Add conformance-server: host conformance test harness (addresses #674)#693
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qchuchu wants to merge 1 commit into
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Add conformance-server: host conformance test harness (addresses #674)#693qchuchu wants to merge 1 commit into
qchuchu wants to merge 1 commit into
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A WPT-style host-conformance test runner for the MCP Apps spec (2026-01-26): ships a ui:// page that renders inside the host's sandboxed iframe, drives the postMessage/JSON-RPC bridge, asserts host behaviour against the spec, and reports PASS/FAIL right in the iframe. First step toward modelcontextprotocol#674 (public MCP Apps platform tests). Mirrors the basic-server-react layout/toolchain and is registered alongside the other examples in both E2E specs and both publish workflows. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
Adds
examples/conformance-server, a host-conformance test harness for theMCP Apps spec (
2026-01-26), modeled on web-platform-tests. It ships a singleui://runner that renders inside the host's sandboxed iframe, drives thepostMessage/JSON-RPC bridge, asserts the host's behaviour against the spec, and
reports PASS/FAIL right in the iframe.
This is a concrete first step toward #674 ("Set up public MCP Apps platform
tests"): the in-iframe runner that a public wpt.fyi-style grid would later
aggregate across hosts. Opening per the examples policy; happy to adjust scope.
What's included
examples/conformance-server/: React runner plus MCP server, mirroring thebasic-server-reactlayout and toolchain (vite + bun build, stdio/HTTP entry).normative requirement in the spec, each tagged with its RFC-2119 clause, a
vantage (where it's observable: in-view / host / server), and status.
24 of 45 implemented today (in-view automatic checks plus 6 human-in-the-loop).
debug-servereverywhere it belongs: both E2E specs(
servers.spec.ts,generate-grid-screenshots.spec.ts) and both publishworkflows (
pkg-pr-newplus npm matrix).Testing
npm run buildplusnpm run --workspace examples/conformance-server build: cleannpm run prettier: cleanrendering);
servers.spec.tspasses for the new server.Checklist
npm run prettier)🤖 Generated with Claude Code