What is BannerlordSage AGENTS.md?

A set of instructions for working on BannerlordSage, a Windows tool that examines local files from Mount & Blade II: Bannerlord and makes them searchable for coding agents.

Use it when installing, configuring, checking, or running BannerlordSage, or when working with its game data, database indexes, and mod source code.

It explains the repository's requirements and limits, such as needing a real local game installation and keeping extracted game data and local secrets out of version control.

How hby7921/BannerlordSage configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to hby7921/BannerlordSage. 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/hby7921/BannerlordSage/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/hby7921/BannerlordSage

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/hby7921/bannerlordsage/agents-md/github.svg)](https://agentmods.dev/instructions/hby7921/bannerlordsage/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/hby7921/bannerlordsage/agents-md"><img src="https://agentmods.dev/badge/instructions/hby7921/bannerlordsage/agents-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/hby7921/bannerlordsage/agents-md"><img src="https://agentmods.dev/badge/instructions/hby7921/bannerlordsage/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,309 This file is loaded in full into every session.

When invoked 1,309 The same file — it is already loaded in full.

Security scan A 0 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	$0.01309	$0.01309
Opus 5.5	$0.00524	$0.00524
Sonnet 5.5	$0.00262	$0.00262
Haiku 4.5	$0.00131	$0.00131

Measured 2mo ago against content hash bb94830c4a0e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

BannerlordSage AGENTS.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 2mo 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.

AGENTS.md · 170 lines

How it starts

The opening of the file, as written. The whole thing — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.

BannerlordSage Agent Guide

This repository is a Windows-first MCP server for Mount & Blade II: Bannerlord.

Use this file when an AI coding agent is asked to inspect, install, configure, verify, or run this repo.

Primary Goal

Help the user get BannerlordSage installed and running against a local Bannerlord installation.

What This Repo Does

imports Bannerlord XML from a local game install
decompiles official Bannerlord DLLs
builds SQLite indexes
exposes MCP tools for Bannerlord querying, modding, and reverse engineering
can also index and read the user's own local mod source workspace

Important Constraints

This repo does not include Bannerlord assets
The user must have a legitimate local Bannerlord installation
Commands that use --game-dir require the user's real local path
Never invent a game path; ask for it or discover it from local context
Do not commit dist/, extracted game assets, SQLite databases, or local secrets

First Files To Read

When you first open this repo, read these files before making assumptions:

README.md
package.json
src/server.ts
src/entrypoints/bannerlord-stdio.ts
src/entrypoints/bannerlord-full-stdio.ts
src/entrypoints/bannerlord-setup.ts

Standard Human Install Flow

If the user wants a normal install, use this order:

Install prerequisites:
- Bun
- ripgrep
- .NET SDK 8+
- ILSpyCmd
Install repo dependencies:
- bun install
Run Bannerlord setup:
- bun run setup:bannerlord -- --game-dir "<BANNERLORD_GAME_DIR>"
- setup indexes local decompiled source/XML plus public official/community docs and official API search data by default; use --skip-docs only for offline setup
Start the MCP server:
- bun run start:bannerlord

If the user needs the authoring helpers too:

bun run start:bannerlord:full

MCP Client Config

Recommended MCP entry:

[mcp_servers.bannerlordsage]
command = "bun"
args = ["run", "src/entrypoints/bannerlord-stdio.ts"]
cwd = "<REPO_DIR>"
enabled = true

Read the full file on GitHub · 170 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.

2mo ago First seen · 170 lines · 1,309 tokens per session scan A bb94830c4a0e

Subscribe to this mod's changes

BannerlordSage AGENTS.md is an instructions file published in the GitHub repository hby7921/BannerlordSage (22 stars, last pushed 28d ago), licensed MIT. It adds 1,309 tokens to every session, about $0.0052 per session on Opus 5.5. 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 2026-08-30.

ai-agent harmony-patch mcp-server modding-tools mount-and-blade-2

BannerlordSage AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
BannerlordSage AGENTS.mdhby7921/BannerlordSage	Instructions file	22	28d ago	MIT	A	1,309	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

BannerlordSage: Instructions file for Codex