diff --git a/.env.example b/.env.example
index 05893d58..4a592944 100644
--- a/.env.example
+++ b/.env.example
@@ -7,6 +7,7 @@ SWARM_TOKEN=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 CHANNEL_SANDBOX=CXXXXXXXX
 CHANNEL_ESOLANG=CXXXXXXXX
 CHANNEL_PROCON=CXXXXXXXX
+CHANNEL_SCRAPBOX=CXXXXXXXX
 CHANNEL_RANDOM=CXXXXXXXX
 USER_TSGBOT=UXXXXXXXX
 GITHUB_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
@@ -14,6 +15,7 @@ GOOGLE_APPLICATION_CREDENTIALS=google_application_credentials.json
 FIREBASE_ENDPOINT=https://hakata-shi.firebaseio.com
 ACCUWEATHER_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 SCRAPBOX_SID=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+SCRAPBOX_PROJECT_NAME=xxxxxxxxx
 GITHUB_WEBHOOK_SECRET=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 SIGNING_SECRET=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 PORT=21864
diff --git a/index.js b/index.js
index 87760ee7..35ddcadc 100644
--- a/index.js
+++ b/index.js
@@ -31,6 +31,7 @@ const allBots = [
 	// ...(word2vecInstalled ? ['vocabwar'] : []),
 	'ricochet-robots',
 	'scrapbox',
+	'scrapbox/mute',
 	'slack-log',
 	'welcome',
 	'deploy',
diff --git a/lib/fastify.test.ts b/lib/fastify.test.ts
new file mode 100644
index 00000000..614633b9
--- /dev/null
+++ b/lib/fastify.test.ts
@@ -0,0 +1,24 @@
+import plugin from 'fastify-plugin';
+import { fastifyDevConstructor } from './fastify';
+import { FastifyInstance } from 'fastify';
+
+describe('fastifyDevConstructor', () => {
+    it('throws error when error occures during request', () => {
+        const fastify: FastifyInstance = fastifyDevConstructor();
+        const msg = 'Dummy error.';
+        const path = '/path/to/somewhere';
+        fastify.register(plugin((fastify, opts, next) => {
+            fastify.get(path, (req) => {
+                throw Error(msg);
+            })
+            next();
+        }))
+        expect(
+            fastify.inject({
+                method: 'GET',
+                url: path,
+                payload: {something: 'hoge'},
+            })
+        ).rejects.toThrow(msg);
+    })
+});
diff --git a/lib/fastify.ts b/lib/fastify.ts
new file mode 100644
index 00000000..21444624
--- /dev/null
+++ b/lib/fastify.ts
@@ -0,0 +1,34 @@
+import fastifyConstructor, { FastifyInstance } from 'fastify';
+
+/**
+ * 単体テストに適した設定がなされたfastifyインスタンスを生成する
+ * 
+ * @param opts fastifyConstructor に渡す引数
+ * @example
+ * import slack from '../lib/slackMock.js';
+ * import {fastifyDevConstructor} from '../lib/fastify';
+ * import {server} from './index';
+ * 
+ * const fastify = fastifyDevConstructor();
+ * fastify.register(server(slack));
+ */
+
+export const fastifyDevConstructor = (opts?: Parameters<typeof fastifyConstructor>[0]): FastifyInstance => {
+    // TODO: support generics of fastifyConstructor
+    /*
+     * Setting the return type to ReturnType<fastifyConstructor> causes typeerror
+     * because type Server is not compatible with type Http2SecureServer
+     * Maybe because of not handling the generics of fastifyConstructor
+     */
+
+    const fastify = fastifyConstructor({ logger: true , ...opts });
+
+    /**
+     * デフォルトのエラーハンドラはエラーをログに出力して握り潰すため，
+     * 単体テストでexpectの失敗などによる例外をJestが検知することができない
+     * 発生した例外は全て再送出するように設定
+     */
+    fastify.setErrorHandler((err) => { throw err; });
+
+    return fastify;
+};
diff --git a/lib/scrapbox.test.ts b/lib/scrapbox.test.ts
new file mode 100644
index 00000000..95f0e96c
--- /dev/null
+++ b/lib/scrapbox.test.ts
@@ -0,0 +1,184 @@
+const defaultProjectName = 'default_proj';
+process.env.SCRAPBOX_PROJECT_NAME = defaultProjectName;
+const defaultToken = 'default_token';
+process.env.SCRAPBOX_SID = defaultToken;
+
+jest.mock('axios');
+import _axios from 'axios';
+const axios = _axios as jest.Mocked<typeof _axios>;
+
+import { isPageOfProject, fetchScrapboxUrl, Page, pageUrlRegExp } from './scrapbox';
+
+beforeEach(() => {
+    axios.get.mockReset();
+})
+
+describe('fetchScrapboxUrl', () => {
+    const data = {dummy: 'data'};
+    const url = 'dummy_url';
+    const token = 'dummy_token';
+
+    beforeEach(() => {
+        axios.get.mockResolvedValueOnce({ data });
+    });
+
+    it('fetches given URL with given token', async () => {
+        const res = await fetchScrapboxUrl({ url, token });
+        expect(res).toEqual(data);
+        expect(axios.get.mock.calls.length).toBe(1);
+        expect(axios.get.mock.calls[0][0]).toBe(url);
+        expect(axios.get.mock.calls[0][1]!.headers.Cookie).toContain(token);
+    });
+
+    it('uses default token if not specified', async () => {
+        await fetchScrapboxUrl({ url });
+        expect(axios.get.mock.calls[0][1]!.headers.Cookie).toContain(defaultToken);
+    });
+});
+
+describe('pageUrlRegExp', () => {
+    const projectName = 'proj';
+    const titleLc = 'タイトル';
+    const hash = 'hash';
+
+    it('parses URL without hash', () => {
