Migrate all three clients + core + test-servers from
@modelcontextprotocol/sdk@1.29 to SDK v2 (2.0.0-beta.4), keeping behavior
identical against legacy (2025-11-25) servers. Foundation for the SDK V2 +
New Spec stack.
Packages
- Split @modelcontextprotocol/sdk -> @modelcontextprotocol/client (Client,
transports, OAuth, error taxonomy, protocol types) + core (Zod schemas);
stdio -> client/stdio, Ajv -> client/validators/ajv. Test-servers ->
@modelcontextprotocol/server (+ server-legacy/sse). Deterministic import
rewrite (schemas -> core, everything else -> client); the codemod misroutes
client code to /server so it was not used for path routing.
- new Client(..., { versionNegotiation: { mode: 'legacy' } }) — nothing
2026-era goes on the wire.
Runtime (core/mcp/inspectorClient.ts)
- Error taxonomy: McpError -> ProtocolError, ErrorCode -> ProtocolErrorCode;
RequestTimeout -> SdkError/SdkErrorCode.
- Handlers take method strings; task methods (tasks/*, notifications/tasks/*)
use the 3-arg custom form (excluded from v2's spec-method set).
- Legacy tasks kept working (per project requirement): requestor tasks re-
implemented over raw client.request + explicit deprecated schemas;
experimental.tasks.callToolStream replaced by a local pollTaskToolCall
async generator (with _progressHandlers revival so task-execution progress
still reaches the caller). Receiver (server-initiated) tasks: the v2 Client
validates a sampling/elicit handler result and rejects the legacy { task }
response with -32602 — installReceiverTaskResponseBypass swaps the wrapped
entry in the private _requestHandlers map for the task-augmented branch so
{ task } reaches the wire (fixes server-initiated sampling-via-task).
- Pagination: list verbs use raw client.request({method}, List*ResultSchema)
for single-page behavior (v2's client.listX() auto-aggregate all pages).
Web / auth / apps
- Rename local JsonSchemaType -> InspectorFormSchema + add toFormSchema()
structural narrowing at the SDK-schema -> form boundary.
- ext-apps still peers on SDK v1: one compat boundary with documented casts
(remove when ext-apps#702 lands a v2 peer).
- OAuth provider saveClientInformation reconciled with v2's
OAuthClientInformationContext; InvalidClientMetadataError re-homed as a
local class (server-legacy/auth is not browser-safe).
- vitest.shared.mts dedupes @modelcontextprotocol/client+core to one copy so
vi.mock intercepts the SUT's import.
Accepted v2 behavior changes (per #1624 / spec §9.2): unknown-tool call
rejects with -32602; cancellation is stream-abort (no guaranteed
notifications/cancelled frame); output-schema strictness restored via the
Inspector's own Ajv check on the default path.
npm run ci green: validate (web 3087 / cli 212 / tui 274 / launcher 5),
coverage (>=90 per-file, all clients), smoke (launcher/cli/web), storybook
(410).
Closes#1624
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* feat(apps): AppsScreen and InspectorView wiring (#1263)
Adds the Apps tab as a top-level screen composed of `AppListItem`,
`AppDetailPanel`, and `AppRenderer`. The screen is presentational —
selection, form values, running, and maximize state are local; data and
side effects come in via props and callbacks.
InspectorView filters `tools` through `isAppTool` (wrapped in a try/catch
so a malformed `_meta.ui.resourceUri` skips one tool instead of dropping
every following App), exposes the Apps tab in `ALL_TABS` after Tools, and
wires Phase-3 stub callbacks plus a stub bridge factory.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* refactor(apps): extract AppControls and rename Refresh button
Pulls the sidebar list, search input, "List updated" indicator, and
Refresh button out of `AppsScreen` into a dedicated `AppControls`
group, mirroring `ToolControls` and `TaskControls`. The Refresh button
moves from a full-width row beneath the list to the top-right of the
title row (single label "Refresh", matching `TaskControls`).
`AppsScreen` keeps the right-pane orchestration (selection, form,
running, maximize, header actions) and now delegates the entire
sidebar to `AppControls`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* chore(stories): seed InspectorView demo tools with MCP Apps
Adds three apps (Cohort Data, Weather Widget, Ops Dashboard) carrying
real `_meta.ui.resourceUri` to the demo tools list so the Apps tab has
content in the Default story alongside the existing tools.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* fix(apps): drop AppDetailPanel title row to avoid duplicate name
The parent AppsScreen header already shows the app name, so the panel's
own title/icon row rendered the name twice. Remove the title row (and
its now-unused imports, styled subcomponents, and the four tests that
asserted on title/icon rendering).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* refactor(resources): drop annotation badges from ResourceListItem
The list row now renders just the resource title/name. Audience and
priority badges remain visible in the preview/template panels, so the
data is still surfaced — just not duplicated in the picker. Drops the
now-unused AnnotationBadge import, the badge-only stories, and the
badge-rendering test.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* chore(apps): address review — share hasInputFields, show header icon
- Extracts the duplicated `Object.keys(inputSchema.properties ?? {}).length > 0`
check from `AppsScreen` (and the equivalent in `AppDetailPanel`'s
`hasFields`) into a shared `hasInputFields` helper in `toolUtils`,
with tests.
