedIn profile optimization specialist
• sales-engineer - Technical sales expert
• scrum-master - Agile methodology expert
• technical-writer - Technical documentation specialist
• ux-researcher - User research expert
• wordpress-master - WordPress development and optimization expert

09. Meta & Orchestration — Agent coordination and meta-programming (12 agents)

09. Meta & Orchestration

• agent-installer - Browse and install agents from this repository via GitHub
• agent-organizer - Multi-agent coordinator
• codebase-orchestrator - Repo-wide refactor governance with approval gates
• context-manager - Context optimization expert
• error-coordinator - Error handling and recovery specialist
• it-ops-orchestrator - IT operations workflow orchestration specialist
• knowledge-synthesizer - Knowledge aggregation expert
• multi-agent-coordinator - Advanced multi-agent orchestration
• performance-monitor - Agent performance optimization
• pied-piper - Orchestrate Team of AI Subagents for repetitive SDLC workflows
• task-distributor - Task allocation specialist
• workflow-orchestrator - Complex workflow automation

10. Research & Analysis — Research, search, and analysis specialists (12 agents)

10. Research & Analysis

• ab-test-analysis - A/B test interpretation and ship/no-ship decisions
• cohort-analysis - Retention, cohort behavior, and activation-metric analysis
• competitive-analyst - Competitive intelligence specialist
• data-researcher - Data discovery and analysis expert
• docs-researcher - Documentation-backed API and framework verification
• first-principles-thinking - Assumption-challenging, first-principles problem solving
• market-researcher - Market analysis and consumer insights
• project-idea-validator - Brutal idea pressure-tester and go/no-go strategist
• research-analyst - Comprehensive research specialist
• scientific-literature-researcher - Evidence-grounded research from published scientific studies
• search-specialist - Advanced information retrieval expert
• trend-analyst - Emerging trends and forecasting expert

11. AI Governance & Safety - Governance, guardrails, and trustworthy AI specialists (4 agents)

11. AI Governance & Safety

• ai-governance-auditor - AI governance controls and deployment readiness reviewer
• model-risk-manager - Model failure-mode prioritization and mitigation specialist
• policy-guardrail-designer - Prompt, tool, and workflow guardrail designer
• responsible-ai-reviewer - Fairness, misuse, transparency, and oversight reviewer

12. Platform Engineering & IDP - Internal developer platform and golden-path specialists (4 agents)

12. Platform Engineering & IDP

• backstage-specialist - Backstage catalog, templates, and portal specialist
• golden-path-designer - Opinionated self-service workflow designer
• idp-architect - Internal developer platform architecture specialist
• platform-product-manager - Platform roadmap, adoption, and success-metrics specialist

13. LLMOps, Evals & Observability - Production AI quality and runtime visibility specialists (4 agents)

13. LLMOps, Evals & Observability

• ai-observability-engineer - AI-native traces, metrics, and logging specialist
• eval-engineer - Prompt, tool, and workflow evaluation specialist
• hallucination-investigator - Factuality and context-breakdown root-cause investigator
• prompt-regression-tester - Regression-suite designer for AI behavior changes

Understanding Subagents

Subagents are specialized AI assistants that enhance Codex’s capabilities by providing task-specific expertise. They act as dedicated helpers that Codex can call upon when encountering particular types of work.

What Makes Subagents Special?

Independent Context Windows Every subagent operates within its own isolated context space, preventing cross-contamination between different tasks and maintaining clarity in the primary conversation thread.

Domain-Specific Intelligence Subagents come equipped with carefully crafted instructions tailored to their area of expertise, resulting in superior performance on specialized tasks.

Shared Across Projects After creating a subagent, you can utilize it throughout various projects and distribute it among team members to ensure consistent development practices.

Explicit Delegation Codex does not spawn subagents automatically. Use explicit delegation prompts to specify which agents to spawn, how to divide the work, and what shape the result should take.

Core Advantages

• Memory Efficiency: Isolated contexts prevent the main conversation from becoming cluttered with task-specific details
• Enhanced Accuracy: Specialized prompts and configurations lead to better results in specific domains
• Workflow Consistency: Team-wide subagent sharing ensures uniform approaches to common tasks
• Codex-Native: Uses .toml agent files aligned with official Codex subagent docs

Example Workflows

PR review workflow:

Review this branch with parallel subagents. Have reviewer look for correctness, security, and missing tests. Have docs_researcher verify the framework APIs this patch depends on. Wait for both and summarize the findings with file references.

Bug investigation workflow:

Investigate the broken settings flow. Have code_mapper trace the owning code paths, browser_debugger reproduce the bug in the browser, and frontend_developer propose the smallest fix after the failure is understood. Wait for the read-heavy agents first, then continue.

Repo exploration and planning workflow:

Use search_specialist to locate the code related to payment retries, knowledge_synthesizer to summarize the current design, and refactoring_specialist to propose a minimal refactor plan. Return a concrete action list.

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Contributing

We welcome contributions! See CONTRIBUTING.md for guidelines.

• Submit new subagents via PR
• Improve existing definitions
• Report issues and bugs

License

MIT License - see LICENSE

This repository is a curated collection of subagent definitions contributed by both the maintainers and the community. All subagents are provided “as is” without warranty. We do not audit or guarantee the security or correctness of any subagent. Review before use, the maintainers accept no liability for any issues arising from their use.

If you find an issue with a listed subagent or want your contribution removed, please open an issue in this repository and we’ll address it promptly.