fix(playground): connect a server without leaving the Playground (BB-134) - #4501
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…134)
The Tools rail's zero-server empty state offered a "Connect a server" button
wired to navigate(routePaths.servers), so the one affordance the Playground
gave you for connecting a server also unmounted the Playground. Users had to
navigate back to chat with the server they had just connected.
The button now opens AddServerModal in place — the same modal the composer's
"+" menu and the header's Add Server button already use. Three pieces: the
playground state hook returns its onConnect handler, the Tools rail owns the
modal, and ToolList calls the handler when it has one.
The rail's zero-server body moved into its own component because ToolsBody
returns early for the environment and multi-server cases, and the modal's
useState cannot sit past those returns.
Surfaces that mount the playground state without a connect handler — the Evals
embedded chat — keep the Servers navigation.
ToolList.test.tsx asserted navigate("/servers") for this button. It now asserts
the handler runs and nothing navigates, with the old behavior kept as the
no-handler fallback case.
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. WalkthroughThe Playground Tools empty state now supports in-place server connection through the existing Add Server modal. The connection callback flows from Playground state through Merge Risk: ⚪ Minimal · up to The Playground now opens the existing server-connection modal without leaving the page, while surfaces without connection support retain their previous navigation behavior. No actionable merge-blocking risk remains after normal checks and review. Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Inline comments:
In
`@mcpjam-inspector/client/src/components/ui-playground/hooks/use-playground-state.ts`:
- Line 1067: Add a focused hook or provider test covering usePlaygroundState
with an onConnect input, and assert that the returned context state exposes the
exact supplied callback. Ensure the test exercises the actual mapping rather
than mocking usePlaygroundStateContext, preserving the callback so the Tools
rail can open the modal instead of using its Servers fallback.
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.changeset/playground-connect-in-place.mdmcpjam-inspector/client/src/components/playground/PlaygroundLeftRail.tsxmcpjam-inspector/client/src/components/playground/__tests__/PlaygroundLeftRail.test.tsxmcpjam-inspector/client/src/components/ui-playground/PlaygroundLeft.tsxmcpjam-inspector/client/src/components/ui-playground/ToolList.tsxmcpjam-inspector/client/src/components/ui-playground/__tests__/ToolList.test.tsxmcpjam-inspector/client/src/components/ui-playground/hooks/use-playground-state.ts
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…-connect-in-place
SebasKoria
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SebasKoria
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Three notes:
I think you can dismiss CodeRabbit's comment about testing the usePlaygroundState → context mapping. UsePlaygroundStateReturn is ReturnType, so if onConnect came off that object literal, the const { onConnect } = state destructure in ZeroServerToolsBody would fail typecheck. The regression it's asking for a test against is already a compile error.
The new call site doesn't fire an analytics event. ActiveServerSelector does track("connecting_server", { location: "active_server_selector" }) on submit. The modal's own add_server_button_clicked still fires so connections aren't invisible, but there's no way to tell this rail is where someone connected from. Fine as a follow-up if you'd rather not grow the diff.
In PlaygroundLeftRail.test.tsx, the "leaves the button on its Servers fallback" case asserts the mocked PlaygroundLeft button is disabled, so it's checking the mock's wiring rather than that the real button navigates. The real fallback is covered in ToolList.test.tsx, so the behavior isn't untested — just noting the test proves less than its name reads like.
Branch is ~95 commits behind main, so worth updating it so CI runs against what actually ships.
Every other AddServerModal submit site tags where the connection came from --
active_server_selector, servers_tab, json_import_modal. The rail's new submit
handler didn't, so a connection made from the Playground empty state was
indistinguishable from any other in the funnel: the modal's own
add_server_button_clicked still fired, but nothing said this rail was the
origin. Adds location: "playground_tools_rail", matching ActiveServerSelector.
Also renames the fallback test. "leaves the button on its Servers fallback"
asserted the MOCK PlaygroundLeft button was disabled, which only proves the
rail passed no onAddServerRequested -- the real button isn't disabled at all,
it navigates. That navigation is already pinned in ToolList.test.tsx ("routes
to Servers when the caller cannot connect in place"). The test now says what
it checks.
…-connect-in-place
Types already cover an omitted field: UsePlaygroundStateReturn is
ReturnType<typeof usePlaygroundState>, so dropping onConnect from the return
literal fails the Tools rail's `const { onConnect } = state` destructure --
verified as error TS2339 at PlaygroundLeftRail.tsx(203,11). What they do not
cover is a same-signature mis-wire, and there is a live candidate for one: the
coalesced `onConnect ?? (() => {})` passed to useOnboarding in the same
function. Returning that instead typechecks and makes the field always truthy,
so the rail would open the modal on surfaces that supply no handler -- the
Evals embedded chat -- instead of routing them to Servers.
