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fix(types): forbid csp/permissions on McpUiToolMeta via never (#624)

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* fix(types): forbid csp/permissions on McpUiToolMeta via never

Hosts read _meta.ui.csp and _meta.ui.permissions from the resource
(resources/read content item, with resources/list entry as fallback),
never from the tool. Typing them as `never` on McpUiToolMeta gives
TypeScript users a compile-time error pointing at McpUiResourceMeta
instead of silently accepting and ignoring them.

Companion to anthropics/apps#38705 (host-side console.warn).
Refs anthropics/claude-ai-mcp#40.

* drop misleading #40 link from McpUiToolMeta.csp JSDoc
This commit is contained in:
Olivier Chafik 2026-04-21 13:49:07 +01:00 • committed by GitHub
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11
src/spec.types.ts
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@ -783,6 +783,17 @@ export interface McpUiToolMeta {
* - "app": Tool callable by the app from this server only
*/
visibility?: McpUiToolVisibility[];
/**
* `csp` belongs on the UI **resource** (see {@link McpUiResourceMeta}),
* not the tool. Hosts read it from the `resources/read` content item
* (with `resources/list` entry as fallback) and ignore it here.
*/
csp?: never;
/**
* `permissions` belongs on the UI **resource** (see {@link McpUiResourceMeta}),
* not the tool. Hosts ignore it here.
*/
permissions?: never;
}
/**