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fix: validate protocol version header on initialization requests (#697)

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Validate `mcp-protocol-version` HTTP header during `InitializeRequest`

Fix `DEFAULT_NEGOTIATED_PROTOCOL_VERSION` to match the spec

fixes #547 

## How Has This Been Tested?
Updated existing test (removed TODO referencing #547) to verify init
request

## Breaking Changes
none

## 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
- [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
- [x] I have added appropriate error handling
- [x] I have added or updated documentation as needed
This commit is contained in:
Pavel Gorgulov 2026-04-15 14:12:05 +02:00 • committed by GitHub
commit bce6811b66
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1 changed files with 49 additions and 24 deletions
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2
kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types/common.kt
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@ -12,7 +12,7 @@ import kotlinx.serialization.json.JsonObject
public const val LATEST_PROTOCOL_VERSION: String = "2025-11-25"
/** The default protocol version used when negotiation is not performed. */
public const val DEFAULT_NEGOTIATED_PROTOCOL_VERSION: String = "2025-06-18"
public const val DEFAULT_NEGOTIATED_PROTOCOL_VERSION: String = "2025-03-26"
/** All MCP protocol versions supported by this SDK. */
public val SUPPORTED_PROTOCOL_VERSIONS: List<String> = listOf(