Harness Support Matrix

Public honesty matrix for repo-managed harness surfaces. The table reflects config/harness-surface-registry.json support tiers; validated rows have fixture-executable evidence and documented rollback coverage (where applicable) recorded in planning/manifests/harness-fixture-support.json.

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-executable	uv run wagents validate uv run pytest tests/test_harness_plan_fixtures.py -q -k 'copilot or merge_copilot'
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-executable	uv run wagents validate uv run wagents openspec validate uv run pytest tests/test_harness_plan_fixtures.py -q -k 'gemini or render_gemini'
Antigravity	repo-present-validation-required	docs-ledger-required	uv run wagents validate
Cursor Editor	validated	fixture-executable	uv run pytest tests/test_sync_agent_stack.py -q -k cursor uv run pytest tests/test_harness_plan_fixtures.py -q -k cursor uv run pytest tests/test_harness_rollback_fixtures.py -q -k cursor_rollback
Cursor CLI	validated	fixture-executable	uv run pytest tests/test_sync_agent_stack.py -q -k cursor uv run pytest tests/test_harness_plan_fixtures.py -q -k cursor uv run pytest tests/test_harness_rollback_fixtures.py -q -k cursor_rollback
Cursor Cloud Agent	repo-present-validation-required	fixture-executable	uv run pytest tests/test_harness_plan_fixtures.py -q -k cursor_cloud uv run wagents validate
Cursor Cloud Subagent	repo-present-validation-required	fixture-executable	uv run pytest tests/test_sync_agent_stack.py -q -k cursor_agent uv run pytest tests/test_harness_plan_fixtures.py -q -k cursor_cloud_subagent uv run pytest tests/test_validate_repo.py -q -k cursor_agents
Cursor Bugbot	repo-present-validation-required	fixture-executable	uv run pytest tests/test_harness_plan_fixtures.py -q -k cursor_bugbot uv run wagents validate
Cursor Agent Client Protocol	repo-present-validation-required	fixture-executable	uv run pytest tests/test_harness_plan_fixtures.py -q -k cursor_acp uv run pytest tests/test_sync_agent_stack.py -q -k 'cursor_adapter_sync_home or cursor_adapter_render' 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-executable	uv run pytest tests/test_grok_platform.py -q uv run pytest tests/test_sync_agent_stack.py -q -k grok uv run pytest tests/test_harness_rollback_fixtures.py -q -k grok

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.
• github-copilot-cli — Requires CLI config, MCP, and installed-skill inventory fixtures before validated support claims.
• opencode — Executable adapter + validate fixtures present; promote to validated after CI matrix green.
• gemini-cli — Requires Gemini CLI instruction, skills, MCP, and OpenSpec wrapper fixtures before validated support claims.
• cursor-editor — Repo-owned editor surfaces via wagents/platforms/cursor.py (rules, skills, MCP, hooks, permissions, agents).
• cursor-cli — Project .cursor/cli.json permissions, MCP, and agent overlays are repo-synced.
• cursor-cloud-agent — Repo-owned project rules and hooks are synced for cloud execution.
• cursor-cloud-subagent — Repo-owned .cursor/agents overlays are synced with portable agents.
• cursor-bugbot — Repo-owned .cursor/BUGBOT.md render fixture present.
• cursor-acp — Repo-owned project MCP and CLI permissions for agent acp.
• grok-build — Fixture-executable via test_grok_platform.py, sync_agent_stack grok slices, and grok rollback merge tests.