Vox language feature maturity matrix (2026)

Legend: ✅ shipped / wired · 🟡 partial · ⬜ not started / stub · ? needs verification in tree.

Matrix is aspirationally complete; tighten cells with crate owners over time. Sources: durability-runtime-audit-2026.md, gui-native-roadmap-status-2026.md, mesh language spine plans.

Feature	Parse	HIR	Typecheck	Codegen	Runtime	LSP	Formatter	Golden / integration tests	Corpus / MENS lane
`fn` / components / routes	✅	✅	✅	✅	✅	🟡	🟡	✅	🟡
`actor` / `workflow` / `activity` keywords	✅	✅	🟡	🟡	🟡	🟡	🟡	🟡	🟡
`@durable` / `@scheduled`	✅	🟡	🟡	⬜	⬜	🟡	?	🟡	?
`@endpoint` HTTP stack	✅	🟡	🟡	🟡	🟡	🟡	🟡	🟡	?
Effects (`@uses`, Phase 5)	🟡	🟡	🟡	🟡	⬜	?	?	?	?
Mesh: `@remote`, `DurablePromise`	🟡	🟡	🟡	🟡	🟡	?	?	?	?
MENS decorators (`@inference`, etc.)	🟡	🟡	🟡	🟡	🟡	?	?	🟡	🟡
CLI `--for-llm` diagnostic envelope	✅	✅	✅	⬜	⬜	⬜	⬜	✅	⬜
Compiler ↔ LSP diagnostic snapshots	✅	✅	✅	⬜	⬜	✅	⬜	✅	⬜
Formatter AST round-trip (goldens)	🟡	🟡	🟡	⬜	⬜	⬜	🟡	🟡	⬜

How to update

Pick a feature row; cite file:line or test name in a PR note.
If runtime is ⬜ but parse is ✅, add a warning to user-facing docs — See durability audit pattern.
Link new mesh/language tasks back to mesh-phase1-language-spine-plan-2026.md.
Follow test-first policy when promoting a cell from ⬜ → ✅.