agentmods.dev

lex: Instructions file for GitHub Copilot

.github/copilot-instructions.md

lex copilot-instructions.md is an instructions file for GitHub Copilot from Guffawaffle/lex. It costs 661 tokens per session, scanned C, original, MIT.

A set of instructions for GitHub Copilot agents working on the Lex repository. It describes commands for recalling and storing memory, checking policy compliance, and following repository rules.

In plain words
What is it for?
Use it when working on Guffawaffle/lex to retrieve prior context, follow canonical terms and architecture decisions, validate policy compliance, and handle approved merges.
Why use it?
It gives the agent repository-specific context and boundaries before it explores files or changes code.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is Guffawaffle/lex's own configuration. It tells GitHub Copilot how to work on lex 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 lex configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is # "include": ["*.ts", "**/*.ts", "../newfile.ts"].

not rated 0repo 2mo ago C scan 661 tokens original MIT
View source ↗ Guffawaffle/lex
Reuse

Borrowing it

Nothing to install: this file belongs to Guffawaffle/lex. 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/Guffawaffle/lex/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/Guffawaffle/lex

Made for: GitHub Copilot.

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.

agentmods badge for lex copilot-instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/guffawaffle/lex/copilot-instructions/github.svg)](https://agentmods.dev/instructions/guffawaffle/lex/copilot-instructions)
Your own site
<a href="https://agentmods.dev/instructions/guffawaffle/lex/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/guffawaffle/lex/copilot-instructions/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.

agentmods 80×15 button for lex copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/guffawaffle/lex/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/guffawaffle/lex/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 661 This file is loaded in full into every session.
When invoked 661 The same file — it is already loaded in full.
Security scan C 1 finding. 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 $0.00661 $0.00661
Opus 5.5 $0.00264 $0.00264
Sonnet 5.5 $0.00132 $0.00132
Haiku 4.5 $0.00066 $0.00066

Measured 2mo ago against content hash 97f835e85479, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

lex copilot-instructions.md scanned grade C with 1 finding 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 2mo 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- This block is auto-generated by `lex instructions generate`. Do not edit manually. -->
.github/copilot-instructions.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot Instructions for Lex

Lex Instructions

Use Lex Memory. Before starting work, run lex recall "topic" to retrieve prior context.

Core Commands

lex recall "topic"     # Retrieve relevant context before work
lex remember           # Store context after completing work
lex timeline           # View recent work history
lex check              # Validate policy compliance

Key Principle

Lex is the constitution, not the government. Schemas, contracts, and memory are stable surfaces. Don't leak implementation details into them.

  • docs/FOUNDERS_NOTE.md — Philosophy
  • docs/CONTRACT_SURFACE.md — Contract surface (v1)
  • canon/policy/lexmap.policy.json — Module boundaries

Run lex recall for detailed guidance on any topic.

🔐 Admin Authority

Copilot agents have delegated --admin merge authority when local CI passes. Run lex recall "admin authority" for conditions.

🎭 Behavioral Layer (LexSona)

Persona execution is handled by LexSona (separate package). Lex provides the behavioral memory socket (recordCorrection, getRules).

For persona-based workflows, see LexSona documentation.

⚠️ Critical Rules

Run lex recall for detailed guidance on:

  • lex recall "git tests" — NO git commits in tests (GPG signing hangs)
  • lex recall "sql safety" — Curated query modules only (see TROUBLESHOOTING.md "SQL Safety Violations")
  • lex recall "ip boundary" — Lex never imports from lexrunner

SQL Safety Quick Reference:

  • All db.prepare() calls must be in curated query modules (see test/sql-safety.test.ts)
  • If you get a SQL safety test failure, see TROUBLESHOOTING.md for refactor examples
  • Never use string interpolation for SQL queries - always use parameterized queries

🏗️ TypeScript Composite Projects

This repo uses TypeScript project references (composite projects). When adding new .ts files:

Read the full file on GitHub · 96 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. 2mo ago First seen · 96 lines · 661 tokens per session scan C 97f835e85479

Subscribe to this mod's changes

lex copilot-instructions.md is an instructions file published in the GitHub repository Guffawaffle/lex (0 stars, last pushed 2mo ago), licensed MIT. It adds 661 tokens to every session, about $0.0026 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agentsMemory and context
Related

lex copilot-instructions.md compared with instructions from other repositories

lex copilot-instructions.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
lex copilot-instructions.mdGuffawaffle/lexInstructions file02mo agoMITC661GitHub Copilot
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode