580 lines
21 KiB
V
580 lines
21 KiB
V
// Spec-compliance tests for MCP 2025-11-25 wire shapes.
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// These tests intentionally check the JSON shape of responses and notifications
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// produced by the server against the published schema:
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// https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/schema/2025-11-25/schema.json
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// Add new cases here whenever a schema field is touched.
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module mcp
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import json
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fn build_initialized_session(mut server Server) {
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server.dispatch_message(Request{
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id: encode_id(1)
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method: 'initialize'
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params: encode_initialize_params(InitializeParams{
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protocol_version: protocol_version
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capabilities: '{"roots":{"listChanged":true}}'
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client_info: Implementation{
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name: 'compliance'
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version: '0'
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}
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})
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}.encode(), stdio_session_id, .stdio) or { panic(err) }
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server.dispatch_message(new_notification('notifications/initialized', empty).encode(),
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stdio_session_id, .stdio) or { panic(err) }
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}
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fn test_initialize_result_shape_matches_spec() {
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mut server := new_server(name: 's', version: '0', enable_logging: true)
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server.add_tool(Tool{ name: 't' }, fn (_ Context, _ string) !ToolResult {
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return tool_text_result('ok')
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})!
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dispatch := server.dispatch_message(Request{
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id: encode_id(1)
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method: 'initialize'
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params: encode_initialize_params(InitializeParams{
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protocol_version: protocol_version
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capabilities: '{}'
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client_info: Implementation{
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name: 'c'
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version: '0'
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}
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})
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}.encode(), stdio_session_id, .stdio)!
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response := decode_response(dispatch.response)!
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assert response.error.code == 0
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result := response.decode_result[InitializeResult]()!
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assert result.protocol_version == protocol_version
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assert result.server_info.name == 's'
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assert result.server_info.version == '0'
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assert result.capabilities.contains('"tools":{"listChanged":true}')
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assert result.capabilities.contains('"logging":{}')
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}
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fn test_jsonrpc_envelope_includes_required_fields() {
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mut server := new_server(name: 's', version: '0')
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'ping', empty).encode(), stdio_session_id,
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.stdio)!
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envelope := json.decode(MessageEnvelope, dispatch.response)!
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assert envelope.jsonrpc == '2.0'
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assert envelope.id == '2'
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assert envelope.result == '{}'
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assert envelope.method == ''
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assert envelope.error.code == 0
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}
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fn test_tools_list_response_uses_input_schema_field() {
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mut server := new_server(name: 's', version: '0')
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server.add_tool(Tool{
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name: 'test'
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description: 'd'
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input_schema: '{"type":"object","properties":{"x":{"type":"string"}}}'
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}, fn (_ Context, _ string) !ToolResult {
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return tool_text_result('ok')
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'tools/list', empty).encode(),
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert body.contains('"inputSchema":{"type":"object","properties":{"x":{"type":"string"}}}')
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assert body.contains('"name":"test"')
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}
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fn test_tool_call_result_has_is_error_and_content_array() {
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mut server := new_server(name: 's', version: '0')
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server.add_tool(Tool{ name: 'fails' }, fn (_ Context, _ string) !ToolResult {
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return error('boom')
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message('{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"fails","arguments":{}}}',
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert body.contains('"isError":true')
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assert body.contains('"content":[')
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assert body.contains('"type":"text"')
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}
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fn test_resources_list_uses_camel_case_mime_type() {
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mut server := new_server(name: 's', version: '0')
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server.add_resource(Resource{
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uri: 'res://a'
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name: 'a'
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mime_type: 'text/plain'
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}, fn (_ Context, uri string) !ReadResourceResult {
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return ReadResourceResult{
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contents: [
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ResourceContents{
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uri: uri
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mime_type: 'text/plain'
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text: 'hi'
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},
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]
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}
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})!
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build_initialized_session(mut server)
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list_dispatch := server.dispatch_message(new_request(2, 'resources/list', empty).encode(),
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stdio_session_id, .stdio)!
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list_body := decode_response(list_dispatch.response)!.result
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assert list_body.contains('"mimeType":"text/plain"')
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assert !list_body.contains('"mime_type"')
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read_dispatch := server.dispatch_message(new_request(3, 'resources/read', ReadResourceParams{
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uri: 'res://a'
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}).encode(), stdio_session_id, .stdio)!