+        const match = `https://scrapbox.io/${projectName}/${titleLc}`.match(pageUrlRegExp);
+        expect(match).not.toBeNull();
+        expect(match!.groups).toMatchObject({ projectName, titleLc });
+    });
+
+    it('parses URL with hash', () => {
+        const match = `https://scrapbox.io/${projectName}/${titleLc}#${hash}`.match(pageUrlRegExp);
+        expect(match).not.toBeNull();
+        expect(match!.groups).toMatchObject({ projectName, titleLc, hash });
+    });
+});
+
+describe('isPageOfProject', () => {
+    const projectName = 'proj';
+    const projectName2 = 'proj2';
+    const titleLc = 'タイトル';
+
+    it('returns true for Scrapbox URL of specified project', () => {
+        const url = `https://scrapbox.io/${projectName}/${titleLc}`;
+        expect(isPageOfProject({ url, projectName })).toBe(true);
+    });
+
+    it('returns false for Scrapbox URL of specified project', () => {
+        const url = `https://scrapbox.io/${projectName2}/${titleLc}`;
+        expect(isPageOfProject({ url, projectName })).toBe(false);
+    });
+
+    it('returns false for strings not Scrapbox URL', () => {
+        const url = 'hoge';
+        expect(isPageOfProject({ url, projectName })).toBe(false);
+    });
+
+    test.each([
+        {projectName: defaultProjectName, expected: true},
+        {projectName: projectName, expected: false}
+    ])('uses projectName specified in envvar when not specified #%#', ({ projectName, expected }) => {
+        const url = `https://scrapbox.io/${projectName}/${titleLc}`;
+        expect(isPageOfProject({ url })).toBe(expected);
+    });
+});
+
+describe('Page', () => {
+    const projectName = 'proj';
+    const titleLc = 'タイトル';
+    const encodedTitleLc = encodeURIComponent(titleLc);
+    const hash = 'hash';
+    const token = 'token';
+
+    describe('constructor', () => {
+        const assertProperties = (page: Page): void => {
+            expect(page.token).toBe(token);
+            expect(page.projectName).toBe(projectName);
+            expect(page.titleLc).toBe(titleLc);
+            expect(page.encodedTitleLc).toBe(encodedTitleLc);
+            expect(page.hash).toBe(hash);
+        };
+
+        const generateURL = ({ projectName, titleLc, hash }: { projectName: string; titleLc: string; hash: string }) => 
+            `https://scrapbox.io/${projectName}/${titleLc}#${hash}`;
+
+        it('handles unencoded titleLc', () => {
+            assertProperties(new Page({ titleLc, projectName, hash, isEncoded: false, token }));
+        });
+
+        it('handles encoded titleLc', () => {
+            assertProperties(new Page({ titleLc: encodedTitleLc, projectName, hash, isEncoded: true, token }));
+        });
+
+        it('assumes unencoded titleLc to be unencoded', () => {
+            assertProperties(new Page({ titleLc, projectName, hash, isEncoded: undefined, token }));
+        });
+
+        it('assumes encoded titleLc to be encoded', () => {
+            assertProperties(new Page({ titleLc: encodedTitleLc, projectName, hash, isEncoded: undefined, token }));
+        });
+
+
+        it('handles unencoded URL', () => {
+            const url = generateURL({ projectName, titleLc, hash });
+            assertProperties(new Page({ url, isEncoded: false, token }));
+        });
+
+        it('handles encoded URL', () => {
+            const url = generateURL({ projectName, titleLc: encodedTitleLc, hash });
+            assertProperties(new Page({ url, isEncoded: true, token }));
+        });
+
+        it('assumes unencoded URL to be unencoded', () => {
+            const url = generateURL({ projectName, titleLc, hash });
+            assertProperties(new Page({ url, isEncoded: undefined, token }));
+        });
+
+        it('assumes encoded URL to be encoded', () => {
+            const url = generateURL({ projectName, titleLc: encodedTitleLc, hash });
+            assertProperties(new Page({ url, isEncoded: undefined, token }));
+        });
+        it('handles encoded URL', () => {
+            const url = generateURL({ projectName, titleLc: encodedTitleLc, hash });
+            assertProperties(new Page({ url, isEncoded: undefined, token }));
+        });
+
+        it('handles missing parameters when specified titleLc', () => {
+            const page = new Page({ titleLc });
+            expect(page.projectName).toBe(defaultProjectName);
+            expect(page.token).toBe(defaultToken);
+            expect(page.hash).toBeUndefined();
+        });
+
+        it('handles missing parameters when specified URL', () => {
+            const page = new Page({ titleLc });
+            expect(page.token).toBe(defaultToken);
+        });
+
+        it('throws error on invalid URL', () => {
+            expect(() => new Page({ url: 'hoge' })).toThrow();
+        })
+    });
+    
+    describe('methods', () => {
+        let page: Page | null = null;
