Custom Claude Code Skills and Hooks: Building Your Own Workflows

Using Claude Code as just a chat box unlocks only 30% of its power. Truly efficient people customize it into a dedicated tool that fits their own/team's workflow. Two extension mechanisms are key: Skills (encapsulating reusable "capabilities + workflows") and Hooks (event-driven automation). This article explains how to use both.

1. Skills: Packaging Domain Knowledge and Workflows

A Skill is essentially a directory with documentation. You write "all the context needed to do a certain thing" (steps, specs, templates, references) into a directory, and Claude Code automatically loads it when it determines the current task matches — like installing a "specialized skill pack" for the Agent.

Why do you need it? Because a generic prompt can't hold all the domain details. Rather than manually pasting a bunch of specs every time, it's better to distill them into a Skill that triggers on demand.

The minimal structure of a Skill:

.claude/skills/
  publish-article/
    SKILL.md          # Entry point: description + trigger conditions + execution steps
    templates/
      article.md
    checklist.md      # Pre-publish required checks

SKILL.md is the core. Roughly:

---
name: publish-article
description: Publish a new article following CodeNodeX conventions: validate frontmatter, run SEO checks, import into the database, notify.
Trigger: When the user wants to "publish an article / take an article live / publish"
---

# Execution Steps
1. Read the article markdown; validate frontmatter (slug/title/summary/tags/category all present)
2. Check item by item against checklist.md (SEO title length, canonical, images)
3. Run the import script scripts/import-articles.ts
4. Use curl to verify live 200 + JSON-LD
5. Report results

When you say "publish this article," Claude Code will automatically recognize it and follow this workflow — you solidify a process you figured out once, without having to re-explain it every time.

The value of a Skill lies in reuse + consistency: every person on the team, every project, triggering the same Skill follows the same standard workflow, no longer relying on "remembering how to do it."

2. Hooks: Event-Driven Automation

If a Skill "only works when called," a Hook "automatically triggers when certain things happen." They're Claude Code's lifecycle hooks. Common trigger points:

• PreToolUse: Before a tool call (can intercept/modify parameters).
• PostToolUse: After a tool call (can validate results, trigger follow-ups).
• UserPromptSubmit: When the user submits input.
• Stop: When a turn ends.

Typical config (.claude/settings.json):

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          { "type": "command", "command": "pnpm exec prettier --write \"$CLAUDE_FILE_PATH\"" }
        ]
      }
    ],
    "UserPromptSubmit": [
      { "hooks": [{ "type": "command", "command": "echo 'Remember to follow AGENTS.md' >> /dev/stderr" }] }
    ]
  }
}

The meaning of this config: automatically run prettier formatting after every Edit/Write. From now on you never have to format manually — the matter of team code style goes from "a verbal agreement" to "machine-enforced."

3. In Practice: Baking "Pre-Publish SEO Check" In

Combine the two mechanisms to solve a real problem. Goal: every time you publish an article, automatically check SEO to avoid missing canonical / missing description / overly long titles.

Step 1: Write a check script scripts/seo-check.sh:

#!/usr/bin/env bash
# Check an article's SEO configuration
file=$1
grep -q "^canonical:" "$file" || echo "❌ Missing canonical"
grep -q "^description:" "$file" || echo "❌ Missing description"
title=$(grep "^title:" "$file" | cut -d: -f2-)
[ ${#title} -gt 60 ] && echo "⚠️ Title exceeds 60 characters: $title"
echo "✅ SEO check complete"

Step 2: Use a Hook so that "finishing an article" automatically triggers the check:

{
  "hooks": {
    "PostToolUse": [{
      "matcher": "Write",
      "hooks": [{ "type": "command", "command": "bash scripts/seo-check.sh \"$CLAUDE_FILE_PATH\"" }]
    }]
  }
}

Step 3: Write a publish Skill that strings together "check → import → verify live → report." From then on, a single word "publish" runs the entire workflow automatically and consistently.

4. The Sweet Spots for Skills vs Hooks

Rule of thumb: Use Hooks for things you "want done every time, can't be missed"; use Skills for "on-demand multi-step workflows." The two often work together — a Skill defines the workflow, and a Hook ensures a certain step in it isn't skipped.

5. A Few Adoption Tips

1. Write Skills like an SOP for a newcomer. Clear steps, clear acceptance criteria, with a checklist. A vague Skill is as good as none.
2. A Skill must be triggerable. Write "when to use it" clearly in the description so the model loads it at the right time.
3. Hooks should be lightweight. They run on every event; if too heavy, they slow down the interaction. Put time-consuming operations in the background or async.
4. Hook commands must be idempotent and safe. They may trigger at unpredictable times; don't write dangerous operations with side effects.
5. Distill team experience. A process that a team repeatedly passes on by word of mouth should be distilled into a Skill/Hook, so that "newcomers + AI" can both execute it to standard.

Summary

Claude Code's extensibility is the key to it going from a "general-purpose assistant" to a "dedicated tool." Skills distill workflows and knowledge into reusable capabilities; Hooks solidify standards into enforced automation.

As you progressively distill "how our team does a certain thing" into Skills and Hooks, Claude Code increasingly resembles a senior engineer who knows your team's rules — rather than an intern you have to brief from scratch every time. This "compounding accumulation" is the long-term dividend of using AI coding tools.