Implement SEP-973 (#570)
mcp/protocol: Implement SEP-973 - Define Icon structure, which includes source, mimeType and sizes. - sizes is any array of strings. refer https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1531 - Support setting websiteUrl, icons for mcp.Implementation - Support setting icons for mcp.Prompt - Support setting icons for mcp.Tool - Support setting icons for mcp.Resource Fixes #552
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Suraj Bobade
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mcp/testdata/conformance/server/spec-sep-973-additional-metadata.txtar
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mcp/testdata/conformance/server/spec-sep-973-additional-metadata.txtar
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Check behavior of server with Icons and websiteUrl metadata added as part of SEP-973 specification.
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check modelcontextprotocol/go-sdk/issues/552 for more details.
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Checks following:
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- Test setting websiteUrl, icons for mcp.Implementation
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- Test setting icons for mcp.Prompt
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- Test setting icons for mcp.Tool
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- Test setting icons for mcp.Resource
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- Test if tool call returning ResourceLink with icons works as expected
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-- tools --
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greetWithIcon
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contentTool
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-- prompts --
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code_reviewWithIcon
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-- resources --
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infoWithIcon
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-- client --
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{
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"jsonrpc": "2.0",
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"id": 1,
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"method": "initialize",
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"params": {
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"protocolVersion": "2025-06-18",
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"capabilities": {},
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"clientInfo": { "name": "ExampleClient", "version": "1.0.0" }
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}
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}
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{ "jsonrpc": "2.0", "method": "notifications/initialized" }
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{ "jsonrpc": "2.0", "id": 2, "method": "tools/list" }
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{ "jsonrpc": "2.0", "id": 3, "method": "resources/list" }
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{ "jsonrpc": "2.0", "id": 4, "method": "prompts/list" }
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{
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"jsonrpc": "2.0",
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"id": 5,
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"method": "tools/call",
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"params": {
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"name": "contentTool",
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"arguments": {
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"In": "resource1"
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}
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}
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}
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-- server --
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{
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"jsonrpc": "2.0",
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"id": 1,
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"result": {
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"capabilities": {
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"logging": {},
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"prompts": {
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"listChanged": true
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},
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"resources": {
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"listChanged": true
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},
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"tools": {
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"listChanged": true
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}
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},
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"protocolVersion": "2025-06-18",
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"serverInfo": {
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"name": "testServer",
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"version": "v1.0.0",
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"websiteUrl": "https://github.com/modelcontextprotocol/go-sdk",
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"icons": [
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{
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"src": "foobar",
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"mimeType": "image/png",
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"sizes": [
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"48x48",
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"96x96"
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],
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"theme": "light"
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}
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]
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}
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}
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}
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{
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"jsonrpc": "2.0",
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"id": 2,
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"result": {
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"tools": [
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{
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"description": "return resourceLink content with Icon",
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"inputSchema": {
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"type": "object",
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"required": [
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"In"
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],
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"properties": {
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"In": {
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"type": "string",
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"description": "the input"
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}
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},
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"additionalProperties": false
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},
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"name": "contentTool",
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"title": "contentTool"
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},
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{
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"description": "say hi",
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"inputSchema": {
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"type": "object",
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"required": [
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"Name"
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],
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"properties": {
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"Name": {
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"type": "string"
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}
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},
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"additionalProperties": false
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},
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"name": "greetWithIcon",
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"icons": [
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{
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"src": "foobar",
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"mimeType": "image/png",
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"sizes": [
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"48x48",
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"96x96"
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],
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"theme": "light"
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}
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]
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}
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]
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}
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}
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{
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"jsonrpc": "2.0",
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"id": 3,
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"result": {
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"resources": [
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{
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"mimeType": "text/plain",
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"name": "info",
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"uri": "embedded:info",
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"icons": [
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{
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"src": "foobar",
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"mimeType": "image/png",
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"sizes": [
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"48x48",
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"96x96"
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],
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"theme": "light"
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}
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]
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}
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]
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}
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}
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{
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"jsonrpc": "2.0",
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"id": 4,
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"result": {
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"prompts": [
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{
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"arguments": [
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{
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"name": "Code",
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"required": true
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}
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],
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"description": "do a code review",
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"name": "code_review",
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"icons": [
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{
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"src": "foobar",
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"mimeType": "image/png",
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"sizes": [
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"48x48",
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"96x96"
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],
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"theme": "light"
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}
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]
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}
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]
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}
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}
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{
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"jsonrpc": "2.0",
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"id": 5,
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"result": {
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"content": [
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{
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"type": "resource_link",
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"mimeType": "text/plain",
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"uri": "https://example.com/resource/resource1",
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"name": "Example Resource Link with Icons",
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"icons": [
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{
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"src": "foobar",
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"mimeType": "image/png",
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"sizes": [
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"48x48",
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"96x96"
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],
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"theme": "light"
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}
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]
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}
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]
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}
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}
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