Ech0 is a self-hosted publishing platform for sharing short posts, links, and media on a personal timeline. It is intended for people who want an independent, lightweight space with optional comments, sharing, and RSS.
Borrowing it
Nothing to install: this file belongs to lin-snow/Ech0. 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/lin-snow/Ech0/main/AGENTS.mdgit clone --depth 1 https://github.com/lin-snow/Ech0Wrote 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/lin-snow/ech0/agents-md)<a href="https://agentmods.dev/instructions/lin-snow/ech0/agents-md"><img src="https://agentmods.dev/badge/instructions/lin-snow/ech0/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/lin-snow/ech0/agents-md"><img src="https://agentmods.dev/badge/instructions/lin-snow/ech0/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 | $0.04239 | $0.04239 |
| Opus 5.5 | $0.01696 | $0.01696 |
| Sonnet 5.5 | $0.00848 | $0.00848 |
| Haiku 4.5 | $0.00424 | $0.00424 |
Grade A, and why
Ech0 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 today.
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.
- today Changed · +1 lines · +182 tokens per session 6e102b030cb6
- yesterday Changed · +1 lines · +170 tokens per session 065a2f060db4
- 10d ago Changed · +15 tokens per session 825662e15f86
- 1mo ago Changed · -18 lines · +2,080 tokens per session b29fb09fd93d
- 2mo ago First seen · 141 lines · 1,792 tokens per session scan A 356e4a49f5e7
Ech0 AGENTS.md is an instructions file published in the GitHub repository lin-snow/Ech0 (2,086 stars, last pushed yesterday), licensed AGPL-3.0. It adds 4,239 tokens to every session, about $0.0170 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.
Ech0 AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| Ech0 AGENTS.mdlin-snow/Ech0 | Instructions file | 2.1k | yesterday | AGPL-3.0 | A | 4,239 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |