diff --git a/.gitignore b/.gitignore
index 550f500..a31fe64 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,7 +10,7 @@ dist/
 downloads/
 eggs/
 .eggs/
-lib/
+/lib/
 lib64/
 parts/
 sdist/
diff --git a/AGENTS.md b/AGENTS.md
index c747e21..7fd3594 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -5,16 +5,17 @@ MCP server for Selenium WebDriver browser automation. JavaScript (ES Modules), N
 ## File Map
 
 ```text
-src/lib/server.js      ← ALL server logic: tool definitions, state, helpers, cleanup
-src/index.js           ← Thin CLI wrapper, spawns server.js as child process
-test/mcp-client.mjs    ← Reusable MCP test client (JSON-RPC over stdio)
-test/*.test.mjs        ← Tests grouped by feature
-test/fixtures/*.html   ← HTML files loaded via file:// URLs in tests
+src/lib/server.js                ← ALL server logic: tool definitions, state, helpers, cleanup
+src/lib/accessibility-snapshot.js ← Browser-side JS injected via executeScript to build accessibility tree
+bin/mcp-selenium.js              ← CLI entry point, spawns server.js as child process
+test/mcp-client.mjs              ← Reusable MCP test client (JSON-RPC over stdio)
+test/*.test.mjs                  ← Tests grouped by feature
+test/fixtures/*.html             ← HTML files loaded via file:// URLs in tests
 ```
 
 ## Architecture
 
-**Single-file server** — everything is in `server.js`. 18 tools, 1 resource.
+Server logic lives in `server.js`, with browser-injected scripts in separate files. 18 tools, 2 resources.
 
 State is a module-level object:
 ```js
@@ -80,3 +81,4 @@ Tests talk to the real MCP server over stdio. No mocking. Each test file uses **
 | `tools.test.mjs` | get_element_attribute, execute_script, window, frame, alert |
 | `cookies.test.mjs` | add_cookie, get_cookies, delete_cookie |
 | `bidi.test.mjs` | diagnostics (console/errors/network), session isolation |
+| `resources.test.mjs` | accessibility-snapshot resource (tree structure, filtering, no-session error) |
diff --git a/README.md b/README.md
index 018d93a..8ff7695 100644
--- a/README.md
+++ b/README.md
@@ -224,6 +224,29 @@ Gets browser diagnostics captured via WebDriver BiDi (auto-enabled when supporte
 
 </details>
 
+<details>
+<summary><strong>Resources</strong></summary>
+
+MCP resources provide read-only data that clients can access without calling a tool.
+
+### browser-status://current
+Returns the current browser session status (active session ID or "no active session").
+
+| Property | Value |
+|----------|-------|
+| MIME type | `text/plain` |
+| Requires browser | No |
+
+### accessibility://current
+Returns an accessibility tree snapshot of the current page — a compact, structured JSON representation of interactive elements and text content. Much smaller than full HTML. Useful for understanding page layout and finding elements to interact with.
+
+| Property | Value |
+|----------|-------|
+| MIME type | `application/json` |
+| Requires browser | Yes |
+
+</details>
+
 ---
 
 <details>
diff --git a/package-lock.json b/package-lock.json
index ee3dc75..b66a126 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "0.2.0",
       "license": "ISC",
       "dependencies": {
-        "@modelcontextprotocol/sdk": "^1.7.0",
+        "@modelcontextprotocol/sdk": "^1.26.0",
         "selenium-webdriver": "^4.18.1"
       },
       "bin": {
@@ -22,24 +22,56 @@
       "integrity": "sha512-1uLNT5NZsUVIGS4syuHwTzZ8HycMPyr6POA3FCE4GbMtc4rhoJk8aZKtNIRthJYfL+iioppi+rTfH3olMPr9nA==",
       "license": "Apache-2.0"
     },
+    "node_modules/@hono/node-server": {
+      "version": "1.19.9",
+      "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.9.tgz",
+      "integrity": "sha512-vHL6w3ecZsky+8P5MD+eFfaGTyCeOHUIFYMGpQGbrBTSmNNoxv0if69rEZ5giu36weC5saFuznL411gRX7bJDw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.14.1"
+      },
+      "peerDependencies": {
+        "hono": "^4"
+      }
+    },
     "node_modules/@modelcontextprotocol/sdk": {
-      "version": "1.7.0",
-      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.7.0.tgz",
-      "integrity": "sha512-IYPe/FLpvF3IZrd/f5p5ffmWhMc3aEMuM2wGJASDqC2Ge7qatVCdbfPx3n/5xFeb19xN0j/911M2AaFuircsWA==",
+      "version": "1.26.0",
+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.26.0.tgz",
+      "integrity": "sha512-Y5RmPncpiDtTXDbLKswIJzTqu2hyBKxTNsgKqKclDbhIgg1wgtf1fRuvxgTnRfcnxtvvgbIEcqUOzZrJ6iSReg==",
       "license": "MIT",
       "dependencies": {
+        "@hono/node-server": "^1.19.9",
+        "ajv": "^8.17.1",
+        "ajv-formats": "^3.0.1",
         "content-type": "^1.0.5",
         "cors": "^2.8.5",
+        "cross-spawn": "^7.0.5",
         "eventsource": "^3.0.2",
-        "express": "^5.0.1",
-        "express-rate-limit": "^7.5.0",
-        "pkce-challenge": "^4.1.0",
+        "eventsource-parser": "^3.0.0",
+        "express": "^5.2.1",
+        "express-rate-limit": "^8.2.1",
+        "hono": "^4.11.4",
+        "jose": "^6.1.3",
+        "json-schema-typed": "^8.0.2",
+        "pkce-challenge": "^5.0.0",
         "raw-body": "^3.0.0",
-        "zod": "^3.23.8",
-        "zod-to-json-schema": "^3.24.1"
+        "zod": "^3.25 || ^4.0",
+        "zod-to-json-schema": "^3.25.1"
       },
       "engines": {
         "node": ">=18"
+      },
+      "peerDependencies": {
+        "@cfworker/json-schema": "^4.1.1",
+        "zod": "^3.25 || ^4.0"
+      },
+      "peerDependenciesMeta": {
+        "@cfworker/json-schema": {
+          "optional": true
+        },
+        "zod": {
+          "optional": false
+        }
       }
     },
     "node_modules/accepts": {
@@ -55,62 +87,61 @@
         "node": ">= 0.6"
       }
     },
-    "node_modules/body-parser": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.1.0.tgz",
-      "integrity": "sha512-/hPxh61E+ll0Ujp24Ilm64cykicul1ypfwjVttduAiEdtnJFvLePSrIPk+HMImtNv5270wOGCb1Tns2rybMkoQ==",
+    "node_modules/ajv": {
+      "version": "8.18.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.18.0.tgz",
+      "integrity": "sha512-PlXPeEWMXMZ7sPYOHqmDyCJzcfNrUr3fGNKtezX14ykXOEIvyK81d+qydx89KY5O71FKMPaQ2vBfBFI5NHR63A==",
       "license": "MIT",
       "dependencies": {
-        "bytes": "^3.1.2",
-        "content-type": "^1.0.5",
-        "debug": "^4.4.0",
-        "http-errors": "^2.0.0",
-        "iconv-lite": "^0.5.2",
-        "on-finished": "^2.4.1",
-        "qs": "^6.14.0",
-        "raw-body": "^3.0.0",
-        "type-is": "^2.0.0"
+        "fast-deep-equal": "^3.1.3",
+        "fast-uri": "^3.0.1",
+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2"
       },
-      "engines": {
-        "node": ">=18"
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
       }
     },
-    "node_modules/body-parser/node_modules/debug": {
-      "version": "4.4.0",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.0.tgz",
-      "integrity": "sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==",
+    "node_modules/ajv-formats": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/ajv-formats/-/ajv-formats-3.0.1.tgz",
+      "integrity": "sha512-8iUql50EUR+uUcdRQ3HDqa6EVyo3docL8g5WJ3FNcWmu62IbkGUue/pEyLBW8VGKKucTPgqeks4fIU1DA4yowQ==",
       "license": "MIT",
       "dependencies": {
-        "ms": "^2.1.3"
+        "ajv": "^8.0.0"
       },
-      "engines": {
-        "node": ">=6.0"
+      "peerDependencies": {
+        "ajv": "^8.0.0"
       },
       "peerDependenciesMeta": {
-        "supports-color": {
+        "ajv": {
           "optional": true
         }
       }
     },
-    "node_modules/body-parser/node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "license": "MIT"
-    },
-    "node_modules/body-parser/node_modules/qs": {
-      "version": "6.14.0",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.14.0.tgz",
