I build reliable AI-agent and developer tooling, and contribute tested fixes and features across the open-source ecosystem.
I use coding agents transparently; the work highlighted here is limited to upstream-merged contributions with reproducible validation.
Blog · Portfolio · Merged open-source contributions · YouTube Research MCP on npm
| Project | Focus |
|---|---|
| YouTube Research MCP | Citation-ready YouTube research for AI agents, with exact timestamp links and cross-video evidence |
| ralph-research | Local-first runtime that keeps only verified improvements from recursive research experiments |
| tmuxicate | Durable, vendor-neutral coordination for coding agents in tmux, with explicit task, review, and blocker state |
| Project | Stars | Latest release |
|---|---|---|
| YouTube Research MCP | 15 | YouTube Research MCP v1.2.0 |
| ralph-research | 0 | v0.1.6 |
| tmuxicate | 0 | No tagged release yet |
Last updated 2026-08-17 via GitHub Actions.
Read the Korean case study: how I turn merged pull requests into engineering evidence.
| Project | Contribution |
|---|---|
| Quicktype | Added opt-in final Swift class generation and validated all 241 Swift fixture runs |
| Swift Package Manager | Prevented completion-script generation from creating unnecessary build directories |
| Effect | Fixed Schema-to-Arbitrary handling in record-form property tests and added regression coverage |
| Sentry | Propagated original event IDs into symbolication error scopes for traceable internal failures |
| Tailscale | Corrected plain TCP serve-status annotations while preserving TLS and PROXY protocol labels |
| Super Productivity | Added reactive custom-section task counts with Playwright regression coverage |
40 merged pull requests across 24 public projects.
Latest upstream merges:
- PipedreamHQ/pipedream — Fix Google Search Console page filters (2026-08-07)
- PipedreamHQ/pipedream — fix(jira): clarify Cloud ID discovery for MCP tools (2026-08-07)
- PipedreamHQ/pipedream — Add Zendesk side conversation actions (2026-08-03)
- PipedreamHQ/pipedream — feat(monta): add list product stock changes action (2026-07-28)
- kopia/kopia — refactor(general): use structured logging for faults (2026-07-25)
Last updated 2026-08-17 via GitHub Actions.
- Reproduce the problem before changing code, then add regression coverage.
- Follow each repository's own contribution, formatting, and validation workflow.
- Report environment limitations separately from failures caused by a change.
- Disclose substantive AI assistance and keep the verification evidence reviewable.
I write in Korean about frontend engineering, developer tooling, security, and AI-assisted software development at coyasong.dev.
한국어 소개
신뢰할 수 있는 AI 에이전트 및 개발자 도구를 만들고, 여러 오픈소스 프로젝트에 테스트와 검증 근거를 갖춘 개선을 기여하고 있습니다.