Borrowing it
Nothing to install: this file belongs to cesteral/mcp-open-advertising. 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/cesteral/mcp-open-advertising/main/CLAUDE.mdgit clone --depth 1 https://github.com/cesteral/mcp-open-advertisingWrote 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/cesteral/mcp-open-advertising/claude-md)<a href="https://agentmods.dev/instructions/cesteral/mcp-open-advertising/claude-md"><img src="https://agentmods.dev/badge/instructions/cesteral/mcp-open-advertising/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/cesteral/mcp-open-advertising/claude-md"><img src="https://agentmods.dev/badge/instructions/cesteral/mcp-open-advertising/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 | $0.03901 | $0.03901 |
| Opus 5.5 | $0.01560 | $0.01560 |
| Sonnet 5.5 | $0.00780 | $0.00780 |
| Haiku 4.5 | $0.00390 | $0.00390 |
Grade B, and why
mcp-open-advertising CLAUDE.md scanned grade B with 2 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 27d 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.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
curl -X POST http://localhost:<port>/mcp -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"ping","id":1}' Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X POST http://localhost:<port>/mcp -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"ping","id":1}' How it starts
The opening of the file, as written. The whole thing — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Guidance for Claude Code (claude.ai/code) when working in this repository. The public fleet overview — server list, ports, API versions, tool counts — lives in README.md. This file covers how the repo is structured and how to work in it: architecture patterns, conventions, gotchas, and cross-cutting subsystems.
Project Overview
Cesteral is an AI-native programmatic advertising optimization platform built on independent MCP (Model Context Protocol) servers — one per ad platform — plus a shared workspace package. Each server is purpose-built around the platform's API client and auth model.
Essential Commands
pnpm install # Install dependencies
pnpm run build # Build all packages (Turborepo, dependency-ordered)
pnpm run typecheck # Type check all packages
pnpm run test # Run all tests
pnpm run clean # Clean build artifacts
./scripts/dev-server.sh <server-name> # Run a server locally on its correct port (e.g. dv360-mcp)
cd packages/<server-name> && pnpm run dev:http # Or run directly
# Single package: cd packages/<server-name> && pnpm run <build|test|typecheck>
Critical: When modifying @cesteral/shared, rebuild all packages with pnpm run build — Turborepo handles dependency order and the workspace:* protocol propagates the changes.
Monorepo Architecture
pnpm workspace monorepo managed by Turborepo. Workspace: @cesteral/shared (types, utilities, auth) + @cesteral/contract-schema (canonical shape of the cesteral.* annotations, dry-run/snapshot response schemas, and the manifest — the source of truth @cesteral/shared re-exports) + @cesteral/contract-hash (canonical tool-definition hash) + one package per MCP server.
- Build pipeline:
build→^build(deps first),typecheck/testdepend on^build - ES modules, Target: ES2022, moduleResolution: bundler
- Each MCP server exposes tools via MCP for external AI agents (Claude Desktop, etc.)
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.
- 27d ago Changed · -164 lines · -9,995 tokens per session ffe1dd5dafb2
- 1mo ago Changed · +96 tokens per session b3645bcfbdc8
- 1mo ago Changed · +12 lines · +3,601 tokens per session 8f82c3184d41
- 1mo ago Changed · +21 lines · +1,409 tokens per session 7d9def1d8edb
- 1mo ago Changed · +105 tokens per session 3baa57ba65d7
- 1mo ago Changed · +110 lines · +3,954 tokens per session aa1c26a6e8c7
- 2mo ago First seen · 204 lines · 4,731 tokens per session scan B 3e5279805993
mcp-open-advertising CLAUDE.md is an instructions file published in the GitHub repository cesteral/mcp-open-advertising (8 stars, last pushed 19d ago), licensed Apache-2.0. It adds 3,901 tokens to every session, about $0.0156 per session on Opus 5.5. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
mcp-open-advertising CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-open-advertising CLAUDE.mdcesteral/mcp-open-advertising | Instructions file | 8 | 19d ago | Apache-2.0 | B | 3,901 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,649 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode ai-customization.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 1,907 | GitHub Copilot |