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hecate: Instructions file for GitHub Copilot

.github/instructions/backend.instructions.md

hecate backend.instructions.md is an instructions file for GitHub Copilot from hecatehq/hecate. It costs 212 tokens per session, scanned A, original, MIT.

A set of project instructions for Go backend and runtime work in Hecate, a local operator console. It defines required documents, safe system interfaces, data rules, observability, and testing.

In plain words
What is it for?
Use it when changing Hecate's Go backend or runtime, including storage behavior, subprocesses, events, request paths, authentication assumptions, and related tests.
Why use it?
It gives contributors a consistent way to change backend code without bypassing the project's file, process, database, or event-handling boundaries.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file. Also seen: mentions AGENTS.md.

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

not rated 24repo +1 yesterday A scan 212 tokens original MIT
View source ↗ hecatehq/hecate hecate.sh
Reuse

Borrowing it

Nothing to install: this file belongs to hecatehq/hecate. 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/hecatehq/hecate/master/.github/instructions/backend.instructions.md
Clone the repo
git clone --depth 1 https://github.com/hecatehq/hecate

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 hecate backend.instructions.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/hecatehq/hecate/backend"><img src="https://agentmods.dev/badge/instructions/hecatehq/hecate/backend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 212 This file is loaded in full into every session.
When invoked 212 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 $0.00212 $0.00212
Opus 5.5 $0.00085 $0.00085
Sonnet 5.5 $0.00042 $0.00042
Haiku 4.5 $0.00021 $0.00021

Measured 2mo ago against content hash e894e4d76673, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hecate backend.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/instructions/backend.instructions.md · 23 lines

What it actually says

Backend Runtime

For Go backend/runtime work, read AGENTS.md plus docs-ai/skills/backend/SKILL.md. Use docs-ai/core/verification.md for the verification ladder.

High-signal rules:

  • Workspace-bound file/search/write behavior goes through WorkspaceFS; subprocesses go through ProcessRunner, GitRunner, or the sandbox seams.
  • Mirror persisted behavior across memory and sqlite backends.
  • Run events are append-only and use the runtime event seams; document new event types in docs/runtime/events.md.
  • Store money as int64 micro-USD, never floats.
  • Add OTel spans/attributes for new request or runtime paths.
  • Do not introduce auth, tenant, or remote-multi-user assumptions; Hecate is a local operator console.
  • Add unit tests and e2e tests for backend behavior changes.
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 · 23 lines · 212 tokens per session scan A e894e4d76673

Subscribe to this mod's changes

hecate backend.instructions.md is an instructions file published in the GitHub repository hecatehq/hecate (24 stars, last pushed yesterday), licensed MIT. It adds 212 tokens to every session, about $0.0008 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.

Backend and APIsLLMaiai-gatewayai-runtimemcp-clientopentelemetry
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