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[PR #4616] [CLOSED] fix(mcp): leave shared observation providers to the transport that loads them #6334
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opened 2026-10-31 01:13:39 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/4616
Author: @starterio-dotcom
Created: 10/16/2026
Status: ❌ Closed
Base:
main← Head:claude/elegant-bartik-298d88📝 Commits (1)
ae966eefix(mcp): leave shared observation providers to the transport that loads them📊 Changes
7 files changed (+302 additions, -104 deletions)
View changed files
📝
src/application/OptionalObservationProviders.ts(+4 -1)📝
src/main/transport.ts(+0 -1)📝
src/server/createServer.ts(+4 -9)📝
tests/boundary/mcp/browserScenarioMcp.test.ts(+9 -88)📝
tests/boundary/mcp/serverLifecycleMcp.test.ts(+7 -4)📝
tests/boundary/process/browserScenarioProbeLifecycle.test.ts(+188 -1)➕
tests/fixtures/browserScenarioCapture.ts(+90 -0)📄 Description
Summary
capture_browser_scenarioover MCP could fail for the rest of the server process withcleanup_incomplete/ "Browser scenario provider is closing." even though no caller had closed anything. The process-shared Playwright scenario provider was being closed by a server instance that did not own it: when the MCP SDK's stdio entry discards itsserver/discoverprobe instance for a legacyinitializeon the same connection, that instance's provider cleanup closed the shared port, and the pinned replacement instance then answered every scenario call with the closing error. #2205 fixed this for 6.5.0 and #4274 reintroduced a server-side close behindoptionalObservationProviderOwner, whose default still closed injected ports. Refs #2195, #4274.Problem and expected behavior
Trigger: one stdio connection that opens with a modern
server/discoverand continues with a legacyinitialize, then callscapture_browser_scenario. Violated invariant: a resource is released only by its owner.startMcpTransportloads the optional observation ports once per process and hands the same instances to every server instance the SDK constructs, so a server instance must never close them. Expected: scenario calls on the pinned instance succeed, and the shared providers close exactly once at process shutdown.Change and scope
createServerno longer closes the injected browser, browser-scenario, or Electron observation ports; theoptionalObservationProviderOwneroption is removed because the server never constructs those ports and therefore never owns them.startMcpTransportremains the single owner and closes them once at process shutdown (unchanged behavior, no longer dependent on a flag).OptionalObservationProviders.capture-browser-scenario) is unchanged: it still creates and closes its own provider per command.Not included: the Windows
run-exclusivewrapper's dependency on the packaged native addon, which surfaced while validating this change, is handled separately.Contribution scope: ordinary fix within existing lifecycle boundaries; maintainer scope decision not applicable.
Contract and boundary impact
startMcpTransport(src/main/transport.ts) owns the loaded optional observation ports;createServer(src/server/createServer.ts) drops its close branch for them.CreateServerOptions.optionalObservationProviderOwneris removed; it was an internal composition option, not a CLI or MCP contract.Expected effects: lifecycle ownership only; this change adds no target interaction.
Evidence and regression coverage
tests/boundary/process/browserScenarioProbeLifecycle.test.ts: new test that drives the productionserveStdioentry over an in-memory wire through a modernserver/discoverprobe, a legacyinitialize, and acapture_browser_scenariocall on the pinned instance, then asserts the provider closes exactly once at process shutdown.tests/boundary/mcp/serverLifecycleMcp.test.ts: the bound-service shutdown test now asserts that an injected scenario port is never closed byserver.close().tests/fixtures/browserScenarioCapture.ts: the valid fake capture builder, shared by the scenario MCP tests.eaf88aca), a raw stdio JSON-RPC script sendingserver/discover→ legacyinitialize→tools/call capture_browser_scenarioreturned:{"error":{"code":"cleanup_incomplete","category":"execution_failure","message":"Browser scenario provider is closing.",...,"details":{"operation":"capture_browser_scenario","reason":"cleanup_failed","cleanup":"incomplete","resources":[],"cleanup_reason":"Provider is closing","execution_failure":"unreadable_output"}}}With the legacy
initializeonly, the same call reached the provider. On this branch, temporarily restoring the server-side close ofoptions.browserScenarioCapturemade both probe tests fail (expected "vi.fn()" to not be called at all, but actually been called 1 times); with the change they pass.For evidence-bearing changes:
Validation performed
npm run check:fast— typecheck and lint, 2 tasks successful.npm run test:focused -- tests/boundary/process/browserScenarioProbeLifecycle.test.ts tests/boundary/mcp/serverLifecycleMcp.test.ts tests/boundary/mcp/browserScenarioMcp.test.ts tests/boundary/mcp/shutdown.test.ts tests/boundary/mcp/optionalProviderIsolation.test.ts src/server/shutdownRegistration.test.ts— 6 files, 29 tests passed (Windows 11, Node 24.21.0; the packaged Windows native artifact was restored from the rea-agents@6.5.0 tarball so the build step and SQLite lifecycle cases could run).Compatibility, safety, and release
CreateServerOptions.optionalObservationProviderOwneris removed; no caller outsidesrc/main/transport.tspassed it.Author readiness
Human owner: @starterio-dotcom
Before merge
type(scope): outcome.🤖 Generated with Claude Code
🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.