# Releases > Hosted MCP and public open-source releases are separate delivery channels. Version labels alone do not identify the same contents. ## Arch Studio 1.5.1.2 Available on: MCP and Open source A content-only patch that presents Arch Studio as Studio, Knowledge, Tooling and Memory. The first pillar is now Studio, covering account and access, configuration, standards and assurance, with no runtime or compatibility change. Published 2026-09-30. Skills: 61 · Agent roles: 8 · Practice areas: 9 · External references: 86. - [Release notes (MCP)](https://architecturestudio.ai/releases/hosted-1-5-1-2-0692a162) - [Release notes (Open source)](https://architecturestudio.ai/releases/public-1-5-1-2) ## Earlier releases Arch Studio 1.5.1 — 2026-09-24. Central studio policy, clearer skill governance, source-faithful specification roles and studio-name branding, available on MCP and as the open-source plugin. Arch Studio 1.5.0 — 2026-09-20. The open-source Arch Studio 1.5.0 for local installation in Codex and Claude Code, with the same content as the hosted Arch Studio 1.5. Every skill is a complete specification that your assistant performs with its own tools; no bundled script runs and nothing needs installing beyond the plugin. It adds fifteen skills, original-source navigation and CSV project registers. Arch Studio 1.4.5 — 2026-09-03. The current open-source Arch Studio release for local installation in Codex and Claude Code. It fixes Claude Desktop installation by moving teaching examples and the Skill Maker template out of the installable skills folder. Arch Studio 1.4.4 — 2026-08-25. A hotfix for Claude Code hook compatibility: hooks no longer block ordinary work when a JSON decoder is missing or a payload is malformed. Arch Studio 1.4.3 — 2026-08-13. A maintenance patch that makes the skill context audit read skill descriptions correctly. Arch Studio 1.4.2 — 2026-08-12. Codex becomes a supported host, alongside Claude Code, without changing the as plugin identity or the studio and project record formats. Arch Studio 1.4.1 — 2026-07-29. A Windows compatibility fix for the repository lint scripts. Arch Studio 1.4.0 — 2026-07-26. Arch Studio becomes an extensible, local-first studio framework: user-owned studio and project workspaces, firm and project skills, linked project records and portable CSV data, installed under the shorter as plugin identity. Arch Studio 1.3.0 — 2026-07-20. Ten plugins become one: Arch Studio installs as a single flat plugin, architecture-studio, with all 40 skills, 7 agents and 2 hooks, plus a guided /learn course and a round of correctness fixes. Arch Studio 1.2.1 — 2026-06-10. A README update summarizing what's new in 1.2. Arch Studio 1.2.0 — 2026-06-10. Persistent project memory arrives with the project dossier plugin and decision records, agents register as native Claude Code subagents and hooks register automatically. Arch Studio 1.1.3 — 2026-06-10. A README refresh. Arch Studio 1.1.2 — 2026-06-10. The materials research plugin becomes standalone, NYC zoning terminology is clarified and the conventions guide becomes self-contained. Arch Studio 1.1.1 — 2026-05-08. A conventions update: every shipped change now moves the version number, a git tag and a GitHub release together. Arch Studio 1.1.0 — 2026-05-08. Conventions and quality checks: a PATTERNS.md reference for plugin conventions, a repository lint script with continuous integration, a marker-driven disclaimer check and skill counts that match the actual files. Arch Studio 1.0.0 — 2026-05-06. The first public release of Arch Studio: a Claude Code plugin system that turns Claude into an architecture, design and AEC assistant, with specialist agents, skills across nine plugins, shared rules and hooks. - [Arch Studio 1.5.1 release notes](https://architecturestudio.ai/releases/public-1-5-1) - [Arch Studio 1.5.1 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.5.1) - [Arch Studio 1.5.0 release notes](https://architecturestudio.ai/releases/public-1-5-0) - [Arch Studio 1.5.0 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.5.0) - [Arch Studio 1.4.5 release notes](https://architecturestudio.ai/releases/public-1-4-5) - [Arch Studio 1.4.5 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.4.5) - [Arch Studio 1.4.4 release notes](https://architecturestudio.ai/releases/public-1-4-4) - [Arch Studio 1.4.4 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.4.4) - [Arch Studio 1.4.3 release notes](https://architecturestudio.ai/releases/public-1-4-3) - [Arch Studio 1.4.3 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.4.3) - [Arch Studio 1.4.2 release notes](https://architecturestudio.ai/releases/public-1-4-2) - [Arch Studio 1.4.2 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.4.2) - [Arch Studio 1.4.1 release notes](https://architecturestudio.ai/releases/public-1-4-1) - [Arch Studio 1.4.1 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.4.1) - [Arch Studio 1.4.0 release notes](https://architecturestudio.ai/releases/public-1-4-0) - [Arch Studio 1.4.0 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.4.0) - [Arch Studio 1.3.0 release notes](https://architecturestudio.ai/releases/public-1-3-0) - [Arch Studio 1.3.0 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.3.0) - [Arch Studio 1.2.1 release notes](https://architecturestudio.ai/releases/public-1-2-1) - [Arch Studio 1.2.1 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.2.1) - [Arch Studio 1.2.0 release notes](https://architecturestudio.ai/releases/public-1-2-0) - [Arch Studio 1.2.0 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.2.0) - [Arch Studio 1.1.3 release notes](https://architecturestudio.ai/releases/public-1-1-3) - [Arch Studio 1.1.3 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.1.3) - [Arch Studio 1.1.2 release notes](https://architecturestudio.ai/releases/public-1-1-2) - [Arch Studio 1.1.2 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.1.2) - [Arch Studio 1.1.1 release notes](https://architecturestudio.ai/releases/public-1-1-1) - [Arch Studio 1.1.1 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.1.1) - [Arch Studio 1.1.0 release notes](https://architecturestudio.ai/releases/public-1-1-0) - [Arch Studio 1.1.0 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.1.0) - [Arch Studio 1.0.0 release notes](https://architecturestudio.ai/releases/public-1-0-0) - [Arch Studio 1.0.0 on GitHub](https://github.com/AlpacaLabsLLC/skills-for-architects/releases/tag/v1.0.0) ## About these releases Each version lists where it is available. A version number means the same capabilities on every channel; a channel that has not shipped a version yet stays on its previous release. Hosted workflows run with your assistant’s capabilities and approvals. Publishing hosted release notes does not publish private source. The public repository remains a separately versioned, account-free local installation. - [Connect the hosted MCP](https://architecturestudio.ai/docs/install) - [Public OSS source](https://github.com/AlpacaLabsLLC/skills-for-architects)