openagent CLAUDE.md

openagent CLAUDE.md is an instructions file for coding agents from the-open-agent/openagent. It costs 1,049 tokens per session, scanned A, original, Apache-2.0.

A repository guide for an open-source application with a Go backend and React frontend. It explains the project structure, development commands, tests, builds, and how the two parts work together.

In plain words
What is it for?
Use it when changing, testing, debugging, or building this Go and React application. It also helps explain how the backend serves the frontend and how production builds are created.
Why use it?
It gives a coding agent the project-specific instructions needed to work consistently in the repository. This reduces guesswork about commands, file locations, and how the application is built.

Instructions file

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/the-open-agent/openagent/claude-md
Clone the repo
git clone --depth 1 https://github.com/the-open-agent/openagent

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.

agentmods badge for openagent CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/the-open-agent/openagent/claude-md.svg)](https://agentmods.dev/instructions/the-open-agent/openagent/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/the-open-agent/openagent/claude-md"><img src="https://agentmods.dev/badge/instructions/the-open-agent/openagent/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,049 This file is loaded in full into every session.
When invoked 1,049 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.01049 $0.01049
Opus 5 $0.00524 $0.00524
Sonnet 5 $0.00210 $0.00210
Haiku 4.5 $0.00105 $0.00105

Measured 4d ago against content hash 7f03b4a36e27, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

openagent 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 4d 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 · 66 lines

How it starts

The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Commands

Backend (Go)

go build                    # build backend binary
go run main.go              # run backend (port 14000)
go test ./...               # run all tests
go test ./object/... -run TestFoo  # run a single test

Frontend (React)

cd web && yarn install
yarn start                  # dev server on port 13001
yarn build                  # production build (output goes to web/build, then copied to static/)
yarn lint:js                # lint JS

Full production build uses build.sh which cross-compiles for linux/amd64, linux/arm64, linux/riscv64.

Backend serves the frontend as embedded static files (embed.go); during development the frontend proxy is configured to hit localhost:14000.

Architecture

Backend (Go / Beego)

Module: github.com/the-open-agent/openagent

The backend is a standard Beego MVC app. Every entity follows the same three-layer pattern:

  1. object/<entity>.go — struct definition (xorm tags for DB), and all DB access functions: GetGlobal<Entities>, Get<Entity>Count, GetPagination<Entities>, Get<Entity>, Add<Entity>, Update<Entity>, Delete<Entity>. The primary key is always (Owner string, Name string). Use util.GetId(owner, name) / util.GetOwnerAndNameFromIdWithError(id) for composite key serialization.

  2. controllers/<entity>.go — Beego controller methods wired to routes. Standard set: GetGlobal<Entities>, Get<Entities>, Get<Entity>, Add<Entity>, Update<Entity>, Delete<Entity>. Use c.IsAdmin() / c.IsGlobalAdmin() / c.RequireSignedIn() for auth. Paginated list APIs accept p, pageSize, field, value, sortField, sortOrder query params and use pagination.SetPaginator.

  3. routers/router.gobeego.Router calls grouped by entity (all routes for the same entity's CRUD kept together). No alphabetical ordering within a group. New entity routes should be inserted next to their entity's existing routes (not appended to the end of the file).

Read the full file on GitHub · 66 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.

  1. 4d ago First seen · 66 lines · 1,049 tokens per session scan A 7f03b4a36e27

Subscribe to this mod's changes

openagent CLAUDE.md is an instructions file published in the GitHub repository the-open-agent/openagent (5,599 stars, last pushed today), licensed Apache-2.0. It adds 1,049 tokens to every session, about $0.0052 per session on Opus 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.