feat(mcp): kbdb_graph_neighbors — graph 鄰居查詢薄殼(#68)
MCP 面補齊 D17 KBDB RAG 套餐第三模式(關鍵字/語義/圖):
- 新 tool kbdb_graph_neighbors:subject(必填)/depth(預設 1)/kbdb_base/
template(預設 graph_triplet)/directed,形狀對齊
registry/examples/graph-neighbors/workflow.yaml 的 input
- 薄殼調 GET /q/{orgNamespace}/graph_neighbors 同步查詢端點(#28 地基),
走既有 CYPHER_EXECUTOR service binding,不新增 binding、不碰 D1、
不動 workflow 引擎本體
- workflow 未部署 → 404 誠實回 workflow_not_installed +安裝指引,不 crash;
HTTP 200 但 workflow 層 success:false 也不假綠
- graph_traverse 不加:repo 內無該 workflow 定義可對齊 input 形狀,不猜
- 測試:tests/unit/tools/kbdb-graph.test.ts(7 測,全綠);tsc --noEmit 乾淨;
mcp 全套 vitest 59/59 綠
merge 後需 gated redeploy arcrun-mcp(leo 閘)。
關聯 #68
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JUmjwkHLVBHM3ydhT1WSW3
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/**
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* KBDB graph 查詢 MCP 薄殼(issue #68,D17 KBDB MCP 面)
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*
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* rule 07 §5(薄殼鐵律):能力長在 workflow(graph_neighbors,registry/examples/graph-neighbors),
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* MCP 只做介面轉換 + 暴露,無業務邏輯——不碰 D1、不動 workflow 引擎本體。
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*
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* D17「KBDB MCP=RAG 套餐」三模式:關鍵字(kbdb_search keyword)/語義(kbdb_search semantic)
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* /圖(本檔)。本檔補上 MCP 面缺的第三模式:關係遍歷(1-hop/N-hop 鄰居)。
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*
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* 走 #28 地基的同步查詢端點(cypher-executor webhooks-named.ts):
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* GET /q/:ns/:name — 同步執行 workflow,直接回「最終節點輸出」本身(200 直出,非 202、非信封)。
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* 本工具打 GET /q/{orgNamespace}/graph_neighbors(經既有 CYPHER_EXECUTOR service binding,
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* 不新增 binding),namespace 用 MCP token 解析出的 orgNamespace(與 whoami 同源)。
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*
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* workflow 未部署(用戶沒裝 graph_neighbors)→ 404 → 誠實回錯誤+怎麼裝,不 crash(鐵律)。
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*
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* graph_neighbors workflow 的 input 形狀(registry/examples/graph-neighbors/workflow.yaml):
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* node(起點)、depth(預設 1)、template(triplet template 名)、namespace(owner_id)、
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* kbdb_base(呼叫者自己的 KBDB 對外 URL——workflow 刻意不寫死任何一家的庫)、directed。
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*/
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import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
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import { z } from "zod";
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import type { Env } from "../types.js";
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import { cypherFetch, errorResponse, successResponse } from "../lib/cypher-client.js";
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/** graph 查詢 workflow 名(與 registry/examples/graph-neighbors/workflow.yaml 的 name 一致)。 */
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export const GRAPH_NEIGHBORS_WORKFLOW = "graph_neighbors";
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/** 未裝 workflow 時的安裝指引(404 與內層錯誤共用,訊息一致)。 */
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const INSTALL_HINTS = [
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`graph 查詢由「${GRAPH_NEIGHBORS_WORKFLOW}」workflow 承載(薄殼設計,MCP 本身不算圖)`,
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"安裝:拿 registry/examples/graph-neighbors/workflow.yaml,call arcrun_push_workflow 部署(name 必須是 graph_neighbors)",
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"或用 CLI:acr push registry/examples/graph-neighbors/workflow.yaml",
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];
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/** 註冊全部 KBDB graph 查詢工具(issue #68)。 */
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export function registerAllKbdbGraphTools(server: McpServer, env: Env, orgNamespace: string) {
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registerGraphNeighbors(server, env, orgNamespace);
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// graph_traverse:repo 內目前只有 graph-neighbors 有 workflow 定義(registry/examples/),
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// traverse 尚無可對齊的 input 形狀 → 不猜、不過度工程;等 workflow 進 registry 再加薄殼。
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}
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/**
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* kbdb_graph_neighbors — knowledge graph 1-hop/N-hop 鄰居查詢。
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* 薄殼調 GET /q/{ns}/graph_neighbors,結果(最終節點輸出)原樣回給 MCP client。
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*/
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export function registerGraphNeighbors(server: McpServer, env: Env, orgNamespace: string) {
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server.tool(
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"kbdb_graph_neighbors",
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"knowledge graph 鄰居查詢(1-hop/N-hop 關係遍歷):給一個節點名,沿 KBDB triplet" +
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"(subject-predicate-object)記錄做 BFS,回傳 depth 跳內的鄰居清單" +
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"([{node, predicate, from, depth}])。與 kbdb_search(關鍵字/語義)互補:" +
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"找「跟 X 有關係的東西」用本工具,找「內容含關鍵字的東西」用 kbdb_search。" +
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"需要 namespace 裡已部署 graph_neighbors workflow(沒裝會回安裝指引,不會 crash)。",
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{
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subject: z.string().min(1).describe(
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"起點節點名(graph triplet 的 subject/object 值),如 'Arcrun'",
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),
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depth: z.number().int().min(1).max(10).optional().describe(
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"最大跳數(N-hop),預設 1(只看直接鄰居)",
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),
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kbdb_base: z.string().min(1).describe(
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"你自己部署的 KBDB 對外 base URL(如 https://arcrun-kbdb.<你的subdomain>.workers.dev " +
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"或 KBDB custom domain)。workflow 刻意不寫死任何一家的庫——" +
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"帶錯(或照抄別人的值)=查詢打進別人的庫",
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),
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template: z.string().optional().describe(
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"triplet 記錄的 template 名,預設 'graph_triplet'(以實際部署的 kbdb-graph-plugin " +
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"triplet template 為準,不確定可 kbdb_list_templates 查)",
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),
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directed: z.boolean().optional().describe(
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"true=只走 subject→object 有向邊;預設 false(把 triplet 當雙向邊,無向鄰居)",
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),
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},
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async ({ subject, depth, kbdb_base, template, directed }) => {
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if (!orgNamespace) {
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return errorResponse(
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"no_namespace",
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"此 MCP 連線沒有解析出 namespace,無法定位 graph workflow",
