Borrowing it
Nothing to install: this file belongs to conorbronsdon/agent-context-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/conorbronsdon/agent-context-os/main/AGENTS.mdgit clone --depth 1 https://github.com/conorbronsdon/agent-context-osWrote 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.
[](https://agentmods.dev/instructions/conorbronsdon/agent-context-os/agents-md)<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/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.
<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="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01145 | $0.01145 |
| Opus 5.5 | $0.00458 | $0.00458 |
| Sonnet 5.5 | $0.00229 | $0.00229 |
| Haiku 4.5 | $0.00114 | $0.00114 |
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 20d 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.
How it starts
The opening of the file, as written. The whole thing — 101 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 startis the read-only continuity inventory.- Setup, update, and end use
proposethen exact-digestapply; 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 doctorwhen discovery, runtime setup, a lock, or copied skills may be stale.
Context routing
- Read
ROUTING.mdbefore loading task-specific context. - Treat
TODO.mdas the backlog andstate/current.mdas 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.mdbefore 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.mdfor 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.jsonmaps Codex events to the same read-only policy checks..devin/hooks.v1.jsonmaps Devin CLI events to the same advisory checks.adapters/hermes/documents first-class CLI support, optional hooks, and skill installation.adapters/openclaw/andadapters/opencode/document first-class host support.adapters/cursor/documents first-class Cursor CLI and experimental IDE support.adapters/devin/documents first-class Devin CLI and cloud-session support, plus Review.- 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.
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.
- 20d ago Changed · -1 tokens per session d5b59a462749
- 21d ago Changed · +20 tokens per session 6ec7f6370714
- 29d ago Changed · +6 tokens per session 73f6840194fe
- 1mo ago Changed · +1 lines · +51 tokens per session 1eff1137386b
- 1mo ago Changed · +4 tokens per session 45f5662a2168
- 1mo ago First seen · 100 lines · 1,065 tokens per session scan A 9d153d9296f5
agent-context-os AGENTS.md is an instructions file published in the GitHub repository conorbronsdon/agent-context-os (30 stars, last pushed yesterday), licensed MIT. It adds 1,145 tokens to every session, about $0.0046 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.