feat: add experimental mcp destination type for MCP Events webhooks

.env.example

@@ -161,6 +161,12 @@
 # DESTINATIONS_WEBHOOK_SIGNATURE_ENCODING="hex"
 # DESTINATIONS_WEBHOOK_SIGNATURE_ALGORITHM="hmac-sha256"
 
+# MCP Events (experimental)
+# EXPERIMENTAL_MCP_ENABLED="true"
+# EXPERIMENTAL_MCP_ALLOW_INSECURE_CALLBACKS="false"
+# EXPERIMENTAL_MCP_RETRY_SCHEDULE="30,120,600"
+# EXPERIMENTAL_MCP_VERIFICATION_TTL_SECONDS="86400"
+
 # DISABLE_TELEMETRY=true
 
 # OpenTelemetry

.outpost.yaml.example

@@ -110,6 +110,15 @@ destinations:
     # signature_encoding: hex
     # signature_algorithm: hmac-sha256
 
+## MCP Events
+# Experimental. Registers the "mcp" destination type.
+# experimental:
+#   mcp:
+#     enabled: true
+#     allow_insecure_callbacks: false
+#     retry_schedule: [30, 120, 600]
+#     verification_ttl_seconds: 86400
+
 # Note: OpenTelemetry Configuration
 # It is recommended to configure OpenTelemetry using environment variables as they are better supported by the SDK.
 # Example environment variables: