What is hexaFn copilot-instructions.md?

A set of GitHub Copilot instructions for hexaFn, a modular event-driven function pipeline framework. It documents the project architecture, lifecycle flow, and module boundaries.

It guides work across the framework's domains, application services, contracts, events, and other Rust modules.

It gives a coding assistant the project context and structural rules needed to make changes that fit the existing design.

How hTuneSys/hexaFn configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to hTuneSys/hexaFn. 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/hTuneSys/hexaFn/develop/.github/copilot-instructions.md

Clone the repo

git clone --depth 1 https://github.com/hTuneSys/hexaFn

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/htunesys/hexafn/copilot-instructions/github.svg)](https://agentmods.dev/instructions/htunesys/hexafn/copilot-instructions)

Your own site

<a href="https://agentmods.dev/instructions/htunesys/hexafn/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/htunesys/hexafn/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/htunesys/hexafn/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/htunesys/hexafn/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,380 This file is loaded in full into every session.

When invoked 2,380 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.

Model	Per session	Once invoked
Fable 5.1	$0.02380	$0.02380
Opus 5.5	$0.00952	$0.00952
Sonnet 5.5	$0.00476	$0.00476
Haiku 4.5	$0.00238	$0.00238

Measured 2mo ago against content hash 76d4906ab822, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hexaFn copilot-instructions.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 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.

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.

.github/copilot-instructions.md · 263 lines

How it starts

The opening of the file, as written. The whole thing — 263 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot Instructions for hexaFn

⚡ PROJECT OVERVIEW

hexaFn is a modular, event-driven function pipeline framework powered by the 6F Lifecycle Flow: Feed → Filter → Format → Function → Forward → Feedback. This project follows Hexagonal Architecture (Ports & Adapters) with Domain-Driven Design (DDD) principles.

Company: hexaTune LLC
Maintainer: Husamettin ARABACI (@husamettinarabaci)
License: MIT (SPDX-compliant, REUSE Spec 3.3 compatible)
Repository: https://github.com/hTuneSys/hexaFn

🚨 CRITICAL ARCHITECTURE REQUIREMENTS

Hexagonal Architecture Structure (for all modules EXCEPT hexafn-core and hexafn-macros)

crates/<domain>/src/
├── domain/              # Core business rules (entities, value objects, domain services)
│   ├── entities/        # Aggregates and core business objects with identity
│   ├── value_objects/   # Immutable value types without identity
│   ├── events/          # Domain events for cross-domain communication
│   ├── services/        # Domain services containing business logic
│   └── contracts/       # Domain contracts and interfaces
├── application/         # Use cases, application services, port definitions
│   ├── commands/        # State-changing operations (CQRS Commands)
│   ├── queries/         # Read operations (CQRS Queries)
│   ├── ports/           # Interface definitions (dependency inversion)
│   └── services/        # Application orchestration services
├── infrastructure/      # Concrete implementations of output ports
│   ├── persistence/     # Database adapters, repositories
│   ├── messaging/       # Event publishing, message queue adapters
│   └── external/        # External API clients, third-party integrations
└── lib.rs               # Crate entry point (re-exports and public API)

6F Lifecycle Flow Integration

Feed: Ingest from external sources (events, APIs, queues)
Filter: Pre-condition checks and gating
Format: Normalize, transform, validate
Function: Execute logic with user-defined behavior
Forward: Route results to KV stores, topics, services
Feedback: Log, trace, trigger, or audit

Read the full file on GitHub · 263 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.

2mo ago First seen · 263 lines · 2,380 tokens per session scan A 76d4906ab822

Subscribe to this mod's changes

hexaFn copilot-instructions.md is an instructions file published in the GitHub repository hTuneSys/hexaFn (11 stars, last pushed 1y ago), licensed MIT. It adds 2,380 tokens to every session, about $0.0095 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 2026-09-04.

Building agents Languages Rust automation event-driven hexafn key-value-store pubsub

hexaFn copilot-instructions.md next to 6 instructions from other repositories
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hexaFn: Instructions file for GitHub Copilot