Harness Support Matrix

Public honesty matrix for repo-managed harness surfaces. No harness is labeled validated until fixture-backed CI is green.

Stranger defaults

Use MCPHub only when you explicitly opt in. Repo docs and public catalog default to repository + external catalog skills (wagents docs generate --no-installed).

Harness	Support tier	Fixture status	Validation commands
Claude Code	repo-present-validation-required	fixture-executable	uv run wagents validate uv run wagents package --dry-run uv run pytest tests/test_platform_adapters.py -q
Claude Desktop	repo-present-validation-required	fixture-plan-only	uv run wagents validate
ChatGPT	repo-present-validation-required	docs-ledger-required	uv run wagents validate
Codex	repo-present-validation-required	fixture-executable	uv run pytest tests/test_distribution_metadata.py uv run wagents validate uv run pytest tests/test_platform_adapters.py -q
GitHub Copilot Web and Coding Agent	repo-present-validation-required	fixture-plan-only	uv run wagents validate
GitHub Copilot CLI	repo-present-validation-required	fixture-plan-only	uv run wagents validate
OpenCode	repo-present-validation-required	fixture-executable	uv run pytest tests/test_distribution_metadata.py uv run wagents validate uv run pytest tests/test_platform_adapters.py -q
Gemini CLI	repo-present-validation-required	fixture-plan-only	uv run wagents validate uv run wagents openspec validate
Antigravity	repo-present-validation-required	docs-ledger-required	uv run wagents validate
Cursor Editor	repo-present-validation-required	fixture-plan-only	uv run wagents validate
Cursor Agent Web	planned-research-backed	docs-ledger-required	uv run wagents validate
Cursor Agent CLI	planned-research-backed	docs-ledger-required	uv run wagents validate
Perplexity Desktop	experimental	docs-ledger-required	uv run wagents validate
Cherry Studio	experimental	fixture-plan-only	uv run wagents validate
Crush	repo-present-validation-required	fixture-plan-only	uv run wagents validate
Grok Build	repo-present-validation-required	fixture-plan-only	uv run pytest tests/test_sync_agent_stack.py uv run wagents validate

Executable fixtures today

These harnesses have fixture-executable status in planning/manifests/harness-fixture-support.json:

• claude-code — Executable adapter + validate fixtures present; promote to validated after CI matrix green.
• codex — Executable adapter + validate fixtures present; promote to validated after CI matrix green.
• opencode — Executable adapter + validate fixtures present; promote to validated after CI matrix green.