diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 443467a..2af06f6 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -40,6 +40,8 @@ jobs:
         run: npm ci
       - name: Typecheck
         run: npm run typecheck
+      - name: Lint
+        run: npm run lint
       - name: Unit tests
         run: npm test
       - name: Build
diff --git a/README.md b/README.md
index b0a8ace..4099db1 100644
--- a/README.md
+++ b/README.md
@@ -216,7 +216,7 @@ See `docs/OUTLINE.md`.
 2. Update `CHANGELOG.md` with a `## X.Y.Z` section (the release job extracts this verbatim as release notes)
 3. Tag `vX.Y.Z` and push
 
-Pushing the tag triggers `.gitea/workflows/ci.yml`'s `release` job: it re-runs typecheck/test/build, verifies the tag matches `package.json`'s `version` and that `CHANGELOG.md` documents it, then creates a Gitea release (with the `npm pack` tarball attached) via the API using a repo-scoped `RELEASE_TOKEN` Actions secret. If any check fails, no release is created — fix and re-tag. Consumers still pin the git tag (`#vX.Y.Z`); the Gitea release is for visibility/changelog, not an npm registry publish (see ROADMAP "private Gitea npm registry").
+Pushing the tag triggers `.gitea/workflows/ci.yml`'s `release` job: it re-runs typecheck/test/build, verifies the tag matches `package.json`'s `version` and that `CHANGELOG.md` documents it, then (a) creates a Gitea release with the `npm pack` tarball attached (via `RELEASE_TOKEN`) and (b) **publishes the package to the Gitea npm registry** (`https://git.levkin.ca/api/packages/ilia/npm/`, via `NPM_PUBLISH_TOKEN`, falling back to `RELEASE_TOKEN`). If any check fails, nothing is released or published — fix and re-tag. Consumers install from the registry (`npm install @levkin/playkit@X.Y.Z`, see `docs/NPM_REGISTRY.md`) or pin the git tag (`#vX.Y.Z`) as a fallback.
 
 4. **Update Outline** — `python3 scripts/outline-sync-playkit.py` (checklist: `docs/OUTLINE.md`).
 
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..d8e50d4
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,31 @@
+// Flat ESLint config — lint the library source (`npx eslint src`).
+// Typecheck stays separate (`npm run typecheck`); this catches what tsc doesn't.
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import globals from 'globals';
+
+export default tseslint.config(
+  {
+    ignores: ['dist/', 'node_modules/', 'playwright-report/', 'test-results/', 'selftest/demo-site/'],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    files: ['src/**/*.ts'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        // Browser globals for code evaluated inside the page (persistentSession, richText).
+        ...globals.browser,
+      },
+    },
+    rules: {
+      // The kit wraps Playwright objects whose shapes we don't own; `any` is
+      // still banned by default — allow unused args prefixed with `_`.
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrors: 'none' },
+      ],
+    },
+  },
+);
diff --git a/package-lock.json b/package-lock.json
index c6f9f29..b16333f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,22 +1,29 @@
 {
   "name": "@levkin/playkit",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@levkin/playkit",
-      "version": "0.3.1",
+      "version": "0.4.0",
       "license": "MIT",
       "dependencies": {
         "zod": "^3.24.0"
       },
+      "bin": {
+        "playkit": "dist/cli.js"
+      },
       "devDependencies": {
-        "@playwright/test": "^1.52.0",
+        "@eslint/js": "^10.0.1",
+        "@playwright/test": "1.61.1",
         "@types/node": "^22.15.0",
+        "eslint": "^10.8.0",
+        "globals": "^17.8.0",
         "tsup": "^8.4.0",
         "tsx": "^4.19.0",
         "typescript": "^5.8.0",
+        "typescript-eslint": "^8.65.0",
         "vitest": "^3.1.0"
       },
       "engines": {
@@ -473,6 +480,200 @@
         "node": ">=18"
       }
     },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+      "integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+      "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.2",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+      "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      }
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+    "node_modules/@eslint/config-array": {
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+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.23.5.tgz",
