Agent Continuity Stack 3.0.0-rc.4

Agent Continuity Stack 3.0.0-rc.4

This is the first public release candidate of Agent Continuity Stack, a
provider-neutral operating contract, skills pack, project-memory standard, and
lifecycle protocol for AI coding agents.

This prerelease is suitable for review and controlled testing. It is not a
claim of complete runtime verification across every advertised client.

Release identity

• Tag: v3.0.0-rc.4
• Commit: 0e24499b9455f1956d0e8390bbd49cf62f908e52
• Publication date: 2026-07-26
• Archive: agent-continuity-stack-3.0.0-rc.4.zip
• Archive SHA-256:
  e159a83df32dacceb29ca93c118b2cf14b293e790ecd1b636fb33f166f059893

The separate .sha256 asset verifies byte integrity. A checksum alone does not
establish publisher authenticity.

Included

• Complete Expert Agent Operating Contract
• Mandatory project-continuity foundations through AGENTS.md, README.md,
  and MEMORY.md
• 14 core Skills
• 1 optional Astro + Cloudflare Skill
• Codex, Cursor, Claude Code, and Antigravity client definitions
• Schema-backed, model-operated installation and rollback protocol
• Portable Web Toolkit integration
• Source, archive, privacy, conformance, and CI validation
• Release inventory and external SHA-256 checksum

Verified in this release candidate

• Repository and package validation
• Contract integrity and source hashing
• Archive traversal and tree-safety checks
• Skill manifest and metadata validation
• Core and optional Skill validation
• Archive inventory, checksum, clean extraction, and extracted-suite rerun
• GitHub CI on Python 3.10 and 3.14
• Codex project-level runtime evidence for the recorded version

Remaining final-release gates

The following remain unverified and block promotion to stable 3.0.0:

• Claude Code runtime loading
• Cursor authenticated Skill discovery
• Full Antigravity two-fragment loading in a fresh session
• Focused immutable-backup recovery rerun
• Windows reparse-point and metadata behavior
• Complete four-client public installation exercise
• Final review of always-on contract cost and instruction-priority wording

These items are not represented as complete by this prerelease.

See the included compatibility matrix, installation protocol, handoff, and
release checklist for current evidence and known limitations.