Borrowing it
Nothing to install: this file belongs to PriorLabs/relarena. 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/PriorLabs/relarena/main/AGENTS.mdgit clone --depth 1 https://github.com/PriorLabs/relarenaWrote 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/priorlabs/relarena/agents-md)<a href="https://agentmods.dev/instructions/priorlabs/relarena/agents-md"><img src="https://agentmods.dev/badge/instructions/priorlabs/relarena/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/priorlabs/relarena/agents-md"><img src="https://agentmods.dev/badge/instructions/priorlabs/relarena/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 | $0.01703 | $0.01703 |
| Opus 5.5 | $0.00681 | $0.00681 |
| Sonnet 5.5 | $0.00341 | $0.00341 |
| Haiku 4.5 | $0.00170 | $0.00170 |
Grade A, and why
relarena 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 1mo 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.
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 — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
relarena — agent notes
Start with the README for what the package is and how a run works.
This repo is public
Everything committed here is published under Apache-2.0 — code, docs, and
baseline_results/ alike. Nothing may reference Prior Labs–internal
infrastructure, systems, names, or paths. This applies to everything pushed
to the remote, not just tracked files: commit messages, branch names, and PR
text included.
CI is the trust boundary
When a change touches .github/, tell the user that the PR will need approval
from release-maintainers before merging. Preparing, committing, pushing, and
opening the PR are allowed before that approval.
Prefer putting workflow changes in a small, separate PR so release maintainers can review them easily. This is a recommendation, not a requirement; keep related changes together when splitting would make review harder. Never bypass the required approval to merge.
Ordinary code review can be bypassed by relational maintainers, so .github/
is where secrets are guarded:
- A workflow step with access to a secret or an OIDC token may only run
pinned actions or scripts under
.github/scripts/. It must not run the package, the tests, or anything else outside.github/, since all of that would execute with the secret in its environment. - Scripts under
.github/scripts/are standalone: standard library or explicitly pinned dependencies, no imports fromrelarena. - Scripts under
workflows/are ordinary maintenance tooling under the normal review rules. Move a script into.github/scripts/before a secret-bearing step calls it.
Reviewers of a workflow change check every step that references
secrets.* or requests id-token: write against these rules.
Adding or changing a model
Read docs/adding-a-model.md first. Model development
is two things: the model folder (layout, fit/predict contract and its
datatypes, search-space choices, shared-code placement, optional dependencies,
vendoring, tests) and — for methods with expensive CPU pre-processing — a
public cache-warm script. models/lightgbm/ is the smallest complete example
to copy.
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.
- 1mo ago Changed · +6 lines · +66 tokens per session d5eda82f919e
- 1mo ago Changed · +12 lines · +164 tokens per session a6b2b1278aac
- 1mo ago Changed · +19 lines · +215 tokens per session 1510d5849492
- 2mo ago Changed · +8 lines · +76 tokens per session f3ba91c837d0
- 2mo ago First seen · 86 lines · 1,182 tokens per session scan A 4453c6a82f20
relarena AGENTS.md is an instructions file published in the GitHub repository PriorLabs/relarena (74 stars, last pushed yesterday), licensed Apache-2.0. It adds 1,703 tokens to every session, about $0.0068 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.
relarena AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| relarena AGENTS.mdPriorLabs/relarena | Instructions file | 74 | yesterday | Apache-2.0 | A | 1,703 | 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 | yesterday | 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 |