Wires the buildModalShellV1 pen-core builder through the full MCP
toolchain — handler + schema + dispatch + shim + SERVER_BUILDERS
+ parity CASES + handler tests + elements.md skill — so external
MCP clients (Claude Code / Codex / Gemini CLI) can call
add_modal_shell_v1 as a first-class tool alongside the 62 v0
tools.
Three theme variants exposed via `theme` param (enum [light, dark,
system]):
- omitted / `'light'`: byte-parity with add_modal_shell_v0
(same hex, same structure, same role tree)
- `'dark'`: hardcoded dark palette (#1E293B card, #F1F5F9 title,
#94A3B8 muted). No \$refs needed.
- `'system'`: emits \$color-surface / \$color-text-primary /
\$color-text-muted refs. Caller MUST have run
applySemanticPalette(doc) first or refs resolve to undefined
(documented in schema description).
Scrim stays #000000 in ALL themes — modal backdrops are a dim
effect, not a themeable surface. Pinned by handler test.
9 handler test cases cover: registration + schema shape +
required[title] + theme variants + scrim invariant + bogus
parent_id rejection. Parity test added a CASES entry with
\`theme:'dark'\` args (exercises the theme branch in both
shim and server paths).
elements.md gained:
- §46b decision-tree entry pointing to the v1 variant
- Trigger list entry for dark-mode / theme-aware prompts
- Minimal usage showing \`theme:'dark'\` + \`theme:'system'\`
This is the reference implementation for the remaining 9 theme-
aware v1 tools in the top-10 offenders list (empty-chart,
chip-input, toast, pagination, notification-row, image-placeholder,
faq-item, comment, checkbox — per dark-theme-audit §offenders).
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