-      "integrity": "sha512-YWWTjgABSKcvs/nWBi9PycY/JiPJqOD4JA6o9Sej2AtvSGarXxKC3OQSk4pAarbdQlKAh5D4FCQkJNkW+GAn3w==",
-      "license": "BSD-3-Clause",
+    "node_modules/body-parser": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.2.tgz",
+      "integrity": "sha512-oP5VkATKlNwcgvxi0vM0p/D3n2C3EReYVX+DNYs5TjZFn/oQt2j+4sVJtSMr18pdRr8wjTcBl6LoV+FUwzPmNA==",
+      "license": "MIT",
       "dependencies": {
-        "side-channel": "^1.1.0"
+        "bytes": "^3.1.2",
+        "content-type": "^1.0.5",
+        "debug": "^4.4.3",
+        "http-errors": "^2.0.0",
+        "iconv-lite": "^0.7.0",
+        "on-finished": "^2.4.1",
+        "qs": "^6.14.1",
+        "raw-body": "^3.0.1",
+        "type-is": "^2.0.1"
       },
       "engines": {
-        "node": ">=0.6"
+        "node": ">=18"
       },
       "funding": {
-        "url": "https://github.com/sponsors/ljharb"
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
     "node_modules/bytes": {
@@ -152,15 +183,16 @@
       }
     },
     "node_modules/content-disposition": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.0.0.tgz",
-      "integrity": "sha512-Au9nRL8VNUut/XSzbQA38+M78dzP4D+eqg3gfJHMIHHYa3bg067xj1KxMUWj+VULbiZMowKngFFbKczUrNJ1mg==",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.0.1.tgz",
+      "integrity": "sha512-oIXISMynqSqm241k6kcQ5UwttDILMK4BiurCfGEREw6+X9jkkpEe5T9FZaApyLGGOnFuyMWZpdolTXMtvEJ08Q==",
       "license": "MIT",
-      "dependencies": {
-        "safe-buffer": "5.2.1"
-      },
       "engines": {
-        "node": ">= 0.6"
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
     "node_modules/content-type": {
@@ -173,9 +205,9 @@
       }
     },
     "node_modules/cookie": {
-      "version": "0.7.1",
-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.1.tgz",
-      "integrity": "sha512-6DnInpx7SJ2AK3+CTUE/ZM0vWTUboZCegxhC2xiIydHR9jNuTAASBrfEpHhiGOZw/nX51bHt6YQl8jsGo4y/0w==",
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.2.tgz",
+      "integrity": "sha512-yki5XnKuf750l50uGTllt6kKILY4nQ1eNIQatoXEByZ5dWgnKqbnqmTrBE5B4N7lrMJKQ2ytWMiTO2o0v6Ew/w==",
       "license": "MIT",
       "engines": {
         "node": ">= 0.6"
@@ -209,13 +241,27 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/cross-spawn": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
+      "integrity": "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==",
+      "license": "MIT",
+      "dependencies": {
+        "path-key": "^3.1.0",
+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/debug": {
-      "version": "4.3.6",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.6.tgz",
-      "integrity": "sha512-O/09Bd4Z1fBrU4VzkhFqVgpPzaGbw6Sm9FEkBT1A/YBXQFGuuSxa1dN2nxgxS34JmKXqYx8CZAwEVoJFImUXIg==",
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
       "license": "MIT",
       "dependencies": {
-        "ms": "2.1.2"
+        "ms": "^2.1.3"
       },
       "engines": {
         "node": ">=6.0"
@@ -235,16 +281,6 @@
         "node": ">= 0.8"
       }
     },
-    "node_modules/destroy": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.2.0.tgz",
-      "integrity": "sha512-2sJGJTaXIIaR1w4iJSNoN0hnMY7Gpc/n8D4qSCJw8QqFWXf7cuAgnEHxBpweaVcPevC2l3KpjYCx3NypQQgaJg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.8",
-        "npm": "1.2.8000 || >= 1.4.16"
-      }
-    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
@@ -341,54 +377,57 @@
       }
     },
     "node_modules/express": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/express/-/express-5.0.1.tgz",
-      "integrity": "sha512-ORF7g6qGnD+YtUG9yx4DFoqCShNMmUKiXuT5oWMHiOvt/4WFbHC6yCwQMTSBMno7AqntNCAzzcnnjowRkTL9eQ==",
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-5.2.1.tgz",
+      "integrity": "sha512-hIS4idWWai69NezIdRt2xFVofaF4j+6INOpJlVOLDO8zXGpUVEVzIYk12UUi2JzjEzWL3IOAxcTubgz9Po0yXw==",