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read_body := decode_response(read_dispatch.response)!.result
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assert read_body.contains('"mimeType":"text/plain"')
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}
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fn test_resource_templates_list_uses_camel_case_uri_template() {
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mut server := new_server(name: 's', version: '0')
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server.add_resource_template(ResourceTemplate{
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uri_template: 'res://a/{x}'
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name: 'a'
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'resources/templates/list', empty).encode(),
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert body.contains('"resourceTemplates"')
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assert body.contains('"uriTemplate":"res://a/{x}"')
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}
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fn test_progress_notification_uses_camel_case_progress_token() {
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mut server := new_server(name: 's', version: '0')
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server.add_tool(Tool{ name: 'work' }, fn (ctx Context, _ string) !ToolResult {
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ctx.notify_progress(0.5, 1.0, 'half')
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return tool_text_result('done')
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})!
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build_initialized_session(mut server)
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server.dispatch_message('{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"work","arguments":{},"_meta":{"progressToken":"abc"}}}',
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stdio_session_id, .stdio)!
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queue := server.drain_session_notifications(stdio_session_id)
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assert queue.len == 1
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notif := decode_notification(queue[0])!
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assert notif.method == 'notifications/progress'
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assert notif.params.contains('"progressToken":"abc"')
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}
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fn test_logging_message_uses_rfc5424_levels() {
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levels := [
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LogLevel.debug,
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LogLevel.info,
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LogLevel.notice,
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LogLevel.warning,
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LogLevel.error,
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LogLevel.critical,
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LogLevel.alert,
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LogLevel.emergency,
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]
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expected := ['debug', 'info', 'notice', 'warning', 'error', 'critical', 'alert', 'emergency']
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for i, level in levels {
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assert level.str() == expected[i]
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parsed := parse_log_level(expected[i]) or { panic('failed to parse ${expected[i]}') }
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assert parsed == level
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}
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}
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fn test_error_codes_match_jsonrpc_specification() {
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assert parse_error.code == -32700
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assert invalid_request.code == -32600
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assert method_not_found.code == -32601
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assert invalid_params.code == -32602
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assert internal_error.code == -32603
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assert server_not_initialized.code == -32002
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}
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fn test_pagination_emits_next_cursor_when_more_pages_exist() {
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mut server := new_server(name: 's', version: '0')
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for i in 0 .. default_list_page_size + 5 {
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server.add_tool(Tool{ name: 'tool_${i}' }, fn (_ Context, _ string) !ToolResult {
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return tool_text_result('ok')
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})!
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}
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build_initialized_session(mut server)
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first_dispatch := server.dispatch_message(new_request(2, 'tools/list', empty).encode(),
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stdio_session_id, .stdio)!
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first := decode_response(first_dispatch.response)!.decode_result[ListToolsResult]()!
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assert first.tools.len == default_list_page_size
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assert first.next_cursor == default_list_page_size.str()
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second_dispatch := server.dispatch_message(Request{
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id: encode_id(3)
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method: 'tools/list'
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params: '{"cursor":"${first.next_cursor}"}'
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}.encode(), stdio_session_id, .stdio)!
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second := decode_response(second_dispatch.response)!.decode_result[ListToolsResult]()!
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assert second.tools.len == 5
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assert second.next_cursor == ''
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}
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fn test_completion_result_matches_spec_shape() {
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mut server := new_server(name: 's', version: '0')
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server.add_completion(CompletionRef{ ref_type: 'ref/prompt', name: 'p' }, 'arg', fn (_ Context, _ string, _ string) !CompletionResult {
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return CompletionResult{
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values: ['a', 'b']
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total: 2
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has_more: false
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}
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message('{"jsonrpc":"2.0","id":2,"method":"completion/complete","params":{"ref":{"type":"ref/prompt","name":"p"},"argument":{"name":"arg","value":""}}}',
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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// The result MUST be wrapped in a `completion` object per spec.
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assert body.starts_with('{"completion":{')
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assert body.contains('"values":["a","b"]')
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assert body.contains('"total":2')
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assert body.contains('"hasMore":false')
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}
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fn test_initialize_blocks_other_methods_until_notifications_initialized_received() {
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mut server := new_server(name: 's', version: '0')
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server.dispatch_message(Request{
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id: encode_id(1)
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method: 'initialize'
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params: encode_initialize_params(InitializeParams{
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protocol_version: protocol_version
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capabilities: '{}'
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client_info: Implementation{
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name: 'c'
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version: '0'
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}
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})
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}.encode(), stdio_session_id, .stdio)!
