Blog Post Writer

Overview

Transform technical content into a polished blog post for senior engineers. Accept input as a file or plain text, ask the user to confirm category, then write the post following the category template.

Invocation

Three ways to provide source content:

/blog @path/to/source.md          # markdown file
/blog @path/to/notes.txt          # text file
/blog <paste plain text here>     # plain text directly

$ARGUMENTS may contain a file path or plain text. Determine which:

• If it looks like a file path (contains / or .md or .txt), read the file.
• Otherwise, treat $ARGUMENTS itself as the source content.

Workflow

digraph blog_post {
    "Read source file" [shape=box];
    "Analyze content" [shape=box];
    "Ask category" [shape=box];
    "Gap analysis" [shape=box];
    "Gaps found?" [shape=diamond];
    "Ask user to fill gaps" [shape=box];
    "Sufficient?" [shape=diamond];
    "Write draft" [shape=box];
    "Self-review" [shape=box];
    "All rules pass?" [shape=diamond];
    "Fix violations" [shape=box];
    "Save .md file" [shape=box];

    "Read source file" -> "Analyze content";
    "Analyze content" -> "Ask category";
    "Ask category" -> "Gap analysis";
    "Gap analysis" -> "Gaps found?";
    "Gaps found?" -> "Write draft" [label="no"];
    "Gaps found?" -> "Ask user to fill gaps" [label="yes"];
    "Ask user to fill gaps" -> "Sufficient?";
    "Sufficient?" -> "Ask user to fill gaps" [label="no, ask again"];
    "Sufficient?" -> "Write draft" [label="yes"];
    "Write draft" -> "Self-review";
    "Self-review" -> "All rules pass?" ;
    "All rules pass?" -> "Fix violations" [label="no"];
    "Fix violations" -> "Self-review";
    "All rules pass?" -> "Save .md file" [label="yes"];
}

1. Read the source content from $ARGUMENTS (file path → read file; plain text → use directly)
2. Analyze content: identify language, key topics, available data
3. Ask user to confirm category (case / study / guide) via AskUserQuestion — suggest your best guess as the first option
4. Gap analysis — compare source content against the chosen category template. Identify which sections lack sufficient information to write a useful post.
5. Fill gaps — if gaps exist, ask the user one question at a time via AskUserQuestion until every template section has enough material. Use multiple choice when possible. Do NOT proceed to writing until the content is sufficient.
6. Write draft — write the post following all rules in the Iron Rules section, incorporating both the source file and the user’s answers
7. Self-review — review the draft against the Self-Review Checklist below. Do NOT show the draft to the user yet.
8. Fix & repeat — if any checklist item fails, fix the violation and re-review. Repeat until every item passes.
9. Save the final post to user-specified path, or default: blog/posts/YYYY-MM-DD-<slug>.md

Self-Review Checklist

After writing the draft, check every item below. If any item fails, fix it and re-check the full list.

Content Integrity:

• No fabricated content — every claim traces back to the source or user’s answers
• Code blocks are identical to the source
• Post length is proportional to source length (no padding)

Writing Style (Strunk):

• Active voice throughout — no “was implemented”, “was observed”
• Positive form — no “don’t forget to”, “it is not uncommon”
• Specific and concrete — no “significantly improved”, “much faster”
• No needless words — every sentence earns its place
• Emphatic word at end of each key sentence
• One paragraph, one topic — no paragraph covers two subjects
• Topic sentence leads each paragraph
• Parallel structure in all lists — items share the same grammatical form
• Related words kept together — modifiers next to what they modify
• No loose sentence chains — no run-on compound sentences
• Consistent tense within each section

Banned Patterns:

• Zero AI puffery (groundbreaking, seamless, pivotal, vital, testament)
• Zero overused AI words (delve, leverage, multifaceted, foster, realm, tapestry)
• Zero empty -ing phrases (ensuring reliability, showcasing features)
• No filler intros (“In recent years…”, “As we all know…”)
• No restating conclusion
• No puffery-as-emphasis (non-negotiable, crucial, indispensable)
• No promotional adjectives (robust, powerful, state-of-the-art)
• No formatting overuse (excessive bullets, bold on every line, emoji)

Structure:

• Frontmatter matches the spec exactly (no extra fields)
• Template sections are all present (or intentionally skipped by user)
• Hook is specific and pulls the reader in
• TL;DR is 3 bullets max
• Section lengths vary (not all the same)

Gap Analysis Guide

After choosing the category, map the source content to each template section. Flag sections where:

• No data at all — template section has zero corresponding content in source
• Too vague — source mentions something but lacks specifics (e.g., “performance improved” without numbers)
• Missing context — reader would ask “why?” or “compared to what?” and the source doesn’t answer

Ask the user to fill these gaps. One question at a time. Prefer multiple choice. Example:

“The Results section needs numbers. Do you have benchmark data?”