+        beforeEach(() => {
+            page = new Page({ titleLc, projectName, hash, token });
+        });
+
+        test('.url is correct', () => {
+            expect(page!.url).toBe(`https://scrapbox.io/${projectName}/${encodedTitleLc}#${hash}`);
+        });
+
+        test('.infoUrl is correct', () => {
+            expect(page!.infoUrl).toBe(`https://scrapbox.io/api/pages/${projectName}/${encodedTitleLc}`);
+        });
+
+        test('.fetchInfo() fetches from correct URL', async () => {
+            axios.get.mockResolvedValueOnce({ data: {} });
+            await page!.fetchInfo();
+            expect(axios.get.mock.calls.length).toBe(1);
+            expect(axios.get.mock.calls[0][0]/* url of 0th call */).toBe(page!.infoUrl);
+        });
+    });
+});
diff --git a/lib/scrapbox.ts b/lib/scrapbox.ts
new file mode 100644
index 00000000..cc91658e
--- /dev/null
+++ b/lib/scrapbox.ts
@@ -0,0 +1,203 @@
+import axios from 'axios';
+
+export const tsgProjectName = process.env.SCRAPBOX_PROJECT_NAME!;
+export const tsgScrapboxToken = process.env.SCRAPBOX_SID!;
+
+/**
+ * ScrapboxのURLにマッチする正規表現
+ * Groups: { projectName, titleLc, hash }
+ */
+export const pageUrlRegExp = /^https?:\/\/scrapbox\.io\/(?<projectName>.+?)\/(?<titleLc>.+?)(?:#(?<hash>.*))?$/;
+
+/**
+ * URLが指定したプロジェクトのURLか判定
+ */
+export const isPageOfProject = ({ url, projectName = tsgProjectName }: { url: string, projectName?: string }) => {
+    const match = url.match(pageUrlRegExp);
+    return match !== null && match.groups!.projectName === projectName;
+};
+
+/**
+ * ScrapboxのURLをトークンをつけてGETリクエスト
+ */
+export const fetchScrapboxUrl =  async <T> ({ url, token = tsgScrapboxToken }: { url: string; token?: string }): Promise<T> => {
+    // TODO: support axios config
+    return (await axios.get(
+        url,
+        { headers: { Cookie: `connect.sid=${token}` } },
+    )).data;
+}
+
+export interface User {
+    id: string;
+    name: string;
+    displayName: string;
+    photo: string;
+}
+
+export interface Line {
+    id: string;
+    text: string;
+    userId: string;
+    created: number;
+    updated: number;
+}
+
+export interface Link {
+    id: string;
+    title: string;
+    titleLc: string;
+    image?: string;
+    descriptions: string[];
+    linksLc: string[];
+    updated: number;
+    accessed: number;
+}
+
+/**
+ * Scrapbox APIのページ情報の返り値
+ */
+export interface PageInfo {
+    id: string;
+    title: string;
+    image?: string;
+    descriptions: string[];
+    user: User;
+    pin: number;
+    views: number;
+    linked: number;
+    commitId: string;
+    created: number;
+    updated: number;
+    accessed: number;
+    snapshotCreated?: number;
+    persistent: boolean;
+    lines: Line[];
+    links: string[];
+    icons: {
+        [key: string]: number;
+    };
+    relatedPages: {
+        links1hop: Link[];
+        links2hop: Link[];
+        icons1hop: unknown[]; // could not find a page that has icons1hop
+    }
+    collaborators: User[];
+    lastAccessed: number;
+}
+
+
+const decodeIfNeeded =  ({ str, isEncoded = undefined }: { str: string; isEncoded?: boolean }): { str: string; isEncoded?: boolean } => {
+    if (isEncoded === true || isEncoded === undefined) {
+        try {
+            str = decodeURIComponent(str);
+        } catch (err) {
+            // str is not a valid encoded string
+            if (isEncoded === true) throw err;
+            isEncoded = false;
+        }
+    }
+    return { str, isEncoded };
+}
+
+const encodeIfNeeded = ({ str, isEncoded = undefined }: { str: string; isEncoded?: boolean }): { str: string; isEncoded: boolean } => {
+    if (isEncoded === undefined) {
+        isEncoded = false;
+        try {
+            if (decodeURIComponent(str) !== str) {
+                isEncoded = true;
+            }
+        } catch {
+            // str is not a valid encoded string
+        }
+    }
+    return { str: isEncoded ? str: encodeURIComponent(str),  isEncoded };
+}
+
+const parsePageUrl = (url: string): { titleLc: string; projectName: string; hash: string } => {
+    const match = url.match(pageUrlRegExp);
+    if (match) {
+        const { titleLc, projectName, hash } = match.groups!;
+        return { titleLc, projectName, hash };
+    } else {
+        throw Error(`Invalid Scrapbox URL was given: ${url}`);
+    }
+};
+
+/**
+ * Scrapboxの記事
+ */
+export class Page {
+    /**  Scrapbox SID */
+    token: string;
+
+    /** Scrapbox プロジェクト名 */
+    projectName: string;
+
+    /** URIエンコードされたtitleLc */
+    encodedTitleLc: string;
+
+    /** URIエンコードされていないtitleLc */
+    titleLc: string
+
+    /** URL末尾のhash */
+    hash?: string;
+
+    /**
+     * Scrapboxの記事
+     * 
+     * URLあるいはtitleLc, [プロジェクト名, hash]を指定可能
+     * 
+     * @param args.token -  Scrapbox SID
+     * @param args.isEncoded - URLのtitleLc部分がURIエンコード済みかどうか. デフォルトではurlまたはtitleLcから判断.
