What is activeagent AGENTS.md?

A reference guide that explains the structure and conventions of the ActiveAgent Ruby codebase. It maps the main files, agent classes, providers, templates, dashboard, tests, and documentation.

Use it when generating or reviewing code for ActiveAgent, locating its entry points and tests, understanding how agents and prompts map to Rails concepts, or finding provider and dashboard code.

It gives coding agents the project context needed to make changes in the right places. This reduces guesswork when navigating a codebase that connects Rails applications with AI features.

How activeagents/activeagent configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to activeagents/activeagent. 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/activeagents/activeagent/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/activeagents/activeagent

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/activeagents/activeagent/agents-md/github.svg)](https://agentmods.dev/instructions/activeagents/activeagent/agents-md)

Your own site

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

Per session 5,810 This file is loaded in full into every session.

When invoked 5,810 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	$0.05810	$0.05810
Opus 5.5	$0.02324	$0.02324
Sonnet 5.5	$0.01162	$0.01162
Haiku 4.5	$0.00581	$0.00581

Measured 5d ago against content hash c04b1b7b1827, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

activeagent 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 5d 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 · 550 lines

How it starts

The opening of the file, as written. The whole thing — 550 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ActiveAgent - AI Code Generation Context

This file helps AI code generation tools (GitHub Copilot, Claude Code, Cursor, Codex, etc.) understand and work with the ActiveAgent codebase effectively.

Public content boundary

This is a public framework repository. Keep code, examples, tests, documentation, issues, and PRs generic. Use independently written reproductions and synthetic fixtures for behavior discovered while integrating a private application.

Do not include customer names, organization mappings, private repository URLs, client source or business rules, agent instructions, evaluation prompts or reports, records, credentials, screenshots, or logs from private projects. Renaming identifiers in a copied customer artifact does not make it generic. Keep each private customer's material within its own organization context.

Quick Reference

What	Where
Main entry point	`lib/active_agent.rb`
Base agent class	`lib/active_agent/base.rb`
Provider implementations	`lib/active_agent/providers/`
Agent concerns/mixins	`lib/active_agent/concerns/`
Agent-as-tool delegation	`lib/active_agent/delegation/`
Rails generators	`lib/generators/active_agent/`
Scenario evaluations (parser, runner, scorer, report, publisher)	`lib/active_agent/evals/`
Command line (`activeagent` executable)	`exe/activeagent`, `lib/active_agent/cli/`
Dashboard engine (`actionagent` gem)	`actionagent/`
Dashboard React source	`actionagent/frontend/`
Test suite	`test/`
Test Rails app	`test/dummy/`
Documentation source	`docs/`

Architecture Overview

ActiveAgent extends Rails MVC patterns to AI interactions:

Rails Pattern          →    ActiveAgent Pattern
Controllers            →    Agents (AI logic handlers)
Actions                →    Agent methods (return Generation objects)
Views                  →    Templates (ERB prompts in app/views/agents/)

Core Classes

ActiveAgent::Base - Base class all agents inherit from
ActiveAgent::Generation - Lazy execution wrapper (like ActionMailer::MessageDelivery)
ActiveAgent::Providers::BaseProvider - Abstract base for LLM providers

Read the full file on GitHub · 550 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.

5d ago Changed · +6 lines · +135 tokens per session c04b1b7b1827
6d ago Changed · +8 lines · +140 tokens per session d58a7d4b2ae1
9d ago Changed · +76 lines · +1,238 tokens per session 9f9d686a51d3
11d ago Changed · +1 tokens per session c06123e13572
1mo ago Changed · +12 lines · +99 tokens per session b55a94883504
2mo ago First seen · 448 lines · 4,197 tokens per session scan A 22d0286fc642

Subscribe to this mod's changes

activeagent AGENTS.md is an instructions file published in the GitHub repository activeagents/activeagent (986 stars, last pushed yesterday), licensed MIT. It adds 5,810 tokens to every session, about $0.0232 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.

activeagent AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
activeagent AGENTS.mdactiveagents/activeagent	Instructions file	986	yesterday	MIT	A	5,810	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	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
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

activeagent: Instructions file for Codex