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hier_config: Instructions file for GitHub Copilot

.github/copilot-instructions.md

hier_config copilot-instructions.md is an instructions file for GitHub Copilot from netdevops/hier_config. It costs 576 tokens per session, scanned A, original, MIT.

Repository instructions for reviewing and developing hier_config, a Python library that compares network device configurations and generates minimal repair commands.

In plain words
What is it for?
Use them when implementing or reviewing hier_config code and its tests.
Why use it?
They define project rules for data models, strict typing, immutable data, and tests, including TDD, where tests are written alongside changes.

Instructions file for GitHub Copilot

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

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

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is poetry run ./scripts/build.py lint-and-test # what CI runs.

not rated 152repo 1mo ago A scan 576 tokens original MIT
View source ↗ netdevops/hier_config hier-config.readthedocs.io
Reuse

Borrowing it

Nothing to install: this file belongs to netdevops/hier_config. 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/netdevops/hier_config/master/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/netdevops/hier_config

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 hier_config copilot-instructions.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/netdevops/hier_config/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/netdevops/hier_config/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 hier_config copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/netdevops/hier_config/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/netdevops/hier_config/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 576 This file is loaded in full into every session.
When invoked 576 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 $0.00576 $0.00576
Opus 5.5 $0.00230 $0.00230
Sonnet 5.5 $0.00115 $0.00115
Haiku 4.5 $0.00058 $0.00058

Measured 1mo ago against content hash 4734726d3ee8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hier_config 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 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.

.github/copilot-instructions.md · 32 lines

How it starts

The opening of the file, as written. The whole thing — 32 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot Instructions for hier_config

hier_config is a Python library that compares network device configurations (running vs intended) and generates minimal remediation commands by parsing config text into hierarchical trees. Runtime dependencies are deliberately minimal (pydantic only).

Build & Test

All commands use poetry (not pip):

poetry run ./scripts/build.py lint-and-test   # what CI runs
poetry run ./scripts/build.py pytest --coverage   # 95% coverage floor

Rules to Enforce in Review

  • Pydantic models must subclass the project-local BaseModel from hier_config/models.py (it sets frozen=True, extra="forbid"). Direct use of pydantic.BaseModel is a defect.
  • Model fields use immutable collections only: tuple and frozenset, never list or set. Rule models match config lineage with match_rules: tuple[MatchRule, ...].
  • Strict typing: flag Any, missing annotations (including in tests), and # type: ignore / # noqa comments without a justifying reason. mypy and pyright both run in strict mode.
  • Tests must accompany every code change (the project follows TDD). Tests are flat functions — no test classes (benchmarks excepted). Driver behavior changes belong in tests/test_driver_<platform>.py; config view changes in tests/config_view/.
  • Driver/rule changes need round-trip assertions: build running + intended configs, assert the exact remediation output (dump_simple()), and verify the rollback restores the original (no unified_diff).
  • Fields on HConfigDriverRules (hier_config/platforms/driver_base.py) use named module-level default factory functions, not lambdas.
  • CHANGELOG.md must have an entry under ## [Unreleased] (Keep a Changelog categories: Added/Changed/Fixed/Removed, with an issue/PR reference like (#209)).
  • Docs must be updated when public API or driver behavior changes; new doc pages must be added to mkdocs.yml nav; moved pages need a redirect_maps entry.
  • No loosening of quality gates: reject changes that lower coverage thresholds, disable lint rules, or relax type-checking configuration to make a change pass.
  • No new runtime dependencies without prior discussion in an issue.

Read the full file on GitHub · 32 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. 1mo ago First seen · 32 lines · 576 tokens per session scan A 4734726d3ee8

Subscribe to this mod's changes

hier_config copilot-instructions.md is an instructions file published in the GitHub repository netdevops/hier_config (152 stars, last pushed 1mo ago), licensed MIT. It adds 576 tokens to every session, about $0.0023 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 2026-09-01.

Code reviewTDDTestingconfiguration-managementnetwork-analysisnetwork-programming
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