What is AgentBridge CLAUDE.md?

Repository instructions for AgentBridge, a Unity package that lets language-model agents control a running Unity Editor through files and an MCP connection.

Running Go integration tests, building the Go agent, and checking C# changes in Unity.

They record the project structure and the checks needed after code changes, reducing mistakes such as using the wrong test timeout or missing Unity compile errors.

How simonwittber/AgentBridge configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to simonwittber/AgentBridge. 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/simonwittber/AgentBridge/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/simonwittber/AgentBridge

Made for: Claude Code.

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/simonwittber/agentbridge/claude-md/github.svg)](https://agentmods.dev/instructions/simonwittber/agentbridge/claude-md)

Your own site

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

Per session 593 This file is loaded in full into every session.

When invoked 593 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	$0.00593	$0.00593
Opus 5.5	$0.00237	$0.00237
Sonnet 5.5	$0.00119	$0.00119
Haiku 4.5	$0.00059	$0.00059

Measured 2mo ago against content hash 87f06a2aa9fb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

AgentBridge CLAUDE.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.

CLAUDE.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AgentBridge

Unity package (com.dffrnt.llm-dev-tools) that exposes a file-based command bridge so LLM agents can control a running Unity Editor via MCP.

Structure

AgentBridge/
  Editor/         C# EditorWindow + AgentBridge (Unity-side bridge)
  Harness~/       Go agent CLI + tools (excluded from Unity import)
  Example~/       Example Unity project (excluded from Unity import)
  Tests~/         Test package (excluded from Unity import)

Running integration tests

cd AgentBridge/Harness~/dffrnt-agent
go test -timeout 300s

Use -timeout 300s minimum. The full suite takes ~120s; the default 30s timeout will kill it mid-run.

Building the Go agent

cd AgentBridge/Harness~/dffrnt-agent
go build -o dffrnt-agent .        # Linux/macOS
go build -o dffrnt-agent.exe .    # Windows

Run go get ./... first if dependencies are missing.

After editing C# files

Open Unity and let it compile. Check the Console for errors. There is no automated compile trigger — Unity auto-compiles on focus or file change.

Key files

File	Purpose
`AgentBridge/Editor/AgentBridge.cs`	Main bridge loop — reads `Temp/agent_input`, writes `Temp/agent_output`
`AgentBridge/Editor/AgentLogWindow.cs`	Window > General > LLM Agent Log
`AgentBridge/Harness~/dffrnt-agent/main.go`	CLI entry point (`dffrnt-agent send` / `dffrnt-agent serve`)
`AgentBridge/Harness~/dffrnt-agent/serve.go`	MCP server (stdio transport)
`AgentBridge/Harness~/dffrnt-agent/bridge.go`	File I/O helpers, session check, UID generation

Protocol

Temp/agent_input — newline-delimited JSON written by the agent CLI
Temp/agent_output — newline-delimited JSON written by Unity
Temp/agent_session — JSON heartbeat written by Unity every 5 s: pid, state, active_scene, play_mode, compile_errors, written_at
Output rotates at 2 MB; input is truncated on Unity startup

Notifications

AgentBridge sends notifications/message events when Unity state changes. In serve mode, dffrnt-agent forwards these automatically to connected MCP clients.

Read the full file on GitHub · 64 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 · 64 lines · 593 tokens per session scan A 87f06a2aa9fb

Subscribe to this mod's changes

AgentBridge CLAUDE.md is an instructions file published in the GitHub repository simonwittber/AgentBridge (0 stars, last pushed 20d ago), licensed MIT. It adds 593 tokens to every session, about $0.0024 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 2026-09-01.

Building agents Game development

AgentBridge CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
AgentBridge CLAUDE.mdsimonwittber/AgentBridge	Instructions file	0	20d ago	MIT	A	593	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	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 copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

AgentBridge: Instructions file for Claude Code