A featherweight spec-driven development template with a Memory Bank, for Claude Code, GitHub Copilot and JetBrains Junie.
Latest release v1.9.0 — FeatherSpec 1.9.0 — Spec fidelity in /sdd-compile · 27 Sept 2026
10 files for Claude Code, GitHub Copilot, Codex and OpenCode: featherspec, featherspec architecture-map.instructions.md, featherspec constitution.instructions.md, featherspec knowledge-records.instructions.md and 6 more — 3,280 tokens loaded in every session.
.github/instructions/architecture-map.instructions.md A 90 tok .github/instructions/constitution.instructions.md A 87 tok .github/instructions/knowledge-records.instructions.md A 99 tok .github/instructions/memory-bank.instructions.md A 91 tok .github/instructions/plans.instructions.md A 89 tok .github/instructions/repo-docs.instructions.md A 95 tok .github/instructions/specs.instructions.md A 87 tok AGENTS.md A 2,637 tok CLAUDE.md A 5 tok .claude/settings.json A — These files are GregorBiswanger/featherspec's own configuration — they tell Claude Code, GitHub Copilot, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.