commit 65c69f5666aae3cb63069b2b2fa38f4899339c9d
Author: thug0bin <thug0bin@gmail.com>
Date:   Mon Mar 2 01:51:24 2026 +0900

    🤖 센드빌(Sendbill) MCP 서버 초기 구현
    
    - 전자세금계산서 API 전체 커버 (29개 툴)
    - 인증서 관리, 계산서 발행(단건/묶음/대량), 상태조회, 회원관리
    - 홈택스 연동 (세금계산서/현금영수증 일별/월별 매출/매입)
    - 휴폐업 조회, 추가메일 전송
    - 에러코드표 내장 (Excel 기반)
    - 코드표 참조 툴 (billtype, taxrate, billstat 등)
    - 인증: SENDBILL_SBKEY 환경변수
    
    Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9a096d8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
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diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..ea064a7
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1082 @@
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..468273a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "sendbill-mcp",
+  "version": "1.0.0",
+  "description": "센드빌 전자세금계산서 API MCP 서버",
+  "type": "module",
+  "bin": {
+    "sendbill-mcp": "./dist/index.js"
+  },
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "start": "node dist/index.js"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0",
+    "@types/node": "^20.0.0"
+  }
+}
diff --git a/src/client.ts b/src/client.ts
new file mode 100644
index 0000000..1a8e068
--- /dev/null
+++ b/src/client.ts
@@ -0,0 +1,46 @@
+// 센드빌 API HTTP 클라이언트
+
+const BASE_URL = "https://api.sendbill.co.kr";
+
+export class SendbillClient {
+  private sbkey: string;
+
+  constructor(sbkey: string) {
+    this.sbkey = sbkey;
+  }
+
+  async post(endpoint: string, body: Record<string, unknown>): Promise<unknown> {
+    const url = `${BASE_URL}${endpoint}`;
+    const response = await fetch(url, {
+      method: "POST",
+      headers: {
+        "SBKEY": this.sbkey,
+        "Content-Type": "application/json; charset=UTF-8",
+        "Accept-Charset": "UTF-8",
+      },
+      body: JSON.stringify(body),
+    });
+
+    if (!response.ok) {
+      throw new Error(`HTTP 오류: ${response.status} ${response.statusText}`);
+    }
+
+    const text = await response.text();
+    try {
+      return JSON.parse(text);
+    } catch {
+      return { raw: text };
+    }
+  }
+}
+
+export function createClient(): SendbillClient {
+  const sbkey = process.env.SENDBILL_SBKEY;
+  if (!sbkey) {
+    throw new Error(
+      "SENDBILL_SBKEY 환경변수가 설정되지 않았습니다.\n" +
+      "사용법: SENDBILL_SBKEY=your-key npx sendbill-mcp"
+    );
+  }
+  return new SendbillClient(sbkey);
+}
diff --git a/src/error-codes.ts b/src/error-codes.ts
new file mode 100644
index 0000000..ed13057
--- /dev/null
+++ b/src/error-codes.ts
@@ -0,0 +1,148 @@
+// 센드빌 API 에러코드 참조표
+// 출처: https://www.sendbill.co.kr/SendbillAPI_Error_Code.xls
+
+export const ERROR_CODES: Record<string, string> = {
+  // SBKEY 관련
+  "-10001": "SBKEY Header 데이터가 없습니다.",
+  "-10002": "SBKEY의 데이터가 옳바르지 않습니다.",
+  "-10003": "폐기 처리된 SBKEY 입니다.",
+  "-10004": "SBKEY의 사용 기간이 만료되었습니다.",
+
+  // 인증서 관련
+  "-11001": "실패",
+  "-11002": "등록된 인증서가 없습니다.",
+  "-11003": "기타오류, 고객센터로 문의 바랍니다.",
+  "-11004": "파일 업로드 중 오류가 발생하였습니다.",
+  "-11101": "올바른 파일을 선택해 주세요.",
+  "-11102": "[venderno] 필수 항목입니다.",
+  "-11103": "[venderno] 최대 길이는 10 bytes 입니다.",
+  "-11104": "[venderno] 숫자만 입력 가능합니다.",
+  "-11105": "[venderno] 올바른 형태의 사업자번호가 아닙니다.",
+  "-11106": "[password] 필수 항목입니다.",
+  "-11107": "[certderfile] 필수 항목입니다.",
+  "-11108": "[certkeyfile] 필수 항목입니다.",
+  "-11401": "등록된 인증서의 발급 정보와 사업자 번호가 일치하지 않습니다.",
+  "-11402": "인증서의 발급 정보와 인증서 비밀번호가 일치하지 않습니다.",
+  "-11403": "인증서의 사용기간이 만료되었습니다.",
+  "-11509": "등록된 인증서의 데이터가 옳바르지 않습니다. 인증서 신규 등록 후 다시 시도해주세요.",
+  "-11701": "URL 유효 시간이 만료되었습니다.",
+  "-11702": "token 오류, token 재발행 후 재시도해주세요.",
+  "-11703": "올바르지 않은 토큰입니다.",
+
+  // 계산서 발행 관련
+  "-12001": "실패",
+  "-12002": "조회된 데이터가 없습니다.",
+  "-12003": "기타오류, 고객센터로 문의 바랍니다.",
+  "-66666": "/api/agent/document/registDirect 긴급점검중 입니다.",
+  "-12501": "충전된 요금이 부족합니다.",
+  "-12502": "우대권 잔여 건 수 및 충전된 요금이 부족합니다.",
+  "-12503": "[대납] 충전된 요금이 부족합니다.",
+  "-12504": "[대납] 우대권 잔여 건 수 및 충전된 요금이 부족합니다.",
+  "-12631": "[A] 공급자 사업자번호에 해당하는 회원 ID가 없습니다.",
+  "-12633": "[A] 공급받는자 사업자번호에 해당하는 회원 ID가 없습니다.",
+  "-12641": "[A] 관리자가 마감하여 전송할 수 없습니다.",
+  "-12651": "[A] 품목의 합계 금액이 총 금액과 맞지 않습니다.",
+  "-12654": "[A] 과세기간(반기)이 지난 세금계산서는 발행이 불가능 합니다.",
+  "-12701": "발행자의 인증서가 등록되어 있지 않습니다.",
+  "-12703": "발행자의 등록된 인증서 사용기간이 만료되었습니다.",
+  "-12101": "[Billseq] 데이터가 중복되었습니다.",
+  "-12102": "[Item(Array)] 필수 항목입니다.",
+
+  // 회원 등록 관련
+  "-13001": "실패",
+  "-13002": "조회된 데이터가 없습니다.",
+  "-13003": "기타오류, 고객센터로 문의 바랍니다.",
+  "-13101": "이미 등록된 아이디 입니다.",
+
+  // 계산서 관리 관련
+  "-14001": "실패",
+  "-14002": "조회된 데이터가 없습니다.",
+  "-14003": "기타오류, 고객센터로 문의 바랍니다.",
+  "-14101": "[Orderseq] 데이터 중복 입니다.",
+  "-14102": "[Billseq] 필수 항목 입니다.",
+  "-14104": "[cmd_div] 필수 항목 입니다.",
+  "-14110": "[cmd_div] 올바른 코드 값을 입력 해주세요. [ 6, E ]",
+
+  // 계산서 상태조회 관련
+  "-15001": "실패",
+  "-15002": "조회된 데이터가 없습니다.",
+  "-15101": "[Billseq] 필수 항목 입니다.",
+
+  // 홈택스 연동 관련
+  "-18001": "실패",
+  "-18002": "조회된 데이터가 없습니다.",
+  "-18004": "홈택스에서 조회된 데이터가 없습니다.",
+  "-18101": "요청 사업자번호의 인증서가 등록되어 있지 않습니다.",
+  "-18403": "센드빌에 등록된 홈택스 계정 또는 인증서 정보가 없습니다.",
+  "-18401": "홈택스연동 사용 사업자가 아닙니다. 고객센터에 문의 바랍니다.",
+};
+
+export function getErrorMessage(code: number | string): string {
+  const key = String(Math.round(Number(code)));
+  return ERROR_CODES[key] ?? `알 수 없는 오류 코드: ${code}`;
+}
+
+// 코드표
+export const CODE_TABLES = {
+  billtype: {
+    "10": "세금계산서",
+    "11": "비회원 세금계산서",
+    "20": "(면세)계산서",
+    "21": "비회원(면세)계산서",
+    "30": "거래명세서",
+    "31": "비회원 거래명세서",
+    "40": "위수탁 세금계산서",
+    "41": "비회원 위수탁 세금계산서",
+    "50": "위수탁 (면세)계산서",
+    "51": "비회원 위수탁 (면세)계산서",
+    "61": "개인 매출 세금계산서",
+    "62": "개인 매출 계산서",
+    "Y1": "외부 매출 세금계산서",
+    "Z1": "외부 매입 세금계산서",
+  },
+  cmd_div: {
+    "6": "삭제요청",
+    "E": "EMAIL 전송",
+  },
+  taxrate: {
+    "0": "과세율",
+    "1": "영세율",
+    "2": "면세율",
+    "3": "매입세액불공제",
+    "4": "의제매입",
+  },
+  report_stat: {
+    "N": "미신고",
+    "A": "접수대기",
+    "B": "접수완료",
+    "R": "신고상태",
+    "F": "신고실패",
+  },
+  report_amend_cd: {
+    "1": "기재사항 착오/정정",
+    "2": "공급가액 변동",
+    "3": "환입",
+    "4": "계약의 해제",
+    "5": "내국신용장 사후 개설",
+    "6": "착오에 의한 이중발행",
+  },
+  billstat: {
+    "5": "미전송",
+    "0": "미개봉",
+    "3": "개봉",
+    "1": "승인",
+    "2": "반려",
+    "4": "승인취소",
+    "9": "종이문서저장",
+    "6": "삭제",
+  },
+  gubun: {
+    "1": "영수",
+    "2": "청구",
+  },
+  etc01: {
+    "S": "SENDID: 센드빌 ID / RECVID: 센드빌 ID",
+    "I": "SENDID: 센드빌 ID / RECVID: 거래처 ID",
+    "X": "SENDID: 거래처 ID / RECVID: 거래처 ID",
+  },
+};
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..ea57530
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,772 @@
+#!/usr/bin/env node
+/**
+ * 센드빌(Sendbill) MCP 서버
+ * 전자세금계산서 API 연동을 위한 Model Context Protocol 서버
+ *
+ * Base URL: https://api.sendbill.co.kr
+ * 인증: SBKEY 헤더 (환경변수 SENDBILL_SBKEY)
+ *
+ * 지원 기능:
+ * - 인증서 관리 (토큰, 등록, 조회, 삭제)
+ * - 계산서(세금) 발행 (단건/묶음/대량)
+ * - 계산서 상태조회 및 관리
+ * - 회원 등록 관리
+ * - 홈택스 연동 (세금계산서/현금영수증 조회)
+ * - 휴폐업 조회
+ * - 추가메일 전송
+ */
+
+import { Server } from "@modelcontextprotocol/sdk/server/index.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import {
+  CallToolRequestSchema,
+  ListToolsRequestSchema,
+} from "@modelcontextprotocol/sdk/types.js";
+import { createClient } from "./client.js";
+import { getErrorMessage, CODE_TABLES } from "./error-codes.js";
+
+const server = new Server(
+  { name: "sendbill-mcp", version: "1.0.0" },
+  { capabilities: { tools: {} } }
+);
+
+// ─────────────────────────────────────────────
+// 툴 목록 정의
+// ─────────────────────────────────────────────
+server.setRequestHandler(ListToolsRequestSchema, async () => ({
+  tools: [
+    // ── 인증서 관리 ──────────────────────────
+    {
+      name: "sendbill_get_token",
+      description:
+        "인증서 등록에 사용할 휘발성 토큰을 생성합니다. (유효시간: 5분)\n" +
+        "POST /api/agent/certificate/gettoken",
+      inputSchema: {
+        type: "object",
+        properties: {
+          venderno: {
+            type: "string",
+            description: "센드빌 회원사 사업자번호 (하이픈 제외 10자리)",
+          },
+        },
+        required: ["venderno"],
+      },
+    },
+    {
+      name: "sendbill_upload_cert",
+      description:
+        "계산서 발행을 위해 공인인증서를 센드빌에 등록합니다.\n" +
+        "POST /api/agent/certificate/uploadcert\n" +
+        "certderfile, certkeyfile은 각각 signCert.der, signPri.key 파일을 Base64 인코딩한 값입니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          jwt: { type: "string", description: "sendbill_get_token으로 발급받은 토큰" },
+          password: { type: "string", description: "인증서 비밀번호" },
+          certderfile: { type: "string", description: "signCert.der 파일 Base64 인코딩값" },
+          certkeyfile: { type: "string", description: "signPri.key 파일 Base64 인코딩값" },
+        },
+        required: ["jwt", "password", "certderfile", "certkeyfile"],
+      },
+    },
+    {
+      name: "sendbill_inquire_cert",
+      description:
+        "센드빌에 등록된 인증서의 만료일자를 조회합니다.\n" +
+        "POST /api/agent/certificate/inquirecert",
+      inputSchema: {
+        type: "object",
