Borrowing it
Nothing to install: this file belongs to cofy-x/axern. 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/cofy-x/axern/main/AGENTS.mdgit clone --depth 1 https://github.com/cofy-x/axernWrote 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/cofy-x/axern/agents-md)<a href="https://agentmods.dev/instructions/cofy-x/axern/agents-md"><img src="https://agentmods.dev/badge/instructions/cofy-x/axern/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/cofy-x/axern/agents-md"><img src="https://agentmods.dev/badge/instructions/cofy-x/axern/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 | $0.00494 | $0.00494 |
| Opus 5.5 | $0.00198 | $0.00198 |
| Sonnet 5.5 | $0.00099 | $0.00099 |
| Haiku 4.5 | $0.00049 | $0.00049 |
Grade A, and why
axern 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.
How it starts
The opening of the file, as written. The whole thing — 22 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Axern Agent Contract
Platform Boundaries
- Axern is a self-hosted execution platform for AI agents. Prioritize Linux single-host serving and continued agent work; macOS is a client and Linux-VM development host. See the Product Direction and Single-Host Architecture Decision for target scope versus implemented capabilities.
- The durable execution model is
Environment -> Run -> Allocation.Sandboxis an SDK facade over that chain; terminal, process, file, SSH, and Tunnel capabilities bind to an explicit, never-reused Allocation ID. - Caller workflows, agent planning, memory, messages, approvals, and semantic retries remain outside Axern. The planned persistent Workspace is a separate data identity, not another execution lifecycle; current writable data remains Allocation-local until the coordinated contract is implemented.
- gVisor/runsc is the sole long-term sandbox backend. Do not introduce another runtime, runtime registry, or fallback. Missing required isolation or platform capability must fail closed.
- PostgreSQL is the only authoritative central state backend. Internal schema changes must update the owning model atomically; do not preserve obsolete internal tables, protobuf gaps, aliases, dual reads, or dual writes unless a published compatibility contract explicitly requires them.
- Keep root deployment contracts cloud-neutral; provider credentials, account setup, and regional orchestration belong outside this repository.
Working Rules
- Read the applicable subtree
AGENTS.md; use the Module Guide to locate owners, Coding Standards for implementation rules, and the Stable Domain Model for public identity or lifecycle changes. - Keep behavior in its owning package, depend on narrow capabilities, and do not add catch-all helpers, bridge aliases, or parallel lifecycle paths.
- Change durable contracts atomically across callers, generated code, tests, and their single authoritative document.
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 Changed · +107 tokens per session b69087e9cf2b
- 1mo ago Changed · -29 tokens per session 00bf571ae507
- 1mo ago Changed · -14 lines · -349 tokens per session 9a47e9718400
- 1mo ago Changed · -1 lines · +62 tokens per session 3827208de9ff
- 1mo ago Changed · -64 lines · -417 tokens per session c1b65e7636f1
- 1mo ago Changed · +13 lines · +195 tokens per session 8dd057f2aac8
- 2mo ago First seen · 88 lines · 925 tokens per session scan A 4a1799c47977
axern AGENTS.md is an instructions file published in the GitHub repository cofy-x/axern (65 stars, last pushed yesterday), licensed Apache-2.0. It adds 494 tokens to every session, about $0.0020 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.
axern AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| axern AGENTS.mdcofy-x/axern | Instructions file | 65 | yesterday | Apache-2.0 | A | 494 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| 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 |
| vscode model-prompts.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 2,022 | GitHub Copilot |