Borrowing it
Nothing to install: this file belongs to gviiisen/repo-context-ledger. 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/gviiisen/repo-context-ledger/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/gviiisen/repo-context-ledgerWrote 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/gviiisen/repo-context-ledger/copilot-instructions)<a href="https://agentmods.dev/instructions/gviiisen/repo-context-ledger/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/gviiisen/repo-context-ledger/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/gviiisen/repo-context-ledger/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/gviiisen/repo-context-ledger/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 | $0.00372 | $0.00372 |
| Opus 5 | $0.00186 | $0.00186 |
| Sonnet 5 | $0.00074 | $0.00074 |
| Haiku 4.5 | $0.00037 | $0.00037 |
Grade A, and why
repo-context-ledger 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 yesterday.
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.
What it actually says
GitHub Copilot instructions
Repository Context Ledger
Read and follow the repository root AGENTS.md. Use already loaded task context first. For a missing or changed background question, run context --query "<task>" before broad documentation exploration; do not repeat routing for a routine follow-up whose context is sufficient. Read only the Context Bundle's Required reads initially. Never recursively read docs/ai, docs/specs, or docs/changes. Do not open completed Change bodies unless the plan selects one, a required Pack cites one for a named reason, or the user asks for historical reasoning. Required reads are a starting route, not a maximum code-reading limit. Expand context only after stating the unresolved question, and always expand whenever callers, implementations, configuration, persistence, permissions, concurrency, retries, tests, or external boundaries can affect the behavior. A same-window 'continue' on a known active task keeps its session and epoch without another resume. For a real window/tool handover, paused task, or missing task identity, resolve only the missing state and use an owned unique Resume Capsule. Continue the same Ledger session with resume --query "<keywords>" --tool copilot; keep the returned continuation epoch and pass --epoch <n> to later writes. Never read, resume, pause, checkpoint, finish, or invalidate another principal's private session unless an explicit unexpired grant authorizes that exact access. Read-only grants never permit writes. A foreign overlap without a grant permits only Git-tracked Pack/spec/Change guidance. Treat Copilot Memory as a private cache; Git-tracked ledger documents are the shared cross-Agent source of truth. Never message or steer another user-owned task unless the user explicitly requested cross-task coordination.
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.
- yesterday Changed · +56 tokens per session 3e33fcad21f2
- 10d ago First seen · 8 lines · 316 tokens per session scan A 87a4fb7b0d2c
repo-context-ledger copilot-instructions.md is an instructions file published in the GitHub repository gviiisen/repo-context-ledger (105 stars, last pushed 2d ago), licensed MIT. It adds 372 tokens to every session, about $0.0019 per session on Opus 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.
Other instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.