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dispatch := server.dispatch_message(new_request(2, 'tools/list', empty).encode(),
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stdio_session_id, .stdio)!
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response := decode_response(dispatch.response)!
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assert response.error.code == server_not_initialized.code
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}
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fn test_implementation_carries_2025_11_25_metadata_extensions() {
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icon := Icon{
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src: 'https://example.com/icon.svg'
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mime_type: 'image/svg+xml'
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sizes: ['48x48', '96x96']
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theme: 'light'
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}
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mut server := new_server(
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name: 's'
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version: '0'
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title: 'Server Title'
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description: 'Showcase'
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website_url: 'https://example.com'
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icons: [icon]
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)
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'ping', empty).encode(), stdio_session_id,
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.stdio)!
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// The server's Implementation is folded into the cached InitializeResult; round-trip
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// it through json.encode to verify the wire shape.
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encoded := json.encode(server.server_info)
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assert encoded.contains('"name":"s"')
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assert encoded.contains('"version":"0"')
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assert encoded.contains('"title":"Server Title"')
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assert encoded.contains('"description":"Showcase"')
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assert encoded.contains('"websiteUrl":"https://example.com"')
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assert encoded.contains('"icons":[')
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assert encoded.contains('"src":"https://example.com/icon.svg"')
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assert encoded.contains('"mimeType":"image/svg+xml"')
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assert encoded.contains('"sizes":["48x48","96x96"]')
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assert encoded.contains('"theme":"light"')
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assert dispatch.response.contains('"jsonrpc":"2.0"')
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}
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fn test_implementation_omits_optional_metadata_when_empty() {
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encoded := json.encode(Implementation{ name: 'c', version: '0' })
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assert encoded == '{"name":"c","version":"0"}'
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}
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fn test_tool_emits_icons_and_execution_task_support() {
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mut server := new_server(name: 's', version: '0')
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server.add_tool(Tool{
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name: 'launch'
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icons: [
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Icon{
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src: 'https://example.com/launch.png'
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mime_type: 'image/png'
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},
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]
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execution: ToolExecution{
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task_support: 'optional'
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}
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}, fn (_ Context, _ string) !ToolResult {
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return tool_text_result('ok')
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'tools/list', empty).encode(),
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert body.contains('"icons":[{"src":"https://example.com/launch.png","mimeType":"image/png"}]')
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assert body.contains('"execution":{"taskSupport":"optional"}')
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}
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fn test_tool_omits_icons_and_execution_when_unset() {
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mut server := new_server(name: 's', version: '0')
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server.add_tool(Tool{ name: 'plain' }, fn (_ Context, _ string) !ToolResult {
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return tool_text_result('ok')
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'tools/list', empty).encode(),
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert !body.contains('"icons"')
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assert !body.contains('"execution"')
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}
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fn test_resource_emits_icons_size_and_annotations() {
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mut server := new_server(name: 's', version: '0')
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server.add_resource(Resource{
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uri: 'res://big'
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name: 'big'
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size: 4096
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icons: [Icon{
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src: 'https://example.com/file.svg'
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}]
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annotations: Annotations{
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audience: ['user']
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priority: 0.8
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last_modified: '2026-04-29T00:00:00Z'
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}
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}, fn (_ Context, uri string) !ReadResourceResult {
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return ReadResourceResult{
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contents: [ResourceContents{
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uri: uri
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text: ''
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}]
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}
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'resources/list', empty).encode(),
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert body.contains('"size":4096')
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assert body.contains('"icons":[{"src":"https://example.com/file.svg"}]')
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assert body.contains('"audience":["user"]')
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assert body.contains('"priority":0.8')
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assert body.contains('"lastModified":"2026-04-29T00:00:00Z"')
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}
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fn test_resource_template_emits_icons_and_annotations() {
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mut server := new_server(name: 's', version: '0')
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server.add_resource_template(ResourceTemplate{
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uri_template: 'res://greet/{name}'
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name: 'greet'
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icons: [Icon{
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src: 'https://example.com/wave.svg'
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}]
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annotations: Annotations{
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audience: ['assistant']
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}
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'resources/templates/list', empty).encode(),
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert body.contains('"icons":[{"src":"https://example.com/wave.svg"}]')
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assert body.contains('"audience":["assistant"]')
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}
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fn test_prompt_emits_icons() {
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mut server := new_server(name: 's', version: '0')
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server.add_prompt(Prompt{
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name: 'review'
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icons: [Icon{
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src: 'https://example.com/review.svg'
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}]
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}, fn (_ Context, _ string) !GetPromptResult {
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return GetPromptResult{
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messages: [prompt_text_message('user', 'hi')]
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}
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})!
