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Bridge BAP with the W3C WebMCP standard by adding a discovery/discover protocol method that detects tools exposed by websites via declarative HTML attributes (form[toolname]) and the imperative navigator.modelContext API. WebMCP tools are also available through the existing observe flow via an opt-in includeWebMCPTools parameter. - New protocol types: WebMCPTool, DiscoveryDiscoverParams/Result - Server: progressive feature detection with graceful fallback - Client SDK: discoverTools() method - MCP bridge: discover_tools tool + observe integration - Docs: BAP vs WebMCP comparison, README section, adoption guide update
Add docs/browser-tools-guide.md — a fact-based decision guide comparing BAP with Playwright MCP and Playwright CLI, including reproducible benchmark data, architecture overview, and recommendation flowchart. - README: add discover_tools to tools table, add "Choosing a Browser Tool" section - docs/webmcp-comparison.md: add "Decision Guide: When to Use What" section - TODO-ADOPTION.md: mark benchmark table item done, add comparison framing anti-pattern
- README "Why BAP?" now cites benchmark result (73% fewer calls) instead of unverified "40x fewer tokens" - README CLI docs link: 26 commands → 23 commands - webmcp-comparison.md ecosystem row: 26 → 23 commands
Replace inflated "73% fewer tool calls" and "40x token reduction" claims with verified numbers from the reproducible benchmark suite. Three-variant model: BAP Standard (observe-first, apples-to-apples) uses ~15% fewer calls than Playwright. BAP Fused (optimization layer) uses ~37% fewer. Add "Where Playwright Wins" section covering latency, element disambiguation, setup simplicity, and ecosystem.
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Summary
discovery/discoverprotocol method that bridges BAP with the W3C WebMCP standardform[toolname]) and the imperativenavigator.modelContextAPIagent/observeflow via opt-inincludeWebMCPToolsparameterdiscover_toolsMCP tool for AI agents to discover page-exposed toolsChanges
Protocol (
packages/protocol)discovery.tstypes:WebMCPToolSource,WebMCPToolSchema,DiscoveryDiscoverParams/ResultAgentObserveParamswithincludeWebMCPToolsandAgentObserveResultwithwebmcpToolsdiscovery/discovertoBAPMethodSchemaenumServer (
packages/server-playwright)discoverWebMCPTools()helper with progressive feature detection (declarative + imperative, try-catch, graceful degradation)handleDiscoveryDiscover()handler + dispatch casehandleAgentObserve()to optionally include WebMCP toolsClient SDK (
packages/client)discoverTools(pageId?, options?)method onBAPClientMCP Bridge (
packages/mcp)discover_toolstool definition + handlerincludeWebMCPToolsparam added toobservetoolDocs
docs/browser-tools-guide.md— fact-based decision guide: BAP vs Playwright MCP vs Playwright CLI with reproducible benchmark data, architecture overview, and recommendation flowchartdocs/webmcp-comparison.md— full BAP vs WebMCP comparison + "Decision Guide: When to Use What" sectiondiscover_toolsto tools table, "Choosing a Browser Tool" section, WebMCP decision guide linkTODO-ADOPTION.md— adoption plan with messaging guide; marked benchmark table item as doneTests (5 new test files, all passing)
Test plan
pnpm build— all 7 packages build cleanlypnpm typecheck— no type errors (10 tasks)pnpm test— 450 tests pass, 0 failurespnpm lint— 0 errors (3 pre-existing warnings)discover_toolson a regular page → empty array