       "license": "MIT",
       "peer": true,
       "dependencies": {
         "accepts": "^2.0.0",
-        "body-parser": "^2.0.1",
+        "body-parser": "^2.2.1",
         "content-disposition": "^1.0.0",
-        "content-type": "~1.0.4",
-        "cookie": "0.7.1",
+        "content-type": "^1.0.5",
+        "cookie": "^0.7.1",
         "cookie-signature": "^1.2.1",
-        "debug": "4.3.6",
-        "depd": "2.0.0",
-        "encodeurl": "~2.0.0",
-        "escape-html": "~1.0.3",
-        "etag": "~1.8.1",
-        "finalhandler": "^2.0.0",
-        "fresh": "2.0.0",
-        "http-errors": "2.0.0",
+        "debug": "^4.4.0",
+        "depd": "^2.0.0",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "etag": "^1.8.1",
+        "finalhandler": "^2.1.0",
+        "fresh": "^2.0.0",
+        "http-errors": "^2.0.0",
         "merge-descriptors": "^2.0.0",
-        "methods": "~1.1.2",
         "mime-types": "^3.0.0",
-        "on-finished": "2.4.1",
-        "once": "1.4.0",
-        "parseurl": "~1.3.3",
-        "proxy-addr": "~2.0.7",
-        "qs": "6.13.0",
-        "range-parser": "~1.2.1",
-        "router": "^2.0.0",
-        "safe-buffer": "5.2.1",
+        "on-finished": "^2.4.1",
+        "once": "^1.4.0",
+        "parseurl": "^1.3.3",
+        "proxy-addr": "^2.0.7",
+        "qs": "^6.14.0",
+        "range-parser": "^1.2.1",
+        "router": "^2.2.0",
         "send": "^1.1.0",
-        "serve-static": "^2.1.0",
-        "setprototypeof": "1.2.0",
-        "statuses": "2.0.1",
-        "type-is": "^2.0.0",
-        "utils-merge": "1.0.1",
-        "vary": "~1.1.2"
+        "serve-static": "^2.2.0",
+        "statuses": "^2.0.1",
+        "type-is": "^2.0.1",
+        "vary": "^1.1.2"
       },
       "engines": {
         "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
     "node_modules/express-rate-limit": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-7.5.0.tgz",
-      "integrity": "sha512-eB5zbQh5h+VenMPM3fh+nw1YExi5nMr6HUCR62ELSP11huvxm/Uir1H1QEyTkk5QX6A58pX6NmaTMceKZ0Eodg==",
+      "version": "8.2.1",
+      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-8.2.1.tgz",
+      "integrity": "sha512-PCZEIEIxqwhzw4KF0n7QF4QqruVTcF73O5kFKUnGOyjbCCgizBBiFaYpd/fnBLUMPw/BWw9OsiN7GgrNYr7j6g==",
       "license": "MIT",
+      "dependencies": {
+        "ip-address": "10.0.1"
+      },
       "engines": {
         "node": ">= 16"
       },
@@ -396,13 +435,35 @@
         "url": "https://github.com/sponsors/express-rate-limit"
       },
       "peerDependencies": {
-        "express": "^4.11 || 5 || ^5.0.0-beta.1"
+        "express": ">= 4.11"
       }
     },
+    "node_modules/fast-deep-equal": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
+      "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
+      "license": "MIT"
+    },
+    "node_modules/fast-uri": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.1.0.tgz",
+      "integrity": "sha512-iPeeDKJSWf4IEOasVVrknXpaBV0IApz/gp7S2bb7Z4Lljbl2MGJRqInZiUrQwV16cpzw/D3S5j5Julj/gT52AA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "BSD-3-Clause"
+    },
     "node_modules/finalhandler": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-2.1.0.tgz",
-      "integrity": "sha512-/t88Ty3d5JWQbWYgaOGCCYfXRwV1+be02WqYYlL6h0lEiUAMPM8o8qKGO01YIkOHzka2up08wvgYD0mDiI+q3Q==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-2.1.1.tgz",
+      "integrity": "sha512-S8KoZgRZN+a5rNwqTxlZZePjT/4cnm0ROV70LedRHZ0p8u9fRID0hJUZQpkKLzro8LfmC8sx23bY6tVNxv8pQA==",
       "license": "MIT",
       "dependencies": {
         "debug": "^4.4.0",
@@ -413,32 +474,13 @@
         "statuses": "^2.0.1"
       },
       "engines": {
-        "node": ">= 0.8"
-      }
-    },
-    "node_modules/finalhandler/node_modules/debug": {
-      "version": "4.4.0",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.0.tgz",
