void-box: Instructions file for Codex

AGENTS.md

void-box AGENTS.md is an instructions file for Codex, OpenCode from the-void-ia/void-box. It costs 18,331 tokens per session, scanned B, original, Apache-2.0.

Project instructions for VoidBox, a lightweight micro-virtual-machine runtime that runs agents in isolated environments. They describe its architecture, design proposal process, code navigation, testing, commits, pull requests, and documentation style.

In plain words
What is it for?
Use them when working on VoidBox code, especially for navigating code with language-server tools, preparing design proposals, writing commits or pull requests, and documenting changes.
Why use it?
They give coding agents project-specific rules for making changes consistently and safely. They also explain when a larger change needs an RFC (a written proposal) and an ADR (a recorded architecture decision).

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions Claude Code; mentions AGENTS.md; mentions Codex.

This is the-void-ia/void-box's own configuration. It tells Codex and OpenCode how to work on void-box itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything void-box configures →

Reuse

Borrowing it

Nothing to install: this file belongs to the-void-ia/void-box. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/the-void-ia/void-box/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/the-void-ia/void-box

Made for: Codex, OpenCode.

Wrote 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.

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README.md
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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.

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Per session 18,331 This file is loaded in full into every session.
When invoked 18,331 The same file — it is already loaded in full.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 5.1 $0.18331 $0.18331
Opus 5.5 $0.07332 $0.07332
Sonnet 5.5 $0.03666 $0.03666
Haiku 4.5 $0.01833 $0.01833

Measured 2mo ago against content hash b1098f3e5c20, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

void-box 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 2mo 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

# sudo dnf install -y gcc-aarch64-linux-gnu sysroot-aarch64-fc43-glibc
AGENTS.md · 1,425 lines

How it starts

The opening of the file, as written. The whole thing — 1,425 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — VoidBox

VoidBox is a lightweight micro-VM runtime for sandboxed execution. It boots a guest agent from initramfs, optionally performs an OCI root switch, and exposes a host↔guest API over vsock. This file covers architecture, testing, validation, and debugging guidance for agents working on the project.

Design proposals: RFC + ADR process

Changes that are large, complex, cross-cutting, or that need peer review before commitment go through an RFC (proposal + discussion) in docs/rfc/; the resulting load-bearing decisions are recorded as ADRs (atomic, immutable, superseded-not-edited) in docs/adr/. Small, local, obvious changes skip the RFC and go straight to a PR. The full process — when to write an RFC, numbering, statuses, and templates — is documented once in docs/rfc/README.md.

Code intelligence

Always prefer LSP operations (goToDefinition, findReferences, hover, documentSymbol, workspaceSymbol, etc.) over Grep/Glob for code navigation. LSP provides compiler-aware results that understand types, scopes, and cross-file relationships. Fall back to Grep/Glob only for pattern-based searches LSP doesn't cover (comments, config files, non-Rust files).

Commit and PR messages

Write commit message bodies and pull-request descriptions as Markdown, with each paragraph on a single line — do not hard-wrap prose to a fixed column. The renderer (GitHub, git log viewers) wraps it for display; manual line breaks mid-paragraph render as ragged text and produce noisy diffs on edits. Keep the commit subject line short (~72 chars), and use blank lines to separate paragraphs and normal Markdown for lists. Reserve hard line breaks for content that is genuinely line-oriented (lists, tables, code blocks).

Do not add AI-agent attribution anywhere — no "Generated by"/"Co-Authored-By" tool credits, no session links, no "written with " notes — in commit messages, PR titles or descriptions, code, comments, or docs. The work stands on its own; tooling used to produce it is not part of the record.

Read the full file on GitHub · 1,425 lines

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. 2mo ago Changed · +3 lines · +228 tokens per session b1098f3e5c20
  2. 2mo ago First seen · 1,422 lines · 18,103 tokens per session scan B 26b029507c13

Subscribe to this mod's changes

void-box AGENTS.md is an instructions file published in the GitHub repository the-void-ia/void-box (89 stars, last pushed 4d ago), licensed Apache-2.0. It adds 18,331 tokens to every session, about $0.0733 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

void-box AGENTS.md compared with instructions from other repositories

void-box AGENTS.md next to 6 instructions from other repositories
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void-box AGENTS.mdthe-void-ia/void-boxInstructions file894d agoApache-2.0B18,331Codex, OpenCode
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vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode