Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add pledgeandgrow/pledge-skills --skill expressgit clone --depth 1 https://github.com/pledgeandgrow/pledge-skillsWrote 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/skills/pledgeandgrow/pledge-skills/express)<a href="https://agentmods.dev/skills/pledgeandgrow/pledge-skills/express"><img src="https://agentmods.dev/badge/skills/pledgeandgrow/pledge-skills/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/skills/pledgeandgrow/pledge-skills/express"><img src="https://agentmods.dev/badge/skills/pledgeandgrow/pledge-skills/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 | $0.00080 | $0.01072 |
| Opus 5 | $0.00040 | $0.00536 |
| Sonnet 5 | $0.00016 | $0.00214 |
| Haiku 4.5 | $0.00008 | $0.00107 |
Grade A, and why
express-docs 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 9d 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 — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Express Expert (v5.x)
Official Documentation: https://expressjs.com/ GitHub: https://github.com/expressjs/express
What is Express?
Express is a fast, unopinionated, minimalist web framework for Node.js. It provides a robust set of features for web and mobile applications, including routing, middleware, template rendering, and API development.
Quick Reference
| Topic | File |
|---|---|
| Getting Started (install, hello world, generator, static files, FAQ) | getting-started.md |
| Routing (methods, paths, params, handlers, app.route, Router) | routing.md |
| Middleware (writing, using, app-level, router-level, error, built-in, third-party) | middleware.md |
| Error Handling (catching errors, handlers, async patterns) | error-handling.md |
| API: express() & Application Object | api-app.md |
| API: Request Object (req properties & methods) | api-request.md |
| API: Response Object (res properties & methods) | api-response.md |
| API: Router Object (router methods) | api-router.md |
| Template Engines (using, developing, rendering) | template-engines.md |
| Debugging (DEBUG env var, debugging routes, views) | debugging.md |
| Database Integration (MongoDB, MySQL, PostgreSQL, Redis) | database.md |
| Security (best practices, helmet, CORS, rate limiting) | security.md |
| Performance (best practices, caching, clustering) | performance.md |
| Production (healthcheck, graceful shutdown, behind proxies) | production.md |
| Migration (to Express 4, to Express 5, breaking changes) | migration.md |
| Overriding Express API (methods, properties, TypeScript) | overriding-api.md |
| Security Updates (CVEs, vulnerabilities, patches) | security-updates.md |
Hello World
import express from 'express';
const app = express();
const port = 3000;
app.get('/', (req, res) => {
res.send('Hello World!');
});
app.listen(port, () => {
console.log(`Example app listening on port ${port}`);
});
Project Structure
What ships with it
17 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- api-app.md 6.1 KB
- api-request.md 4.9 KB
- api-response.md 5.6 KB
- api-router.md 4.0 KB
- database.md 4.9 KB
- debugging.md 3.2 KB
- error-handling.md 5.4 KB
- getting-started.md 5.0 KB
- middleware.md 5.6 KB
- migration.md 5.0 KB
- overriding-api.md 3.2 KB
- performance.md 5.4 KB
- production.md 5.4 KB
- routing.md 5.8 KB
- security-updates.md 2.7 KB
- security.md 6.3 KB
- template-engines.md 4.4 KB
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.
- 9d ago First seen · 131 lines · 80 tokens per session scan A ba76712b286d
express-docs is a skill published in the GitHub repository pledgeandgrow/pledge-skills (10 stars, last pushed 1mo ago), licensed MIT. It adds 80 tokens to every session and 1,072 once invoked, about $0.0004 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 2026-08-31.
Other skills, from other repositories
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Express.js Testing Patterns
Express.js API testing with supertest, middleware testing, route handler testing, error handling verification, and authentication testing.
backend
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express-microservices-architecture
Complete guide for building scalable microservices with Express.js including middleware patterns, routing strategies, error handling, production architecture, and deployment best practices.
express-production
Production-ready Express.js development covering middleware architecture, error handling, security hardening, testing strategies, and deployment patterns.
Express/Fastify Backend Patterns
Use this skill when building Node.js HTTP APIs with Express or Fastify and you want safe request validation, predictable error handling, and maintainable routing/service layering.