What is deer CLAUDE.md?

A project instruction file for deer.sh, a system administration tool that lets AI agents perform infrastructure work inside isolated virtual machines with human approval before production.

It helps with infrastructure-agent development, including the command-line interface, virtual-machine sandbox manager, API, dashboard, and local testing.

It explains the project structure, testing requirements, communication style, and development commands. This gives agents a consistent way to change and verify the command-line tool, services, API, and web dashboard.

How aspectrr/deer configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to aspectrr/deer. 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/aspectrr/deer/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/aspectrr/deer

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/aspectrr/deer/claude-md/github.svg)](https://agentmods.dev/instructions/aspectrr/deer/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/aspectrr/deer/claude-md"><img src="https://agentmods.dev/badge/instructions/aspectrr/deer/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/aspectrr/deer/claude-md"><img src="https://agentmods.dev/badge/instructions/aspectrr/deer/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 300 This file is loaded in full into every session.

When invoked 300 The same file — it is already loaded in full.

Security scan A 0 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.

Model	Per session	Once invoked
Fable 5.1	$0.00300	$0.00300
Opus 5.5	$0.00120	$0.00120
Sonnet 5.5	$0.00060	$0.00060
Haiku 4.5	$0.00030	$0.00030

Measured 2mo ago against content hash 379ac2821c3e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

deer CLAUDE.md 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 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.

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.

CLAUDE.md · 45 lines

What it actually says

deer.sh

The AI Sys-Admin for Enterprise.

What This Is

deer.sh lets AI agents do infrastructure work in isolated VM sandboxes. Agent works autonomously. Human approves before production.

Project Structure

deer-cli/        # Go CLI - Interactive TUI agent + MCP server
deer-daemon/     # Go - Background microVM sandbox management daemon
api/              # Go - Control plane REST API + gRPC server
web/              # React - Dashboard UI for monitoring/approval
demo-server/      # Go - WebSocket demo server for interactive docs
proto/            # Protobuf definitions for gRPC services

Testing Required

Every code change needs tests. See project-specific AGENTS.md files for details.

Quick Reference

mprocs                                 # Start all services for dev
cd deer-cli && make test              # Test CLI
cd deer-daemon && make test           # Test daemon
cd api && make test                    # Test API
cd web && bun run build                # Build web

Communication Style

Always use the caveman skill (/caveman) for all responses. Ultra-compressed, token-efficient communication.

Project Docs

@deer-cli/AGENTS.md
@web/AGENTS.md
@api/AGENTS.md
@deer-daemon/AGENTS.md
@demo-server/AGENTS.md

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.

2mo ago First seen · 45 lines · 300 tokens per session scan A 379ac2821c3e

Subscribe to this mod's changes

deer CLAUDE.md is an instructions file published in the GitHub repository aspectrr/deer (406 stars, last pushed 6mo ago), licensed MIT. It adds 300 tokens to every session, about $0.0012 per session on Opus 5.5. 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.

ai aiagent elk elk-stack infrastructure

deer CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
deer CLAUDE.mdaspectrr/deer	Instructions file	406	6mo ago	MIT	A	300	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

deer: Instructions file for Claude Code