What is World-Anvil-MCP AGENTS.md?

Repository instructions for the datagen24/World-Anvil-MCP project. They describe its layout, Python environment setup, required checks, configuration, and development commands.

Use them when setting up the project with uv and a virtual environment, verifying the environment, placing code and tests correctly, configuring .env files, and running development checks.

They give AI agents the project-specific steps and constraints needed to inspect, install, test, and modify the repository consistently.

How datagen24/World-Anvil-MCP configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to datagen24/World-Anvil-MCP. 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/datagen24/World-Anvil-MCP/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/datagen24/World-Anvil-MCP

Made for: Codex, OpenCode.

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/datagen24/world-anvil-mcp/agents-md.svg)](https://agentmods.dev/instructions/datagen24/world-anvil-mcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/datagen24/world-anvil-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/datagen24/world-anvil-mcp/agents-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,395 This file is loaded in full into every session.

When invoked 1,395 The same file — it is already loaded in full.

Security scan C 2 findings. 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	$0.01395	$0.01395
Opus 5	$0.00698	$0.00698
Sonnet 5	$0.00279	$0.00279
Haiku 4.5	$0.00139	$0.00139

Measured 7d ago against content hash 8993c6d2774c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade C, and why

World-Anvil-MCP AGENTS.md scanned grade C 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 7d 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

- Install uv (one-time): `curl -LsSf https://astral.sh/uv/install.sh | sh` (or `brew install uv`).

Makes network callslowCapability

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

- Install uv (one-time): `curl -LsSf https://astral.sh/uv/install.sh | sh` (or `brew install uv`).

AGENTS.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Guidelines

Project Structure & Modules

Source code lives in src/world_anvil_mcp/ (entry: server.py).
Package name: world_anvil_mcp; console script: world-anvil-mcp.
Tests in tests/ (place unit tests as tests/test_*.py).
Docs and planning in docs/ and claudedocs/; OpenAPI at openapi.yml.
Configuration via .env (see .env.example).

Environment Setup (uv + venv)

Install uv (one-time): curl -LsSf https://astral.sh/uv/install.sh | sh (or brew install uv).
Create project-local venv: uv venv --python 3.11 .venv.
Activate: macOS/Linux source .venv/bin/activate; Windows PowerShell .venv/Scripts/Activate.ps1.
Install dev deps: uv pip install -e .[dev].
Tip: Use uv run <cmd> to run tools without activating (e.g., uv run ruff check .).

Environment Verification Protocol (MANDATORY)

Before installing any packages, verify environment:

which uv && uv --version  # Confirm uv is available
test -d .venv             # Confirm venv exists
source .venv/bin/activate # Activate venv
uv pip install <package>  # Now safe to install

Never install to system Python. Always verify environment first. Rationale: Prevents "wrong Python" environment issues and system pollution. Evidence: Phase 1.1 environment protocol prevented installation errors.

Build, Test, and Development

Create env and install (dev):
- uv pip install -e .[dev] or pip install -e .[dev]
Run server locally:
- world-anvil-mcp or python -m world_anvil_mcp.server
Lint & type-check:
- ruff format . then ruff check . (line length 100) and mypy src (strict)
Tests & coverage:
- pytest -q and pytest --cov=src --cov-report=term-missing
Build artifact (optional):
- python -m build (requires build package) or hatch build

Coding Style & Naming

Python 3.11; prefer type hints everywhere; pass mypy --strict.
Ruff rules enabled: E,F,I,N,W,UP; imports sorted by ruff/isort; 100-char lines.
Naming: snake_case functions/modules, PascalCase classes, UPPER_SNAKE_CASE constants.
Public APIs live under world_anvil_mcp.api or server tools/resources; keep I/O at edges.
Public APIs should include Google-style docstrings with Args/Returns/Raises and examples.

Read the full file on GitHub · 102 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.

7d ago First seen · 102 lines · 1,395 tokens per session scan C 8993c6d2774c

Subscribe to this mod's changes

World-Anvil-MCP AGENTS.md is an instructions file published in the GitHub repository datagen24/World-Anvil-MCP (1 stars, last pushed 9mo ago), licensed BSD-3-Clause. It adds 1,395 tokens to every session, about $0.0070 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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.

openai/codex · 5,153 tokens

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).

microsoft/vscode · 6,785 tokens

World-Anvil-MCP: Instructions file for Codex