[ochafik]

Minor release (new public API and behavior from #829: the WebMCP bridge and its webMcpBridge opt-out). Version bump via npm run bump 2.1.0 — root + all workspaces, workspace dependency ranges moved to ^2.1.0 by the bump script, lockfile synced (version strings only, verified clean npm ci --dry-run on npm 10 and 11).

After merge, create the GitHub release — https://github.com/modelcontextprotocol/ext-apps/releases/new?tag=v2.1.0&title=v2.1.0 — with this body (copy button in the block's corner):

## What's Changed

Minor release: the SDK gains WebMCP interoperability, and the pdf-server example gets strict annotation validation.

### Features

- **WebMCP interoperability** — instead of choosing between `App.registerTool` and [WebMCP](https://webmachinelearning.github.io/webmcp/), the SDK now bridges them in both directions: tools registered with `App.registerTool()` are mirrored into `document.modelContext` when the document provides one, and tools the page registers on `document.modelContext` are served over the Apps `tools/list` / `tools/call` channel (the SDK declares the `tools` capability on the View's behalf and relays `toolchange` as `notifications/tools/list_changed`). No new wire messages, no host-side API changes. The whole bridge is a per-App opt-out: `webMcpBridge: false` (default `true`, also exposed through `useApp`). The draft spec's "Relation to WebMCP" section becomes a normative "WebMCP Interoperability" section with the WebMCP ↔ MCP mapping table. In [#829](https://github.com/modelcontextprotocol/ext-apps/pull/829)

### Bug Fixes

- **pdf-server: annotations validated with per-type schemas** — stamps often rendered as the literal text "undefined" when sent with `content` (note/freetext's field) instead of `label`; the loose `z.record` annotation shape let that through on both tool surfaces. Annotations are now validated against strict per-type schemas shared by the view's app tools and the server-mediated `interact` (stamp requires `label`, note/freetext require `content`, image requires `imageUrl` or `imageData`; unknown keys are errors), with render/save fallbacks for annotations persisted before validation. In [#832](https://github.com/modelcontextprotocol/ext-apps/pull/832)

**Full Changelog**: https://github.com/modelcontextprotocol/ext-apps/compare/v2.0.4...v2.1.0

---

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