+        properties: {
+          jwt: { type: "string", description: "sendbill_get_token으로 발급받은 토큰" },
+        },
+        required: ["jwt"],
+      },
+    },
+    {
+      name: "sendbill_delete_cert",
+      description:
+        "센드빌에 등록된 인증서를 삭제합니다.\n" +
+        "POST /api/agent/certificate/deletecert",
+      inputSchema: {
+        type: "object",
+        properties: {
+          jwt: { type: "string", description: "sendbill_get_token으로 발급받은 토큰" },
+          password: { type: "string", description: "등록된 인증서 비밀번호" },
+        },
+        required: ["jwt", "password"],
+      },
+    },
+    {
+      name: "sendbill_get_cert_upload_view",
+      description:
+        "타사가 직접 인증서를 등록할 수 있는 폼 URL을 생성합니다. (유효시간: 5분)\n" +
+        "POST /api/agent/certificate/getuploadview",
+      inputSchema: {
+        type: "object",
+        properties: {
+          venderno: { type: "string", description: "사업자번호 (하이픈 제외 10자리)" },
+        },
+        required: ["venderno"],
+      },
+    },
+
+    // ── 계산서 발행 ──────────────────────────
+    {
+      name: "sendbill_register_invoice",
+      description:
+        "전자세금계산서(또는 계산서)를 단건 발행합니다.\n" +
+        "POST /api/agent/document/registDirect\n" +
+        "billtype 코드: 10=세금계산서, 20=(면세)계산서, 30=거래명세서, 40=위수탁세금계산서 등\n" +
+        "gubun: 1=영수, 2=청구\n" +
+        "taxrate: 0=과세, 1=영세, 2=면세",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseq: { type: "string", description: "세금계산서 고유번호 (최대 25자, 중복불가)" },
+          svenderno: { type: "string", description: "공급자 사업자번호 (하이픈 제외 10자리)" },
+          rvenderno: { type: "string", description: "공급받는자 사업자번호 또는 주민등록번호 (13자리 이내)" },
+          dt: { type: "string", description: "작성일 (YYYY-MM-DD, 미래일자 불가)" },
+          supmoney: { type: "string", description: "공급가액 총액 (숫자, 최대 13자리)" },
+          taxmoney: { type: "string", description: "세액 총액 (숫자, 최대 13자리)" },
+          billtype: { type: "string", description: "계산서 종류 코드 (10/11/20/21/30/31/40/41/50/51/61/62/Y1/Z1)" },
+          gubun: { type: "string", description: "청구구분 (1=영수, 2=청구)" },
+          taxrate: { type: "string", description: "과세구분 (0=과세, 1=영세, 2=면세, 3=매입세액불공제, 4=의제매입)" },
+          scompany: { type: "string", description: "공급자 업체명" },
+          sceoname: { type: "string", description: "공급자 대표자명" },
+          suptae: { type: "string", description: "공급자 업태" },
+          supjong: { type: "string", description: "공급자 업종" },
+          saddress: { type: "string", description: "공급자 주소" },
+          suser: { type: "string", description: "공급자 담당자명" },
+          stelno: { type: "string", description: "공급자 전화번호 (000-0000-0000)" },
+          semail: { type: "string", description: "공급자 이메일" },
+          rcompany: { type: "string", description: "공급받는자 업체명" },
+          rceoname: { type: "string", description: "공급받는자 대표자명" },
+          ruptae: { type: "string", description: "공급받는자 업태" },
+          rupjong: { type: "string", description: "공급받는자 업종" },
+          raddress: { type: "string", description: "공급받는자 주소" },
+          ruser: { type: "string", description: "공급받는자 담당자명" },
+          rtelno: { type: "string", description: "공급받는자 전화번호" },
+          remail: { type: "string", description: "공급받는자 이메일" },
+          report_except_yn: { type: "string", description: "신고 제외 여부 (Y/N, 기본값 N)" },
+          reverseyn: { type: "string", description: "역발행 여부 (Y/N, 기본값 N)" },
+          transyn: { type: "string", description: "전송 여부 (Y/N, 기본값 N)" },
+          test_yn: { type: "string", description: "테스트 여부 (Y/N, 기본값 N)" },
+          bigo: { type: "string", description: "비고 (최대 150자)" },
+          cash: { type: "string", description: "현금 지급액" },
+          checks: { type: "string", description: "수표 지급액" },
+          note: { type: "string", description: "어음 지급액" },
+          credit: { type: "string", description: "외상미수금" },
+          sendid: { type: "string", description: "공급자 센드빌 ID (etc01 코드에 따라 결정)" },
+          recvid: { type: "string", description: "공급받는자 센드빌 ID (etc01 코드에 따라 결정)" },
+          etc01: { type: "string", description: "ID 구분 (X=거래처ID, I=공급자ID+거래처ID, S=양쪽 센드빌ID, 기본값 X)" },
+          etc03: { type: "string", description: "비회원 자동가입 여부 (Y/N, 기본값 N)" },
+          file_url: { type: "string", description: "첨부파일 URL (최대 250자)" },
+          upbillseq: { type: "string", description: "수정세금계산서의 원본 고유번호" },
+          report_amend_cd: { type: "string", description: "수정사유 코드 (1=착오정정, 2=공급가액변동, 3=환입, 4=계약해제, 5=내국신용장, 6=이중발행)" },
+          item: {
+            type: "array",