An identity assertion alone does not catch it: with a handler supplied, `??`
yields that same handler, so the mis-wired version passes. The absence case is
the one that fails (expected [Function] to be undefined), confirmed by applying
the mis-wire before keeping the test. Both cases are pinned -- identity when a
handler is given, undefined when it is not.
Runs the real hook rather than a mock of it: one vi.mock for convex/react as
scaffolding, and the app's own PreferencesStoreProvider and SidebarProvider.
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All four addressed. Pushed as 1. Dismissing CodeRabbit — right, and I checked rather than took it. Removed That's the One residue your argument doesn't cover, so I added a test for it: types catch an omitted field, not a same-signature mis-wire — and there's a live candidate for one in The test nearly ended up worthless: an identity assertion does not catch it, because with a handler supplied 2. Analytics — in, not deferred. track("connecting_server", { location: "playground_tools_rail" });Asserted in the connect test so it can't drop out silently. 3. The fallback test. Confirmed — the mock's button is 4. Behind main. Was worse than the PR showed — the branch had an unpushed merge of an older main sitting locally, still 30 commits back. Merged current Verification on the merged tree:
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SebasKoria
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SebasKoria
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All four addressed, verified against the merged tree. CI green, cubic ran and passed this time.
The onConnect ?? (() => {}) catch is the real find here — I'd stopped at "the compiler covers an omitted field" and missed that it doesn't cover a same-signature substitution. Good call testing it rather than taking my word, and good call noticing the identity assertion alone wouldn't have caught it.
Also confirmed connecting_server is already registered in shared/analytics-events.ts and location is free-form, so nothing else needed updating for the new origin.
3 participants
Clicking "Connect a server" in the Playground's Tools rail called
navigate(routePaths.servers), so the one affordance the Playground gave you for connecting a server also unmounted the Playground. You then had to navigate back to chat with the server you had just connected. Reported by Prathmesh and Vignesh in Slack; closes BB-134.What changed
The button opens
AddServerModalin place — the same modal the composer's "+" menu and the header's Add Server button already use.use-playground-state.tsreturns itsonConnecthandler. It was already accepted as an option and used internally for onboarding, but never exposed on the context, so the rail had no way to connect anything.PlaygroundLeftRail.tsxowns the modal in a newZeroServerToolsBody. Separate component becauseToolsBodyreturns early for the environment and multi-server cases, and auseStatepast those returns would run conditionally.ToolList.tsxcalls the handler when it has one, mirroring theonAddServerRequestedcontractActiveServerSelectoralready uses.Surfaces that mount the playground state without a connect handler — the Evals embedded chat — keep the Servers navigation, so the button never goes dead.
Not in scope
The ticket also asks that the user stay on the Playground after a successful connection. That already works:
captureCurrentReturnPath()records the current path before the OAuth authorization redirect and the callback restores it. No change needed.Tests
ToolList.test.tsxassertednavigate("/servers")for this button; it now asserts the handler runs and nothing navigates, with the old behavior kept as the no-handler fallback case. NewPlaygroundLeftRail.test.tsxcovers the wiring — the button opens the modal, and submitting it callsonConnect. I mutated the wiring to confirm that test goes red without the fix.Verification
npm run typecheck— exit 0npm run typecheck:client -w @mcpjam/inspector— exit 0, tier-b guard includednpm run test -w @mcpjam/inspector— 19595 passed, 18 failed across 9 files, none underclient/. Five are the known Windows-local failures (plugin-vm-shim,local-stdio.desktop,repoFiles,local-machine,eval-compare-dto); the rest are environment:EPERM ... symlink(Windows needs elevation), one 30s timeout under load, andws-native-fallbackasserting against build output.docs:check-tokensand design-systemtokens-parityfail locally on CRLF and pass on CI. The diff touches neither.Not verified in a browser. Worth a 30-second manual check: open the Playground with no servers connected, Tools rail, click "Connect a server" — the modal should open over the Playground instead of jumping to Servers.
Summary by cubic
Fixes BB-134 by changing the Playground Tools rail’s zero-server “Connect a server” action from navigating to Servers to opening the Add Server modal in place, so users stay in the Playground while connecting. Surfaces without a connect handler, including Evals embedded chat, retain the navigation fallback; Playground connections are tagged
playground_tools_rail.Implementation
onConnectthrough playground state andPlaygroundLefttoToolList.Written for commit 24f5cc2. Summary will update on new commits.