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rosetta: Instructions file for GitHub Copilot

.github/copilot-instructions.md

rosetta copilot-instructions.md is an instructions file for GitHub Copilot from tikoci/rosetta. It costs 412 tokens per session, scanned A, original, MIT.

Instructions for GitHub Copilot working in the Rosetta software project. They summarize the project structure and direct Copilot to the documents containing design, operational and coding rules.

In plain words
What is it for?
Orienting Copilot, choosing the right project documentation, and applying broad or area-specific rules when changing the codebase.
Why use it?
They help Copilot find the right guidance for each type of task without copying every rule into one file.

Instructions file for GitHub Copilot

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

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

not rated 51repo +2 today A scan 412 tokens original MIT
View source ↗ tikoci/rosetta tikoci.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to tikoci/rosetta. 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/tikoci/rosetta/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/tikoci/rosetta

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 rosetta copilot-instructions.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/tikoci/rosetta/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/tikoci/rosetta/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 412 This file is loaded in full into every session.
When invoked 412 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 $0.00412 $0.00412
Opus 5.5 $0.00165 $0.00165
Sonnet 5.5 $0.00082 $0.00082
Haiku 4.5 $0.00041 $0.00041

Measured 1mo ago against content hash eafda34a202c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rosetta 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 · 36 lines

What it actually says

Copilot instructions for rosetta

GitHub Copilot reads this file plus matching .github/instructions/*.instructions.md files. Keep this file short; put actual rules in the narrow instruction files.

Project snapshot

  • Bun + TypeScript, with Bun-native runtime APIs (bun:sqlite, Bun.serve, bunx).
  • One core data model, exposed as MCP + browse TUI + glossary/command-tree surfaces.
  • CLAUDE.md is now only the orientation + routing index. Rationale lives in DESIGN.md; operator/reference material lives in MANUAL.md.

Routing map

  • CLAUDE.md — project orientation and "where does this go?" index.
  • AGENTS.md — Codex-specific routing note.
  • DESIGN.md — durable rationale, data-source provenance, architecture tradeoffs.
  • MANUAL.md — install, release/re-extraction operations, CLI/HTTP reference, schema.
  • GitHub Issues — the active work queue (agent-ready / umbrella / blocked labels). tasks/ is a frozen archive; tasks/README.md / briefings/README.md hold the directory-local rules.
  • .github/instructions/*.instructions.md — narrow normative rules selected by applyTo.

Start with these broad rules

  • where-does-this-go.instructions.md
  • issue-pr-linking.instructions.md
  • changelog-discipline.instructions.md
  • capture-undone-work.instructions.md
  • ci-pickup-verification.instructions.md
  • instruction-scopes.instructions.md

Surface-specific rules

  • MCP/query/TUI/canonicalizer → mcp-server.instructions.md
  • Extraction/data-shape work → extraction.instructions.md
  • Database init/schema internals → database.instructions.md

Prefer pointers over repetition. If you are about to add a long rule here, it probably belongs in a new scoped instruction file instead.

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 · 36 lines · 412 tokens per session scan A eafda34a202c

Subscribe to this mod's changes

rosetta copilot-instructions.md is an instructions file published in the GitHub repository tikoci/rosetta (51 stars, last pushed today), licensed MIT. It adds 412 tokens to every session, about $0.0016 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.

Claude Codeaibuncopilotmcpmcp-server
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