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, --tutorial.
• 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)

# DEV (DEFAULT for this skill)
# - Safe default: prevents accidental production posting while testing.
npx -y mcporter config add codebase-blog-oauth \
  --url http://localhost:3002/mcp-remote \
  --auth oauth \
  --allow-http \
  --oauth-redirect-url http://127.0.0.1:33334/callback \
  --scope project

# PROD (explicit opt-in)
npx -y mcporter config add codebase-blog-oauth-prod \
  --url https://mcp.codebase.blog/mcp-remote \
  --auth oauth \
  --oauth-redirect-url http://127.0.0.1:33333/callback \
  --scope home

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

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 server.