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Outline Driven Development
skillASTベースの開発パラダイム。コンテキストエンジニアリングによる構造化開発アプローチ。
Outline-Driven Development
Vibes are too shallow. Specs are too complex. Let there be the outline.
Beyond specs. Beyond vibes. A versioned outline becomes the contract for every agentic act.
Contents
What is Outline-Driven Development?
Outline-Driven Development is a coding methodology for LLM code agents. It occupies the space between two failure modes: vibes (too shallow, non-reproducible) and specs (too rigid, too expensive to maintain). The unit of truth is a versioned outline whose hash anchors every diff, every test, and every diagram.
See PHILOSOPHY.md for the full design rationale and traceability model.
Install
| Host | Repo | Quick install |
|---|---|---|
| Claude Code | odin-claude-plugin | wget -O ~/.claude/CLAUDE.md https://raw.githubusercontent.com/OutlineDriven/odin-claude-plugin/refs/heads/main/CLAUDE.md && claude plugin marketplace add OutlineDriven/odin-claude-plugin && claude plugin install odin@odin-marketplace |
| Codex CLI | odin-codex-plugin | git clone https://github.com/OutlineDriven/odin-codex-plugin.git && rsync -a ./odin-codex-plugin/ ~/.codex/ |
| Gemini CLI | odin-gemini-cli-extension | gemini extensions install https://github.com/OutlineDriven/odin-gemini-cli-extension |
| Any IDE / agent (prompt-only) | — | GENERIC_PROMPT.md |
| Compact prompt | — | COMPACT_PROMPT.md |
See INSTALL.md for CLI tool prerequisites and detailed setup.
Comparison
| Aspect | Vibe coding | Spec-driven (Spec Kit) | BMad | Outline-Driven Development |
|---|---|---|---|---|
| Source of truth | LLM intuition | Spec doc | Behavioral specs | Versioned outline (hash-anchored) |
| Iteration unit | "Try again" | Spec -> re-prompt | BDD scenarios | Outline node x diff |
| Validation | Eyeball | Spec compliance | Acceptance tests | Diagram-first invariants + AST |
| Tooling | Plain chat | GitHub Spec Kit | BMad CLI | Plugins for Claude / Codex / Gemini |
| Reuse unit | Conversation | Spec template | Story | Skill / agent / outline |
| LLM creativity | Unbounded | Bounded by spec | Bounded by story | Bounded by outline; preserved within envelope |
| Best for | Throwaway scripts | Greenfield features | User-facing flows | Long-lived methodologies + agentic work |
Recent Updates
2026-04
- Execution default flipped: Review-Gated Sequencing is the default for dependent tasks; Parallel only when independence is provable. Reviewer subagent inserted between every worker phase.
- Testing charter narrowed: A test exists only if deleting it would let a real bug reach prod. Skip config-shape/constructor-output tests only when a static guarantee covers them (Rust, TS-strict, Kotlin, Java, C++); keep boundary shape/type tests in dynamic languages (Python, JS, Ruby).
- Token-Efficient Output [MANDATORY]: ANSI/decoration suppression, discovery-then-targeted-read pattern, per-tool flag table.
- Completion Gate [MANDATORY]: Run repo-native verification before declaring task complete.
- DOD anchor: Data layout first (SoA vs AoS, alignment, padding), hot/cold split, batch homogeneity, zero-copy boundaries.
- OCaml 5.2+ language profile added.
- Commit hygiene tightened: one concern per commit, never bundle unrelated changes.
- Post-Agent Verify: read back modified files after subagent edits; line-count mismatch = critical failure.
Contributing
Open an issue to discuss ideas or report bugs. PRs improving the methodology, prompts, or tooling documentation are welcome.
License
MIT — see LICENSE.