+            description: "품목 목록 (필수)",
+            items: {
+              type: "object",
+              properties: {
+                tax: { type: "string", description: "품목별 세액" },
+                sup: { type: "string", description: "품목별 공급가액" },
+                danga: { type: "string", description: "단가" },
+                vlm: { type: "string", description: "수량" },
+                unit: { type: "string", description: "규격" },
+                obj: { type: "string", description: "품목명" },
+                dt: { type: "string", description: "품목별 거래일자 (YYYY-MM-DD)" },
+                remark: { type: "string", description: "비고" },
+              },
+              required: ["tax", "sup", "dt"],
+            },
+          },
+          broker: {
+            type: "object",
+            description: "수탁자 정보 (billtype 40/41/50/51인 경우만 사용)",
+            properties: {
+              venderno: { type: "string" },
+              company: { type: "string" },
+              ceoname: { type: "string" },
+              uptae: { type: "string" },
+              upjong: { type: "string" },
+              address: { type: "string" },
+              email: { type: "string" },
+              nid: { type: "string", description: "연동ID" },
+            },
+          },
+        },
+        required: [
+          "billseq", "svenderno", "rvenderno", "dt", "supmoney", "taxmoney",
+          "billtype", "gubun", "scompany", "sceoname", "rcompany", "rceoname",
+          "report_except_yn", "reverseyn", "item"
+        ],
+      },
+    },
+    {
+      name: "sendbill_register_invoice_multi",
+      description:
+        "수정세금계산서를 최대 2건 동시 발행합니다. (묶음 발행)\n" +
+        "POST /api/agent/document/registMultiDirect\n" +
+        "주로 기재사항 착오/정정, 내국신용장 사후 개설 시 원본+수정본을 한 번에 발행할 때 사용.\n" +
+        "1건이라도 오류 시 전체 취소됩니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          documents: {
+            type: "array",
+            description: "발행할 계산서 목록 (최대 2건). 각 항목은 sendbill_register_invoice와 동일한 형식.",
+            items: { type: "object" },
+            maxItems: 2,
+          },
+        },
+        required: ["documents"],
+      },
+    },
+    {
+      name: "sendbill_register_invoice_bulk",
+      description:
+        "전자세금계산서를 최대 100건 대량 발행합니다.\n" +
+        "POST /api/agent/document/registBulkDirect\n" +
+        "일부 실패 시에도 성공건은 발행됩니다. 응답에 성공/실패 건수와 오류 목록이 포함됩니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          documents: {
+            type: "array",
+            description: "발행할 계산서 목록 (최대 100건). 각 항목은 sendbill_register_invoice와 동일한 형식.",
+            items: { type: "object" },
+            maxItems: 100,
+          },
+        },
+        required: ["documents"],
+      },
+    },
+
+    // ── 계산서 조회/관리 ─────────────────────
+    {
+      name: "sendbill_get_invoice_status",
+      description:
+        "세금계산서의 상태를 단건 조회합니다.\n" +
+        "POST /api/agent/status/detail\n" +
+        "billstat 코드: 0=미개봉, 1=승인, 2=반려, 3=개봉, 4=승인취소, 5=미전송, 6=삭제, 9=종이문서저장\n" +
+        "transyn: Y=전송성공, N=전송대기, E=에러",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseq: { type: "string", description: "세금계산서 고유번호" },
+        },
+        required: ["billseq"],
+      },
+    },
+    {
+      name: "sendbill_get_invoice_status_list",
+      description:
+        "세금계산서 상태를 최대 1000건 다중 조회합니다.\n" +
+        "POST /api/agent/status/list",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseqs: {
+            type: "array",
+            description: "조회할 세금계산서 고유번호 목록 (최대 1000건)",
+            items: { type: "string" },
+            maxItems: 1000,
+          },
+        },
+        required: ["billseqs"],
+      },
+    },
+    {
+      name: "sendbill_manage_invoice",
+      description:
+        "세금계산서에 대한 관리 요청을 처리합니다. (삭제 또는 이메일 재전송)\n" +
+        "POST /api/agent/manager/registDirect\n" +
+        "cmd_div: 6=삭제요청, E=EMAIL 전송\n" +
+        "EMAIL 전송 시 remark에 전송할 이메일 주소를 입력하세요.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseq: { type: "string", description: "세금계산서 고유번호" },
+          cmd_div: { type: "string", description: "요청코드 (6=삭제, E=이메일전송)" },
+          remark: { type: "string", description: "이메일 전송 시 수신자 이메일 주소 (최대 500자)" },
+          etc1: { type: "string", description: "기타1 (최대 200자)" },
+          etc2: { type: "string", description: "기타2 (최대 200자)" },
+          etc3: { type: "string", description: "기타3 (최대 200자)" },
+          etc4: { type: "string", description: "기타4 (최대 200자)" },
+          etc5: { type: "string", description: "기타5 (최대 200자)" },