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["call arcrun_whoami 確認身份", "確認 MCP token / OAuth 設定正確"],
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);
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}
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try {
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// input 形狀對齊 graph_neighbors workflow(node/depth/template/namespace/kbdb_base/directed)。
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const query: Record<string, string | number> = {
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node: subject,
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depth: depth ?? 1,
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template: template ?? "graph_triplet",
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namespace: orgNamespace,
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kbdb_base,
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};
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if (directed) query.directed = "true";
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// /q/:ns/:name:namespace 走 path(cypher opaque-key 模型,orgNamespace 即分區 key),
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// 走既有 CYPHER_EXECUTOR service binding(cypherFetch),不新增 binding。
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const res = await cypherFetch(
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env,
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`/q/${encodeURIComponent(orgNamespace)}/${GRAPH_NEIGHBORS_WORKFLOW}`,
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{ apiKey: orgNamespace, query },
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);
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if (res.status === 404) {
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// workflow 沒裝 → 誠實 + 給安裝路徑(鐵律:不 crash、不假綠)。
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return errorResponse(
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"workflow_not_installed",
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`namespace「${orgNamespace}」尚未部署 ${GRAPH_NEIGHBORS_WORKFLOW} workflow,graph 查詢無法使用`,
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INSTALL_HINTS,
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);
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}
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const bodyText = await res.text();
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let data: unknown = null;
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try {
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data = bodyText ? JSON.parse(bodyText) : null;
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} catch {
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data = bodyText;
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}
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if (!res.ok) {
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// 409=paused(無法同步查詢)、413=輸出過大、500=執行失敗,端點都回 {error,...}。
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const err = (data ?? {}) as { error?: string };
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return errorResponse(
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"graph_query_failed",
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`graph 查詢失敗 HTTP ${res.status}: ${err.error ?? "unknown"}`,
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[
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"確認 kbdb_base 是你自己 KBDB 的對外 URL 且可被 cypher-executor fetch(1042 陷阱:優先 custom domain)",
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"確認 template 名對得上實際 triplet template(kbdb_list_templates)",
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"call arcrun_list_recent_executions('graph_neighbors') 看 trace",
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],
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typeof data === "string" ? data : JSON.stringify(data),
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);
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}
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// 200 = workflow 跑完,body 即最終節點輸出本身。但 workflow 內部仍可能回
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// { success:false, error }(如缺參數)——不把它假裝成成功結果。
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const out = data as { success?: boolean; error?: string; count?: number } | null;
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if (out && typeof out === "object" && out.success === false) {
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return errorResponse(
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"graph_query_failed",
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out.error ?? "graph_neighbors workflow 回報失敗",
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["確認 subject 非空", "確認參數形狀(depth 為正整數)"],
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JSON.stringify(out),
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);
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}
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// 原樣回給 MCP client(薄殼:不加工、不重排)。
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return successResponse(out, [
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`${out?.count ?? 0} 個鄰居(depth 上限 ${depth ?? 1})`,
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"count=0 且不確定資料有沒有進圖:kbdb_query(template='graph_triplet') 看 triplet 記錄",
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"找關鍵字內容改用 kbdb_search;取單筆全文用 kbdb_get_record",
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]);
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} catch (e) {
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return errorResponse("internal_error", e instanceof Error ? e.message : String(e), ["稍後重試"]);
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}
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},
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);
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}
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@@ -18,6 +18,7 @@ import { registerAllWorkflowCrudTools } from "./arcrun_workflow_crud.js";
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import { registerAllSkillExampleTools } from "./arcrun_skills_examples.js";
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import { registerAllRecipeTools } from "./arcrun_recipe.js";
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import { registerAllKbdbDataTools } from "./kbdb_data.js";
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import { registerAllKbdbGraphTools } from "./kbdb_graph.js";
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import { registerWhoami } from "./arcrun_whoami.js";
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export function registerAllTools(server: McpServer, env: Env, orgNamespace: string, partnerToken: string) {
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@@ -49,6 +50,9 @@ export function registerAllTools(server: McpServer, env: Env, orgNamespace: stri
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// kbdb-base Phase 9.1: KBDB 資料層薄殼(template/record/query/search,HANDOFF §2)
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// 鐵律:不提供建表/SQL tool,AI 只有 template+slot 可用(類 Supabase 萬用表)
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registerAllKbdbDataTools(server, env);
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// issue #68: KBDB graph 查詢薄殼(kbdb_graph_neighbors,調 /q/:ns/graph_neighbors 同步查詢端點)
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// 補齊 D17「KBDB MCP=RAG 套餐」第三模式:關鍵字/語義之外的圖(關係遍歷)
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registerAllKbdbGraphTools(server, env, orgNamespace);
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// §7.8 P1 D2: whoami(與 CLI acr whoami 對齊,AI 不繞 CLI 自己 curl 猜帳號)
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registerWhoami(server, env, orgNamespace);
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}
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