-      "integrity": "sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==",
-      "license": "MIT",
-      "dependencies": {
-        "ms": "^2.1.3"
+        "node": ">= 18.0.0"
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       "license": "MIT",
       "dependencies": {
         "encodeurl": "^2.0.0",
         "escape-html": "^1.0.3",
         "parseurl": "^1.3.3",
-        "send": "^1.0.0"
+        "send": "^1.2.0"
       },
       "engines": {
         "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
     "node_modules/setimmediate": {
@@ -1013,6 +1064,27 @@
       "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
       "license": "ISC"
     },
+    "node_modules/shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+      "license": "MIT",
+      "dependencies": {
+        "shebang-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/side-channel": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
@@ -1086,9 +1158,9 @@
       }
     },
     "node_modules/statuses": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
-      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
       "license": "MIT",
       "engines": {
         "node": ">= 0.8"
@@ -1128,9 +1200,9 @@
       }
     },
     "node_modules/type-is": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.0.tgz",
-      "integrity": "sha512-gd0sGezQYCbWSbkZr75mln4YBidWUN60+devscpLF5mtRDUpiaTvKpBNrdaCvel1NdR2k6vclXybU5fBd2i+nw==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
+      "integrity": "sha512-OZs6gsjF4vMp32qrCbiVSkrFmXtG/AZhY3t0iAMrMBiAZyV9oALtXO8hsrHbMXF9x6L3grlFuwW2oAz7cav+Gw==",
       "license": "MIT",
       "dependencies": {
         "content-type": "^1.0.5",
@@ -1156,15 +1228,6 @@
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
       "license": "MIT"
     },
-    "node_modules/utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.4.0"
-      }
-    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -1174,6 +1237,21 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -1202,9 +1280,9 @@
       }
     },
     "node_modules/zod": {
-      "version": "3.24.2",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-3.24.2.tgz",
-      "integrity": "sha512-lY7CDW43ECgW9u1TcT3IoXHflywfVqDYze4waEz812jR/bZ8FHDsl7pFQoSZTz5N+2NqRXs8GBwnAwo3ZNxqhQ==",
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
+      "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
       "license": "MIT",
       "peer": true,
       "funding": {
@@ -1212,12 +1290,12 @@
       }
     },
     "node_modules/zod-to-json-schema": {
-      "version": "3.24.5",
-      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.24.5.tgz",
-      "integrity": "sha512-/AuWwMP+YqiPbsJx5D6TfgRTc4kTLjsh5SOcd4bLsfUg2RcEXrFMJl1DGgdHy2aCfsIA/cr/1JM0xcB2GZji8g==",
+      "version": "3.25.1",
+      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.1.tgz",
+      "integrity": "sha512-pM/SU9d3YAggzi6MtR4h7ruuQlqKtad8e9S0fmxcMi+ueAK5Korys/aWcV9LIIHTVbj01NdzxcnXSN+O74ZIVA==",
       "license": "ISC",
       "peerDependencies": {
-        "zod": "^3.24.1"
+        "zod": "^3.25 || ^4"
       }
     }
   }
diff --git a/package.json b/package.json
index 19d5365..2ac81a1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@angiejones/mcp-selenium",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Selenium WebDriver MCP Server",
   "type": "module",
   "main": "src/lib/server.js",
@@ -14,7 +14,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@modelcontextprotocol/sdk": "^1.7.0",
+    "@modelcontextprotocol/sdk": "^1.26.0",
     "selenium-webdriver": "^4.18.1"
   }
 }
diff --git a/src/lib/accessibility-snapshot.js b/src/lib/accessibility-snapshot.js
new file mode 100644
index 0000000..e4c1316
--- /dev/null
+++ b/src/lib/accessibility-snapshot.js
@@ -0,0 +1,69 @@
+// Browser-side script — walks DOM to build accessibility tree.