+     * @param args.url - Scrapbox 記事のURL
+     * @param args.titleLc - URL上の記事タイトル. スペースが_に変換されるなど，表示上のタイトルとは異なる場合がある.
+     * @param args.projectName - Scrapboxプロジェクト名. デフォルトでは環境変数を用いる
+     * @param hash - URL末尾のhash
+     */
+    constructor(args: {
+        token?: string;
+        isEncoded?: boolean;
+    } & ({
+        url: string;
+    } | {
+        titleLc: string;
+        projectName?: string
+        hash?: string
+    })) {
+        this.token = args.token ?? tsgScrapboxToken;
+        const { isEncoded: isEncodedGiven } = args;
+        const { titleLc, projectName, hash } =
+            'titleLc' in args ? args :
+            'url' in args ? parsePageUrl(args.url) :
+            args as never; // exhaustive check
+            // TODO: remove `as never`
+            // args should be but is not never here because of a bug of TypeScript (#37039)
+        const { str: encodedTitleLc, isEncoded } = encodeIfNeeded({ str: titleLc, isEncoded: isEncodedGiven });
+        this.projectName = projectName ?? tsgProjectName;
+        this.encodedTitleLc = encodedTitleLc;
+        this.titleLc = decodeIfNeeded({ str: titleLc, isEncoded }).str;
+        this.hash = hash;
+    }
+
+    /**
+     * Scrapbox記事のURL
+     */
+    get url(): string {
+        return `https://scrapbox.io/${this.projectName}/${this.encodedTitleLc}${this.hash? `#${this.hash}` : ''}`
+    }
+
+    /**
+     * ページ情報APIのURL
+     */
+    get infoUrl(): string {
+        return `https://scrapbox.io/api/pages/${this.projectName}/${this.encodedTitleLc}`;
+    }
+
+    /**
+     * ページ情報をAPIから取得
+     */
+    async fetchInfo(): Promise<PageInfo> {
+        return fetchScrapboxUrl<PageInfo>({ url: this.infoUrl, token: this.token });
+    }
+}
diff --git a/package-lock.json b/package-lock.json
index 43559dbb..b9fbfbae 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -617,6 +617,12 @@
         "resolve-from": "^5.0.0"
       },
       "dependencies": {
+        "camelcase": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+          "dev": true
+        },
         "find-up": {
           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
@@ -627,6 +633,24 @@
             "path-exists": "^4.0.0"
           }
         },
+        "locate-path": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+          "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^4.1.0"
+          }
+        },
+        "p-locate": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+          "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.2.0"
+          }
+        },
         "path-exists": {
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
@@ -759,6 +783,15 @@
             "chalk": "^3.0.0"
           }
         },
+        "@types/yargs": {
+          "version": "15.0.3",
+          "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-15.0.3.tgz",
+          "integrity": "sha512-XCMQRK6kfpNBixHLyHUsGmXrpEmFFxzMrcnSXFMziHd8CoNJo8l16FkHyQq4x+xbM7E2XL83/O78OD8u+iZTdQ==",
+          "dev": true,
+          "requires": {
+            "@types/yargs-parser": "*"
+          }
+        },
         "ansi-escapes": {
           "version": "4.3.0",
           "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.0.tgz",
@@ -916,6 +949,15 @@
             "chalk": "^3.0.0"
           }
         },
+        "@types/yargs": {
+          "version": "15.0.3",
+          "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-15.0.3.tgz",
+          "integrity": "sha512-XCMQRK6kfpNBixHLyHUsGmXrpEmFFxzMrcnSXFMziHd8CoNJo8l16FkHyQq4x+xbM7E2XL83/O78OD8u+iZTdQ==",
+          "dev": true,
+          "requires": {
+            "@types/yargs-parser": "*"
+          }
+        },
         "ansi-styles": {
           "version": "4.2.1",
           "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
@@ -993,6 +1035,15 @@
             "chalk": "^3.0.0"
           }
         },
+        "@types/yargs": {
+          "version": "15.0.3",
+          "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-15.0.3.tgz",
+          "integrity": "sha512-XCMQRK6kfpNBixHLyHUsGmXrpEmFFxzMrcnSXFMziHd8CoNJo8l16FkHyQq4x+xbM7E2XL83/O78OD8u+iZTdQ==",
+          "dev": true,
+          "requires": {
+            "@types/yargs-parser": "*"
+          }
+        },
         "ansi-styles": {
           "version": "4.2.1",
           "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
@@ -1091,6 +1142,15 @@
             "chalk": "^3.0.0"
           }
         },
+        "@types/yargs": {
+          "version": "15.0.3",
+          "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-15.0.3.tgz",
