agentmods.dev

mcp AGENTS.md

Repository instructions for the GrowthKit MCP worker, a Cloudflare Worker that provides an MCP server. MCP is a standard way for AI clients to discover and call tools; the instructions document the codebase's rules, known facts, and verification practices.

In plain words
What is it for?
Use it when modifying the GrowthKit MCP worker, its AGENTS.md and CLAUDE.md guidance, Cloudflare or Supabase integration, MCP endpoints, OAuth, workflows, or golden-master tests.
Why use it?
It reduces mistakes when changing a public repository whose MCP protocol, deployment setup, and regression checks are implemented manually.

Instructions file for CodexOpenCode

0 3d ago B scan 20,863 tokens original MIT
View the source file growthkit-tools/mcp
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/growthkit-tools/mcp/agents-md
Clone the repo
git clone --depth 1 https://github.com/growthkit-tools/mcp

Made for: Codex, OpenCode.

Per session 20,863 This file is loaded in full into every session.
When invoked 20,863 The same file — it is already loaded in full.
Security scan B 2 findings. Scan, not verified.
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 $0.20863 $0.20863
Opus 5 $0.10431 $0.10431
Sonnet 5 $0.04173 $0.04173
Haiku 4.5 $0.02086 $0.02086

Measured 2d ago against content hash 06855886fc72, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

mcp AGENTS.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 2d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

**Die Regel wurde am 21.08. aus `~/.claude/settings.json` entfernt — nicht

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| zsh-Schleifenvariable `path` | „33 von 33 Abweichungen" | `path` ist an `PATH` gebunden; `curl` war nach der ersten Zeile nicht mehr auffindbar |
AGENTS.md · 1,157 lines

How it starts

The opening of the file, as written. The whole thing — 1,157 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GrowthKit MCP Worker — Agent Quick Reference

Ablage: Repo-Root als AGENTS.md. Danach git rm CLAUDE.md && ln -s AGENTS.md CLAUDE.md — eine Quelle, zwei Namen. Zwei getrennte Guide-Dateien driften auseinander.

Prinzip: Jede Zeile geht auf einen beobachteten Fehler oder eine reale Invariante zurück. Neue Zeilen nur bei echtem Anlass. Zeilen ohne Anlass sind Rauschen.

⚠️ TODO = gegen das Repo verifizieren. 🔵 ENTSCHEIDUNG = Chris muss bestätigen.

Wissen

Cloudflare Worker, serviert den GrowthKit MCP-Server auf mcp.growthkit.tools.

  • Ein hand-rolled File: index.js, ~4200 Zeilen (Stand 24.08.2026). MCP JSON-RPC manuell implementiert, kein SDK. tools/list, tools/call, resources/list, resources/read, Prompts und OAuth sind alle von Hand gebaut. Es gibt keine Bibliothek, die Fehler abfängt.
  • Konsumenten: Claude (Desktop/Web/Code), ChatGPT, MCP-Registries. Regressionen brechen still — kein Alert, nur sinkende Nutzung. Deshalb ist der Golden Master nicht optional.
  • Backend: Supabase-Projekt (EU Frankfurt) über Edge Functions, Custom Domain api.growthkit.tools proxied /functions/v1/*. Project-Ref steht in wrangler.toml / den Worker-Secrets, nicht hier.
  • Auth: Zwei Auflösungswege, unterschieden allein am Token-Präfix (index.js ~1321). Die Entscheidung fällt vor jedem Backend-Aufruf.
    • Bearer beginnt mit gk_ → direkter API-Token-Pfad: resolve_user_token gegen user_api_tokens; die RPC hasht selbst und prüft is_active. Kein OAuth, kein Browser — das ist der Pfad für Tests, CI und Automatisierung. Zwei bewusste Nicht-Handlungen: last_used_at bleibt ungeschrieben (resolve_user_token schreibt nicht, das tut nur use_api_token), Tokens sehen über diesen Weg also unbenutzt aus; und isDemo ist hier immer false — user_api_tokens hat kein is_demo, Demo-Sessions laufen ausschließlich über OAuth.
    • Alles andere → OAuth-Pfad wie bisher: gegen oauth_tokens.access_token mit Ablaufprüfung; das gk_-Token liegt dort als user_token.

Read the full file on GitHub · 1,157 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. 2d ago First seen · 1,157 lines · 20,863 tokens per session scan B 06855886fc72

Subscribe to this mod's changes

mcp AGENTS.md is an instructions file published in the GitHub repository growthkit-tools/mcp (0 stars, last pushed 3d ago), licensed MIT. It adds 20,863 tokens to every session, about $0.1043 per session on Opus 5. A static security scan graded it B with 2 findings (reads agent configuration directories, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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