Borrowing it
Nothing to install: this file belongs to beel-collab/presets.dev. 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/beel-collab/presets.dev/main/release/express/native/copilot/.github/instructions/express.instructions.mdgit clone --depth 1 https://github.com/beel-collab/presets.devWrote 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/beel-collab/presets.dev/express)<a href="https://agentmods.dev/instructions/beel-collab/presets.dev/express"><img src="https://agentmods.dev/badge/instructions/beel-collab/presets.dev/express/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/beel-collab/presets.dev/express"><img src="https://agentmods.dev/badge/instructions/beel-collab/presets.dev/express.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 | $0.00595 | $0.00595 |
| Opus 5.5 | $0.00238 | $0.00238 |
| Sonnet 5.5 | $0.00119 | $0.00119 |
| Haiku 4.5 | $0.00060 | $0.00060 |
Grade A, and why
presets.dev express.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 today.
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 — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Express Copilot Instructions: Middleware, Routing and Validation
Path-specific Copilot instructions for Express. They apply through applyTo and leave .github/copilot-instructions.md in place.
Updated for Express 5.3.0, Nov 2026
Do not upgrade dependencies or the framework version unless the task asks.
Project shape
Middleware is an ordered list. Security headers, body parsing, and auth run before the route that needs them. A router mounts on a path. Do not register a catch-all before a more specific route and then wonder why the specific route never runs.
An async handler either uses the project's wrapper or relies on Express 5's rejection forwarding. It does not do both. Do not catch a rejection, send a response, and also call next(err).
Validation and bodies
Validate params, query, and body with the project's schema. Reject unknown fields on a write. Cap the JSON body size in the parser. A route that reads req.body with no schema is a review.
Auth and errors
A route that changes data has auth middleware. Do not check auth only in the UI. After auth, check that the resource belongs to the caller. A client-supplied user id is not identity.
The error middleware has four arguments and sits last. It logs the error and sends a status and a short body. It does not send a stack in production. Headers are not written twice.
Security and tests
helmet or the project's header middleware stays enabled. CORS lists origins. Do not reflect any Origin with credentials. Rate-limit the login route the project already protects.
A test hits the route with supertest or the project's client. Cover no token, a bad body, and a body larger than the limit if you changed the limit. Run the test script. Record the output.
Mistakes to avoid
- An Express 4 wildcard left in an Express 5 router.
next(err)after the response was already sent.- A write route with no auth and no schema.
- An unbounded
express.json()body. - A second error handler that runs after the first already sent the body.
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.
- today First seen · 59 lines · 595 tokens per session scan A 872d82357e28
presets.dev express.instructions.md is an instructions file published in the GitHub repository beel-collab/presets.dev (3 stars, last pushed yesterday), licensed MIT. It adds 595 tokens to every session, about $0.0024 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 2026-11-13.
presets.dev express.instructions.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| presets.dev express.instructions.mdbeel-collab/presets.dev | Instructions file | 3 | yesterday | MIT | A | 595 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,685 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,086 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 280k | 2d ago | MIT | A | 4,325 | Codex, OpenCode |