What is wrenn CLAUDE.md?

A project instruction file for Wrenn, an open-source platform that runs AI coding agents in isolated virtual machines. It describes the project, its architecture, and the required Makefile commands for building and developing it.

Use it when working on Wrenn’s control plane, host agent, environment service, frontend, or related development tasks.

It gives the coding agent project-specific guidance instead of relying on generic commands or assumptions. This helps keep changes consistent with Wrenn’s development process.

How wrennhq/wrenn configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to wrennhq/wrenn. 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/wrennhq/wrenn/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/wrennhq/wrenn

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/wrennhq/wrenn/claude-md/github.svg)](https://agentmods.dev/instructions/wrennhq/wrenn/claude-md)

Your own site

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

Per session 5,966 This file is loaded in full into every session.

When invoked 5,966 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.

Model	Per session	Once invoked
Fable 5.1	$0.05966	$0.05966
Opus 5	$0.02983	$0.02983
Sonnet 5	$0.01193	$0.01193
Haiku 4.5	$0.00597	$0.00597

Measured 9d ago against content hash 2a885f272ae3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade B, and why

wrenn CLAUDE.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 9d 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.

make dev-agent # Host agent (sudo required)

CLAUDE.md · 273 lines

How it starts

The opening of the file, as written. The whole thing — 273 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

Wrenn is the runtime where AI engineers live — an open-source platform for running AI coding agents. Each project gets a persistent, isolated workspace (Cloud Hypervisor microVM) where agents edit code, run tests, debug, and ship continuously, with humans supervising via SDKs and chat surfaces. Fast boot, persistent state, available hosted or fully self-hosted with a single agent binary on each host you own. (The underlying primitive is still an isolated microVM — "sandbox" in the API/backend, "capsule" in the dashboard.)

Build & Development Commands

All commands go through the Makefile. Never use raw go build or go run.

make build              # Build all binaries → builds/
make build-cp           # Control plane only
make build-agent        # Host agent only
make build-envd         # envd static binary (Rust, musl, verified statically linked)
make build-frontend     # SvelteKit dashboard → frontend/build/ (served by Caddy)

make dev                # Full local dev: infra + migrate + control plane
make dev-infra          # Start PostgreSQL + Prometheus + Grafana (Docker)
make dev-down           # Stop dev infra
make dev-cp             # Control plane with hot reload (if air installed)
make dev-frontend       # Vite dev server with HMR (port 5173)
make dev-agent          # Host agent (sudo required)
make dev-envd           # envd in debug mode (port 49983)

make check              # fmt + vet + lint + test (CI order)
make test               # Unit tests: go test -race -v ./internal/...
make test-integration   # Integration tests (require host agent + Cloud Hypervisor)
make fmt                # gofmt and rust fmt
make vet                # go vet
make lint               # golangci-lint

make migrate-up         # Apply pending migrations
make migrate-down       # Rollback last migration
make migrate-create name=xxx  # Scaffold new goose migration (never create manually)
make migrate-reset      # Drop + re-apply all

make generate           # Proto (buf) + sqlc codegen
make proto              # buf generate for proto dirs
make tidy               # go mod tidy

Read the full file on GitHub · 273 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.

9d ago First seen · 273 lines · 5,966 tokens per session scan B 2a885f272ae3

Subscribe to this mod's changes

wrenn CLAUDE.md is an instructions file published in the GitHub repository wrennhq/wrenn (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 5,966 tokens to every session, about $0.0298 per session on Opus 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.

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vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

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wrenn: Instructions file for Claude Code