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fix: upgrade SDK to 0.6.0 and ensure tools capability is always enabled #1

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fix: upgrade SDK to 0.6.0 and ensure tools capability is always enabled #1

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391522d
fix: upgrade SDK to 0.6.0 and ensure tools capability is always enabled
ardzz Dec 19, 2025
b40ce83
docs: add Antigravity MCP configuration example
ardzz Dec 19, 2025
c514069
ci: add GitHub Actions workflow to build JAR
ardzz Dec 19, 2025
aaef4ae
Delete .github/workflows/build.yml
ardzz Dec 19, 2025
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2 changes: 1 addition & 1 deletion build.gradle.kts
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ repositories {
}

dependencies {
implementation("io.modelcontextprotocol:kotlin-sdk:0.5.0")
implementation("io.modelcontextprotocol:kotlin-sdk:0.6.0")
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2")
implementation("org.slf4j:slf4j-simple:2.0.17")

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12 changes: 11 additions & 1 deletion src/main/kotlin/net/portswigger/Main.kt
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Expand Up @@ -39,9 +39,19 @@ fun sseToStdio(args: SseToStdioArgs) = runBlocking {
}

val sseClient = sseClientManager.getClient()
// Ensure capabilities always include tools since Burp MCP Server supports them
// If serverCapabilities is null (disconnected state), create default caps with tools enabled
val serverCaps = sseClient.serverCapabilities ?: ServerCapabilities()
val capsWithTools = ServerCapabilities(
tools = serverCaps.tools ?: ServerCapabilities.Tools(listChanged = true),
resources = serverCaps.resources,
prompts = serverCaps.prompts,
logging = serverCaps.logging,
experimental = serverCaps.experimental
)
val stdioServer = Server(
serverInfo = sseClient.serverVersion ?: Implementation("burp-suite", "1.0"), options = ServerOptions(
capabilities = sseClient.serverCapabilities ?: ServerCapabilities()
capabilities = capsWithTools
)
)

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17 changes: 16 additions & 1 deletion src/main/kotlin/net/portswigger/SseClient.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ package net.portswigger
import io.ktor.client.*
import io.ktor.client.plugins.*
import io.ktor.client.plugins.sse.*
import io.ktor.client.request.*
import io.modelcontextprotocol.kotlin.sdk.Implementation
import io.modelcontextprotocol.kotlin.sdk.ResourceListChangedNotification
import io.modelcontextprotocol.kotlin.sdk.ToolListChangedNotification
Expand All @@ -24,12 +25,18 @@ class SseClient(
override val coroutineContext = SupervisorJob() + Dispatchers.IO

private val client = Client(clientInfo = clientInfo)
private val baseUrl = sseUrl.removeSuffix("/sse").removeSuffix("/")
private val httpClient = HttpClient {
install(SSE)
install(HttpTimeout) {
requestTimeoutMillis = 30000
connectTimeoutMillis = 15000
}
defaultRequest {
header("Origin", baseUrl)
header("Referer", baseUrl)
header("User-Agent", "MCP-Proxy")
}
Comment on lines +35 to +39
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Copilot AI Dec 19, 2025

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The headers set in the defaultRequest block are duplicated in the requestBuilder at lines 54-56. This duplication is unnecessary since defaultRequest already applies these headers to all HTTP requests made by this client. Consider removing the headers from either location to avoid redundancy.

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}

val connectionStateMutableStateFlow = MutableStateFlow(ConnectionState.DISCONNECTED)
Expand All @@ -40,7 +47,15 @@ class SseClient(
private var monitorJob: Job? = null

private fun createTransport(): SseClientTransport {
return SseClientTransport(httpClient, sseUrl)
return SseClientTransport(
client = httpClient,
urlString = sseUrl,
requestBuilder = {
header("Origin", baseUrl)
header("Referer", baseUrl)
header("User-Agent", "MCP-Proxy")
}
)
}

private fun startMonitoring() {
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