+        },
+        required: ["billseq", "cmd_div"],
+      },
+    },
+    {
+      name: "sendbill_get_invoice_error_log",
+      description:
+        "세금계산서 발행 시 발생한 에러 로그를 조회합니다.\n" +
+        "POST /api/agent/log/bill",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseq: { type: "string", description: "세금계산서 고유번호" },
+        },
+        required: ["billseq"],
+      },
+    },
+    {
+      name: "sendbill_get_manage_error_log",
+      description:
+        "계산서 관리 요청(삭제/이메일 전송 등) 시 발생한 에러 로그를 조회합니다.\n" +
+        "POST /api/agent/log/manager",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseq: { type: "string", description: "세금계산서 고유번호" },
+        },
+        required: ["billseq"],
+      },
+    },
+
+    // ── 회원 관리 ────────────────────────────
+    {
+      name: "sendbill_register_member",
+      description:
+        "센드빌에 거래처(비회원)를 임시 회원으로 등록합니다.\n" +
+        "POST /api/agent/member/registDirect\n" +
+        "비회원 세금계산서를 사용하지 않는 경우, 반드시 거래처가 센드빌에 등록되어 있어야 합니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          entcode: { type: "string", description: "제휴업체 코드 (4자리)" },
+          id: { type: "string", description: "회원 아이디 (최대 20자)" },
+          company: { type: "string", description: "업체명 (최대 200자)" },
+          venderno: { type: "string", description: "사업자 등록번호 (하이픈 제외 10자리)" },
+          ceoname: { type: "string", description: "대표자명 (최대 100자)" },
+          uptae: { type: "string", description: "업태 (최대 100자)" },
+          upjong: { type: "string", description: "업종 (최대 100자)" },
+          address: { type: "string", description: "주소 (최대 150자)" },
+          mgmt_yn: { type: "string", description: "관리자 구분 (Y/N)" },
+          email_yn: { type: "string", description: "이메일 수신 여부 (Y/N)" },
+          sms_yn: { type: "string", description: "SMS 수신 여부 (Y/N)" },
+          zipcode: { type: "string", description: "우편번호 (6자리)" },
+          address2: { type: "string", description: "상세주소" },
+          email: { type: "string", description: "이메일" },
+          users: { type: "string", description: "담당자명" },
+          fax: { type: "string", description: "팩스번호" },
+          tel: { type: "string", description: "전화번호" },
+          division: { type: "string", description: "부서명" },
+          resno: { type: "string", description: "주민등록번호 (13자리)" },
+          smsno: { type: "string", description: "핸드폰번호" },
+          sign_yn: { type: "string", description: "담당자 동의 여부 (Y/N)" },
+        },
+        required: ["entcode", "id", "company", "venderno", "ceoname", "uptae", "upjong", "address", "mgmt_yn", "email_yn", "sms_yn"],
+      },
+    },
+    {
+      name: "sendbill_get_member_error_log",
+      description:
+        "회원 등록 요청 시 발생한 에러 로그를 조회합니다.\n" +
+        "POST /api/agent/log/member",
+      inputSchema: {
+        type: "object",
+        properties: {
+          entcode: { type: "string", description: "제휴업체 코드 (최대 6자리)" },
+          userid: { type: "string", description: "회원 아이디(임시가입) (최대 30자)" },
+        },
+        required: ["entcode", "userid"],
+      },
+    },
+
+    // ── 홈택스 연동 ──────────────────────────
+    {
+      name: "sendbill_hometax_query_tax_invoice",
+      description:
+        "홈택스에서 세금계산서 매출/매입 내역을 조회합니다.\n" +
+        "direction: sales=매출, purchase=매입\n" +
+        "period: daily=일별(basedate), monthly=월별(basemonth)\n" +
+        "taxtype: '01'=과세+영세, '03'=면세\n" +
+        "datetype: '01'=작성일자, '02'=발행일자\n" +
+        "orderdirection: '01'=내림차순, '02'=오름차순\n" +
+        "⚠️ 홈택스 접근제어로 30건당 5초 딜레이가 있습니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          direction: { type: "string", enum: ["sales", "purchase"], description: "조회 방향 (sales=매출, purchase=매입)" },
+          period: { type: "string", enum: ["daily", "monthly"], description: "조회 주기 (daily=일별, monthly=월별)" },
+          venderno: { type: "string", description: "사업자번호 (10자리)" },
+          taxtype: { type: "string", description: "과세구분 ('01'=과세+영세, '03'=면세)" },
+          datetype: { type: "string", description: "기준일자 유형 ('01'=작성일자, '02'=발행일자)" },
+          basedate: { type: "string", description: "기준일자 (YYYYMMDD, period=daily일 때)" },
+          basemonth: { type: "string", description: "기준월 (YYYYMM, period=monthly일 때)" },
+          orderdirection: { type: "string", description: "정렬방향 ('01'=내림차순, '02'=오름차순)" },
+        },
+        required: ["direction", "period", "venderno", "taxtype", "datetype", "orderdirection"],
+      },
+    },
+    {
+      name: "sendbill_hometax_query_cash_receipt",
+      description:
+        "홈택스에서 현금영수증 매출/매입 내역을 조회합니다.\n" +
+        "direction: sales=매출, purchase=매입\n" +
+        "period: daily=일별(basedate), monthly=월별(basemonth)\n" +
+        "orderdirection: '01'=내림차순, '02'=오름차순\n" +
+        "⚠️ 홈택스 접근제어로 30건당 5초 딜레이가 있습니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          direction: { type: "string", enum: ["sales", "purchase"], description: "조회 방향 (sales=매출, purchase=매입)" },
+          period: { type: "string", enum: ["daily", "monthly"], description: "조회 주기 (daily=일별, monthly=월별)" },
+          venderno: { type: "string", description: "사업자번호 (10자리)" },
+          basedate: { type: "string", description: "기준일자 (YYYYMMDD, period=daily일 때)" },
+          basemonth: { type: "string", description: "기준월 (YYYYMM, period=monthly일 때)" },
+          orderdirection: { type: "string", description: "정렬방향 ('01'=내림차순, '02'=오름차순)" },
+        },
+        required: ["direction", "period", "venderno", "orderdirection"],
+      },
+    },
+    {
+      name: "sendbill_hometax_register_account",
+      description:
+        "홈택스 연동을 위한 홈택스 계정을 센드빌에 등록합니다.\n" +
+        "POST /api/agent/hometax/account/regist\n" +
+        "세금계산서용과 현금영수증용 계정을 별도로 사용합니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          jwt: { type: "string", description: "sendbill_get_token으로 발급받은 토큰" },
+          billhtid: { type: "string", description: "세금계산서용 홈택스 아이디" },
+          billhtpw: { type: "string", description: "세금계산서용 홈택스 패스워드" },
+          cashhtid: { type: "string", description: "현금영수증용 홈택스 아이디" },
+          cashhtpw: { type: "string", description: "현금영수증용 홈택스 패스워드" },
+        },
+        required: ["jwt", "billhtid", "billhtpw", "cashhtid", "cashhtpw"],
+      },
+    },
+    {
+      name: "sendbill_hometax_delete_account",
+      description:
+        "홈택스 연동계정을 센드빌에서 삭제합니다.\n" +
+        "POST /api/agent/hometax/account/delete\n" +
+        "계정 존재 유무에 대한 결과는 반환되지 않습니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          jwt: { type: "string", description: "sendbill_get_token으로 발급받은 토큰" },
+        },
+        required: ["jwt"],
+      },
+    },
+    {
+      name: "sendbill_hometax_get_register_view",
+      description:
+        "타사가 직접 홈택스 연동계정을 등록할 수 있는 폼 URL을 생성합니다. (유효시간: 10분)\n" +
+        "POST /api/agent/hometax/account/getRegistView",
+      inputSchema: {
+        type: "object",
+        properties: {
+          venderno: { type: "string", description: "사업자번호 (하이픈 제외 10자리)" },
+        },
+        required: ["venderno"],
+      },
+    },
+
+    // ── 휴폐업 조회 ──────────────────────────
+    {
+      name: "sendbill_company_close_search",
+      description:
+        "사업자의 휴업/폐업 상태를 최대 100건 조회합니다.\n" +
+        "POST /api/agent/companyclosesearch\n" +
+        "국세청 데이터를 실시간으로 조회합니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          venderno: {
+            type: "array",
+            description: "조회할 사업자번호 목록 (하이픈 제외 10자리, 최대 100건)",
+            items: { type: "string" },
+            maxItems: 100,
+          },
+        },
+        required: ["venderno"],
+      },
+    },
+
+    // ── 추가메일 전송 ─────────────────────────
+    {
+      name: "sendbill_send_additional_mail",
+      description:
+        "이미 발행한 계산서의 이메일을 추가 주소로 재전송합니다.\n" +
+        "POST /api/agent/additionalMail/sendAdditionalMail",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseq: { type: "string", description: "발행 문서 고유번호 (최대 19자)" },
+          sendType: { type: "string", description: "전송타입 코드" },
+          newMailAddress: { type: "string", description: "신규 전송 메일 주소 (최대 30자)" },
+        },
+        required: ["billseq", "sendType", "newMailAddress"],
+      },
+    },
+    {
+      name: "sendbill_get_mail_send_list",
+      description:
+        "API로 발행한 계산서의 이메일 전송 내역과 수신 여부를 조회합니다.\n" +
+        "POST /api/agent/additionalMail/sendMailList",
+      inputSchema: {
+        type: "object",
+        properties: {
+          billseq: { type: "string", description: "API 발행 문서 고유번호 (최대 19자)" },
+        },
+        required: ["billseq"],
+      },
+    },
+
+    // ── 참조 도구 ─────────────────────────────
+    {
+      name: "sendbill_get_error_message",
+      description:
+        "센드빌 API 에러코드에 해당하는 한국어 메시지를 조회합니다.\n" +
+        "API 응답에서 음수 Result 코드를 받았을 때 사용하세요.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          code: { type: "number", description: "에러코드 (음수, 예: -10001)" },
+        },
+        required: ["code"],
+      },
+    },
+    {
+      name: "sendbill_get_code_tables",
+      description:
