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/ishands/upstack/agents-mdgit clone --depth 1 https://github.com/ishands/upstackWhat 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 | $0.02364 | $0.02364 |
| Opus 5 | $0.01182 | $0.01182 |
| Sonnet 5 | $0.00473 | $0.00473 |
| Haiku 4.5 | $0.00236 | $0.00236 |
Grade A, and why
upstack 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 yesterday.
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
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- yesterday First seen · 234 lines · 2,364 tokens per session scan A 26405eb4be91
upstack AGENTS.md is an instructions file published in the GitHub repository ishands/upstack (4 stars, last pushed 4mo ago), with no licence file. It adds 2,364 tokens to every session, about $0.0118 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 2026-08-31.
Other instructions, from other repositories
learn-anything CLAUDE.md
Instructions for ChenChenyaqi/learn-anything, covering claude.md, project overview, commands, per-package commands and architecture (monorepo).
zero2Agent AGENTS.md
Instructions for ranxi2001/zero2Agent, covering zero2agent repository guide, purpose, start every task, source of truth and repository skills.
Clew CLAUDE.md
Instructions for miuuyy/Clew, covering claude.md, read first, product overview, core boundaries and engineering rules.
claude-tutor CLAUDE.md
Instructions for kirilxd/claude-tutor, covering claude.md, what this is, testing, architecture and data layout.
teach-me CLAUDE.md
Instructions for smileynet/teach-me, covering claude.md — teach-me, what this project does, first contact, skills (in .agents/skills/) and key commands.
claude-teacher-plugin CLAUDE.md
Instructions for yarikleto/claude-teacher-plugin, covering claude teacher plugin — developer guide, versioning, how to update the plugin (for users), repository structure and hook rules.