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elle: Instructions file for Codex

AGENTS.md

elle AGENTS.md is an instructions file for Codex, OpenCode from elle-lisp/elle. It costs 4,388 tokens per session, scanned A, original, MIT.

Repository instructions for Elle, a Lisp programming language whose source code is compiled to bytecode and run by a virtual machine.

In plain words
What is it for?
Understanding Elle’s modules, value types, signals, capabilities, and testing rules while working on the project.
Why use it?
They give a coding agent the project’s architecture, terminology, design rules, and testing expectations so it can make changes that fit the codebase.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is elle-lisp/elle's own configuration. It tells Codex and OpenCode how to work on elle itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything elle configures →

not rated 26repo changed 11d ago A scan 4,388 tokens original MIT
View source ↗ elle-lisp/elle
Reuse

Borrowing it

Nothing to install: this file belongs to elle-lisp/elle. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/elle-lisp/elle/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/elle-lisp/elle

Made for: Codex, OpenCode.

Wrote 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.

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README.md
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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.

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Per session 4,388 This file is loaded in full into every session.
When invoked 4,388 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.04388 $0.04388
Opus 5.5 $0.01755 $0.01755
Sonnet 5.5 $0.00878 $0.00878
Haiku 4.5 $0.00439 $0.00439

Measured 11d ago against content hash 9e10b818884e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

elle 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 11d 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.

AGENTS.md · 339 lines

How it starts

The opening of the file, as written. The whole thing — 339 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Elle

Elle is a Lisp. Source text becomes bytecode; bytecode runs on a VM.

This is not a toy. The implementation targets correctness, performance, and clarity — in that order. We compile through multiple IRs, we have proper lexical scoping with closure capture analysis, and a unified signal/capability system: signals flow up (from callee to caller), capabilities flow down (from parent fiber to child). See signals for the full design.

You are an LLM. You will make mistakes. The test suite will catch them. Run the tests. Read the error messages. They are designed to be helpful.

origin/main is always green. Every commit on main passes every test — the Elle suites, the Rust tests, the documentation examples. CI and a merge queue enforce it. If a test fails on your branch, your branch caused it. "Pre-existing defect" is not a valid explanation when main is green. Fix every failure before merging — no skip lists, no expected failures, no excuses. See CONTRIBUTING.md for the full policy.

DOCUMENTATION.md governs every document and comment here. A document you find wrong is yours: repair it inside the change you are already making, and stamp the file you touched.

Contents

Architecture

Source → Reader → Syntax → Expander → Syntax → Analyzer → HIR → Lowerer → LIR → Emitter → Bytecode → VM

This is the only compilation pipeline. Source locations flow through the entire pipeline: Syntax spans → HIR spans → the span on each LIR node → LocationMap in bytecode. Error messages include file:line:col information.

Read the full file on GitHub · 339 lines

Changes

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.

  1. 11d ago Changed · +1 tokens per session 9e10b818884e
  2. 15d ago Changed · -24 tokens per session 39a9c9548bb8
  3. 17d ago Changed · -3 tokens per session 11d0dece03ea
  4. 21d ago Changed · -2 tokens per session 0aee7b6ccb11
  5. 25d ago Changed · +2 lines · +141 tokens per session ea1184d076d0
  6. 28d ago Changed · +3 tokens per session 8eb03106b988
  7. 1mo ago Changed · +7 tokens per session a5d4ed8c748a
  8. 1mo ago Changed · +6 lines · +182 tokens per session b70f3b8fee33
  9. 1mo ago Changed · +25 tokens per session 8ad40c9d74c2
  10. 1mo ago First seen · 331 lines · 4,058 tokens per session scan A 275cec20f89c

Subscribe to this mod's changes

elle AGENTS.md is an instructions file published in the GitHub repository elle-lisp/elle (26 stars, last pushed yesterday), licensed MIT. It adds 4,388 tokens to every session, about $0.0176 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.

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Related

elle AGENTS.md compared with instructions from other repositories

elle AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
elle AGENTS.mdelle-lisp/elleInstructions file26yesterdayMITA4,388Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA5,516GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchainInstructions file149ktodayMITA4,680Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file275k3d agoMITA4,313Codex, OpenCode