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build_initialized_session(mut server)
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dispatch := server.dispatch_message(new_request(2, 'prompts/list', empty).encode(),
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stdio_session_id, .stdio)!
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body := decode_response(dispatch.response)!.result
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assert body.contains('"icons":[{"src":"https://example.com/review.svg"}]')
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}
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fn test_content_helpers_match_spec_shapes() {
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assert text_content('hi') == '{"type":"text","text":"hi"}'
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assert image_content('AAA=', 'image/png') == '{"type":"image","data":"AAA=","mimeType":"image/png"}'
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assert audio_content('BBB=', 'audio/wav') == '{"type":"audio","data":"BBB=","mimeType":"audio/wav"}'
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assert embedded_text_resource('res://a', 'text/plain', 'hi') == '{"type":"resource","resource":{"uri":"res://a","mimeType":"text/plain","text":"hi"}}'
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assert embedded_blob_resource('res://b', 'image/png', 'AAA=') == '{"type":"resource","resource":{"uri":"res://b","mimeType":"image/png","blob":"AAA="}}'
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link := resource_link_content(Resource{ uri: 'res://l', name: 'l' })
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assert link.starts_with('{"type":"resource_link",')
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assert link.contains('"uri":"res://l"')
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assert link.contains('"name":"l"')
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}
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fn test_content_helpers_attach_annotations() {
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annot := Annotations{
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audience: ['user', 'assistant']
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priority: 0.7
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last_modified: '2026-04-29T00:00:00Z'
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}
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text := text_content_with_annotations('hi', annot)
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assert text.contains('"type":"text"')
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assert text.contains('"text":"hi"')
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assert text.contains('"annotations":{')
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assert text.contains('"audience":["user","assistant"]')
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assert text.contains('"priority":0.7')
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assert text.contains('"lastModified":"2026-04-29T00:00:00Z"')
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image := image_content_with_annotations('AAA=', 'image/png', annot)
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assert image.contains('"type":"image"')
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assert image.contains('"data":"AAA="')
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assert image.contains('"mimeType":"image/png"')
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assert image.contains('"annotations":{')
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audio := audio_content_with_annotations('BBB=', 'audio/wav', annot)
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assert audio.contains('"type":"audio"')
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assert audio.contains('"annotations":{')
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embedded := embedded_text_resource_with_annotations('res://x', 'text/plain', 'hi', annot)
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assert embedded.starts_with('{"type":"resource"')
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assert embedded.contains('"resource":{"uri":"res://x"')
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assert embedded.contains('"annotations":{')
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}
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fn test_progress_notifications_must_strictly_increase() {
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mut server := new_server(name: 's', version: '0')
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server.add_tool(Tool{ name: 'work' }, fn (ctx Context, _ string) !ToolResult {
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ctx.notify_progress(0.3, 1.0, 'a')
|
|
ctx.notify_progress(0.3, 1.0, 'b') // should be dropped (equal)
|
|
ctx.notify_progress(0.1, 1.0, 'c') // should be dropped (lower)
|
|
ctx.notify_progress(0.6, 1.0, 'd') // accepted
|
|
return tool_text_result('done')
|
|
})!
|
|
build_initialized_session(mut server)
|
|
|
|
server.dispatch_message('{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"work","arguments":{},"_meta":{"progressToken":"p1"}}}',
|
|
stdio_session_id, .stdio)!
|
|
queue := server.drain_session_notifications(stdio_session_id)
|
|
progress_notifications := queue.filter(it.contains('notifications/progress'))
|
|
assert progress_notifications.len == 2
|
|
assert progress_notifications[0].contains('"progress":0.3')
|
|
assert progress_notifications[1].contains('"progress":0.6')
|
|
}
|
|
|
|
fn test_completion_clamps_values_to_one_hundred() {
|
|
mut server := new_server(name: 's', version: '0')
|
|
server.add_completion(CompletionRef{ ref_type: 'ref/prompt', name: 'p' }, 'arg', fn (_ Context, _ string, _ string) !CompletionResult {
|
|
mut values := []string{cap: 150}
|
|
for i in 0 .. 150 {
|
|
values << 'item_${i}'
|
|
}
|
|
return CompletionResult{
|
|
values: values
|
|
}
|
|
})!
