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mcp-polvenn: Instructions file for Codex

AGENTS.md

mcp-polvenn AGENTS.md is an instructions file for Codex, OpenCode from henrikogaard/mcp-polvenn. It costs 1,326 tokens per session, scanned B, original, MIT.

Project instructions for polvenn-mcp-server, a local service that tracks Vinmonopolet products, stores, stock, release feeds, and watchlists. A watchlist is a saved set of items that can be checked for changes.

In plain words
What is it for?
Use them when developing or modifying product searches, store discovery, stock checks, release-feed lookups, watchlist checks, configuration validation, or the server's MCP tools.
Why use it?
They explain the service's purpose, current boundaries, architecture, and important design decisions so code changes fit the existing project.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: reads ~/.codex or $CODEX_HOME, but also the file is AGENTS.md. Also seen: mentions AGENTS.md; mentions Codex.

This is henrikogaard/mcp-polvenn's own configuration. It tells Codex and OpenCode how to work on mcp-polvenn itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mcp-polvenn configures →

Not installable: its command points at a path on the author’s own machine, so it runs nowhere else. The line is /Users/henrik/Repos/mcp-polvenn.

not rated 0repo 4mo ago B scan 1,326 tokens original MIT
View source ↗ henrikogaard/mcp-polvenn
Reuse

Borrowing it

Nothing to install: this file belongs to henrikogaard/mcp-polvenn. 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/henrikogaard/mcp-polvenn/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/henrikogaard/mcp-polvenn

Made for: Codex, OpenCode.

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Per session 1,326 This file is loaded in full into every session.
When invoked 1,326 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01326 $0.01326
Opus 5 $0.00663 $0.00663
Sonnet 5 $0.00265 $0.00265
Haiku 4.5 $0.00133 $0.00133

Measured 9d ago against content hash fa81a87b3ca1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade B, and why

mcp-polvenn AGENTS.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.

Reads agent configuration directoriesmediumAgent snooping

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

Add to `~/.codex/config.toml`:
AGENTS.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Polvenn MCP Server

What is this?

A local-first MCP (Model Context Protocol) server for tracking beer releases on Vinmonopolet and an external release-feed API backed by your own collector/database.

Package: @henrikogard/polvenn-mcp-server
CLI: polvenn-mcp-server
Author: Henrik
Location: /Users/henrik/Repos/mcp-polvenn

Current scope

This project currently focuses on:

  • Vinmonopolet product search
  • Vinmonopolet store discovery
  • Vinmonopolet stock checks
  • external release-feed lookups
  • local watchlist rules and incremental watchlist checks
  • local configuration validation

Architecture

polvenn-mcp-server/
├── src/
│   ├── index.ts              # Entry point — McpServer + stdio transport
│   ├── constants.ts          # API base URLs, defaults, retry settings
│   ├── types.ts              # Domain interfaces
│   ├── sql.js.d.ts           # Type declarations for sql.js
│   ├── tools/
│   │   └── index.ts          # MCP tool registrations + handlers
│   ├── schemas/
│   │   └── tools.ts          # Zod input schemas
│   ├── services/
│   │   ├── release-feed.ts   # External release feed client
│   │   ├── vinmonopolet.ts   # Vinmonopolet API client
│   │   └── watchlist.ts      # Watchlist matching logic
│   ├── utils/
│   │   ├── geo.ts            # Distance calculations
│   │   └── http.ts           # Fetch retry/backoff
│   └── db/
│       └── database.ts       # SQLite via sql.js — watchlist, cache, config
├── package.json
├── tsconfig.json
├── .gitignore
├── README.md
└── AGENTS.md

Key decisions

  • Transport: stdio only
  • Database: SQLite via sql.js
  • Storage path: ~/.polvenn/polvenn.db
  • Override path: POLVENN_DATA_DIR
  • No telemetry
  • Tool prefix: polvenn_
  • SDK: @modelcontextprotocol/sdk with server.registerTool()

Data sources

1. Vinmonopolet API

  • Base: https://api.vinmonopolet.no
  • Auth: Ocp-Apim-Subscription-Key
  • Used endpoints:
    • GET /products/v0/details-normal
    • GET /stores/v0/details
    • GET /products/v0/accumulated-stock
  • Notes:
    • stock access may require more than the free Open subscription
    • product and store access should work with Open

Read the full file on GitHub · 193 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. 9d ago First seen · 193 lines · 1,326 tokens per session scan B fa81a87b3ca1

Subscribe to this mod's changes

mcp-polvenn AGENTS.md is an instructions file published in the GitHub repository henrikogaard/mcp-polvenn (0 stars, last pushed 4mo ago), licensed MIT. It adds 1,326 tokens to every session, about $0.0066 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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