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 agents/pegasi-ai/reins/codexgit clone --depth 1 https://github.com/pegasi-ai/reinsWhat 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 | $0.00000 | $0.00258 |
| Opus 5 | $0.00000 | $0.00129 |
| Sonnet 5 | $0.00000 | $0.00052 |
| Haiku 4.5 | $0.00000 | $0.00026 |
Grade A, and why
codex 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 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.
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.
What it actually says
ToolShield + Codex
Codex is OpenAI's CLI coding agent. ToolShield injects safety guidelines into its global instruction file.
How It Works
ToolShield appends guidelines to ~/.codex/AGENTS.md, which Codex loads as persistent agent instructions.
Import
toolshield import \
--exp-file postgres-mcp.json \
--agent codex
You can import multiple tools — each appends to the same file:
toolshield import --exp-file terminal-mcp.json --agent codex
toolshield import --exp-file filesystem-mcp.json --agent codex
Unload
toolshield unload --agent codex
This removes all ToolShield-injected guidelines while preserving your existing AGENTS.md content.
File Location
| Platform | Path |
|---|---|
| All | ~/.codex/AGENTS.md |
Custom Location
If your AGENTS.md is in a non-default location:
toolshield import --exp-file <path> --agent codex --source_location /path/to/AGENTS.md
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 · 45 lines · 0 tokens per session scan A f426cb8fe759
codex is an agent published in the GitHub repository pegasi-ai/reins (408 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 258 tokens. 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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