|
|
build_initialized_session(mut server)
|
|
|
|
dispatch := server.dispatch_message('{"jsonrpc":"2.0","id":2,"method":"completion/complete","params":{"ref":{"type":"ref/prompt","name":"p"},"argument":{"name":"arg","value":""}}}',
|
|
stdio_session_id, .stdio)!
|
|
body := decode_response(dispatch.response)!.result
|
|
assert body.contains('"hasMore":true')
|
|
// 100 commas inside the values array (one between every consecutive pair).
|
|
values_section := body.all_after('"values":[').all_before(']')
|
|
assert values_section.split(',').len == 100
|
|
assert values_section.contains('"item_99"')
|
|
assert !values_section.contains('"item_100"')
|
|
}
|
|
|
|
fn test_url_elicitation_emits_mode_url_and_elicitation_id() {
|
|
encoded := encode_elicit_params(ElicitParams{
|
|
mode: 'url'
|
|
message: 'Connect your GitHub account'
|
|
url: 'https://example.com/connect/abc'
|
|
elicitation_id: '550e8400-e29b-41d4-a716-446655440000'
|
|
})
|
|
assert encoded.contains('"mode":"url"')
|
|
assert encoded.contains('"message":"Connect your GitHub account"')
|
|
assert encoded.contains('"url":"https://example.com/connect/abc"')
|
|
assert encoded.contains('"elicitationId":"550e8400-e29b-41d4-a716-446655440000"')
|
|
assert !encoded.contains('"requestedSchema"')
|
|
}
|
|
|
|
fn test_form_elicitation_omits_url_fields() {
|
|
encoded := encode_elicit_params(ElicitParams{
|
|
message: 'Pick a color'
|
|
requested_schema: ElicitSchema{
|
|
properties: '{"color":{"type":"string"}}'
|
|
required: ['color']
|
|
}
|
|
})
|
|
assert encoded.contains('"message":"Pick a color"')
|
|
assert encoded.contains('"requestedSchema":{"type":"object","properties":{"color":{"type":"string"}},"required":["color"]}')
|
|
assert !encoded.contains('"mode"')
|
|
assert !encoded.contains('"url"')
|
|
assert !encoded.contains('"elicitationId"')
|
|
}
|
|
|
|
fn test_resources_read_returns_resource_not_found_with_uri() {
|
|
mut server := new_server(name: 's', version: '0')
|
|
build_initialized_session(mut server)
|
|
|
|
dispatch := server.dispatch_message(new_request(2, 'resources/read', ReadResourceParams{
|
|
uri: 'res://missing'
|
|
}).encode(), stdio_session_id, .stdio)!
|
|
assert dispatch.response.contains('"code":-32002')
|
|
assert dispatch.response.contains('"data":{"uri":"res://missing"}')
|
|
}
|
|
|
|
fn test_elicitation_completion_notification_has_id() {
|
|
mut server := new_server(name: 's', version: '0')
|
|
build_initialized_session(mut server)
|
|
|
|
server.notify_elicitation_complete(stdio_session_id, '550e8400-e29b-41d4-a716-446655440000')
|
|
queue := server.drain_session_notifications(stdio_session_id)
|
|
assert queue.len == 1
|
|
notif := decode_notification(queue[0])!
|
|
assert notif.method == 'notifications/elicitation/complete'
|
|
assert notif.params.contains('"elicitationId":"550e8400-e29b-41d4-a716-446655440000"')
|
|
}
|
|
|
|
fn test_url_elicitation_required_error_code_matches_spec() {
|
|
assert url_elicitation_required.code == -32042
|
|
}
|
|
|
|
fn test_sampling_create_message_carries_tools_and_tool_choice() {
|
|
encoded := json.encode(CreateMessageParams{
|
|
messages: [
|
|
SamplingMessage{
|
|
role: 'user'
|
|
content: text_content('hello')
|
|
},
|
|
]
|
|
max_tokens: 100
|
|
tools: [
|
|
Tool{
|
|
name: 'lookup'
|
|
input_schema: '{"type":"object","properties":{"q":{"type":"string"}}}'
|
|
},
|
|
]
|
|
tool_choice: ToolChoice{
|
|
mode: 'auto'
|
|
}
|
|
include_context: 'thisServer'
|
|
})
|
|
assert encoded.contains('"tools":[')
|
|
assert encoded.contains('"name":"lookup"')
|
|
assert encoded.contains('"toolChoice":{"mode":"auto"}')
|
|
assert encoded.contains('"includeContext":"thisServer"')
|
|
}
|