+          "integrity": "sha512-XCMQRK6kfpNBixHLyHUsGmXrpEmFFxzMrcnSXFMziHd8CoNJo8l16FkHyQq4x+xbM7E2XL83/O78OD8u+iZTdQ==",
+          "dev": true,
+          "requires": {
+            "@types/yargs-parser": "*"
+          }
+        },
         "ansi-styles": {
           "version": "4.2.1",
           "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
@@ -1199,6 +1259,15 @@
             "chalk": "^3.0.0"
           }
         },
+        "@types/yargs": {
+          "version": "15.0.3",
+          "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-15.0.3.tgz",
+          "integrity": "sha512-XCMQRK6kfpNBixHLyHUsGmXrpEmFFxzMrcnSXFMziHd8CoNJo8l16FkHyQq4x+xbM7E2XL83/O78OD8u+iZTdQ==",
+          "dev": true,
+          "requires": {
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+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+          "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg=="
+        },
         "is-fullwidth-code-point": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
@@ -18078,6 +18239,11 @@
           "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
           "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w=="
         },
+        "require-main-filename": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+          "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg=="
+        },
         "string-width": {
           "version": "4.2.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
@@ -18095,16 +18261,44 @@
           "requires": {
             "ansi-regex": "^5.0.0"
           }
+        },
+        "which-module": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+          "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
+        },
+        "wrap-ansi": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
+          "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
+          "requires": {
+            "ansi-styles": "^4.0.0",
+            "string-width": "^4.1.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "y18n": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
+        },
+        "yargs-parser": {
+          "version": "16.1.0",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-16.1.0.tgz",
+          "integrity": "sha512-H/V41UNZQPkUMIT5h5hiwg4QKIY1RPvoBV4XcjUbRM8Bk2oKqqyZ0DIEbTFZB0XjbtSPG8SAa/0DxCQmiRgzKg==",
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
         }
       }
     },
     "yargs-parser": {
-      "version": "16.1.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-16.1.0.tgz",
-      "integrity": "sha512-H/V41UNZQPkUMIT5h5hiwg4QKIY1RPvoBV4XcjUbRM8Bk2oKqqyZ0DIEbTFZB0XjbtSPG8SAa/0DxCQmiRgzKg==",
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+      "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
       "requires": {
-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
+        "camelcase": "^3.0.0"
       }
     },
     "yauzl": {
diff --git a/package.json b/package.json
index 10f4fccb..7e880ef4 100644
--- a/package.json
+++ b/package.json
@@ -103,6 +103,7 @@
     "byline": "^5.0.0",
     "csv-parse": "^4.8.2",
     "eslint": "^6.7.2",
+    "eslint-plugin-jest": "^23.6.0",
     "eslint-plugin-react": "^7.17.0",
     "jest": "^25.1.0",
     "lolex": "^5.1.1",
diff --git a/scrapbox/.eslintrc.json b/scrapbox/.eslintrc.json
index e5638929..1d677067 100644
--- a/scrapbox/.eslintrc.json
+++ b/scrapbox/.eslintrc.json
@@ -1,8 +1,17 @@
 {
-    "extends": "@hakatashi",
+    "extends": ["plugin:jest/recommended", "@hakatashi"],
     "parser": "@typescript-eslint/parser",
+    "plugins": [
+        "jest"
+    ],
     "rules": {
         "no-console": "off",
-        "camelcase": "off"
+        "camelcase": "off",
+        "valid-jsdoc": [
+            "error", {
+                "requireParamType": false,
+                "requireReturnType": false
+            }
+        ]
     }
 }
diff --git a/scrapbox/index.test.ts b/scrapbox/index.test.ts
index ef0c0760..63cbb451 100644
--- a/scrapbox/index.test.ts
+++ b/scrapbox/index.test.ts
@@ -1,23 +1,35 @@
-jest.mock('axios');
-
-import scrapbox from './index';
-// @ts-ignore
-import Slack from '../lib/slackMock.js';
-import axios from 'axios';
 import qs from 'querystring';
-
+import axios from 'axios';
 // @ts-ignore
-axios.response = {data: {title: 'hoge', descriptions: ['fuga', 'piyo']}};
+import Slack from '../lib/slackMock.js';
 
 let slack: Slack = null;
 
-beforeEach(async () => {
-	slack = new Slack();
-	process.env.CHANNEL_SANDBOX = slack.fakeChannel;
-	await scrapbox(slack);
-});
+const projectName = 'PROJECTNAME';