+// Uses `var` intentionally: this is executed via WebDriver's executeScript in arbitrary
+// browser contexts, so we avoid `const`/`let` for maximum compatibility.
+var ROLE_MAP = {
+    A: 'link', BUTTON: 'button', INPUT: 'textbox', SELECT: 'combobox',
+    OPTION: 'option', TEXTAREA: 'textbox', IMG: 'img', TABLE: 'table',
+    THEAD: 'rowgroup', TBODY: 'rowgroup', TR: 'row', TH: 'columnheader',
+    TD: 'cell', UL: 'list', OL: 'list', LI: 'listitem', NAV: 'navigation',
+    MAIN: 'main', HEADER: 'banner', FOOTER: 'contentinfo', ASIDE: 'complementary',
+    FORM: 'form', SECTION: 'region', H1: 'heading', H2: 'heading',
+    H3: 'heading', H4: 'heading', H5: 'heading', H6: 'heading',
+    DIALOG: 'dialog', DETAILS: 'group', SUMMARY: 'button',
+    FIELDSET: 'group', LEGEND: 'legend', LABEL: 'label',
+    PROGRESS: 'progressbar', METER: 'meter'
+};
+var INPUT_ROLES = {
+    checkbox: 'checkbox', radio: 'radio', button: 'button',
+    submit: 'button', reset: 'button', range: 'slider',
+    search: 'searchbox', email: 'textbox', url: 'textbox',
+    tel: 'textbox', number: 'spinbutton'
+};
+var SKIP = { SCRIPT:1, STYLE:1, NOSCRIPT:1, TEMPLATE:1, SVG:1 };
+
+function walk(el) {
+    if (!el) return null;
+    if (el.nodeType === 3) {
+        var t = el.textContent.trim();
+        return t ? { role: 'text', name: t.substring(0, 200) } : null;
+    }
+    if (el.nodeType !== 1 || SKIP[el.tagName]) return null;
+    // Note: we check the HTML hidden attribute and aria-hidden, but intentionally
+    // skip getComputedStyle checks for display:none / visibility:hidden — calling
+    // getComputedStyle on every node forces style recalculation and is too expensive
+    // for large DOMs. If you need CSS-hidden filtering, add it here at the cost of
+    // performance: var cs = window.getComputedStyle(el); if (cs.display === 'none' || cs.visibility === 'hidden') return null;
+    if (el.hidden || el.getAttribute('aria-hidden') === 'true') return null;
+
+    var tag = el.tagName;
+    var role = el.getAttribute('role') || (tag === 'INPUT' ? INPUT_ROLES[el.type] : null) || ROLE_MAP[tag] || null;
+    var name = el.getAttribute('aria-label') || el.getAttribute('alt') || el.getAttribute('title')
+        || el.getAttribute('placeholder') || el.getAttribute('name') || null;
+    var node = {};
+    if (role) node.role = role;
+    if (name) node.name = name;
+    if (el.id) node.id = el.id;
+    if (/^H[1-6]$/.test(tag)) node.level = parseInt(tag[1], 10);
+    if (el.href) node.href = el.href;
+    if (el.disabled) node.disabled = true;
+    if (el.checked) node.checked = true;
+    if (el.required) node.required = true;
+    if (el.value && (tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT')) node.value = el.value.substring(0, 200);
+
+    var kids = [];
+    for (var i = 0; i < el.childNodes.length; i++) {
+        var c = walk(el.childNodes[i]);
+        if (c) kids.push(c);
+    }
+
+    // Collapse: text-only node with no role gets merged up
+    if (!role && !name && !el.id && kids.length === 1 && kids[0].role === 'text') return kids[0];
+    // Skip empty containers with no semantic meaning
+    if (!role && !name && !el.id && kids.length === 0) return null;
+
+    if (kids.length > 0) node.children = kids;
+    // If the node has nothing useful, skip it
+    if (!node.role && !node.name && !node.id && !node.children) return null;
+    return node;
+}
+return walk(document.body);
diff --git a/src/lib/server.js b/src/lib/server.js
index 8ff5b11..b3cdb36 100755
--- a/src/lib/server.js
+++ b/src/lib/server.js
@@ -1,7 +1,9 @@
 #!/usr/bin/env node
 
+import { readFileSync } from 'fs';
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { McpError, ErrorCode } from "@modelcontextprotocol/sdk/types.js";
 import { z } from "zod";
 import pkg from 'selenium-webdriver';
 const { Builder, By, Key, until, Actions, error } = pkg;
@@ -111,6 +113,11 @@ async function setupBidi(driver, sessionId) {
     state.bidi.set(sessionId, bidi);
 }
 
+// Browser-side script loaded from file and executed via WebDriver's executeScript.
