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Scenarios exercising these SEPs MUST\n * build their requests through these helpers so a strictly-conformant server\n * never rejects harness traffic for reasons unrelated to the behaviour under\n * test (issues #311, #312, #315).\n */\n\nimport { DRAFT_PROTOCOL_VERSION } from '../../types.ts';\n\nexport interface JsonRpcResponse {\n jsonrpc: '2.0';\n id: number | string | null;\n result?: Record;\n error?: { code: number; message: string; data?: unknown };\n}\n\nexport const CONFORMANCE_CLIENT_INFO = {\n name: 'conformance-test-client',\n version: '1.0.0'\n} as const;\n\nexport const DEFAULT_CLIENT_CAPABILITIES = {\n sampling: {},\n elicitation: {},\n roots: { listChanged: true }\n} as const;\n\nexport interface StatelessResponse {\n status: number;\n headers: Headers;\n contentType?: string;\n /** The parsed JSON-RPC message (for SSE: the event matching the request id). */\n body?: JsonRpcResponse;\n /** All parsed events when the response was an SSE / chunked stream. */\n events?: unknown[];\n /** Raw response text when it could not be parsed as JSON. */\n text?: string;\n}\n\nlet nextRequestId = 1;\n\n/**\n * The `Mcp-Name` source field per SEP-2243: `params.name` for tools/call and\n * prompts/get, `params.uri` for resources/read; absent otherwise.\n */\nexport function mcpNameForRequest(\n method: string,\n params?: Record\n): string | undefined {\n if (method === 'tools/call' || method === 'prompts/get') {\n return typeof params?.name === 'string' ? params.name : undefined;\n }\n if (method === 'resources/read') {\n return typeof params?.uri === 'string' ? params.uri : undefined;\n }\n return undefined;\n}\n\n/**\n * Build the conformant header set for a stateless request: Content-Type,\n * Accept (both content types), MCP-Protocol-Version, Mcp-Method and (when the\n * method carries one) Mcp-Name. `options.headers` overrides or extends the\n * defaults, replacing any default whose name matches case-insensitively.\n */\nexport function buildStandardHeaders(\n method: string,\n params?: Record,\n options: { headers?: Record } = {}\n): Record {\n const headers: Record = {\n 'Content-Type': 'application/json',\n Accept: 'application/json, text/event-stream',\n 'MCP-Protocol-Version': DRAFT_PROTOCOL_VERSION,\n 'Mcp-Method': method\n };\n const name = mcpNameForRequest(method, params);\n if (name !== undefined) {\n headers['Mcp-Name'] = name;\n }\n\n if (options.headers) {\n for (const [key, value] of Object.entries(options.headers)) {\n // Replace any default that differs only by case, then set the override.\n for (const existing of Object.keys(headers)) {\n if (existing.toLowerCase() === key.toLowerCase()) {\n delete headers[existing];\n }\n }\n headers[key] = value;\n }\n }\n\n return headers;\n}\n\n/**\n * Merge params with the conformant `_meta` required on every stateless\n * request. Keys already present in `params._meta` win over the defaults.\n */\nexport function withRequestMeta(\n params?: Record\n): Record {\n return {\n ...params,\n _meta: {\n 'io.modelcontextprotocol/protocolVersion': DRAFT_PROTOCOL_VERSION,\n 'io.modelcontextprotocol/clientInfo': CONFORMANCE_CLIENT_INFO,\n 'io.modelcontextprotocol/clientCapabilities': DEFAULT_CLIENT_CAPABILITIES,\n ...(params?._meta as Record | undefined)\n }\n };\n}\n\nfunction isJsonRpcResponseShaped(event: unknown): event is JsonRpcResponse {\n return (\n typeof event === 'object' &&\n event !== null &&\n ('result' in event || 'error' in event)\n );\n}\n\nfunction parseSseLineInto(events: unknown[], rawLine: string): void {\n const line = rawLine.trim();\n if (!line) return;\n const jsonText = line.startsWith('data:')\n ? line.replace(/^data:\\s*/, '')\n : line;\n try {\n events.push(JSON.parse(jsonText));\n } catch {\n // Non-JSON line (comments, partial frames) — ignore.\n }\n}\n\n/**\n * Read an SSE / chunked-stream response incrementally and resolve as soon as\n * the JSON-RPC response matching `requestId` arrives, without waiting for the\n * stream to close. If the stream ends (or is aborted) first, returns whatever\n * events were parsed, with `body` set to the last response-shaped event.\n */\nexport async function readSseJsonRpcResponse(\n res: Response,\n requestId: number | string | null\n): Promise<{ events: unknown[]; body?: JsonRpcResponse }> {\n const events: unknown[] = [];\n const matchesRequest = (event: unknown): event is JsonRpcResponse =>\n isJsonRpcResponseShaped(event) && event.id === requestId;\n const finish = (): { events: unknown[]; body?: JsonRpcResponse } => {\n const match = events.find(matchesRequest);\n const lastResponseShaped = [...events]\n .reverse()\n .find(isJsonRpcResponseShaped);\n return { events, body: match ?? lastResponseShaped };\n };\n\n if (!res.body) return finish();\n\n const reader = res.body.getReader();\n const decoder = new TextDecoder();\n let buffer = '';\n\n try {\n for (;;) {\n let value: Uint8Array | undefined;\n let done = false;\n try {\n ({ value, done } = await reader.read());\n } catch {\n // The stream was aborted (timeout) or dropped — return what arrived.\n break;\n }\n\n if (value) {\n buffer += decoder.decode(value, { stream: true });\n const lines = buffer.split(/\\r?\\n/);\n buffer = lines.pop() ?? 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