diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 75e57af..aa49d18 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,8 +27,8 @@ jobs:
       - name: Lint
         run: npm run lint
 
-      - name: Run tests
-        run: npm test
+      - name: Run tests with coverage
+        run: npm run test:coverage
 
       - name: Check formatting
         run: npx prettier --check 'src/**/*.ts' '*.json' '.prettierrc'
diff --git a/.gitignore b/.gitignore
index ef909f4..77cdef5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 .vscode
 dist
 node_modules
+coverage
diff --git a/package-lock.json b/package-lock.json
index e87d2c4..bf80a4c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,6 +19,7 @@
       "devDependencies": {
         "@eslint/js": "^9.39.2",
         "@types/node": "^25.0.10",
+        "@vitest/coverage-v8": "^4.0.18",
         "eslint": "^9.39.2",
         "eslint-config-prettier": "^10.1.8",
         "prettier": "^3.5.3",
@@ -30,6 +31,66 @@
         "node": ">=18.0.0"
       }
     },
+    "node_modules/@babel/helper-string-parser": {
+      "version": "7.27.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.27.1.tgz",
+      "integrity": "sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.28.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.28.5.tgz",
+      "integrity": "sha512-qSs4ifwzKJSV39ucNjsvc6WVHs6b7S03sOh2OcHF9UHfVPqWWALUsNUVzhSBiItjRZoLHx7nIarVjqKVusUZ1Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/parser": {
+      "version": "7.28.6",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.28.6.tgz",
+      "integrity": "sha512-TeR9zWR18BvbfPmGbLampPMW+uW1NZnJlRuuHso8i87QZNq2JRF9i6RgxRqtEq+wQGsS19NNTWr2duhnE49mfQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/types": "^7.28.6"
+      },
+      "bin": {
+        "parser": "bin/babel-parser.js"
+      },
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@babel/types": {
+      "version": "7.28.6",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.6.tgz",
+      "integrity": "sha512-0ZrskXVEHSWIqZM/sQZ4EV3jZJXRkio/WCxaqKZP1g//CEWEPSfeZFcms4XeKBCHU0ZKnIkdJeU/kF+eRp5lBg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-string-parser": "^7.27.1",
+        "@babel/helper-validator-identifier": "^7.28.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/aix-ppc64": {
       "version": "0.27.2",
       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.2.tgz",
@@ -704,6 +765,16 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
     "node_modules/@jridgewell/sourcemap-codec": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
@@ -711,6 +782,17 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.31",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
+      "integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.1.0",
+        "@jridgewell/sourcemap-codec": "^1.4.14"
+      }
+    },
     "node_modules/@modelcontextprotocol/sdk": {
       "version": "1.25.3",
       "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.25.3.tgz",
@@ -1414,6 +1496,37 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
+    "node_modules/@vitest/coverage-v8": {
+      "version": "4.0.18",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-4.0.18.tgz",
+      "integrity": "sha512-7i+N2i0+ME+2JFZhfuz7Tg/FqKtilHjGyGvoHYQ6iLV0zahbsJ9sljC9OcFcPDbhYKCet+sG8SsVqlyGvPflZg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@bcoe/v8-coverage": "^1.0.2",
+        "@vitest/utils": "4.0.18",
+        "ast-v8-to-istanbul": "^0.3.10",
+        "istanbul-lib-coverage": "^3.2.2",
+        "istanbul-lib-report": "^3.0.1",
+        "istanbul-reports": "^3.2.0",
+        "magicast": "^0.5.1",
+        "obug": "^2.1.1",
+        "std-env": "^3.10.0",
+        "tinyrainbow": "^3.0.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@vitest/browser": "4.0.18",
+        "vitest": "4.0.18"
+      },
+      "peerDependenciesMeta": {
+        "@vitest/browser": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "4.0.18",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-4.0.18.tgz",
@@ -1627,6 +1740,18 @@
         "node": ">=12"
       }
     },
+    "node_modules/ast-v8-to-istanbul": {
+      "version": "0.3.10",
+      "resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-0.3.10.tgz",
+      "integrity": "sha512-p4K7vMz2ZSk3wN8l5o3y2bJAoZXT3VuJI5OLTATY/01CYWumWvwkUw0SqDBnNq6IiTO3qDa1eSQDibAV8g7XOQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.31",