+const accessibilitySnapshotScript = readFileSync(
+    new URL('./accessibility-snapshot.js', import.meta.url), 'utf-8'
+);
+
 // Common schemas
 const browserOptionsSchema = z.object({
     headless: z.boolean().optional().describe("Run browser in headless mode"),
@@ -124,12 +131,14 @@ const locatorSchema = {
 };
 
 // Browser Management Tools
-server.tool(
+server.registerTool(
     "start_browser",
-    "launches browser",
     {
-        browser: z.enum(["chrome", "firefox", "edge", "safari"]).describe("Browser to launch (chrome, firefox, edge, or safari)"),
-        options: browserOptionsSchema
+        description: "launches browser",
+        inputSchema: {
+            browser: z.enum(["chrome", "firefox", "edge", "safari"]).describe("Browser to launch (chrome, firefox, edge, or safari)"),
+            options: browserOptionsSchema
+        }
     },
     async ({ browser, options = {} }) => {
         try {
@@ -238,11 +247,13 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "navigate",
-    "navigates to a URL",
     {
+        description: "navigates to a URL",
+        inputSchema: {
         url: z.string().describe("URL to navigate to")
+    }
     },
     async ({ url }) => {
         try {
@@ -261,12 +272,14 @@ server.tool(
 );
 
 // Element Interaction Tools
-server.tool(
+server.registerTool(
     "interact",
-    "performs a mouse action on an element",
     {
+        description: "performs a mouse action on an element",
+        inputSchema: {
         action: z.enum(["click", "doubleclick", "rightclick", "hover"]).describe("Mouse action to perform"),
         ...locatorSchema
+    }
     },
     async ({ action, by, value, timeout = 10000 }) => {
         try {
@@ -305,12 +318,14 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "send_keys",
-    "sends keys to an element, aka typing. Clears the field first.",
     {
+        description: "sends keys to an element, aka typing. Clears the field first.",
+        inputSchema: {
         ...locatorSchema,
         text: z.string().describe("Text to enter into the element")
+    }
     },
     async ({ by, value, text, timeout = 10000 }) => {
         try {
@@ -331,11 +346,13 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "get_element_text",
-    "gets the text content of an element",
     {
+        description: "gets the text content of an element",
+        inputSchema: {
         ...locatorSchema
+    }
     },
     async ({ by, value, timeout = 10000 }) => {
         try {
@@ -355,11 +372,13 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "press_key",
-    "simulates pressing a keyboard key",
     {
+        description: "simulates pressing a keyboard key",
+        inputSchema: {
         key: z.string().describe("Key to press (e.g., 'Enter', 'Tab', 'a', etc.)")
+    }
     },
     async ({ key }) => {
         try {
@@ -387,12 +406,14 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "upload_file",
-    "uploads a file using a file input element",
     {
+        description: "uploads a file using a file input element",
+        inputSchema: {
         ...locatorSchema,
         filePath: z.string().describe("Absolute path to the file to upload")
+    }
     },
     async ({ by, value, filePath, timeout = 10000 }) => {
         try {
@@ -412,11 +433,13 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "take_screenshot",
-    "captures a screenshot of the current page",
     {
+        description: "captures a screenshot of the current page",
+        inputSchema: {
         outputPath: z.string().optional().describe("Optional path where to save the screenshot. If not provided, returns an image/png content block.")
