What is bjoern AGENTS.md?

A project guide for Bjoern, a Gradle plugin that reads YAML-based specification files and generates Java tests and documentation. It explains the project layout, build commands, and generated-file rules.

Use it when developing or testing the Bjoern plugin. It covers Gradle builds, generated test classes, AsciiDoc documentation, and the sample consumer project.

It prevents contributors from editing generated files or missing the commands needed to regenerate tests and documentation.

How Mehtrick/bjoern configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to Mehtrick/bjoern. 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/Mehtrick/bjoern/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Mehtrick/bjoern

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/mehtrick/bjoern/agents-md/github.svg)](https://agentmods.dev/instructions/mehtrick/bjoern/agents-md)

Your own site

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

Per session 512 This file is loaded in full into every session.

When invoked 512 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	$0.00512	$0.00512
Opus 5.5	$0.00205	$0.00205
Sonnet 5.5	$0.00102	$0.00102
Haiku 4.5	$0.00051	$0.00051

Measured 1mo ago against content hash 9d096b87195d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bjoern 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 1mo 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 · 42 lines

What it actually says

AGENTS.md

Build & Test

./gradlew build          # compile + test (CI matrix: Java 8, 11, 17, 21)
./gradlew test           # tests only (JUnit 5 platform)
./gradlew bjoerngen      # generate abstract test classes from .zgr specs
./gradlew bjoerndoc      # generate AsciiDoc documentation from .zgr specs

No separate lint or typecheck step — build covers compilation + tests.

Project Structure

Single-module Gradle plugin project (settings.gradle root = bjoern-gradle-plugin).

Source packages under src/main/java/de/mehtrick/bjoern/:

parser/ — reads .zgr (YAML) spec files via Jackson
generator/ — produces Java test classes via JavaPoet
doc/ — produces AsciiDoc via Freemarker templates (src/main/resources/*.ftlh)
gradle/ — plugin entry point (BjoernPlugin), tasks, extension
base/ — shared config model and custom exceptions

bjoern-sample/ is a standalone consumer project with its own Gradle wrapper.

Key Conventions

Generated code is ephemeral. Files in src/gen/ are gitignored and regenerated on every bjoerngen run. Never edit them.
Spec files use the .zgr extension (YAML-based BDD: Feature/Background/Scenarios with Given/When/Then).
Use JavaPoet for Java code generation — never string concatenation.
Use Freemarker (.ftlh) for template-based doc generation.
Custom exceptions live in base/: BjoernMissingPropertyException, BjoernGeneratorException, NotSupportedJunitVersionException.
Plugin version comes from RELEASE_VERSION env var (set by CI on release tags); library version in version.config.
Gradle wrapper is 8.4. README notes Gradle >7.6.2 required due to Jackson dependency bug.

Testing

Tests use JUnit 5 (useJUnitPlatform()) with AssertJ assertions.
Test specs (.zgr files) live in src/test/resources/.
Generated test output goes to src/gen/ (gitignored).

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.

1mo ago First seen · 42 lines · 512 tokens per session scan A 9d096b87195d

Subscribe to this mod's changes

bjoern AGENTS.md is an instructions file published in the GitHub repository Mehtrick/bjoern (4 stars, last pushed 1mo ago), licensed MIT. It adds 512 tokens to every session, about $0.0020 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 2026-08-31.

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