Add post scaffolding skill and helper script

.agents/skills/add-post-skill/SKILL.md

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+---
+name: add-post-skill
+description: Create a new Jekyll blog post in _posts/ using the site's filename convention, required front matter, and a starter content shell.
+---
+
+# Add Post Skill
+
+## When to use
+Use this skill when asked to create, initialize, scaffold, or draft a new blog post for this site.
+
+## Goal
+Create a new Markdown file in `_posts/` that matches this repository's Jekyll conventions.
+
+## Inputs
+- title (required)
+- description (optional)
+- date (optional, YYYY-MM-DD)
+- draft flag (optional)
+
+## Implementation
+Use the helper script:
+
+```
+scripts/new-post.sh "<title>" "<description>" "<date>"
+```
+
+## Behavior
+- Slugify title (lowercase, hyphenated)
+- Use provided date or default to current date
+- If draft flag is set, create file in `_drafts/slug.md`
+- Otherwise create `_posts/YYYY-MM-DD-slug.md`
+- Validate slug is non-empty
+- Quote YAML values safely
+- Do not overwrite existing files
+
+## Template
+
+---
+layout: post
+title: "<TITLE>"
+date: <YYYY-MM-DD>
+description: "<OPTIONAL>"
+---
+
+Write your introduction here.
+
+## Key points
+
+- 
+- 
+- 
+
+## Details
+
+## Closing
+
+## Notes
+- Permalinks handled by `_config.yml`
+- Script available: `scripts/new-post.sh`

scripts/new-post.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  echo 'Usage: scripts/new-post.sh [--draft] "Post Title" [description] [date]'
+}
+
+yaml_escape() {
+  local value="${1:-}"
+  value=${value//\\/\\\\}
+  value=${value//\"/\\\"}
+  printf '%s' "$value"
+}
+
+DRAFT=false
+
+if [[ ${1:-} == "--draft" ]]; then
+  DRAFT=true
+  shift
+fi
+
+if [[ $# -lt 1 || $# -gt 3 ]]; then
+  usage
+  exit 1
+fi
+
+TITLE="$1"
+DESCRIPTION="${2:-}"
+DATE="${3:-$(date +%F)}"
+
+if [[ ! "$DATE" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]]; then
+  echo "Invalid date: $DATE (expected YYYY-MM-DD)"
+  exit 1
+fi
+
+SLUG="$(printf '%s' "$TITLE" \
+  | tr '[:upper:]' '[:lower:]' \
+  | sed -E 's/[^a-z0-9]+/-/g; s/^-+//; s/-+$//; s/-+/-/g')"
+
+if [[ -z "$SLUG" ]]; then
+  echo "Unable to generate slug from title: $TITLE"
+  exit 1
+fi
+
+if [[ "$DRAFT" == "true" ]]; then
+  DIR="_drafts"
+  FILE="${DIR}/${SLUG}.md"
+else
+  DIR="_posts"
+  FILE="${DIR}/${DATE}-${SLUG}.md"
+fi
+
+mkdir -p "$DIR"
+
+if [[ -e "$FILE" ]]; then
+  echo "Refusing to overwrite existing file: $FILE"
+  exit 1
+fi
+
+{
+  echo "---"
+  echo "layout: post"
+  printf 'title: "%s"\n' "$(yaml_escape "$TITLE")"
+  printf 'date: %s\n' "$DATE"
+  if [[ -n "$DESCRIPTION" ]]; then
+    printf 'description: "%s"\n' "$(yaml_escape "$DESCRIPTION")"
+  fi
+  echo "---"
+  echo
+  echo "Write your introduction here."
+  echo
+  echo "## Key points"
+  echo
+  echo "- Add your first point"
+  echo "- Add your second point"
+  echo "- Add your third point"
+  echo
+  echo "## Details"
+  echo
+  echo "Add the main body of the post here."
+  echo
+  echo "## Closing"
+  echo
+  echo "Wrap up with the takeaway or next step."
+} > "$FILE"
+
+echo "Created $FILE"