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.
npx agentmods add instructions/onebrain-ai/onebrain/agents-mdgit clone --depth 1 https://github.com/onebrain-ai/onebrainWhat 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 | $0.00243 | $0.00243 |
| Opus 5 | $0.00121 | $0.00121 |
| Sonnet 5 | $0.00049 | $0.00049 |
| Haiku 4.5 | $0.00024 | $0.00024 |
Grade A, and why
onebrain 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 2d 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.
What it actually says
OneBrain — Codex CLI
OneBrain is a personal AI OS built on a plain-Markdown vault — use its built-in web UI. INSTRUCTIONS.md is written using Claude Code tool names — the mapping below translates them to Codex CLI equivalents and explains how to dispatch sub-agents for skills that require parallel execution.
Load Order
- Tool mapping — translates Claude Code tool names to Codex CLI equivalents, and maps
Agentdispatch tospawn_agent - Shared agent instructions — vault structure, skills, session behavior, and personality
Tool Name Mapping
@.claude/plugins/onebrain/references/codex-tools.md
Read .claude/plugins/onebrain/references/codex-tools.md completely before
using any OneBrain workflow. The @ line above is documentation, not a
guarantee that the Codex host expands file imports.
Agent Instructions
@.claude/plugins/onebrain/INSTRUCTIONS.md
Then read .claude/plugins/onebrain/INSTRUCTIONS.md completely and apply its
vault configuration and session rules. Do not rely on @file expansion alone.
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.
- 2d ago First seen · 26 lines · 243 tokens per session scan A 8e21b2aac3ac
onebrain AGENTS.md is an instructions file published in the GitHub repository onebrain-ai/onebrain (25 stars, last pushed 4d ago), licensed Apache-2.0. It adds 243 tokens to every session, about $0.0012 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.
Other instructions, from other repositories
obsidian-mind CLAUDE.md
Claude Code instructions for breferrari/obsidian-mind, covering obsidian mind, skills & capabilities, custom slash commands, vault structure and obsidian cli.
obsidian-mind AGENTS.md
AGENTS.md instructions for breferrari/obsidian-mind, covering obsidian mind, hooks, commands, memory and reaching this vault from another repo.
pi-llm-wiki AGENTS.md
Instructions for zosmaai/pi-llm-wiki, covering agents.md, project, tech stack, file layout and conventions.
DeepPaperNote AGENTS.md
Instructions for 917Dhj/DeepPaperNote, covering deeppapernote agent guide, repository purpose, canonical sources, non-negotiable product invariants and repository structure.
DeepPaperNote CLAUDE.md
Instructions for 917Dhj/DeepPaperNote, covering claude code integration and skill invocation.
obsidian-llm-hub CLAUDE.md
Instructions for takeshy/obsidian-llm-hub, covering claude.md, project overview, build commands, version bumping and architecture.