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/coder/xum/agents-mdgit clone --depth 1 https://github.com/coder/xumWhat 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 | $0.00005 | $0.00005 |
| Opus 5 | $0.00003 | $0.00003 |
| Sonnet 5 | $0.00001 | $0.00001 |
| Haiku 4.5 | $0.00001 | $0.00001 |
Grade A, and why
xum 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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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 · 1 lines · 5 tokens per session scan A d00743dc4e87
xum AGENTS.md is an instructions file published in the GitHub repository coder/xum (1,994 stars, last pushed 2d ago), licensed AGPL-3.0. It adds 5 tokens to every session, about $0.0000 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
denova AGENTS.md
Instructions for alfredxw/denova, covering 项目目标, 必须遵守, 项目约定, 代码注意事项 and 前端与交互规范.
stagewise AGENTS.md
AGENTS.md instructions for stagewise-io/stagewise, covering agents.md, essential commands, development, building and code quality.
stagewise CLAUDE.md
Claude Code instructions for stagewise-io/stagewise, a project described as: The Open Source Agentic IDE. Create and orchestrate coding agents, show app previews and run git workflows. Use your favorite models across all providers.
codehydra CLAUDE.md
Instructions for stefanhoelzl/codehydra, covering claude.md, critical rules, no ignore comments, api/ipc interface changes and new boundary interfaces.
neuro-book AGENTS.md
AGENTS.md instructions for notnotype/neuro-book, covering neurobook agent 入口, core rules, 了解开发者, 开发授权与通知 and 仓库结构与文件路由.
neuro-book CLAUDE.md
Claude Code instructions for notnotype/neuro-book, a project described as: An AI-powered IDE for long-form fiction writing, combining software engineering workflows, modern storytelling methodologies, and multi-agent systems.