Borrowing it
Nothing to install: this file belongs to ministryofjustice/CFO-DataManagementSystem. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/ministryofjustice/CFO-DataManagementSystem/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/ministryofjustice/CFO-DataManagementSystemWrote 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.
[](https://agentmods.dev/instructions/ministryofjustice/cfo-datamanagementsystem/copilot-instructions)<a href="https://agentmods.dev/instructions/ministryofjustice/cfo-datamanagementsystem/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/ministryofjustice/cfo-datamanagementsystem/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.
<a href="https://agentmods.dev/instructions/ministryofjustice/cfo-datamanagementsystem/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/ministryofjustice/cfo-datamanagementsystem/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.02031 | $0.02031 |
| Opus 5.5 | $0.00812 | $0.00812 |
| Sonnet 5.5 | $0.00406 | $0.00406 |
| Haiku 4.5 | $0.00203 | $0.00203 |
Grade A, and why
CFO-DataManagementSystem 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 27d 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.
How it starts
The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GitHub Copilot Instructions
Project Overview
HMPPS CFO Data Management System (DMS) — a .NET 10 distributed microservices application that processes p-NOMIS (Offloc) and nDelius offender data to supply CATS (Case Assessment and Tracking System) with accurate offender records. Targets Windows Server EC2 (deployed as Windows Services) and runs locally via .NET Aspire.
Build, Test & Run
# Build the solution
dotnet build
# Run all tests
dotnet test --configuration Release
# Run tests for a specific project
dotnet test tests/Matching.Engine.Tests/Matching.Engine.Tests.csproj --configuration Release
# Run a single test
dotnet test tests/Api.Tests/Api.Tests.csproj --filter "FullyQualifiedName~SearchAsync_WithNoMatches_ReturnsNotFound"
# Run locally via Aspire (recommended — starts all services + dependencies)
# VS Code: F5 → Default Configuration
# Visual Studio: select "Aspire.AppHost" debug config
# Deploy databases to a test environment
export SERVER="..." DB_USER="..." DB_PASS="..."
python3 publish_db.py # deploy
python3 publish_db.py --dry-run # preview only
# Seed test data
dotnet run --project ./src/FakeDataSeeder/FakeDataSeeder.csproj
Architecture
Data Pipeline
FileSync → [Offloc.Cleaner → Offloc.Parser | Delius.Parser] → Import → DbInteractions → Blocking → Matching.Engine → API / Visualiser
All inter-service communication is asynchronous via RabbitMQ using the Rebus library. Each stage publishes a *FinishedMessage that triggers the next stage.
Services
| Service | Type | Role |
|---|---|---|
FileSync |
Worker | Monitors MinIO/S3/filesystem for incoming files |
Offloc.Cleaner |
Worker | Cleans raw Offloc (p-NOMIS) files |
Offloc.Parser |
Worker | Parses cleaned Offloc files into DB records |
Delius.Parser |
Worker | Parses nDelius files into DB records |
Import |
Worker | Coordinates staging → running picture migration |
DbInteractions |
Worker | Executes DB staging/merge operations (runs in SQL container) |
Blocking |
Worker | Generates candidate record pairs for matching |
Matching.Engine |
Worker | Compares pairs (Comparator), scores (Scorer, Bayesian), clusters |
Cleanup |
Worker | Data maintenance |
Logging |
Worker | Centralised log aggregation |
Meow |
Worker | CATS RabbitMQ integration (different broker config) |
API |
ASP.NET Core | REST endpoints for downstream consumers |
Visualiser |
ASP.NET Core | Blazor web UI for exploring offender relationships |
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.
- 27d ago First seen · 162 lines · 2,031 tokens per session scan A 18c06a3c0a27
CFO-DataManagementSystem copilot-instructions.md is an instructions file published in the GitHub repository ministryofjustice/CFO-DataManagementSystem (7 stars, last pushed 5d ago), licensed MIT. It adds 2,031 tokens to every session, about $0.0081 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 2026-10-02.
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