Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/DNYoussef/context-cascadenpx agentmods add skills/dnyoussef/context-cascade/codex-safe-experimentWrote 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/dnyoussef/context-cascade/codex-safe-experiment)<a href="https://agentmods.dev/skills/dnyoussef/context-cascade/codex-safe-experiment"><img src="https://agentmods.dev/badge/skills/dnyoussef/context-cascade/codex-safe-experiment/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dnyoussef/context-cascade/codex-safe-experiment"><img src="https://agentmods.dev/badge/skills/dnyoussef/context-cascade/codex-safe-experiment.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00028 | $0.01406 |
| Opus 5.5 | $0.00011 | $0.00562 |
| Sonnet 5.5 | $0.00006 | $0.00281 |
| Haiku 4.5 | $0.00003 | $0.00141 |
Grade C, and why
codex-safe-experiment scanned grade C 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 1mo 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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
| Commands | Blocked: rm -rf, sudo, etc. | How it starts
The opening of the file, as written. The whole thing — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex Safe Experiment Skill
LIBRARY-FIRST PROTOCOL (MANDATORY)
Before writing ANY code, you MUST check:
Step 1: Library Catalog
- Location:
.claude/library/catalog.json - If match >70%: REUSE or ADAPT
Step 2: Patterns Guide
- Location:
.claude/docs/inventories/LIBRARY-PATTERNS-GUIDE.md - If pattern exists: FOLLOW documented approach
Step 3: Existing Projects
- Location:
D:\Projects\* - If found: EXTRACT and adapt
Decision Matrix
| Match | Action |
|---|---|
| Library >90% | REUSE directly |
| Library 70-90% | ADAPT minimally |
| Pattern exists | FOLLOW pattern |
| In project | EXTRACT |
| No match | BUILD (add to library after) |
Kanitsal Cerceve (Evidential Frame Activation)
Kaynak dogrulama modu etkin.
Purpose
Use Codex CLI's sandbox mode to experiment with risky changes in complete isolation. Network is disabled, only CWD is accessible, providing safe experimentation.
When to Use This Skill
- Risky refactoring that might break things
- Experimental approaches before committing
- Testing destructive operations safely
- Trying new libraries or patterns
- Major architectural changes
- Security-sensitive experiments
When NOT to Use This Skill
- Simple, low-risk changes
- When network access is needed
- When accessing files outside project
- Production debugging
- Quick fixes (use codex-iterative-fix)
Workflow
Phase 1: Experiment Design
- Define what you want to try
- Identify risk factors
- Plan verification steps
- Set success criteria
Phase 2: Sandbox Execution
# Full sandbox mode (network disabled, CWD only)
./scripts/multi-model/codex-yolo.sh "Refactor auth system" task-id "." 10 sandbox
# Via delegate.sh
./scripts/multi-model/delegate.sh codex "Try experimental approach" --sandbox
# Direct Codex
bash -lc "codex --full-auto --sandbox true --network disabled exec 'Experiment with X'"
Phase 3: Evaluation
- Review what Codex tried
- Evaluate if experiment succeeded
- Decide: Apply to real codebase?
- If yes: Apply changes outside sandbox
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.
- 1mo ago First seen · 236 lines · 28 tokens per session scan C c4e13de51e12
codex-safe-experiment is a skill published in the GitHub repository DNYoussef/context-cascade (32 stars, last pushed 3mo ago), licensed MIT. It adds 28 tokens to every session and 1,406 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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