+        "센드빌 API에서 사용하는 코드표 전체를 반환합니다.\n" +
+        "billtype, cmd_div, taxrate, billstat, gubun, etc01, report_stat, report_amend_cd 코드를 확인할 수 있습니다.",
+      inputSchema: {
+        type: "object",
+        properties: {
+          table: {
+            type: "string",
+            enum: ["billtype", "cmd_div", "taxrate", "billstat", "gubun", "etc01", "report_stat", "report_amend_cd", "all"],
+            description: "조회할 코드표 이름 (all=전체 조회)",
+          },
+        },
+        required: ["table"],
+      },
+    },
+  ],
+}));
+
+// ─────────────────────────────────────────────
+// 툴 실행 핸들러
+// ─────────────────────────────────────────────
+server.setRequestHandler(CallToolRequestSchema, async (request) => {
+  const { name, arguments: args } = request.params;
+
+  // 참조 도구는 API 호출 없음
+  if (name === "sendbill_get_error_message") {
+    const code = (args as { code: number }).code;
+    const message = getErrorMessage(code);
+    return {
+      content: [{ type: "text", text: `에러코드 ${code}: ${message}` }],
+    };
+  }
+
+  if (name === "sendbill_get_code_tables") {
+    const table = (args as { table: string }).table;
+    if (table === "all") {
+      return {
+        content: [{ type: "text", text: JSON.stringify(CODE_TABLES, null, 2) }],
+      };
+    }
+    const tableData = CODE_TABLES[table as keyof typeof CODE_TABLES];
+    if (!tableData) {
+      return {
+        content: [{ type: "text", text: `코드표 '${table}'를 찾을 수 없습니다.` }],
+        isError: true,
+      };
+    }
+    return {
+      content: [{ type: "text", text: JSON.stringify({ [table]: tableData }, null, 2) }],
+    };
+  }
+
+  // API 호출 도구
+  const client = createClient();
+
+  type EndpointMap = Record<string, [string, (a: Record<string, unknown>) => Record<string, unknown>]>;
+
+  const endpoints: EndpointMap = {
+    // 인증서 관리
+    sendbill_get_token: ["/api/agent/certificate/gettoken", (a) => ({ venderno: a.venderno })],
+    sendbill_upload_cert: ["/api/agent/certificate/uploadcert", (a) => ({
+      jwt: a.jwt, password: a.password, certderfile: a.certderfile, certkeyfile: a.certkeyfile
+    })],
+    sendbill_inquire_cert: ["/api/agent/certificate/inquirecert", (a) => ({ jwt: a.jwt })],
+    sendbill_delete_cert: ["/api/agent/certificate/deletecert", (a) => ({ jwt: a.jwt, password: a.password })],
+    sendbill_get_cert_upload_view: ["/api/agent/certificate/getuploadview", (a) => ({ venderno: a.venderno })],
+
+    // 계산서 발행
+    sendbill_register_invoice: ["/api/agent/document/registDirect", (a) => a],
+    sendbill_register_invoice_multi: ["/api/agent/document/registMultiDirect", (a) => a],
+    sendbill_register_invoice_bulk: ["/api/agent/document/registBulkDirect", (a) => a],
+
+    // 계산서 조회/관리
+    sendbill_get_invoice_status: ["/api/agent/status/detail", (a) => ({ billseq: a.billseq })],
+    sendbill_get_invoice_status_list: ["/api/agent/status/list", (a) => ({ billseqs: a.billseqs })],
+    sendbill_manage_invoice: ["/api/agent/manager/registDirect", (a) => a],
+    sendbill_get_invoice_error_log: ["/api/agent/log/bill", (a) => ({ billseq: a.billseq })],
+    sendbill_get_manage_error_log: ["/api/agent/log/manager", (a) => ({ billseq: a.billseq })],
+
+    // 회원 관리
+    sendbill_register_member: ["/api/agent/member/registDirect", (a) => a],
+    sendbill_get_member_error_log: ["/api/agent/log/member", (a) => ({ entcode: a.entcode, userid: a.userid })],
+
+    // 홈택스 연동
+    sendbill_hometax_register_account: ["/api/agent/hometax/account/regist", (a) => a],
+    sendbill_hometax_delete_account: ["/api/agent/hometax/account/delete", (a) => ({ jwt: a.jwt })],
+    sendbill_hometax_get_register_view: ["/api/agent/hometax/account/getRegistView", (a) => ({ venderno: a.venderno })],
+
+    // 휴폐업 조회
+    sendbill_company_close_search: ["/api/agent/companyclosesearch", (a) => ({ venderno: a.venderno })],
+
+    // 추가메일
+    sendbill_send_additional_mail: ["/api/agent/additionalMail/sendAdditionalMail", (a) => a],
+    sendbill_get_mail_send_list: ["/api/agent/additionalMail/sendMailList", (a) => ({ billseq: a.billseq })],
+  };
+
+  // 홈택스 조회는 방향+주기에 따라 엔드포인트가 다름
+  if (name === "sendbill_hometax_query_tax_invoice") {
+    const a = args as Record<string, unknown>;
+    const direction = a.direction as string;
+    const period = a.period as string;
+
+    const endpointMap: Record<string, string> = {
+      "sales-daily": "/api/agent/hometax/listDailyTaxInvoiceSales",
+      "sales-monthly": "/api/agent/hometax/listMonthlyTaxInvoiceSales",
