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The children stay ordinary cells with their own logs, checks,\n * results and scoring; the composite only routes each request:\n *\n * initialize, server/discover every child, capabilities merged\n * tools/list, resources/list, … every child, lists merged\n * tools/call, resources/read, prompts/get the child that listed the name\n * notifications every child\n * anything else, GET, DELETE the first child\n *\n * A composite's path segment is its children's names joined with `+`, e.g.\n * `/s//2026-07-28/tools_call+http-standard-headers/mcp`.\n */\n\nexport const COMPOSITE_SEPARATOR = '+';\n\n/** Children that cannot share a URL, and why. */\nconst NOT_COMPOSABLE: Record = {\n 'request-metadata':\n \"rejects the run's first request on purpose, which would fail the composite's first request\",\n 'http-invalid-tool-headers':\n 'serves malformed tools on purpose, and a strict client drops the whole merged tool list',\n 'sse-retry': 'owns every GET and its own session id',\n 'elicitation-sep1034-client-defaults':\n 'keeps SDK sessions keyed by a session id it mints itself'\n};\n\n/** Why `scenario` cannot be a child of a composite, or undefined when it can. */\nexport function notComposableReason(scenario: string): string | undefined {\n if (scenario.startsWith('auth/')) {\n return \"owns the endpoint's 401 and authorization metadata\";\n }\n return NOT_COMPOSABLE[scenario];\n}\n\n/**\n * The children named by a composite path segment, in order and without\n * repeats, or undefined when the segment is not a composite (no separator).\n */\nexport function parseComposite(segment: string): string[] | undefined {\n if (!segment.includes(COMPOSITE_SEPARATOR)) return undefined;\n const names = segment.split(COMPOSITE_SEPARATOR).filter(Boolean);\n return [...new Set(names)];\n}\n\n/** Ready-made composites the run page offers, per revision. */\nexport const DEFAULT_COMPOSITES: Record = {\n '2025-11-25': ['initialize', 'tools_call'],\n '2026-07-28': [\n 'tools_call',\n 'http-standard-headers',\n 'http-custom-headers',\n 'json-schema-ref-no-deref',\n 'sep-2322-client-request-state'\n ]\n};\n\n/** List methods: the result key holding the list, and the key naming an item. */\nconst LISTS: Record = {\n 'tools/list': { key: 'tools', id: 'name' },\n 'prompts/list': { key: 'prompts', id: 'name' },\n 'resources/list': { key: 'resources', id: 'uri' },\n 'resources/templates/list': { key: 'resourceTemplates', id: 'uriTemplate' }\n};\n\n/** Requests addressed to one named item: the param naming it, and its list. */\nconst ADDRESSED: Record = {\n 'tools/call': { param: 'name', list: 'tools/list' },\n 'prompts/get': { param: 'name', list: 'prompts/list' },\n 'resources/read': { param: 'uri', list: 'resources/list' }\n};\n\nconst LIFECYCLE = new Set(['initialize', 'server/discover']);\n\nexport type Route =\n | { kind: 'lifecycle' }\n | { kind: 'list'; method: string }\n | { kind: 'addressed'; list: string; item: string }\n | { kind: 'notification' }\n | { kind: 'first' };\n\nfunction asRecord(v: unknown): Record | undefined {\n return typeof v === 'object' && v !== null && !Array.isArray(v)\n ? (v as Record)\n : undefined;\n}\n\n/** Where one JSON-RPC message goes (see the table at the top of the file). */\nexport function routeFor(message: Record | undefined): Route {\n const method = typeof message?.method === 'string' ? message.method : '';\n if (!method) return { kind: 'first' };\n if (message?.id === undefined) return { kind: 'notification' };\n if (LIFECYCLE.has(method)) return { kind: 'lifecycle' };\n if (LISTS[method]) return { kind: 'list', method };\n const addressed = ADDRESSED[method];\n const item = asRecord(message?.params)?.[addressed?.param ?? 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