+process.env.SCRAPBOX_PROJECT_NAME = projectName;
+
+
+// eslint-disable-next-line import/first, import/imports-first, import/order
+import {Page, PageInfo} from '../lib/scrapbox';
+// eslint-disable-next-line import/first, import/imports-first
+import scrapbox from './index';
+
+describe('unfurl', () => {
+	let fetchInfoSpy: jest.SpyInstance<Promise<PageInfo>> | null = null;
+
+	beforeEach(async () => {
+		fetchInfoSpy = jest.spyOn(Page.prototype, 'fetchInfo')
+			.mockImplementation(() => Promise.resolve({title: 'hoge', descriptions: ['fuga', 'piyo']} as PageInfo));
+		// cast this because it is too demanding to completely write down all properties
+		slack = new Slack();
+		process.env.CHANNEL_SANDBOX = slack.fakeChannel;
+		await scrapbox(slack);
+	});
+
+	afterEach(() => {
+		fetchInfoSpy!.mockRestore();
+	});
 
-describe('scrapbox', () => {
 	it('respond to slack hook of scrapbox unfurling', async () => {
 		const done = new Promise((resolve) => {
 			// @ts-ignore
@@ -25,13 +37,12 @@ describe('scrapbox', () => {
 				if (url === 'https://slack.com/api/chat.unfurl') {
 					const parsed = qs.parse(data);
 					const unfurls = JSON.parse(Array.isArray(parsed.unfurls) ? parsed.unfurls[0] : parsed.unfurls);
-					expect(unfurls['https://scrapbox.io/tsg/hoge']).toBeTruthy();
-					expect(unfurls['https://scrapbox.io/tsg/hoge'].text).toBe('fuga\npiyo');
+					expect(unfurls[`https://scrapbox.io/${projectName}/hoge`]).toBeTruthy();
+					expect(unfurls[`https://scrapbox.io/${projectName}/hoge`].text).toBe('fuga\npiyo');
 					resolve();
 					return Promise.resolve({data: {ok: true}});
 				}
-				// @ts-ignore
-				return Promise.resolve(axios.response);
+				throw Error(`axios-mock: unknown URL: ${url}`);
 			});
 		});
 
@@ -44,7 +55,7 @@ describe('scrapbox', () => {
 			links: [
 				{
 					domain: 'scrapbox.io',
-					url: 'https://scrapbox.io/tsg/hoge',
+					url: `https://scrapbox.io/${projectName}/hoge`,
 				},
 			],
 		});
diff --git a/scrapbox/index.ts b/scrapbox/index.ts
index 96ff948c..2457f829 100644
--- a/scrapbox/index.ts
+++ b/scrapbox/index.ts
@@ -1,12 +1,10 @@
+import qs from 'querystring';
+import {LinkUnfurls} from '@slack/client';
 import axios from 'axios';
 // @ts-ignore
 import logger from '../lib/logger.js';
-import {LinkUnfurls} from '@slack/client';
+import {Page, tsgProjectName} from '../lib/scrapbox';
 import type {SlackInterface} from '../lib/slack';
-import qs from 'querystring';
-
-const getScrapboxUrl = (pageName: string) => `https://scrapbox.io/api/pages/tsg/${pageName}`;
-
 
 export default async ({rtmClient: rtm, webClient: slack, eventClient: event}: SlackInterface) => {
 	event.on('link_shared', async (e: any) => {
@@ -16,18 +14,16 @@ export default async ({rtmClient: rtm, webClient: slack, eventClient: event}: Sl
 		const unfurls: LinkUnfurls = {};
 		for (const link of links) {
 			const {url} = link;
-			if (!(/^https?:\/\/scrapbox.io\/tsg\/.+/).test(url)) {
+			let page: Page | null = null;
+			try {
+				page = new Page({url});
+			} catch {
 				continue;
 			}
-			let pageName = url.replace(/^https?:\/\/scrapbox.io\/tsg\/(.+)$/, '$1');
-			try {
-				if (decodeURI(pageName) === pageName) {
-					pageName = encodeURI(pageName);
-				}
-			} catch {}
-			const scrapboxUrl = getScrapboxUrl(pageName);
-			const response = await axios.get(scrapboxUrl, {headers: {Cookie: `connect.sid=${process.env.SCRAPBOX_SID}`}});
-			const {data} = response;
+			if (page.projectName !== tsgProjectName) {
+				continue;
+			}
+			const data = await page.fetchInfo();
 
 			unfurls[url] = {
 				title: data.title,
diff --git a/scrapbox/mute.test.ts b/scrapbox/mute.test.ts
new file mode 100644
index 00000000..68b3b8fa
--- /dev/null
+++ b/scrapbox/mute.test.ts
@@ -0,0 +1,186 @@
+import EventEmitter from 'events';
+import {MessageAttachment} from '@slack/client';
+import {WebClient} from '@slack/web-api';
+import {flatten, set, sum} from 'lodash';
+import {fastifyDevConstructor} from '../lib/fastify';
+// @ts-ignore
+import Slack from '../lib/slackMock.js';
+
+const projectName = 'PROJECTNAME';
+process.env.SCRAPBOX_PROJECT_NAME = projectName;
+
+// eslint-disable-next-line import/first, import/imports-first, import/order
+import {Page, PageInfo} from '../lib/scrapbox';
+// eslint-disable-next-line import/first, import/imports-first
+import {maskAttachments, reconstructAttachments, server, muteTag, splitAttachments} from './mute';
+import { FastifyInstance } from 'fastify';
+
+class FakeAttachmentGenerator {
+	i: number = 0;
+
+	j: number = 0;
+
+	get(kind: 'text' | 'img'): MessageAttachment {
