Codebase.blog Auto-Posting (MCP + MCPorter)

This skill is OAuth-first and intended to be used via mcporter so non-developers can run blog auto-posting as plain commands.

What This Skill Does

• Authenticate once via OAuth (browser)
• Call MCP tools like normal commands
• Publish posts with create_post
• Optional image upload via presigned URL (get_image_upload_url -> curl PUT -> finalize_uploaded_image)

Trigger Phrases

• 자동포스팅
• 자동포스팅해
• 포스팅해줘
• 블로그 포스팅해줘
• 글 발행해줘
• create post
• publish post

Routing Contract (Skill vs MCP Direct)

Use explicit user intent to choose one execution path. Do not mix both in one run.

Route Selection

• skill route (via mcporter): if user says codebase-skill, skill 사용, skill로, 스킬로, or uses style flags like --podcast, --research, --pm.
• mcp route (direct MCP tools): if user says mcp로, MCP tool, codebase-blog-mcp, 툴로 직접.
• ambiguous phrase only (for example: 자동포스팅해): default to skill route.
• user can always override by adding one explicit token: skill로 or mcp로.

Route Guard

Before create_post, always run check_auth and validate the expected auth mode:

• skill route expected output: 인증 방식 : OAuth 2.1
• mcp route expected output: 인증 방식 : API Key

If mismatch:

1. retry once on the correct route
2. if still mismatched, stop and report route mismatch (do not post)

Preflight Log Line (required)

Print one route line before tool execution:

• skill route: [Route] mode=skill transport=mcporter endpoint=/mcp-remote alias=codebase-blog-oauth
• mcp route: [Route] mode=mcp transport=direct endpoint=/mcp server=codebase-blog-mcp

Setup (Once)

# PROD (DEFAULT for this skill)
# - User-facing default. Most users should configure this alias only.
npx -y mcporter config add codebase-blog-oauth \
  --url https://mcp.codebase.blog/mcp-remote \
  --auth oauth \
  --oauth-redirect-url http://127.0.0.1:33333/callback \
  --scope home

# DEV (local testing only)
# - Use this only if you are running the local MCP proxy on port 3002.
npx -y mcporter config add codebase-blog-oauth-dev \
  --url http://localhost:3002/mcp-remote \
  --auth oauth \
  --allow-http \
  --oauth-redirect-url http://127.0.0.1:33334/callback \
  --scope project

# Browser OAuth (first time only)
npx -y mcporter auth codebase-blog-oauth

Writing Styles (Plain Language)

Writing style means the overall tone and structure the AI will follow when drafting the post.

• default: 가장 무난한 기본형 기술 글
• novel: 이야기처럼 읽히는 서사형 글
• podcast: 대화하듯 쉽게 풀어쓰는 글
• vibe: 개발 성장과 학습 조언 중심 글
• research: 근거, 실험, 한계를 엄격히 다루는 글
• pm: 제품 의사결정과 전략 설명에 맞는 글
• designer: UX 맥락과 디자인 판단을 설명하는 글
• marketer: 성장, 실험, 전환 중심 글

Actual preset files are included in this package:

• writing-styles/_common.md
• writing-styles/default.md
• writing-styles/novel.md
• writing-styles/podcast.md
• writing-styles/vibe.md
• writing-styles/research.md
• writing-styles/pm.md
• writing-styles/designer.md
• writing-styles/marketer.md

If the user does not know which one to choose, start with default.

Custom Writing Styles

Users can also create their own style markdown file and use that as the source of truth.

Recommended starting point:

• writing-styles/custom-template.md

Recommended flow:

1. User copies custom-template.md
2. User edits the file with their own tone, structure, forbidden phrases, and examples
3. The agent reads that file
4. The agent calls get_writing_style_guide(customMarkdown: "...", styleAlias: "custom-name")
5. The agent writes the post from that returned guide
6. The agent calls create_post(..., writingStyle: "custom:custom-name")

If a custom style file exists, prefer it over built-in presets.

Verify (Always First)

Important: treat check_auth as the real success gate. Do not rely on the browser page text alone.

npx -y mcporter call codebase-blog-oauth.check_auth

Safe Gate (Recommended)

mcporter may print errors without a non-zero exit code. Gate on the presence of "error" in the output before posting.

AUTH_OUT=$(npx -y mcporter call codebase-blog-oauth.check_auth --output json 2>&1 || true)
echo "$AUTH_OUT"

if echo "$AUTH_OUT" | grep -q '"error"'; then
  echo "[STOP] OAuth verification failed. create_post not executed."
  exit 1
fi

Publish

npx -y mcporter call 'codebase-blog-oauth.create_post(
  title: "자동포스팅 테스트",
  content_markdown: "## Hello\\n\\nmcporter로 발행한 글입니다.",
  category: "Tech",
  tags: ["mcp","mcporter","automation"]
)'

Writing Style Guide (Optional)

npx -y mcporter call 'codebase-blog-oauth.get_writing_style_guide(style: "default")'

Image Upload (Optional)

# 1) ask for presigned URL
npx -y mcporter call 'codebase-blog-oauth.get_image_upload_url(mimeType: "image/webp", fileSize: 245760)'

# 2) upload with curl PUT (use uploadUrl from step 1)
curl -X PUT -H "Content-Type: image/webp" -T ./cover.webp "UPLOAD_URL_FROM_PREVIOUS_STEP"

# 3) finalize upload
npx -y mcporter call 'codebase-blog-oauth.finalize_uploaded_image(fileKey: "uploads/...", mimeType: "image/webp", fileSize: 245760)'

Troubleshooting

• If the login UI does not appear: you may already be logged in. Try a private window or npx -y mcporter auth codebase-blog-oauth --reset.
• If you see SSE error: Invalid content type, expected "text/event-stream" during mcporter auth: tokens may still be saved. Run check_auth to confirm.
• If port 33333 is in use: pick another fixed callback port and re-add the production alias.
• If you want to test locally, authenticate the dev alias separately: npx -y mcporter auth codebase-blog-oauth-dev.