Puter is an open-source, self-hostable internet computer that provides web-based apps and services such as storage, databases, AI, and serverless workers. It is intended for people who want an online workspace and for developers building and publishing web apps and games.
Borrowing it
Nothing to install: this file belongs to HeyPuter/puter. 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/HeyPuter/puter/main/AGENTS.mdgit clone --depth 1 https://github.com/HeyPuter/puterWrote 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/heyputer/puter/agents-md)<a href="https://agentmods.dev/instructions/heyputer/puter/agents-md"><img src="https://agentmods.dev/badge/instructions/heyputer/puter/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/heyputer/puter/agents-md"><img src="https://agentmods.dev/badge/instructions/heyputer/puter/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 | $0.06727 | $0.06727 |
| Opus 5.5 | $0.02691 | $0.02691 |
| Sonnet 5.5 | $0.01345 | $0.01345 |
| Haiku 4.5 | $0.00673 | $0.00673 |
Grade A, and why
puter 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 · +27 lines · +844 tokens per session 0bb429d82294
- 5d ago Changed · -13 tokens per session f0ba50ad75b3
- 11d ago Changed · +1 lines · +101 tokens per session 94a385a71b66
- 12d ago Changed · +1 lines · +80 tokens per session b9c34d303acb
- 23d ago Changed · +45 lines · +1,726 tokens per session 610df1ad4db6
- 24d ago Changed · -43 lines · -919 tokens per session 058db780b058
- 26d ago Changed · +16 lines · +431 tokens per session 263fd2a555cb
- 1mo ago Changed · +2 lines · +42 tokens per session d84f662a8946
- 1mo ago Changed · +30 lines · +249 tokens per session 5ab716524b58
- 2mo ago First seen · 155 lines · 4,186 tokens per session scan A 7cd85125a69a
puter AGENTS.md is an instructions file published in the GitHub repository HeyPuter/puter (44,094 stars, last pushed today), licensed AGPL-3.0. It adds 6,727 tokens to every session, about $0.0269 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.
puter AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| puter AGENTS.mdHeyPuter/puter | Instructions file | 44k | today | AGPL-3.0 | A | 6,727 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |