Agent Operating Protocol

Agent Operating Protocol

A Fable 5-style `AGENTS.md` and `CLAUDE.md` template for high-agency coding assistants.

This project is not Claude Fable 5, is not affiliated with Anthropic, and does not reproduce vendor system prompts. It is designed to help coding agents behave more like what developers valued in Fable 5-style agents: proactive investigation, long-horizon planning, tool discipline, verification, fallback behavior, and durable handoff.

Why This Exists

Strong coding agents are not only strong because of model weights. The "Fable 5 feeling" many developers noticed is also an operating protocol: the agent classifies the task, gathers real context, uses tools deliberately, verifies its work, and leaves a recovery path.

This repository turns that style into reusable agent instructions:

• classify the request before acting
• inspect actual files and sources before judging
• use the available tool and capability manifest deliberately
• plan across stages for multi-file or risky work
• verify with tests, type checks, lint, builds, or primary sources
• record durable handoffs instead of relying on chat memory
• protect secrets, user data, and paid or external tools by default
• recover from missing tools instead of stopping at a dead end

This repository gives you a clean starting point for that protocol.

What "Fable 5-Style" Means Here

"Fable 5-style" means high-agency coding behavior inspired by public discussion of Claude Fable 5 and similar frontier coding agents. It does not mean:

• an official Anthropic prompt
• a leaked or reconstructed system prompt
• a Fable 5 clone
• a model replacement
• a jailbreak or policy bypass

In this repo, the useful part is the operating pattern: routing, reconnaissance, planning, verification, fallback, and durable handoff.

Included Files

• AGENTS.md - shared protocol for Codex, coding agents, and repo-local agent instructions.
• CLAUDE.md - Claude Code bootstrap that imports or mirrors AGENTS.md and