d150772e24* feat: add MCP Apps extension (io.modelcontextprotocol/ui) support Adds support for the MCP Apps protocol extension, which lets servers expose interactive HTML UIs as resources rendered by spec-conforming clients (e.g. Goose) in sandboxed iframes. - Generic extension plumbing: ServerExtensionInterface and Builder::enableExtension(), with extensions advertised under capabilities.extensions during the initialize handshake. ClientCapabilities/ServerCapabilities gain an extensions field. - Schema DTOs under Mcp\Schema\Extension\Apps: the McpApps marker, UiToolMeta, ToolVisibility enum, UiResourceContentMeta, UiResourceCsp, and UiResourcePermissions (with empty-object presence markers per spec). - A worked weather example under examples/server/mcp-apps/ with a minimal spec-conforming view (ui/initialize handshake, postMessage JSONRPCMessage objects, and ResizeObserver-driven size reporting). - docs/extensions.md guide with pointers from index.md and examples.md to the ext-apps repository for the TypeScript SDK and richer view-side patterns. - Unit and inspector snapshot test coverage. Spec: https://github.com/modelcontextprotocol/ext-apps * Type UiToolMeta visibility as ToolVisibility enum Also fix UiResourceContentMeta::jsonSerialize() return phpdoc. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * Address review nitpicks for MCP Apps extension Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * Apply PR review feedback for MCP Apps extension Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * Add regression tests and CHANGELOG entry for capabilities extensions - Pin the is_array() guards on extensions in ServerCapabilities and ClientCapabilities::fromArray() with explicit non-array payload tests. - Pin the isset()-rejects-null contract in UiResourcePermissions::fromArray(). - Surface the new extensions field on both capability classes in CHANGELOG. - Inline the ?: idiom in Builder::build() to match the surrounding style. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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MCP PHP SDK Guides
- MCP Elements — Core capabilities (Tools, Resources, Resource Templates, and Prompts) with registration methods.
- Server Builder — Fluent builder class for creating and configuring MCP server instances.
- Client — Client SDK for connecting to and communicating with MCP servers.
- Transports — STDIO and HTTP transport implementations with guidance on choosing between them.
- Server-Client Communication — Methods for servers to communicate back to clients: sampling, logging, progress, and notifications.
- Protocol Extensions — Opt-in protocol extensions announced during capability negotiation, including MCP Apps (HTML UI resources).
- Examples — Example projects demonstrating attribute-based discovery, dependency injection, HTTP transport, and more.