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feat: support "draft" as a first-class spec version target (#255)

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* feat: support "draft" as a first-class spec version target

- Add LATEST_SPEC_VERSION and DATED_SPEC_VERSIONS constants so the next
  spec release is a one-line change in types.ts.
- Accept "draft" as a valid protocolVersion in the initialize check and
  mock-server response.
- --spec-version draft now selects latest-dated scenarios plus draft-tagged
  ones, so SEP authors can run the full suite against an SDK tracking the
  in-progress spec without retagging core scenarios.
- Forward --spec-version to the client process via
  MCP_CONFORMANCE_SPEC_VERSION so SDK examples can pick the matching
  protocolVersion.

Closes #253

* review: collapse SpecVersion to wire strings; dedup NEGOTIABLE_PROTOCOL_VERSIONS; split out 'extension'

Addresses review feedback from @felixweinberger and @mikekistler:

- SpecVersion is now always a wire protocolVersion string
  (DatedSpecVersion | typeof DRAFT_PROTOCOL_VERSION). The separate
  'draft' tag literal is gone from the type system; 'draft' survives
  only as a CLI input alias in resolveSpecVersion. Removes the
  tag-vs-wire confusion and the specVersionToProtocolVersion mapping.
- NEGOTIABLE_PROTOCOL_VERSIONS in types.ts is the single source for
  what the mock server accepts on initialize (was duplicated in
  checks/client.ts and scenarios/client/initialize.ts).
- 'extension' moved out of SpecVersion into a separate ScenarioSpecTag
  type. --spec-version extension is no longer valid; extension scenarios
  remain reachable via --suite extensions.
- Draft-tagged scenarios now use the DRAFT_PROTOCOL_VERSION constant
  so a draft revision bump is a one-line change in types.ts.
This commit is contained in:
Paul Carleton 2026-04-30 11:37:32 +01:00 • committed by GitHub
commit 17f1f93cc0
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1 changed files with 221 additions and 78 deletions
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10
src/scenarios/client/auth/offline-access.ts
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@ -1,5 +1,9 @@
import type { Scenario, ConformanceCheck } from '../../../types';
import { ScenarioUrls, SpecVersion } from '../../../types';
import {
ScenarioUrls,
SpecVersion,
DRAFT_PROTOCOL_VERSION
} from '../../../types';
import { createAuthServer } from './helpers/createAuthServer';
import { createServer } from './helpers/createServer';
import { ServerLifecycle } from './helpers/serverLifecycle';
@ -23,7 +27,7 @@ import { MockTokenVerifier } from './helpers/mockTokenVerifier';
*/
export class OfflineAccessScopeScenario implements Scenario {
name = 'auth/offline-access-scope';
specVersions: SpecVersion[] = ['draft'];
specVersions: SpecVersion[] = [DRAFT_PROTOCOL_VERSION];
description =
'Tests that a client that wants a refresh token handles offline_access scope and refresh_token grant type when AS supports them (SEP-2207)';
@ -227,7 +231,7 @@ export class OfflineAccessScopeScenario implements Scenario {
*/
export class OfflineAccessNotSupportedScenario implements Scenario {
name = 'auth/offline-access-not-supported';
specVersions: SpecVersion[] = ['draft'];
specVersions: SpecVersion[] = [DRAFT_PROTOCOL_VERSION];
description =
'Tests that client does not request offline_access when AS does not list it in scopes_supported (SEP-2207)';