What is search-engine-core env-config.instructions.md?

Rules for reading configuration from environment variables and supplying it through Docker Compose or a .env file. Environment variables are settings provided outside the program, such as database URLs and log levels.

Use it when adding settings, parsing booleans or numbers, configuring services, or changing Docker-based deployments.

They provide predictable configuration across local and containerized environments without committing credentials to the repository.

How hatefsystems/search-engine-core configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to hatefsystems/search-engine-core. 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/hatefsystems/search-engine-core/master/.github/instructions/env-config.instructions.md

Clone the repo

git clone --depth 1 https://github.com/hatefsystems/search-engine-core

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/hatefsystems/search-engine-core/env-config/github.svg)](https://agentmods.dev/instructions/hatefsystems/search-engine-core/env-config)

Your own site

<a href="https://agentmods.dev/instructions/hatefsystems/search-engine-core/env-config"><img src="https://agentmods.dev/badge/instructions/hatefsystems/search-engine-core/env-config/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/hatefsystems/search-engine-core/env-config"><img src="https://agentmods.dev/badge/instructions/hatefsystems/search-engine-core/env-config.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 347 This file is loaded in full into every session.

When invoked 347 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	$0.00347	$0.00347
Opus 5.5	$0.00139	$0.00139
Sonnet 5.5	$0.00069	$0.00069
Haiku 4.5	$0.00035	$0.00035

Measured 2mo ago against content hash 803e6508ca28, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

search-engine-core env-config.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/env-config.instructions.md · 49 lines

What it actually says

Environment Variable Configuration

Use std::getenv() for configuration (works with Docker Compose and .env).

const char* host = std::getenv("SMTP_HOST");
config.smtpHost = host ? host : "smtp.gmail.com";
// Boolean: compare to "true", "1", "yes" (case-insensitive)
// Integer: std::stoi with try/catch and default

Do not create custom .env parser classes.
Containers: core, mongodb_test, redis, browserless.
Critical: LOG_LEVEL, MONGODB_URI, REDIS_URL, BROWSERLESS_URL.
Never commit .env with credentials; use Docker secrets in production.

Configuration Priority

Docker environment (highest)
.env file (Docker Compose fallback)
Default values in code

Docker Compose Pattern

environment:
  - SMTP_HOST=${SMTP_HOST:-smtp.gmail.com}
  - SMTP_PORT=${SMTP_PORT:-587}
  - SMTP_USE_TLS=${SMTP_USE_TLS:-true}

Boolean/Integer Parsing

// Boolean: compare to "true", "1", "yes" (case-insensitive)
// Integer: std::stoi with try/catch and default
const char* port = std::getenv("SMTP_PORT");
try {
    config.smtpPort = port ? std::stoi(port) : 587;
} catch (const std::exception& e) {
    LOG_WARNING("Invalid SMTP_PORT, using default: 587");
    config.smtpPort = 587;
}

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 · 49 lines · 347 tokens per session scan A 803e6508ca28

Subscribe to this mod's changes

search-engine-core env-config.instructions.md is an instructions file published in the GitHub repository hatefsystems/search-engine-core (5 stars, last pushed yesterday), licensed Apache-2.0. It adds 347 tokens to every session, about $0.0014 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 2026-08-31.

Containers DevOps and cloud c-plus-plus hatef search-engine

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search-engine-core: Instructions file for GitHub Copilot