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+      "dev": true,
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+      "dependencies": {
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+        "debug": "^4.3.1",
+        "minimatch": "^10.2.4"
+      },
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+      }
+    },
+    "node_modules/@eslint/config-helpers": {
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+        "eslint": {
+          "optional": true
+        }
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+        "@humanfs/types": "^0.15.0"
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+      "dependencies": {
+        "@humanfs/core": "^0.19.2",
+        "@humanfs/types": "^0.15.0",
+        "@humanwhocodes/retry": "^0.4.0"
+      },
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanfs/types": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@humanfs/types/-/types-0.15.0.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanwhocodes/module-importer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
+      "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=12.22"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@humanwhocodes/retry": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
+      "integrity": "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -935,6 +1136,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/esrecurse": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/@types/esrecurse/-/esrecurse-4.3.1.tgz",
+      "integrity": "sha512-xJBAbDifo5hpffDBuHl0Y8ywswbiAp/Wi7Y/GtAgSlZyIABppyurxVueOPE8LUQOxdlgi6Zqce7uoEpqNTeiUw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/estree": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
@@ -942,6 +1150,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/json-schema": {
+      "version": "7.0.15",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
+      "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "22.20.1",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-22.20.1.tgz",
@@ -952,6 +1167,236 @@
         "undici-types": "~6.21.0"
       }
     },
+    "node_modules/@typescript-eslint/eslint-plugin": {
+      "version": "8.65.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.65.0.tgz",
+      "integrity": "sha512-IEgob78X12rHpUmtcwFsXhZdVGJtwTVP8FiCLZkR6GlYVrl2PcuB+KhCE5BlVC/eQpQnu8WXRtkHZuPar+gCRA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@eslint-community/regexpp": "^4.12.2",
+        "@typescript-eslint/scope-manager": "8.65.0",
+        "@typescript-eslint/type-utils": "8.65.0",
+        "@typescript-eslint/utils": "8.65.0",
+        "@typescript-eslint/visitor-keys": "8.65.0",
+        "ignore": "^7.0.5",
+        "natural-compare": "^1.4.0",
+        "ts-api-utils": "^2.5.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "@typescript-eslint/parser": "^8.65.0",
+        "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0",
+        "typescript": ">=4.8.4 <6.1.0"
+      }
+    },
+    "node_modules/@typescript-eslint/eslint-plugin/node_modules/ignore": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-7.0.6.tgz",
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+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/zod": {
       "version": "3.25.76",
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
diff --git a/package.json b/package.json
index 2f24575..1b4cfd6 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "test": "vitest run",
     "test:watch": "vitest",
     "selftest": "playwright test -c selftest/playwright.config.ts",
-    "lint": "tsc --noEmit",
+    "lint": "eslint src",
     "prepublishOnly": "npm run build",
     "example:api": "tsx examples/api/health.example.ts"
   },
@@ -64,11 +64,15 @@
     }
   },
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@playwright/test": "1.61.1",
     "@types/node": "^22.15.0",
+    "eslint": "^10.8.0",
+    "globals": "^17.8.0",
     "tsup": "^8.4.0",
     "tsx": "^4.19.0",
     "typescript": "^5.8.0",
+    "typescript-eslint": "^8.65.0",
     "vitest": "^3.1.0"
   },
   "engines": {
diff --git a/src/browser/actions.test.ts b/src/browser/actions.test.ts
new file mode 100644
index 0000000..13c2f2b
--- /dev/null
+++ b/src/browser/actions.test.ts
@@ -0,0 +1,166 @@
+import { describe, expect, it, vi } from 'vitest';
+import type { Locator, Page } from '@playwright/test';
+import type { Logger } from '../logging/logger.js';
+import {
