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/sd0xdev/sd0x-harness/codex-brainstormnpx skills add sd0xdev/sd0x-harness --skill codex-brainstormgit clone --depth 1 https://github.com/sd0xdev/sd0x-harnessWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sd0xdev/sd0x-harness/codex-brainstorm)<a href="https://agentmods.dev/skills/sd0xdev/sd0x-harness/codex-brainstorm"><img src="https://agentmods.dev/badge/skills/sd0xdev/sd0x-harness/codex-brainstorm.svg" alt="Measured on agentmods" height="20"></a>What 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 | $0.00056 | $0.00925 |
| Opus 5 | $0.00028 | $0.00463 |
| Sonnet 5 | $0.00011 | $0.00185 |
| Haiku 4.5 | $0.00006 | $0.00093 |
Grade A, and why
codex-brainstorm scanned grade A with 0 findings 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 3d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex Brainstorm Skill
Trigger
- Keywords: brainstorm, exhaust possibilities, explore solutions, deep discussion, feasibility analysis, solution exploration, Nash equilibrium
When NOT to Use
- Simple technical Q&A (answer directly)
- Already have a clear solution (implement directly)
- Only need code review (use
/codex-review)
Core Principle
⚠️ Independent Research → Adversarial Debate → Nash Equilibrium ⚠️
Nash Equilibrium = Neither party can unilaterally change strategy to achieve a better outcome
Workflow
| Phase | Action | Output |
|---|---|---|
| 1 | Claude independent research + analysis, forms Position A | Claude's optimal hypothesis |
| 2 | Codex independent research + analysis, forms Position B | Codex's optimal hypothesis |
| 3 | Multi-round adversarial debate, mutual attacks | Debate exchange record |
| 4 | Check equilibrium, no further improvements possible | Equilibrium or divergence |
| 5 | Output final report | Nash Equilibrium report |
Phase 2: Codex Independent Research (Critical)
⚠️ Must let Codex research independently; do NOT feed Claude's analysis results ⚠️
mcp__codex__codex({
prompt: `You are a senior architect. Conduct an **independent analysis** of the following topic.
## Topic
${TOPIC}
## Constraints
${CONSTRAINTS}
## ⚠️ Important: You must research independently ⚠️
Before forming conclusions, you **must** first:
1. Run \`ls src/\` to understand the directory structure
2. Search related code: \`grep -r "keyword" src/ --include="*.ts" -l | head -10\`
3. Read relevant files to confirm existing implementations
## Output Requirements
1. Research summary (related modules, existing patterns)
2. Your position + supporting arguments
3. Potential risks`,
sandbox: 'read-only',
'approval-policy': 'on-failure',
});
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.
- 3d ago First seen · 111 lines · 56 tokens per session scan A 04fdf651f943
codex-brainstorm is a skill published in the GitHub repository sd0xdev/sd0x-harness (188 stars, last pushed today), licensed MIT. It adds 56 tokens to every session and 925 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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