Borrowing it
Nothing to install: this file belongs to mckinsey/agents-at-scale-ark. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mckinsey/agents-at-scale-ark/main/CLAUDE.mdgit clone --depth 1 https://github.com/mckinsey/agents-at-scale-arkWrote 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.
[](https://agentmods.dev/instructions/mckinsey/agents-at-scale-ark/claude-md)<a href="https://agentmods.dev/instructions/mckinsey/agents-at-scale-ark/claude-md"><img src="https://agentmods.dev/badge/instructions/mckinsey/agents-at-scale-ark/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.
<a href="https://agentmods.dev/instructions/mckinsey/agents-at-scale-ark/claude-md"><img src="https://agentmods.dev/badge/instructions/mckinsey/agents-at-scale-ark/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.02628 | $0.02628 |
| Opus 5 | $0.01314 | $0.01314 |
| Sonnet 5 | $0.00526 | $0.00526 |
| Haiku 4.5 | $0.00263 | $0.00263 |
Grade A, and why
agents-at-scale-ark 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 271 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
NEVER add comments to generated code unless explicitly requested by the user
Pre-Push Gates (Non-Negotiable)
BEFORE pushing ANY commit, make lint and make test MUST pass locally
in every directory the change touches. Exact commands per stack live in
"Build Instructions" below; do not skip them.
- Never push with lint failures. Same rules CI enforces
(
golangci-lint+gofumptfor Go,ruff/pyrightfor Python,eslintfor TypeScript). Local pass is the minimum bar. - Never push with failing tests.
- Never bypass hooks (
--no-verify,--no-gpg-sign) unless the user explicitly asks. - "One-line changes" hide
gofumptand whitespace diffs the most. Run the gates regardless of change size. - Tooling gotcha (Go):
GOLANGCI_LINT_VERSIONinark/Makefilemay lag local Go. Ifmake linterrors with "Go language version ... used to build golangci-lint is lower than the targeted Go version", fall back togofumpt -l .(install viago install mvdan.cc/gofumpt@latest) — this catches the formatting rule that breaks CI most often. Fullgolangci-lintstill runs in CI.
Project Structure
Core Folders
-
ark/- Kubernetes operator (Go)- Controller reconciles CRDs: Agent, Model, Query, Team, MCPServer, ExecutionEngine, A2AServer
- Webhooks for validation and mutation (including migration warnings)
executors/completions/- Default executor (separate deployment, communicates with controller via A2A)- The controller dispatches queries to the appropriate executor via A2A protocol
-
lib/ark-sdk/- Python SDK (generated + overlay)- Generated from CRDs via OpenAPI, with hand-written overlay for executor interfaces
BaseExecutorABC andExecutorApp(A2A bridge) provide the standard interface for pluggable executors- Downstream executor implementations live in the marketplace
-
services/- Component servicesark-api/- REST API gateway (Python/FastAPI) with streaming, A2A, broker integrationark-broker/- In-memory event bus (Node.js/Express) for messages, chunks, traces, events, sessionsark-dashboard/- Web UI (Next.js/React)ark-mcp/- MCP server host servicelocalhost-gateway/- Local development gateway
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.
- 6d ago First seen · 271 lines · 2,628 tokens per session scan A 31baad86c1d1
agents-at-scale-ark CLAUDE.md is an instructions file published in the GitHub repository mckinsey/agents-at-scale-ark (422 stars, last pushed today), licensed Apache-2.0. It adds 2,628 tokens to every session, about $0.0131 per session on Opus 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 2026-09-03.
Other instructions, from other repositories
agent-compass pr-workflow.instructions.md
Instructions for me-cedric/agent-compass: For PR creation, default base branch is develop. Assign the PR to yourself with --assignee @me. If reviewers are not specified, ask for at least one and list likely repo contributors. Use only labels that exist in gh label list.
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.