agent-context-os AGENTS.md

agent-context-os AGENTS.md is an instructions file for Codex, OpenCode from conorbronsdon/agent-context-os. It costs 1,065 tokens per session, scanned A, original, MIT.

Repository instructions for Context OS, a system for keeping personal, project, and session context in files. It defines workflows for starting, updating, and ending work, plus rules for routing context and applying approved changes.

In plain words
What is it for?
Use it to start or close a session, save checkpoints, inspect current context, follow ROUTING.md and TODO.md, and run the context doctor when setup may be stale.
Why use it?
It helps an agent recover the right project information across sessions while keeping proposed lifecycle changes reviewable and separate from direct edits.

Instructions file for CodexOpenCode

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/conorbronsdon/agent-context-os/agents-md
Clone the repo
git clone --depth 1 https://github.com/conorbronsdon/agent-context-os

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.

agentmods badge for agent-context-os AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/conorbronsdon/agent-context-os/agents-md.svg)](https://agentmods.dev/instructions/conorbronsdon/agent-context-os/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/conorbronsdon/agent-context-os/agents-md"><img src="https://agentmods.dev/badge/instructions/conorbronsdon/agent-context-os/agents-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,065 This file is loaded in full into every session.
When invoked 1,065 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 $0.01065 $0.01065
Opus 5 $0.00532 $0.00532
Sonnet 5 $0.00213 $0.00213
Haiku 4.5 $0.00106 $0.00106

Measured 4d ago against content hash 9d153d9296f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

agent-context-os 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 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.

AGENTS.md · 100 lines

How it starts

The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Context OS

This repository is the durable source of truth for personal, project, and session context. Keep provider-neutral state here and host-specific behavior in its adapter.

Session lifecycle

  • First-time onboarding: use $setup.
  • Begin work: use $start.
  • Save a mid-session checkpoint: use $update.
  • Close a session: use $end.

Invoke these workflows explicitly with the form documented by the host adapter; this is guidance, not a host-enforced gate. The $context-setup, $context-start, $context-update, and $context-end compatibility names remain supported.

Lifecycle kernel

  • bash scripts/contextos.sh start is the read-only continuity inventory.
  • Setup, update, and end use propose then exact-digest apply; never edit lifecycle state directly.
  • Present every proposal diff. Apply only after explicit approval of that exact proposal and report its receipt.
  • Run bash scripts/contextos.sh doctor when discovery, runtime setup, a lock, or copied skills may be stale.

Context routing

  • Read ROUTING.md before loading task-specific context.
  • Treat TODO.md as the backlog and state/current.md as top-of-mind context.
  • Keep each fact in one canonical file and link to it elsewhere.
  • Load only what the current task needs. Identity and session data may be sensitive.

Safety

  • Follow docs/safety-contract.md before any external write, publish, destructive action, credential change, or permission expansion.
  • Show proposed context changes before broad or destructive rewrites.
  • Never commit or push without explicit approval.
  • Optional integrations stay disabled until chosen and configured; see references/integrations.md for data and side-effect boundaries.

Portability boundary

  • .agents/skills/ contains portable workflow cores.
  • .claude/ contains Claude Code commands, hooks, settings, and memory adapters.
  • .codex/hooks.json maps Codex events to the same read-only policy checks.
  • adapters/hermes/ documents optional Hermes hooks and skill installation.
  • adapters/openclaw/ documents first-class external-plugin OpenClaw support.
  • adapters/cursor/ documents separate experimental Cursor IDE and CLI support.
  • adapters/devin/ documents experimental Devin cloud-session and Review support.
  • Runtime manifests under runtimes/ declare support instead of implying parity.
  • Kernel proposal/apply is the enforcement boundary on every host; hooks are defense in depth and host-local memory is never shared automatically.

Read the full file on GitHub · 100 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 · 100 lines · 1,065 tokens per session scan A 9d153d9296f5

Subscribe to this mod's changes

agent-context-os AGENTS.md is an instructions file published in the GitHub repository conorbronsdon/agent-context-os (21 stars, last pushed today), licensed MIT. It adds 1,065 tokens to every session, about $0.0053 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.