Fission-AI/OpenSpec

Health v2 · maintenance only

Adoption not part of the score

66353 stars · 4568 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

OpenSpec is a lightweight spec-driven development (SDD) framework that lets AI coding assistants like Claude Code, Cursor, and Copilot work from versioned specification files stored in the repository. It provides slash-command workflows (/opsx:explore, propose, apply, archive) that generate proposals, spec deltas, design docs, and task checklists before code is written.

Use cases

• manage specs for ai coding assistants
• generate spec deltas before implementing changes
• keep ai agent context persistent across chat sessions
• plan features with proposals and task checklists
• review intent and requirements instead of just code diffs
• onboard developers with a browsable spec library
• add spec-driven development to an existing brownfield codebase

When to choose

• you use AI coding assistants and want structured, reviewable change planning
• you want requirements and scenarios versioned in git alongside code
• you work on an existing codebase and need iterative, lightweight spec workflows
• you want tool-agnostic specs with no API keys or MCP servers required

When to avoid

• you prefer heavyweight waterfall or formal requirements-management tools
• your team writes code without AI assistance and has no spec discipline needs
• you need strict compliance-grade requirements traceability

Facets

cli-tool · maturity active

developer-tools workflow-automation documentation prompt-engineering cli developer-tools documentation large-language-models cli cross-platform spec-driven-development ai-coding-assistants sdd context-engineering slash-commands brownfield automation ai-agents nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="Fission-AI/OpenSpec")