+  BasePage,
+  assertPublicHost,
+  click,
+  fill,
+  safeGoto,
+  waitForUrlHost,
+} from './actions.js';
+
+const silentLogger: Logger = {
+  debug: () => undefined,
+  info: () => undefined,
+  warn: () => undefined,
+  error: () => undefined,
+  child: () => silentLogger,
+};
+
+function mockLocator(overrides: Partial<Record<'waitFor' | 'click' | 'fill', unknown>> = {}) {
+  return {
+    waitFor: vi.fn(async () => undefined),
+    click: vi.fn(async () => undefined),
+    fill: vi.fn(async () => undefined),
+    ...overrides,
+  } as unknown as Locator;
+}
+
+describe('click', () => {
+  it('waits for visibility then clicks with the given options', async () => {
+    const locator = mockLocator();
+    await click(locator, { timeout: 5_000, force: true, logger: silentLogger });
+    expect(locator.waitFor).toHaveBeenCalledWith({ state: 'visible', timeout: 5_000 });
+    expect(locator.click).toHaveBeenCalledWith({ timeout: 5_000, force: true, trial: undefined });
+  });
+
+  it('retries after a failed attempt and succeeds', async () => {
+    const clickFn = vi
+      .fn()
+      .mockRejectedValueOnce(new Error('intercepted'))
+      .mockResolvedValueOnce(undefined);
+    const locator = mockLocator({ click: clickFn });
+    await click(locator, { retries: 1, logger: silentLogger });
+    expect(clickFn).toHaveBeenCalledTimes(2);
+  });
+
+  it('throws the last error once retries are exhausted', async () => {
+    const clickFn = vi.fn().mockRejectedValue(new Error('detached'));
+    const locator = mockLocator({ click: clickFn });
+    await expect(click(locator, { retries: 1, logger: silentLogger })).rejects.toThrow('detached');
+    expect(clickFn).toHaveBeenCalledTimes(2);
+  });
+});
+
+describe('fill', () => {
+  it('clears the field before filling by default', async () => {
+    const locator = mockLocator();
+    await fill(locator, 'hello', { logger: silentLogger });
+    const fillMock = locator.fill as ReturnType<typeof vi.fn>;
+    expect(fillMock).toHaveBeenCalledTimes(2);
+    expect(fillMock.mock.calls[0]).toEqual(['']);
+    expect(fillMock.mock.calls[1][0]).toBe('hello');
+  });
+
+  it('skips the clear step when clear: false', async () => {
+    const locator = mockLocator();
+    await fill(locator, 'hello', { clear: false, logger: silentLogger });
+    const fillMock = locator.fill as ReturnType<typeof vi.fn>;
+    expect(fillMock).toHaveBeenCalledTimes(1);
+    expect(fillMock.mock.calls[0][0]).toBe('hello');
+  });
+});
+
+describe('safeGoto', () => {
+  it('navigates with the configured waitUntil and retries transient failures', async () => {
+    const goto = vi
+      .fn()
+      .mockRejectedValueOnce(new Error('net::ERR_CONNECTION_RESET'))
+      .mockResolvedValueOnce(undefined);
+    const page = { goto } as unknown as Page;
+    await safeGoto(page, 'https://app.levkin.ca/login', {
+      retries: 1,
+      waitUntil: 'load',
+      logger: silentLogger,
+    });
+    expect(goto).toHaveBeenCalledTimes(2);
+    expect(goto).toHaveBeenLastCalledWith('https://app.levkin.ca/login', {
+      timeout: 60_000,
+      waitUntil: 'load',
+    });
+  });
+});
+
+describe('waitForUrlHost', () => {
+  it('resolves when the page URL is already on the expected host', async () => {
+    const page = { url: () => 'https://app.levkin.ca/dashboard' } as unknown as Page;
+    await expect(
+      waitForUrlHost(page, 'app.levkin.ca', { logger: silentLogger }),
+    ).resolves.toBeUndefined();
+  });
+
+  it('throws a descriptive error naming both hosts when the host never matches', async () => {
+    const page = { url: () => 'http://10.0.10.45:3000/dashboard' } as unknown as Page;
+    await expect(
+      waitForUrlHost(page, 'app.levkin.ca', { timeout: 0, logger: silentLogger }),
+    ).rejects.toThrow(/Expected URL host "app\.levkin\.ca" but got "10\.0\.10\.45"/);
+  });
+});
+
+describe('assertPublicHost', () => {
+  it('accepts a public URL and a bare public hostname', () => {
+    expect(() => assertPublicHost('https://punimtagdev.levkin.ca/login')).not.toThrow();
+    expect(() => assertPublicHost('punimtagdev.levkin.ca')).not.toThrow();
+  });
+
+  it.each(['https://10.0.10.45:3000', 'http://localhost:3000', 'https://192.168.1.10', '127.0.0.1'])(
+    'rejects private host %s',
+    (input) => {
+      expect(() => assertPublicHost(input)).toThrow(/Refusing private host/);
+    },
+  );
+
+  it('allows private hosts when forbidPrivate is false (intentional LAN runs)', () => {