- Renders the selected tool's first icon next to the right-pane header
title in `AppsScreen`, restoring the icon visibility that was lost
when `AppDetailPanel`'s title row was removed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* chore(apps): finish hasInputFields extraction; document isOpening
- AppDetailPanel now actually calls the shared `hasInputFields` helper
instead of inlining the same `Object.keys(...).length > 0` check.
- AppsScreen comments why `isOpening={false}` is hardcoded: the screen
flips to AppRenderer synchronously, so the loading state is unreachable
here — the prop remains for standalone use and Phase 3 wiring.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* feat(apps): add AppListItem and AppDetailPanel groups (#1261)
Two presentational groups for the upcoming AppsScreen.
AppListItem (clients/web/src/components/groups/AppListItem/):
- Props { tool, selected, onClick }
- Renders tool.icons[0] (sized sm) when present, label (title ?? name),
two-line clamped description, and a trailing chevron affordance.
- Reuses ToolListItem's selected-state highlight (UnstyledButton bg via
--mantine-primary-color-light).
AppDetailPanel (clients/web/src/components/groups/AppDetailPanel/):
- Props { tool, formValues, isOpening, onFormChange, onOpenApp }
- Layout: optional icon + title row, optional description, divider,
SchemaForm bound to tool.inputSchema, full-width "Open App" button.
- "Open App" is disabled while isOpening or while any required input
field is empty (validation derived from tool.inputSchema.required).
- No annotations, progress, or cancel — execution is delegated to the
embedded app, not run as an MCP tool call from the panel.
Convention notes:
- Issue text references @tabler IconChevronRight / IconPlayerPlay; the
v2 web client already uses react-icons (md/ri namespaces), so this PR
uses MdChevronRight and MdPlayArrow for consistency rather than
introducing a second icon library.
Stories: AppListItem (Default, Selected, WithIcon, NoDescription, LongName);
AppDetailPanel (NoFields, SimpleStringParam, MultipleParams, WithIcon,
Opening, ComplexSchema).
Tests: 22 cases covering rendering branches, callback wiring, and the
disabled-button derivation. Per-file coverage 100% across lines,
statements, functions, and branches for both new components.
Closes#1261
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* fix(stories): inline SVG for WithIcon stories so they render reliably
The Wikipedia-hosted PNG used in the AppListItem and AppDetailPanel
WithIcon stories returned a broken image in Storybook (rate-limited /
hot-link blocked). Replace it with an inline SVG sun icon as a data
URI so the stories render offline, in Chromatic, and on any network.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* test(apps): address PR #1273 review feedback
- Extract resolveDisplayLabel(name, title?) to src/utils/toolUtils.ts and
migrate all four call sites (AppListItem, AppDetailPanel, ToolListItem,
ToolDetailPanel) to consume it. Avoids the fourth copy when the next
list/detail screen arrives. Includes a small unit suite.
- AppDetailPanel: only render the <Divider/> when the schema has at least
one property — previously a no-input app showed an orphaned separator
between the description and the Open App button.
- AppDetailPanel: align PanelTitle truncate to `true` (matches the
ItemLabel form used in AppListItem / ToolListItem); behaviorally
identical, just less surprising for future readers.
- AppDetailPanel: add an inline comment explaining that SchemaForm is
disabled only while isOpening, not while validation fails — users
should be able to keep filling required fields. The validation gate
lives on the Open App button.
- Extract the inline SUN_ICON_SVG data URI used by the WithIcon stories
to src/test/fixtures/storyIcons.ts so the next story that needs it
doesn't grow a third copy.
- Tests: add the AppDetailPanel divider-conditional cases (rendered
with fields, omitted without). Per-file coverage stays at 100% for
AppListItem, AppDetailPanel, ToolListItem, ToolDetailPanel, and the
new toolUtils. Suite: 70 files / 618 tests passing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* test(toolUtils): rename empty-string test for readability
Drops the doubled "is ... is preserved" phrase in the test name.
Behavior unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
cliffhall