Borrowing it
Nothing to install: this file belongs to backendforth/next-sanity-starter. 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/backendforth/next-sanity-starter/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/backendforth/next-sanity-starterWrote 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/backendforth/next-sanity-starter/copilot-instructions)<a href="https://agentmods.dev/instructions/backendforth/next-sanity-starter/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/backendforth/next-sanity-starter/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/backendforth/next-sanity-starter/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/backendforth/next-sanity-starter/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 | $0.00359 | $0.00359 |
| Opus 5.5 | $0.00144 | $0.00144 |
| Sonnet 5.5 | $0.00072 | $0.00072 |
| Haiku 4.5 | $0.00036 | $0.00036 |
Grade A, and why
next-sanity-starter 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 17d 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.
What it actually says
GitHub Copilot — repository instructions
AGENTS.md at the repo root holds this repo's guardrails: the module pattern, generated Sanity types, i18n, commands and the definition of done. Read it before suggesting a change; the per-folder README.md files are the deep docs it links to.
Two long-lived branches differ in one thing, where a locale lives: in the field on main, in the document on variant/document-level. Check the branch (git rev-parse --abbrev-ref HEAD) and read AGENTS.md → "Branch-specific notes" before touching locale code. Fixes land on main first and reach the variant by git cherry-pick -x; every PR names its Variant-Port. A project copied from the starter has main (production) and development (staging) instead and no Variant-Port; its AGENTS.md → "This repository" says so.
Copilot code review reads only this file, so the rules a review most often needs are repeated here (AGENTS.md has the reasons):
- Never edit generated files (
*.gen.*,studio/schema.json);pnpm generatewrites them and CI fails on a diff. - Full queries go through
defineQuery; no function calls inside a query, noason Sanity data. - Compare a fetched string to a literal only through
stegaClean/isStegaVariant; never clean a whole rendered document. - A module is wired in six places (
pnpm check:wiringchecks them); schema and component land in one commit. - Locale handling differs by branch — judge it against AGENTS.md "Branch-specific notes", not against the other branch.
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.
- 17d ago Changed · +40 tokens per session 8d6208b0b7a7
- 22d ago Changed · -46 lines · -696 tokens per session 3e5f95d75cb5
- 23d ago Changed · +36 tokens per session 7be19dfa4c4e
- 2mo ago First seen · 60 lines · 979 tokens per session scan A 5b761512add1
next-sanity-starter copilot-instructions.md is an instructions file published in the GitHub repository backendforth/next-sanity-starter (4 stars, last pushed 2d ago), licensed ISC. It adds 359 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.
next-sanity-starter copilot-instructions.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| next-sanity-starter copilot-instructions.mdbackendforth/next-sanity-starter | Instructions file | 4 | 2d ago | ISC | A | 359 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |