Lumen Protocol v0, revision 25 (frozen snapshot). © Moonbase 2090 LLC. Licensed under CC-BY-4.0. Report security issues privately via GitHub private vulnerability reporting or [email protected].

Block types

Any producer can emit the inert block types listed as Track 0 in Unverified output. Those blocks always render inside an unverified output container. Command structure is reserved for sealed shell integration.

Block	Purpose and rules
`paragraph`	Flowing proportional text runs.
`heading`	Levels 1 to 4, shown in the outline. Outline entries from unverified output carry the unverified label.
`table`	Real-layout table with column sizing and alignment, subject to the table limits.
`image`	PNG, JPEG or WebP by id, with alt text and an intrinsic size. Ids are scoped per producer. Images are never referenced from grids. The declared size is only a hint and never drives allocation or layout before a bounded decode. See Images.
`link`	Inline or block. See Links.
`section`	Collapsible container with a summary line. Collapsed children are excluded from copy and search until they are expanded. The summary shows a count of hidden content.
`code`	Monospace text with an optional language tag. Mixed-script tokens (for example Latin mixed with Cyrillic or Greek, per UTS 39) are flagged, and an ASCII-only copy is offered. Code blocks and copy-code buttons get the same confusable check and badge.
`command`	Prompt, input and output children, plus exit status. Created only from sealed shell-integration frames. Input tokens with mixed scripts or confusables are flagged before they run and on copy, and an ASCII-only copy is offered.
`grid`	Legacy VT surface with its own cols × rows on a PTY. See Grid blocks. An OSC title never names the producer in chrome.
`progress` / `status`	Live-updating, patchable widgets. Content only: they MUST NOT render permission prompts or trust badges, and the chrome shows their producer.