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feat: support the Skills extension (SEP-2640) with digest verification

Browse source 
Adds detection, enumeration, and conformance checking for the Skills
extension (`io.modelcontextprotocol/skills`) — phases 1 and 2 of #2234,
which is everything its Acceptance list names.

Skills is a *server*-declared extension, read off the connecting server's
`capabilities.extensions`, so it is deliberately absent from
`ADVERTISABLE_EXTENSIONS` — that registry is what the Inspector advertises
and the user toggles, and an entry there would be a meaningless toggle.

`skills/list` and `skills/get` are consumer-owned extension methods that
neither era codec defines, so the SDK's era gate skips them and they go out
as ordinary `client.request` calls with explicit result schemas. The
raw-wire channel modern `tasks/*` needs is not used, and the Skills tab is
not era-gated: a legacy-era server that declares the extension is serving it.

The checks are the point, not the list view. `core/mcp/skills.ts` reports
each obligation SEP-2640 states — the name/path invariant, the digest
format, the 512-entry and 16 MiB limits, and `resources: "dynamic"`, which
means integrity cannot be verified at all. Digest verification hashes the
fetched bytes with WebCrypto and returns a mismatch with both digests
attached rather than throwing, because showing a mismatch loudly is the
whole value proposition.

Files are fetched on demand: SEP-2640 is explicit that a `resources/read`
of a `SKILL.md` is not a load and confers no standing, so none of the SEP's
host machinery is implemented.

The `skills-http` fixture serves four skills over two pages, three of them
deliberately non-conforming — without those the verification code is
untestable.

Phase 3 (CLI, TUI, `resources/directory/read`, paged mode) is #2248.

Closes #2234

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018kfrH3uRNUM4JAk1reKtyY
Signed-off-by: cliffhall <cliff@futurescale.com>
This commit is contained in:
cliffhall 2026-09-04 20:01:13 -04:00
commit 63623b754b
1 changed files with 3684 additions and 4 deletions
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25
clients/web/src/components/groups/ConnectionInfoContent/ConnectionInfoContent.tsx
View file

@ -18,6 +18,8 @@ import type {
} from "@modelcontextprotocol/client";
import type { ServerType } from "@inspector/core/mcp/types.js";
import { TASKS_EXTENSION_KEY } from "@inspector/core/mcp/modernTaskSchemas.js";
import { SKILLS_EXTENSION_KEY } from "@inspector/core/mcp/skillsSchemas.js";
import { getSkillsExtension } from "@inspector/core/mcp/skills.js";
import type { OAuthClientRegistrationKind } from "@inspector/core/auth/types.js";
import {
CapabilityItem,
@ -259,6 +261,9 @@ export function ConnectionInfoContent({
}: ConnectionInfoContentProps) {
const { serverInfo, protocolVersion, capabilities, instructions } =
initializeResult;
// `undefined` when the server declared no Skills extension, which is what
// hides the section below — an absent extension has no sub-flags to report.
const skillsExtension = getSkillsExtension(capabilities);
// Only trust `serverInfo` when the server actually reported it; otherwise the
// name is a catalog fallback. Both rows `?.trim()` before the `||` (not `??`)
@ -362,6 +367,26 @@ export function ConnectionInfoContent({
</Stack>
</SimpleGrid>
{/* Skills (SEP-2640). The generic "Server Extensions" row above lists the
identifier, but not the one sub-option the extension defines —
`directoryRead`, which gates `resources/directory/read`. That flag is
exactly what a server author opens this modal to confirm, so it gets a
row of its own rather than being flattened into a key list (#2234). */}
{skillsExtension && (
<SimpleGrid cols={2}>
<Stack gap="xs">
<SectionHeading>Skills Extension</SectionHeading>
<ValueText>{SKILLS_EXTENSION_KEY}</ValueText>
</Stack>
<Stack gap="xs">
<SectionHeading>Directory Read</SectionHeading>
<ValueText data-testid="skills-directory-read">
{skillsExtension.directoryRead ? "Supported" : "Not supported"}
</ValueText>
</Stack>
</SimpleGrid>
)}
{instructions && (
<Stack gap="xs">
<SectionHeading>Server Instructions</SectionHeading>