+		let a: MessageAttachment & { [key: string]: any } | null = null;
+		switch (kind) {
+			case 'text': {
+				const text = `page ${this.i}`;
+				a = {
+					title: `タイトル ${this.i}`,
+					title_link: `https://scrapbox.io/${projectName}/${encodeURIComponent(`タイトル_${this.i}`)}#hash_${this.i}`,
+					text,
+					rawText: text,
+					mrkdwn_in: ['text' as const],
+					author_name: `user ${this.i}`,
+					image_url: `https://example.com/image_${this.i}.png`,
+					thumb_url: `https://example.com/thumb_${this.i}.png`,
+				};
+				++this.i;
+				break;
+			}
+			case 'img': {
+				a = {
+					image_url: `https://example.com/image_${this.i}_${this.j}.png`,
+				};
+				++this.j;
+				break;
+			}
+			default: {
+				a = kind;
+			}
+		}
+		return a;
+	}
+
+	reset() {
+		this.i = 0;
+		this.j = 0;
+	}
+}
+
+const waitEvent = <T>(eventEmitter: EventEmitter, event: string): Promise<T> => new Promise((resolve) => {
+	eventEmitter.once(event, (args) => {
+		resolve(args);
+	});
+});
+
+describe('mute notification', () => {
+	describe('splitAttachments', () => {
+		it('splits attachments to each pages', () => {
+			const gen = new FakeAttachmentGenerator();
+			const attachments = (['text', 'img', 'img', 'text', 'text', 'img'] as const).map((s) => gen.get(s));
+			gen.reset();
+			// eslint-disable-next-line array-plural/array-plural
+			const expected = [{
+				text: gen.get('text'),
+				images: [gen.get('img'), gen.get('img')],
+			}, {
+				text: gen.get('text'),
+				images: [],
+			}, {
+				text: gen.get('text'),
+				images: [gen.get('img')],
+			}];
+			const actual = splitAttachments(attachments);
+			expect(actual).toMatchObject(expected);
+			for (const {images} of actual) {
+				for (const attachment of images) {
+					expect(attachment.text).toBe('');
+				}
+			}
+		});
+	});
+
+	describe('maskAttachments', () => {
+		it('conceals values of notification', () => {
+			const gen = new FakeAttachmentGenerator();
+			const notification = {
+				text: gen.get('text'),
+				images: [gen.get('img'), gen.get('img')],
+			};
+			const attachments = maskAttachments(notification);
+			expect(attachments.length).toBe(1);
+			const [attachment] = attachments;
+			expect(attachment.text).toContain('ミュート');
+			const unchanged = ['title', 'title_link', 'mrkdwn_in', 'author_name'] as const;
+			const nulled = ['image_url', 'thumb_url'] as const;
+			for (const key of unchanged) {
+				expect(attachment[key]).toEqual(notification.text[key]);
+			}
+			for (const key of nulled) {
+				expect(attachment[key]).toBeNull();
+			}
+		});
+	});
+
+	describe('reconstructAttachments', () => {
+		it('restores original attachment parsed by splitAttachments', () => {
+			const gen = new FakeAttachmentGenerator();
+			const attachments = [gen.get('text'), gen.get('img'), gen.get('img')];
+			const [notification] = splitAttachments(attachments);
+			const res = reconstructAttachments(notification);
+			expect(res).toMatchObject(attachments);
+		});
+	});
+
+	describe('server', () => {
+		const fakeChannel = 'CSCRAPBOX';
+		let fastify: FastifyInstance | null = null;
+		let slack: Slack | null = null;
+
+		beforeAll(() => {
+			process.env.CHANNEL_SCRAPBOX = fakeChannel;
+		});
+
+		beforeEach(() => {
+			slack = new Slack();
+			fastify = fastifyDevConstructor();
+			fastify.register(server(slack));
+		});
+
+		it(`mutes pages with ${muteTag} tag`, async () => {
+			// eslint-disable-next-line array-plural/array-plural
+			const isMuted = [true, false];
+			const fetchInfoSpy = jest.spyOn(Page.prototype, 'fetchInfo').mockImplementation(
+				() => Promise.resolve(set(
+					{},
+					['relatedPages', 'links1hop'],
+					isMuted.map((b, i) => ({b, i})).filter(({b}) => b).map(({i}) => ({titleLc: `タイトル_${i}`})),
+				) as PageInfo),
+				// cast this because it is too demanding to completely write down all properties
+			);
+			const gen = new FakeAttachmentGenerator();
+
+			const separatedAttachments = [[
+				gen.get('text'),
+				gen.get('img'),
+				gen.get('img'),
+			], [
+				gen.get('text'),
+				gen.get('img'),
+			]];
+
+			const args = {
+				text: `New lines on <https://scrapbox.io/${projectName}|${projectName}>`,
+				mrkdwn: true,
+				username: 'Scrapbox',
+				attachments: flatten(separatedAttachments),
+			};
+			const messagePromise = waitEvent<Parameters<WebClient['chat']['postMessage']>[0]>(slack, 'chat.postMessage');
+			await fastify.inject({
+				method: 'POST',
+				url: '/hooks/scrapbox',
+				payload: args,
+			});
+
+			const {channel, text, attachments: resultAttachment} = await messagePromise;
+			expect(channel).toBe(fakeChannel);