+    expect(() => assertPublicHost('http://10.0.10.45:3000', false)).not.toThrow();
+  });
+});
+
+describe('BasePage', () => {
+  function makePage(url = 'https://app.levkin.ca/') {
+    const goto = vi.fn(async () => undefined);
+    const page = { goto, url: () => url } as unknown as Page;
+    return { page, goto };
+  }
+
+  it('open() joins base URL and path without doubling slashes', async () => {
+    const { page, goto } = makePage();
+    const basePage = new BasePage(page, 'https://app.levkin.ca/', silentLogger);
+    await basePage.open('/users');
+    expect(goto).toHaveBeenCalledWith('https://app.levkin.ca/users', expect.anything());
+  });
+
+  it('open() adds the missing leading slash for relative paths', async () => {
+    const { page, goto } = makePage();
+    const basePage = new BasePage(page, 'https://app.levkin.ca', silentLogger);
+    await basePage.open('users');
+    expect(goto).toHaveBeenCalledWith('https://app.levkin.ca/users', expect.anything());
+  });
+
+  it('open() passes absolute http(s) URLs through untouched', async () => {
+    const { page, goto } = makePage();
+    const basePage = new BasePage(page, 'https://app.levkin.ca', silentLogger);
+    await basePage.open('https://other.levkin.ca/health');
+    expect(goto).toHaveBeenCalledWith('https://other.levkin.ca/health', expect.anything());
+  });
+
+  it('click() and fill() delegate to the retried helpers', async () => {
+    const { page } = makePage();
+    const basePage = new BasePage(page, 'https://app.levkin.ca', silentLogger);
+    const locator = mockLocator();
+    await basePage.click(locator);
+    await basePage.fill(locator, 'value');
+    expect(locator.click).toHaveBeenCalledTimes(1);
+    expect(locator.fill).toHaveBeenCalledWith('value', { timeout: 30_000 });
+  });
+});
diff --git a/src/logging/redact.test.ts b/src/logging/redact.test.ts
new file mode 100644
index 0000000..b1422bb
--- /dev/null
+++ b/src/logging/redact.test.ts
@@ -0,0 +1,57 @@
+import { describe, expect, it } from 'vitest';
+import { redactSecrets } from './redact.js';
+
+describe('redactSecrets', () => {
+  it('redacts common secret keys while leaving other fields intact', () => {
+    const input = {
+      user: 'ilia',
+      password: 'hunter2',
+      apiKey: 'abc123',
+      api_key: 'abc123',
+      authorization: 'token xyz',
+      cookie: 'session=deadbeef',
+      count: 3,
+    };
+    expect(redactSecrets(input)).toEqual({
+      user: 'ilia',
+      password: '[REDACTED]',
+      apiKey: '[REDACTED]',
+      api_key: '[REDACTED]',
+      authorization: '[REDACTED]',
+      cookie: '[REDACTED]',
+      count: 3,
+    });
+  });
+
+  it('redacts nested objects and arrays', () => {
+    const input = {
+      requests: [
+        { url: '/login', headers: { Authorization: 'Bearer abc.def' } },
+        { url: '/users', headers: { Accept: 'application/json' } },
+      ],
+      config: { db: { passWord: 'pg-secret' } },
+    };
+    const out = redactSecrets(input);
+    expect(out.requests[0].headers.Authorization).toBe('[REDACTED]');
+    expect(out.requests[1].headers.Accept).toBe('application/json');
+    expect(out.config.db.passWord).toBe('[REDACTED]');
+    expect(out.requests[0].url).toBe('/login');
+  });
+
+  it('redacts Bearer tokens embedded in free-text strings', () => {
+    expect(redactSecrets('request sent with Bearer fake.token-value_1 attached')).toBe(
+      'request sent with Bearer [REDACTED] attached',
+    );
+  });
+
+  it('leaves empty-string secret values alone (nothing to leak)', () => {
+    expect(redactSecrets({ token: '' })).toEqual({ token: '' });
+  });
+
+  it('passes through null, undefined, and primitives', () => {
+    expect(redactSecrets(null)).toBeNull();
+    expect(redactSecrets(undefined)).toBeUndefined();
+    expect(redactSecrets(42)).toBe(42);
+    expect(redactSecrets('no secrets here')).toBe('no secrets here');
+  });
+});
diff --git a/src/mail/index.ts b/src/mail/index.ts
index bdd235f..b77afb2 100644
--- a/src/mail/index.ts
+++ b/src/mail/index.ts
@@ -4,7 +4,6 @@
 import { createLogger, type Logger } from '../logging/logger.js';
 import { MailpitClient, loadMailpitConfig } from './mailpit.js';
 import { MailtrapClient, loadMailtrapConfig } from './mailtrap.js';
-import { extractLinks, firstLinkMatching } from './mailtrap.js';
 
 export type MailInbox = MailpitClient | MailtrapClient;