What is recaf-mcp AGENTS.md?

A set of project instructions for an MCP server plugin that lets AI agents perform Java reverse engineering inside Recaf, a tool for examining and modifying compiled Java programs.

Use it when developing the Recaf plugin or its bridge, running tests, building the plugin JAR, launching Recaf locally, or preparing a release.

It documents the plugin's Java and Python parts, how they communicate, and how to build, test, run, and release them.

How tha23rd/recaf-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to tha23rd/recaf-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/tha23rd/recaf-mcp/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/tha23rd/recaf-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/tha23rd/recaf-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/tha23rd/recaf-mcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/tha23rd/recaf-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tha23rd/recaf-mcp/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/tha23rd/recaf-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tha23rd/recaf-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,133 This file is loaded in full into every session.

When invoked 1,133 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	$0.01133	$0.01133
Opus 5.5	$0.00453	$0.00453
Sonnet 5.5	$0.00227	$0.00227
Haiku 4.5	$0.00113	$0.00113

Measured 2mo ago against content hash 1f79dbbdc154, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

recaf-mcp 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 · 130 lines

How it starts

The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project Overview

MCP (Model Context Protocol) server plugin for Recaf, enabling AI agents to perform Java reverse engineering tasks. 68 tools across 13 categories.

Repo: https://github.com/tha23rd/recaf-mcp (private)
Recaf: https://github.com/Col-E/Recaf
Recaf docs: https://recaf.coley.software/dev/index.html

Architecture

recaf-mcp-plugin/ — Java Recaf plugin with embedded Jetty HTTP server + MCP SDK
recaf-mcp-bridge/ — Python stdio-to-HTTP bridge for tools needing stdin/stdout
Plugin runs inside Recaf's JVM, exposes Streamable HTTP endpoint at localhost:8085/mcp
Shadow JAR shades Jetty, MCP SDK, and TOON into the plugin JAR

Build & Test

cd recaf-mcp-plugin
./gradlew test          # Run unit tests
./gradlew shadowJar     # Build plugin JAR
./gradlew runRecaf      # Build, deploy to ~/.config/Recaf/plugins/, launch Recaf

Plugin JAR output: recaf-mcp-plugin/build/libs/recaf-mcp-plugin-<version>.jar

Release Flow

Bump version in recaf-mcp-plugin/build.gradle (version = 'x.y.z')
Commit and push
Tag: git tag vx.y.z && git push origin vx.y.z
GitHub Actions builds the JAR and creates a release with the artifact attached

CI runs on every push to master/main and on PRs.

Key Conventions

Tool providers extend AbstractToolProvider in recaf-mcp-plugin/src/main/java/dev/recafmcp/providers/
Resource providers in recaf-mcp-plugin/src/main/java/dev/recafmcp/resources/
Recaf dependencies are compileOnly (provided at runtime by Recaf)
Response format: TOON by default (-Drecaf.mcp.format=json for JSON)
Port/host configurable via RECAF_MCP_PORT/RECAF_MCP_HOST env vars

Issue Tracking with bd (beads)

IMPORTANT: This project uses bd (beads) for ALL issue tracking. Do NOT use markdown TODOs, task lists, or other tracking methods.

Why bd?

Dependency-aware: Track blockers and relationships between issues
Git-friendly: Auto-syncs to JSONL for version control
Agent-optimized: JSON output, ready work detection, discovered-from links
Prevents duplicate tracking systems and confusion

Read the full file on GitHub · 130 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 · 130 lines · 1,133 tokens per session scan A 1f79dbbdc154

Subscribe to this mod's changes

recaf-mcp AGENTS.md is an instructions file published in the GitHub repository tha23rd/recaf-mcp (12 stars, last pushed 5mo ago), licensed MIT. It adds 1,133 tokens to every session, about $0.0045 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.

Debugging Java Languages

recaf-mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
recaf-mcp AGENTS.mdtha23rd/recaf-mcp	Instructions file	12	5mo ago	MIT	A	1,133	Codex, OpenCode
vibetags com-example-service-TransactionalPaymentService.instructions.mdPIsberg/vibetags	Instructions file	25	yesterday	MIT	A	104	GitHub Copilot
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	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

recaf-mcp: Instructions file for Codex