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/lyr1cs/rein/agents-mdgit clone --depth 1 https://github.com/lyr1cs/reinWrote 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/lyr1cs/rein/agents-md)<a href="https://agentmods.dev/instructions/lyr1cs/rein/agents-md"><img src="https://agentmods.dev/badge/instructions/lyr1cs/rein/agents-md.svg" alt="Measured on agentmods" 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 | $0.16935 | $0.16935 |
| Opus 5 | $0.08468 | $0.08468 |
| Sonnet 5 | $0.03387 | $0.03387 |
| Haiku 4.5 | $0.01693 | $0.01693 |
Grade B, and why
rein AGENTS.md scanned grade B with 2 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
- `crates/rein/src/doctor.rs` — new `codex_mcp` check reads `~/.codex/config.toml` and warns when `[mcp_servers.rein]` / legacy `[mcp.rein]` uses a non-loopback `url`, because MCP recall may be served by a different mach Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- Step 3: `env -u REIN_HTTP_TOKEN nohup rein serve --sse > /tmp/rein-sse.log 2>&1 &` — the `env -u` is critical (many setups have `REIN_HTTP_TOKEN` exported in shell so other rein clients authenticate locally; rein inher 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.
- 4d ago First seen · 482 lines · 16,935 tokens per session scan B ff7a6c55d0b7
rein AGENTS.md is an instructions file published in the GitHub repository lyr1cs/rein (9 stars, last pushed 1mo ago), with no licence file. It adds 16,935 tokens to every session, about $0.0847 per session on Opus 5. A static security scan graded it B with 2 findings (reads agent configuration directories, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
litellm-rs AGENTS.md
AGENTS.md instructions for majiayu000/litellm-rs, covering agents.md, workflow, commands and rules.
dense-mem AGENTS.md
AGENTS.md instructions for markhuangai/dense-mem, covering dense-mem repository guidance, project context, architecture decision records, current stack and target architecture.
codesage AGENTS.md
Instructions for iliaal/codesage, covering codesage, build, sanity check before pushing, crate map and search pipeline.
palaia AGENTS.md
AGENTS.md instructions for byte5ai/palaia, covering agent instructions, git workflow, pull requests, project and pre-push hook.
archilles CLAUDE.md
Claude Code instructions for kasssandr/archilles, covering claude.md, project overview, commands, installation and indexing.
ken CLAUDE.md
Claude Code instructions for townsendmerino/ken, covering claude.md, what this is, repository ownership (read this first), commands and embedding parity & golden fixtures (now in aikit).