+			expect(text).toBe(args.text);
+			expect(resultAttachment.length).toBe(
+				sum(separatedAttachments.map((a, i) => isMuted[i] ? 1 : a.length)),
+			);
+
+			fetchInfoSpy!.mockRestore();
+		});
+	});
+});
diff --git a/scrapbox/mute.ts b/scrapbox/mute.ts
new file mode 100644
index 00000000..8d5d0e45
--- /dev/null
+++ b/scrapbox/mute.ts
@@ -0,0 +1,105 @@
+import {WebClient, RTMClient, MessageAttachment} from '@slack/client';
+import plugin from 'fastify-plugin';
+import {flatten, zip} from 'lodash';
+// @ts-ignore
+import {Page, pageUrlRegExp} from '../lib/scrapbox';
+
+interface SlackInterface {
+	rtmClient: RTMClient,
+	webClient: WebClient,
+	eventClient: any,
+}
+
+/**
+ * 1つのScrapbox記事に関する通知を表すオブジェクト
+ * @property text: 文章の更新についてのattachment
+ * @property images: 添付画像のattachment[]
+ */
+interface ScrapboxPageNotification {
+	text: MessageAttachment,
+	images: MessageAttachment[],
+}
+
+/**
+ * Scrapboxからの通知attachments全体を記事ごとに分け，通知オブジェクトに変換
+ * @param attachments: 複数の記事に関するattachments
+ * @returns 通知オブジェクトの配列
+ */
+export const splitAttachments = (attachments: MessageAttachment[]): ScrapboxPageNotification[] => {
+	const pageIndices = attachments
+		.map(({title_link}, i) => ({url: title_link, i}))
+		.filter(({url}) => pageUrlRegExp.test(url))
+		.map(({i}) => i);
+	const pageRange = zip(pageIndices, pageIndices.concat([attachments.length]).slice(1));
+	return pageRange.map(([i, j]) => ({
+		text: attachments[i],
+		images: attachments.slice(i + 1, j).map((a) => ({text: '', ...a})),
+	}));
+};
+
+/**
+ * ミュートしたい記事に対し，隠したい情報を消したattachmentsを生成
+ * 文章の更新は一部を隠した上で返し，画像の更新は全て消す
+ * @param notification ミュートしたい記事の通知オブジェクト
+ * @return ミュート済みのattachments
+ */
+export const maskAttachments = (notification: ScrapboxPageNotification): MessageAttachment[] => {
+	const dummyText = 'この記事の更新通知はミュートされています。';
+	return [{
+		...notification.text,
+		text: dummyText,
+		fallback: dummyText,
+		image_url: null,
+		thumb_url: null,
+	}];
+};
+
+/**
+ * 記事の通知オブジェクトをそのままattachments形式に変換
+ * @param notification 変換する記事の通知オブジェクト
+ * @return 変換されたattachments
+ */
+export const reconstructAttachments = (notification: ScrapboxPageNotification): MessageAttachment[] => [notification.text, ...notification.images];
+
+export const muteTag = '##ミュート';
+const getMutedList = async (): Promise<Set<string>> => {
+	const muteTagPage = new Page({titleLc: muteTag, isEncoded: false});
+	return new Set((await muteTagPage.fetchInfo()).relatedPages.links1hop.map(({titleLc}) => titleLc));
+};
+
+interface SlackIncomingWebhookRequest {
+	text: string;
+	mrkdwn?: boolean;
+	username?: string;
+	attachments: MessageAttachment[];
+}
+
+/**
+ * Scrapboxからの更新通知 (Incoming Webhook形式) を受け取り，ミュート処理をしてSlackに投稿する
+ */
+// for developers: 実際に動かすのは手間がかかるので，fastify.inject などで動作確認するのがおすすめです。mute.test.ts 参照
+
+// eslint-disable-next-line node/no-unsupported-features, node/no-unsupported-features/es-syntax
+export const server = ({webClient: slack}: SlackInterface) => plugin((fastify, opts, next) => {
+	fastify.post<unknown, unknown, unknown, SlackIncomingWebhookRequest>('/hooks/scrapbox', async (req) => {
+		const mutedList = await getMutedList();
+		const attachments = flatten(
+			splitAttachments(req.body.attachments).map(
+				(notification) => mutedList.has(new Page({url: notification.text.title_link}).titleLc)
+					? maskAttachments(notification)
+					: reconstructAttachments(notification),
+			),
+		);
+		await slack.chat.postMessage(
+			{
+				channel: process.env.CHANNEL_SCRAPBOX,
+				icon_emoji: ':scrapbox:',
+				...req.body,
+				attachments,
+			},
+		);
+		return '';
+	});
+
+	next();
+});
diff --git a/welcome/index.ts b/welcome/index.ts
index e2139b0d..835c7d14 100644
--- a/welcome/index.ts
+++ b/welcome/index.ts
@@ -1,15 +1,14 @@
 import axios from 'axios';
+import {WebClient} from '@slack/client';
 // @ts-ignore
 import logger from '../lib/logger.js';
 
-const welcomeScrapboxUrl = `https://scrapbox.io/api/pages/tsg/welcome`;
-
-import {WebClient} from '@slack/client';
+import {Page} from '../lib/scrapbox';
 import type {SlackInterface} from '../lib/slack';
 
 async function postWelcomeMessage(slack: WebClient, channel: string) {
-	const {data} = await axios.get(welcomeScrapboxUrl, {headers: {Cookie: `connect.sid=${process.env.SCRAPBOX_SID}`}});
-	const text = data.lines.map(({text}: {text: string}) => text).slice(1).join('\n');
+	const welcomePage = new Page({ titleLc: 'welcome', isEncoded: false });
+	const text = (await welcomePage.fetchInfo()).lines.map(({text}: {text: string}) => text).slice(1).join('\n');
 
 	return slack.chat.postMessage({
 		channel,