Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/xiaolai/vmark/ai-coding-agentsnpx skills add xiaolai/vmark --skill ai-coding-agentsgit clone --depth 1 https://github.com/xiaolai/vmarkWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00050 | $0.04229 |
| Opus 5 | $0.00025 | $0.02115 |
| Sonnet 5 | $0.00010 | $0.00846 |
| Haiku 4.5 | $0.00005 | $0.00423 |
Grade B, and why
ai-coding-agents scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
### Configuration (`~/.codex/config.toml`) How it starts
The opening of the file, as written. The whole thing — 571 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AI Coding Agents Skill
Expert knowledge for Codex CLI and Claude Code CLI — the two leading AI coding agents.
Note: This skill documents both tools for reference. VMark development primarily uses Claude Code CLI. The Codex CLI sections are retained for completeness and cross-tool workflows.
When to Use
- Orchestrating complex coding tasks via CLI
- Configuring MCP servers for either tool
- Setting up automation pipelines (CI/CD)
- Troubleshooting authentication or sandbox issues
- Comparing capabilities between agents
- Custom agent/subagent configuration
Quick Reference
Starting Sessions
| Task | Codex CLI | Claude Code CLI |
|---|---|---|
| Interactive session | codex |
claude |
| With prompt | codex "fix the bug" |
claude "fix the bug" |
| Non-interactive | codex exec "task" |
claude -p "task" |
| Resume last | codex resume --last |
claude -c |
| Resume by ID | codex resume <id> |
claude -r <id> |
Safety Modes
| Mode | Codex CLI | Claude Code CLI |
|---|---|---|
| Read-only | -s read-only |
--permission-mode plan |
| Workspace write | -s workspace-write |
(default) |
| Full access | -s danger-full-access |
--dangerously-skip-permissions |
| Auto mode | --full-auto |
--permission-mode default |
| YOLO mode | --yolo |
--dangerously-skip-permissions |
Model Selection
| Task | Codex CLI | Claude Code CLI |
|---|---|---|
| Select model | -m gpt-5-codex |
--model opus |
| Use local OSS | --oss |
N/A |
| Fallback model | N/A | --fallback-model sonnet |
Codex CLI (OpenAI)
Installation
npm i -g @openai/codex
# or
brew install --cask codex
Authentication
codex login # OAuth via ChatGPT
codex login --with-api-key # Read API key from stdin
codex login status # Check auth status
codex logout # Remove credentials
Core Commands
codex - Interactive Mode
codex # Start TUI
codex "fix all TypeScript errors" # With initial prompt
codex -i screenshot.png "explain" # With image
codex --full-auto "refactor" # Low-friction mode
codex --search "find docs" # Enable web search
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 571 lines · 50 tokens per session scan B bcf0c5d17906
ai-coding-agents is a skill published in the GitHub repository xiaolai/vmark (544 stars, last pushed 3d ago), licensed ISC. It adds 50 tokens to every session and 4,229 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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