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express-conventions

express-conventions is a skill for Claude Code, Codex from Cypsy1714/cchad. It costs 17 tokens per session (214 once invoked), scanned A, original, MIT.

A set of conventions for building or reviewing Express.js servers, which are Node.js web applications. It covers route structure, input validation, configuration, middleware order, errors, database safety, and API security.

In plain words
What is it for?
Structuring Express routes and services, validating requests, ordering middleware, handling errors, securing APIs, and returning consistent JSON responses.
Why use it?
It provides consistent patterns that reduce unhandled errors, unsafe input handling, confusing responses, and common server-security gaps.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 1repo 4mo ago A scan 17 tokens original MIT

Good fit Structuring Express routes and services, validating requests, ordering middleware, handling errors, securing APIs, and returning consistent JSON responses.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cypsy1714/cchad/express-skill
View source ↗ Cypsy1714/cchad
Install

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.

Any agent
npx skills add Cypsy1714/cchad --skill express-skill
Clone the repo
git clone --depth 1 https://github.com/Cypsy1714/cchad

Made for: Claude Code, Codex.

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 express-conventions

README.md
[![agentmods](https://agentmods.dev/badge/skills/cypsy1714/cchad/express-skill/github.svg)](https://agentmods.dev/skills/cypsy1714/cchad/express-skill)
Your own site
<a href="https://agentmods.dev/skills/cypsy1714/cchad/express-skill"><img src="https://agentmods.dev/badge/skills/cypsy1714/cchad/express-skill/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 express-conventions

Your own site · 80×15
<a href="https://agentmods.dev/skills/cypsy1714/cchad/express-skill"><img src="https://agentmods.dev/badge/skills/cypsy1714/cchad/express-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 214 The whole file, excluding the scripts and references it only reads on demand.
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 $0.00017 $0.00214
Opus 5.5 $0.00007 $0.00086
Sonnet 5.5 $0.00003 $0.00043
Haiku 4.5 $0.00002 $0.00021

Measured 2mo ago against content hash 087a281f9ce1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

express-conventions 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 2mo 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.

src/cchad/data/skills/express-skill/SKILL.md · 25 lines

What it actually says

Express conventions

Structure

  • Split routes into Routers per resource; keep handlers thin and put business logic in a service layer.
  • Validate and parse input at the edge (a schema library) before it reaches logic.
  • Centralize configuration; read env once into a typed config object.

Middleware & errors

  • Order middleware deliberately: parsers → auth → routes → error handler last.
  • Wrap async handlers so rejected promises reach your error middleware (or use a helper / Express 5's built-in async handling) — don't let errors go unhandled.
  • Use a single error-handling middleware that maps errors to status codes; don't leak stack traces to clients.

Practical

  • Never build SQL or shell strings from user input; use parameterized queries.
  • Set security headers (helmet), enable CORS intentionally, and rate-limit public APIs.
  • Return consistent JSON shapes and correct status codes.
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. 2mo ago First seen · 25 lines · 17 tokens per session scan A 087a281f9ce1

Subscribe to this mod's changes

express-conventions is a skill published in the GitHub repository Cypsy1714/cchad (1 stars, last pushed 4mo ago), licensed MIT. It adds 17 tokens to every session and 214 once invoked, about $0.0001 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.

Backend and APIsClaude Codeanthropicclaudeclaude-code-plugindevtoolsmcp
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