agent-glovebox: Instructions file for Claude Code

CLAUDE.md

agent-glovebox CLAUDE.md is an instructions file for Claude Code from AlexanderMattTurner/agent-glovebox. It costs 16,835 tokens per session, scanned D, original, Apache-2.0.

A project guidance file for Glovebox, a sandbox that lets coding agents run with isolated environments and safety checks. It points to additional instructions for specific files and tasks.

In plain words
What is it for?
Use it to understand the repository’s working style, safety controls, coding rules, shell rules, and instructions for areas such as CI workflows and agent prompts.
Why use it?
It gives an agent the rules it needs to work consistently and safely across the repository without putting every instruction in one file.

Instructions file for Claude Code

Written for Claude Code: PreToolUse hook event. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions subagents.

This is AlexanderMattTurner/agent-glovebox's own configuration. It tells Claude Code how to work on agent-glovebox 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 agent-glovebox configures →

Reuse

Borrowing it

Nothing to install: this file belongs to AlexanderMattTurner/agent-glovebox. 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/AlexanderMattTurner/agent-glovebox/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/AlexanderMattTurner/agent-glovebox

Made for: Claude Code.

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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Your own site
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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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Your own site · 80×15
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Per session 16,835 This file is loaded in full into every session.
When invoked 16,835 The same file — it is already loaded in full.
Security scan D 3 findings. 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 $0.16835 $0.16835
Opus 5.5 $0.06734 $0.06734
Sonnet 5.5 $0.03367 $0.03367
Haiku 4.5 $0.01683 $0.01683

Measured yesterday against content hash 018d7e97326d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade D, and why

agent-glovebox CLAUDE.md scanned grade D with 3 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 yesterday.

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.

- **Fix the cause, not the instance.** A re-run, a re-dispatch, a retry, a widened matcher or a longer timeout each leaves the cause reachable. Name the mechanism that produced the wrong answer, then change that mechanis

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

**A RED CHECK'S LOG ALREADY NAMES WHAT FAILED — READ IT, and run NOTHING locally to find out.** The [`ci-triage` skill](.claude/skills/ci-triage/SKILL.md) owns the routes to it. Run the targeted test only AFTER the log n

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

On the host, never run `rm -rf`. Use a unique scratch directory under `/tmp/claude`. **A WORKTREE goes under `/tmp/claude-worktrees` instead, created with `umask 002`.** `/tmp/claude` is closed to other users (0700 on th
CLAUDE.md · 285 lines

How it starts

The opening of the file, as written. The whole thing — 285 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

glovebox wraps a coding agent in a sandbox you can leave running unattended: a signed-image microVM (the Kata backend) with an outgoing-traffic firewall, a second model watching the tool stream, and guardrail hooks that gate each tool call. Every layer that judges a tool call fails closed; the skill-gate reminders, which only say what to read first, do not. Most of this repo is that machinery plus the CI that proves it still engages.

Where the rest of the guidance lives

This file carries only what applies to every session.

Surface Loads when Owns
.github/CLAUDE.md you open a file under .github/ workflow authoring: job naming, externalized run: scripts, paths:/reporter/concurrency mechanics, required-check sync, no-conditional-checks
.claude/rules/ you open a file its paths: glob matches code-style.md (any source file), shell-style.md, python-style.md, changelog.md, sandbox-runtime.md, hooks-control-plane.md, prompt-authoring.md (this file, a rule, a skill, an agent prompt), and the rest
.claude/skills/ you invoke it (some are forced by a gate-*-skill PreToolUse hook) the mechanics of an activity: pr-creation, git-workflow, babysit-prs, ci-triage, writing-tests, defect-to-guard, explore-plan, doctrine-capture (a capitalised NEVER or ALWAYS, or a complaint about how the session ran)

Read the full file on GitHub · 285 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. yesterday Changed · +46 tokens per session 018d7e97326d
  2. 3d ago Changed · -10 tokens per session e93fcacdfb78
  3. 5d ago Changed · +40 tokens per session 278fb2ea54fc
  4. 6d ago Changed · +101 tokens per session bd1eb142fc0c
  5. 8d ago Changed · +3 lines · +290 tokens per session 7ca01add1bf9
  6. 9d ago Changed · +46 tokens per session 942685462e11
  7. 10d ago Changed · +1 lines · +158 tokens per session 61eed857b558
  8. 11d ago Changed · -2 tokens per session 23d000dc0c59
  9. 12d ago Changed · +38 tokens per session acb807a55f9f
  10. 13d ago First seen · 281 lines · 16,128 tokens per session scan D 3fda6f038034

Subscribe to this mod's changes

agent-glovebox CLAUDE.md is an instructions file published in the GitHub repository AlexanderMattTurner/agent-glovebox (68 stars, last pushed today), licensed Apache-2.0. It adds 16,835 tokens to every session, about $0.0673 per session on Opus 5.5. A static security scan graded it D with 3 findings (reads agent configuration directories, enumerates other installed skills, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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