+        "estree-walker": "^3.0.3",
+        "js-tokens": "^9.0.1"
+      }
+    },
     "node_modules/balanced-match": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -2591,6 +2716,13 @@
         "node": ">=16.9.0"
       }
     },
+    "node_modules/html-escaper": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.2.tgz",
+      "integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/http-errors": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-2.0.1.tgz",
@@ -2714,6 +2846,45 @@
       "integrity": "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==",
       "license": "ISC"
     },
+    "node_modules/istanbul-lib-coverage": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-coverage/-/istanbul-lib-coverage-3.2.2.tgz",
+      "integrity": "sha512-O8dpsF+r0WV/8MNRKfnmrtCWhuKjxrq2w+jpzBL5UZKTi2LeVWnWOmWRxFlesJONmc+wLAGvKQZEOanko0LFTg==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/istanbul-lib-report": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-report/-/istanbul-lib-report-3.0.1.tgz",
+      "integrity": "sha512-GCfE1mtsHGOELCU8e/Z7YWzpmybrx/+dSTfLrvY8qRmaY6zXTKWn6WQIjaAFw069icm6GVMNkgu0NzI4iPZUNw==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "istanbul-lib-coverage": "^3.0.0",
+        "make-dir": "^4.0.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/istanbul-reports": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/istanbul-reports/-/istanbul-reports-3.2.0.tgz",
+      "integrity": "sha512-HGYWWS/ehqTV3xN10i23tkPkpH46MLCIMFNCaaKNavAXTF1RkqxawEPtnjnGZ6XKSInBKkiOA5BKS+aZiY3AvA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "html-escaper": "^2.0.0",
+        "istanbul-lib-report": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/jose": {
       "version": "6.1.3",
       "resolved": "https://registry.npmjs.org/jose/-/jose-6.1.3.tgz",
@@ -2723,6 +2894,13 @@
         "url": "https://github.com/sponsors/panva"
       }
     },
+    "node_modules/js-tokens": {
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-9.0.1.tgz",
+      "integrity": "sha512-mxa9E9ITFOt0ban3j6L5MpjwegGz6lBQmM1IJkWeBZGcMxto50+eWdjC/52xDbS2vy0k7vIMK0Fe2wfL9OQSpQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/js-yaml": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
@@ -2819,6 +2997,34 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
+    "node_modules/magicast": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/magicast/-/magicast-0.5.1.tgz",
+      "integrity": "sha512-xrHS24IxaLrvuo613F719wvOIv9xPHFWQHuvGUBmPnCA/3MQxKI3b+r7n1jAoDHmsbC5bRhTZYR77invLAxVnw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/parser": "^7.28.5",
+        "@babel/types": "^7.28.5",
+        "source-map-js": "^1.2.1"
+      }
+    },
+    "node_modules/make-dir": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-4.0.0.tgz",
+      "integrity": "sha512-hXdUTZYIVOt1Ex//jAQi+wTZZpUpwBj/0QsOzqegb3rGMMeJiSEu5xLHnYfBrRV4RH2+OCSOO95Is/7x1WJ4bw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "semver": "^7.5.3"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/math-intrinsics": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
diff --git a/package.json b/package.json
index 6e3e258..c10be86 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "lint:fix": "eslint src/ --fix",
     "start": "node dist/index.js",
     "test": "vitest run",
+    "test:coverage": "vitest run --coverage",
     "test:watch": "vitest",
     "prepublishOnly": "npm run build"
   },
@@ -45,6 +46,7 @@
   "devDependencies": {
     "@eslint/js": "^9.39.2",
     "@types/node": "^25.0.10",
+    "@vitest/coverage-v8": "^4.0.18",
     "eslint": "^9.39.2",
     "eslint-config-prettier": "^10.1.8",
     "prettier": "^3.5.3",
diff --git a/vitest.config.ts b/vitest.config.ts
index bcbe035..91a46ef 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -5,5 +5,22 @@ export default defineConfig({
     globals: true,
     environment: 'node',
     include: ['src/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+      exclude: [
+        'node_modules/**',
+        'dist/**',
+        'src/**/*.test.ts',
+        'src/test-utils/**',
+        'src/version.ts',
+      ],
+      thresholds: {
+        lines: 80,
+        functions: 80,
+        branches: 80,
+        statements: 80,
+      },
+    },
   },
 });