GSD Core ("Git.
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Ship. Done.") is a light-weight meta-prompting, context-engineering and spec-driven development system for AI coding agents. It runs each milestone through a Discuss, Plan, Execute, Verify, Ship loop and pushes heavy research, planning and execution into fresh-context subagents to avoid context rot in the main session.
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Five-step phase loop: Discuss, Plan, Execute, Verify, Ship
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Heavy work runs in fresh-context subagents, executed in parallel waves
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`STATE.md` and `CONTEXT.md` artifacts that survive session boundaries
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Verify step walks through what was built and writes fix plans before a phase is done
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One installer (`npx @opengsd/gsd-core@latest`) for Claude Code, OpenCode, Antigravity CLI, Kimi CLI, Kilo, Codex, Copilot, Cursor, Windsurf and more
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`/gsd-new-project` for greenfield work and `/gsd-onboard` for existing codebases
Open Source
Free and open-source under the MIT License; it runs inside the coding agent you already use, so your only costs are that agent's subscription or API usage.
Best for
Developers running multi-phase features with a coding agent who want structured planning, verification and clean context without adopting a new IDE.
Not ideal for
Quick one-off edits, or users who want minimal token use, since the subagent-heavy workflow trades extra tokens for quality.
A popular, actively shipped spec-driven workflow layer that works across most coding agents; worth trying if context rot is hurting long agent sessions.
v1.20.1 was released on Nov 5, 2026, two days after v1.20.0, fixing fork-probe cache handling and installer path rewriting for nested config directories across runtimes.
As of
Is GSD Core free?+
Yes - GSD Core is Open Source. Free and open-source under the MIT License; it runs inside the coding agent you already use, so your only costs are that agent's subscription or API usage.
Is GSD Core open source?+
Yes - GSD Core is open source. Free and open-source under the MIT License; it runs inside the coding agent you already use, so your only costs are that agent's subscription or API usage.
Who is GSD Core best for?+
Developers running multi-phase features with a coding agent who want structured planning, verification and clean context without adopting a new IDE.
Who is GSD Core not ideal for?+
Quick one-off edits, or users who want minimal token use, since the subagent-heavy workflow trades extra tokens for quality.
What are the best GSD Core alternatives?+
The closest GSD Core alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes GSD Core?+
GSD Core is developed by Open GSD. It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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