fix(conformance): correct SEP-1330 enum schemas in test_elicitation_sep1330_enums (#600)

## Correct SEP-1330 enum schemas in test_elicitation_sep1330_enums

**NB! This PR contains changes from #599 and should be rebased and
merged after #599 is merged.**

Update conformance test according to [test
requirements](https://github.com/modelcontextprotocol/conformance/blob/main/src/scenarios/server/elicitation-enums.ts#L14C1-L35C9).

- Fix legacyEnum: was using `oneOf` with const/title pairs; now
correctly uses `enum` + `enumNames` arrays per LegacyEnumSchema spec
- Fix titledMulti: items were using `oneOf` with extra `type:"string"`;
now correctly uses `anyOf` per TitledMultiSelectEnumSchema spec
- Fix return text format to match expected "Elicitation completed:
action=..., content=..."
- Remove _elicitation-sep1330-enums_ from conformance baseline (test now
passes)

## How Has This Been Tested?

```shell
./conformance-test/run-conformance.sh server
```

## Breaking Changes
No

## Types of changes

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

---------

Co-authored-by: devcrocod <devcrocod@gmail.com>

Author: kpavlov

conformance-test/README.md

@@ -111,15 +111,8 @@ Tests the conformance server against all server scenarios:
 
 ## Known SDK Limitations
 
-8 scenarios are expected to fail due to current SDK limitations (tracked in [
-`conformance-baseline.yml`](conformance-baseline.yml).
-
-| Scenario                              | Suite  | Root Cause                                                                                                     |
-|---------------------------------------|--------|----------------------------------------------------------------------------------------------------------------|
-| `elicitation-sep1330-enums`           | server | *(same as above)*                                                                                              |
-| `resources-templates-read`            | server | SDK does not implement `addResourceTemplate()` with URI pattern matching; resources are looked up by exact URI |
-| `elicitation-sep1034-client-defaults` | client | SDK does not fill in `default` values from the elicitation request schema before sending the response          |
-
+Scenarios, expected to fail due to current SDK limitations, are tracked in 
+[`conformance-baseline.yml`](conformance-baseline.yml).
 These failures reveal SDK gaps and are intentionally not fixed in this module.
 
 [list-scenarios-command]: https://github.com/modelcontextprotocol/conformance/tree/main?tab=readme-ov-file#list-available-scenarios

conformance-test/conformance-baseline.yml

@@ -1,7 +1,6 @@
 # Conformance test baseline - expected failures
 # Add entries here as tests are identified as known SDK limitations
 server:
-  - elicitation-sep1330-enums
   - resources-templates-read
 
 client:

conformance-test/src/main/kotlin/io/modelcontextprotocol/kotlin/sdk/conformance/ConformanceTools.kt

@@ -318,27 +318,22 @@ fun Server.registerConformanceTools() {
                         )
                     },
                 )
-                // Legacy titled (deprecated)
+                // Legacy titled (deprecated) - uses enum + enumNames arrays
                 put(
                     "legacyEnum",
                     buildJsonObject {
                         put("type", JsonPrimitive("string"))
                         put(
-                            "oneOf",
+                            "enum",
+                            JsonArray(listOf(JsonPrimitive("opt1"), JsonPrimitive("opt2"), JsonPrimitive("opt3"))),
+                        )
+                        put(
+                            "enumNames",
                             JsonArray(
                                 listOf(
-                                    buildJsonObject {
-                                        put("const", JsonPrimitive("opt1"))
-                                        put("title", JsonPrimitive("Option One"))
-                                    },
-                                    buildJsonObject {
-                                        put("const", JsonPrimitive("opt2"))
-                                        put("title", JsonPrimitive("Option Two"))
-                                    },
-                                    buildJsonObject {
-                                        put("const", JsonPrimitive("opt3"))
-                                        put("title", JsonPrimitive("Option Three"))
-                                    },
+                                    JsonPrimitive("Option One"),
+                                    JsonPrimitive("Option Two"),
+                                    JsonPrimitive("Option Three"),
                                 ),
                             ),
                         )
@@ -367,17 +362,16 @@ fun Server.registerConformanceTools() {
                         )
                     },
                 )
-                // Titled multi-select
+                // Titled multi-select - uses items.anyOf with const/title pairs
                 put(
                     "titledMulti",
                     buildJsonObject {
                         put("type", JsonPrimitive("array"))
                         put(
                             "items",
                             buildJsonObject {
-                                put("type", JsonPrimitive("string"))
                                 put(
-                                    "oneOf",
+                                    "anyOf",
                                     JsonArray(
                                         listOf(
                                             buildJsonObject {
@@ -405,7 +399,7 @@ fun Server.registerConformanceTools() {
             "Please review and update the form fields with defaults",
             schema,
         )
-        CallToolResult(listOf(TextContent(result.content.toString())))
+        CallToolResult(listOf(TextContent("Elicitation completed: action=${result.action}, content=${result.content}")))
     }
 
     // 12. Dynamic tool