+      "purchase-daily": "/api/agent/hometax/listDailyTaxInvoicePurchase",
+      "purchase-monthly": "/api/agent/hometax/listMonthlyTaxInvoicePurchase",
+    };
+
+    const endpoint = endpointMap[`${direction}-${period}`];
+    if (!endpoint) {
+      return { content: [{ type: "text", text: "잘못된 direction 또는 period 값입니다." }], isError: true };
+    }
+
+    const body: Record<string, unknown> = {
+      venderno: a.venderno,
+      taxtype: a.taxtype,
+      datetype: a.datetype,
+      orderdirection: a.orderdirection,
+    };
+    if (period === "daily") body.basedate = a.basedate;
+    else body.basemonth = a.basemonth;
+
+    try {
+      const result = await client.post(endpoint, body);
+      const text = formatResult(result);
+      return { content: [{ type: "text", text }] };
+    } catch (err: unknown) {
+      const message = err instanceof Error ? err.message : String(err);
+      return { content: [{ type: "text", text: `API 오류: ${message}` }], isError: true };
+    }
+  }
+
+  if (name === "sendbill_hometax_query_cash_receipt") {
+    const a = args as Record<string, unknown>;
+    const direction = a.direction as string;
+    const period = a.period as string;
+
+    const endpointMap: Record<string, string> = {
+      "sales-daily": "/api/agent/hometax/listDailyCashBillSales",
+      "sales-monthly": "/api/agent/hometax/listMonthlyCashBillSales",
+      "purchase-daily": "/api/agent/hometax/listDailyCashBillPurchase",
+      "purchase-monthly": "/api/agent/hometax/listMonthlyCashBillPurchase",
+    };
+
+    const endpoint = endpointMap[`${direction}-${period}`];
+    if (!endpoint) {
+      return { content: [{ type: "text", text: "잘못된 direction 또는 period 값입니다." }], isError: true };
+    }
+
+    const body: Record<string, unknown> = {
+      venderno: a.venderno,
+      orderdirection: a.orderdirection,
+    };
+    if (period === "daily") body.basedate = a.basedate;
+    else body.basemonth = a.basemonth;
+
+    try {
+      const result = await client.post(endpoint, body);
+      const text = formatResult(result);
+      return { content: [{ type: "text", text }] };
+    } catch (err: unknown) {
+      const message = err instanceof Error ? err.message : String(err);
+      return { content: [{ type: "text", text: `API 오류: ${message}` }], isError: true };
+    }
+  }
+
+  // 일반 엔드포인트 처리
+  const entry = endpoints[name];
+  if (!entry) {
+    return {
+      content: [{ type: "text", text: `알 수 없는 툴: ${name}` }],
+      isError: true,
+    };
+  }
+
+  const [endpoint, buildBody] = entry;
+  const body = buildBody(args as Record<string, unknown>);
+
+  try {
+    const result = await client.post(endpoint, body);
+    const text = formatResult(result);
+    return { content: [{ type: "text", text }] };
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : String(err);
+    return { content: [{ type: "text", text: `API 오류: ${message}` }], isError: true };
+  }
+});
+
+function formatResult(result: unknown): string {
+  if (typeof result !== "object" || result === null) {
+    return String(result);
+  }
+  const obj = result as Record<string, unknown>;
+  const lines: string[] = [];
+
+  // Result 코드 해석
+  if ("Result" in obj || "result" in obj) {
+    const code = (obj.Result ?? obj.result) as number;
+    const msg = (obj.Message ?? obj.message) as string | undefined;
+    if (code < 0) {
+      lines.push(`❌ 실패 (Result: ${code})`);
+      lines.push(`   오류: ${msg ?? getErrorMessage(code)}`);
+    } else {
+      lines.push(`✅ 성공 (Result: ${code})`);
+      if (msg) lines.push(`   메시지: ${msg}`);
+    }
+  }
+
+  // 나머지 데이터
+  const skip = new Set(["Result", "result", "Message", "message"]);
+  const rest = Object.fromEntries(Object.entries(obj).filter(([k]) => !skip.has(k)));
+  if (Object.keys(rest).length > 0) {
+    lines.push("\n데이터:");
+    lines.push(JSON.stringify(rest, null, 2));
+  }
+
+  return lines.join("\n") || JSON.stringify(result, null, 2);
+}
+
+// ─────────────────────────────────────────────
+// 서버 시작
+// ─────────────────────────────────────────────
+async function main() {
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  // stderr에만 출력 (stdout은 MCP 프로토콜 전용)
+  process.stderr.write("센드빌 MCP 서버 시작됨\n");
+}
+
+main().catch((err) => {
+  process.stderr.write(`치명적 오류: ${err}\n`);
+  process.exit(1);
+});
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..12bf830
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ES2022",
+    "moduleResolution": "node",
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}