• Yes (I’ll provide it)
• Not yet measured (skip Results section)
• Only rough estimates

If the user says to skip a section, omit it from the final post rather than writing filler.

Iron Rules

These are non-negotiable. Violating any one of these means the post needs to be rewritten.

Content Integrity

• Never fabricate. Use only what exists in the source. If the source says “benchmark: p50 3ms”, write about that result. Do not invent context, backstory, or details.
• Preserve code blocks exactly. No renaming variables, no adding lines, no removing lines. Format/comment cleanup only.
• Do not over-expand. A 30-line source does not become a 120-line post. Add structure and connective tissue, not padding.

Writing Style

Follow Strunk’s principles:

• Active voice. “We reduced latency” not “Latency was reduced.”
• Omit needless words. Cut every sentence that repeats what was already said.
• Specific over vague. “p99 dropped from 45ms to 8ms” not “performance improved significantly.”
• Positive form. “Use sync.Pool” not “Don’t forget to consider sync.Pool.”
• Place emphasis at end of sentence. The important word goes last.
• One paragraph, one topic. A paragraph that covers both “why we chose Go” and “how batching works” must be split.
• Topic sentence first. Start each paragraph with its main point. Supporting details follow.
• Parallel structure. List items must share the same grammatical form. All nouns, all verbs, or all imperative — pick one and hold it.
• Keep related words together. Place modifiers next to what they modify. “A server written in Go that handles 4200 req/s” not “A server that handles 4200 req/s written in Go.”
• No loose sentence chains. Avoid run-on compound sentences. Break into shorter sentences with varied structure.
• One tense per section. Pick past or present and stick with it within a section. Do not mix.

Banned Patterns

Tone

Write as a senior engineer sharing with peers. Not a blog marketer, not a professor, not a salesperson. Assume the reader is smart and busy.

Frontmatter

Always generate this exact structure:

---
title: "<concise, descriptive title>"
date: YYYY-MM-DD
description: "<one sentence summary — what this post delivers to the reader>"
category: case | study | guide
tags:
  - tag1
  - tag2
  - tag3
draft: true
featured: false
---

• If the source has frontmatter, preserve and fill gaps
• If not, generate from content
• Do not add fields not listed above (no author, no slug, no image)
• Match the language of the source content

Category Templates

case — Experience / Case Study

“We did X, and here’s what happened.” Implementation stories, migrations, incident response, performance improvements.

# [Title]

[Hook — 1-2 sentences. An unexpected result, a hard constraint, or a specific problem that pulls the reader in.]

## TL;DR
- 3 bullets max. Busy reader stops here if not relevant.

## Problem & Constraints
- The specific problem being solved
- Real constraints (latency budget, team size, existing system, etc.)

## Approach & Trade-offs
- What approach was chosen and what alternatives were considered
- Why this one won (concrete trade-off reasoning)

## Implementation
- Key code with brief explanation
- Design decisions that matter

## Results
- Benchmarks, metrics, before/after (use tables when comparing)

## Lessons Learned
- What actually surprised you
- What you would do differently

## Takeaways
- Actionable insights the reader can apply to their own work

study — Learning / Deep Dive

“I dug into X, and here’s the core idea.” Paper reviews, new technology analysis, concept deep dives.

# [Title]

[Hook — What triggered this study, in 1-2 sentences.]

## TL;DR
- 3 bullets max.

## Core Idea
- The central concept, explained clearly

## Deep Dive
- Technical details, code/math/diagrams

## Practical Implications
- Why this matters for working engineers

## Critical Analysis
- Strengths, weaknesses, open questions

## Takeaways
- Key points + recommended resources (if any)

guide — How-to / Tutorial

“Here’s how to do X.” Environment setup, library usage, best practices — content the reader can follow along with.

# [Title]

[Hook — 1-2 sentences. What problem this guide solves and who it's for.]

## TL;DR
- 3 bullets max. What you'll be able to do after reading this.

## Prerequisites
- What the reader needs before starting (tools, versions, knowledge)

## Steps
- Step-by-step with code blocks
- Each step: what to do, why, and expected result
- Group related steps under subheadings if needed

## Troubleshooting
- Common errors and how to fix them
- Edge cases worth knowing

## Takeaways
- Summary of what was covered
- Next steps or further reading

Output Language

Match the source file’s language. Korean source → Korean post. English source → English post. Mixed → follow the dominant language.

Red Flags — Rewrite If You Catch Yourself Doing This

• Adding a “Conclusion” section that restates what was already said
• Writing 3 paragraphs where 3 sentences would do
• Inventing quotes, scenarios, or backstory not in the source
• Starting with “In the rapidly evolving world of…”
• Using more than 2 adjectives in a single sentence
• Every section having the same length (vary rhythm)