agentic-sandbox AGENTS.md

Repository instructions that tell coding agents how the jmagly/agentic-sandbox project is organized and worked on.

In plain words
What is it for?
Understanding the codebase, its technology choices, development commands, and file structure.
Why use it?
They give an agent the project context and required commands, reducing guesswork when making changes.

Instructions file for CodexOpenCode

Install

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.

agentmods
npx agentmods add instructions/jmagly/agentic-sandbox/agents-md
Clone the repo
git clone --depth 1 https://github.com/jmagly/agentic-sandbox

Made for: Codex, OpenCode.

Per session 2,449 This file is loaded in full into every session.
When invoked 2,449 The same file — it is already loaded in full.
Security scan B 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.02449 $0.02449
Opus 5 $0.01224 $0.01224
Sonnet 5 $0.00490 $0.00490
Haiku 4.5 $0.00245 $0.00245

Measured 3d ago against content hash 9bc88538c268, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

agentic-sandbox AGENTS.md 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 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

| Codex | `~/.codex/config` | `AGENTS.md` |
AGENTS.md · 258 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

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.

  1. 3d ago First seen · 258 lines · 2,449 tokens per session scan B 9bc88538c268

Subscribe to this mod's changes

agentic-sandbox AGENTS.md is an instructions file published in the GitHub repository jmagly/agentic-sandbox (11 stars, last pushed 3d ago), licensed AGPL-3.0. It adds 2,449 tokens to every session, about $0.0122 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.