+    }
     },
     async ({ outputPath }) => {
         try {
@@ -444,10 +467,12 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "close_session",
-    "closes the current browser session",
-    {},
+    {
+        description: "closes the current browser session",
+        inputSchema: {}
+    },
     async () => {
         try {
             const driver = getDriver();
@@ -472,12 +497,14 @@ server.tool(
 );
 
 // Element Utility Tools
-server.tool(
+server.registerTool(
     "get_element_attribute",
-    "gets the value of an attribute on an element",
     {
+        description: "gets the value of an attribute on an element",
+        inputSchema: {
         ...locatorSchema,
         attribute: z.string().describe("Name of the attribute to get (e.g., 'href', 'value', 'class')")
+    }
     },
     async ({ by, value, attribute, timeout = 10000 }) => {
         try {
@@ -497,12 +524,14 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "execute_script",
-    "executes JavaScript in the browser and returns the result. Use for advanced interactions not covered by other tools (e.g., drag and drop, scrolling, reading computed styles, manipulating the DOM directly).",
     {
+        description: "executes JavaScript in the browser and returns the result. Use for advanced interactions not covered by other tools (e.g., drag and drop, scrolling, reading computed styles, manipulating the DOM directly).",
+        inputSchema: {
         script: z.string().describe("JavaScript code to execute in the browser"),
         args: z.array(z.any()).optional().describe("Optional arguments to pass to the script (accessible via arguments[0], arguments[1], etc.)")
+    }
     },
     async ({ script, args = [] }) => {
         try {
@@ -524,12 +553,14 @@ server.tool(
 );
 
 // Window/Tab Management
-server.tool(
+server.registerTool(
     "window",
-    "manages browser windows and tabs",
     {
+        description: "manages browser windows and tabs",
+        inputSchema: {
         action: z.enum(["list", "switch", "switch_latest", "close"]).describe("Window action to perform"),
         handle: z.string().optional().describe("Window handle (required for switch)")
+    }
     },
     async ({ action, handle }) => {
         try {
@@ -580,15 +611,17 @@ server.tool(
 );
 
 // Frame Management
-server.tool(
+server.registerTool(
     "frame",
-    "switches focus to a frame or back to the main page",
     {
+        description: "switches focus to a frame or back to the main page",
+        inputSchema: {
         action: z.enum(["switch", "default"]).describe("Frame action to perform"),
         by: z.enum(["id", "css", "xpath", "name", "tag", "class"]).optional().describe("Locator strategy for frame element"),
         value: z.string().optional().describe("Value for the locator strategy"),
         index: z.number().optional().describe("Frame index (0-based)"),
         timeout: z.number().optional().describe("Max wait in ms")
+    }
     },
     async ({ action, by, value, index, timeout = 10000 }) => {
         try {
@@ -618,13 +651,15 @@ server.tool(
 );
 
 // Alert/Dialog Handling
-server.tool(
+server.registerTool(
     "alert",
-    "handles a browser alert, confirm, or prompt dialog",
     {
+        description: "handles a browser alert, confirm, or prompt dialog",
+        inputSchema: {
         action: z.enum(["accept", "dismiss", "get_text", "send_text"]).describe("Action to perform on the alert"),
         text: z.string().optional().describe("Text to send (required for send_text)"),
         timeout: z.number().optional().describe("Max wait in ms")
+    }
     },
     async ({ action, text, timeout = 5000 }) => {
         try {
@@ -662,10 +697,11 @@ server.tool(
 
 
 // Cookie Management Tools
-server.tool(
+server.registerTool(
     "add_cookie",
-    "adds a cookie to the current browser session. The browser must be on a page from the cookie's domain before setting it.",
     {
+        description: "adds a cookie to the current browser session. The browser must be on a page from the cookie's domain before setting it.",
+        inputSchema: {
         name: z.string().describe("Name of the cookie"),
         value: z.string().describe("Value of the cookie"),
         domain: z.string().optional().describe("Domain the cookie is visible to"),
@@ -673,6 +709,7 @@ server.tool(
         secure: z.boolean().optional().describe("Whether the cookie is a secure cookie"),
         httpOnly: z.boolean().optional().describe("Whether the cookie is HTTP only"),
         expiry: z.number().optional().describe("Expiry date of the cookie as a Unix timestamp (seconds since epoch)")
+    }
     },
     async ({ name, value, domain, path, secure, httpOnly, expiry }) => {
         try {
@@ -696,11 +733,13 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "get_cookies",
-    "retrieves cookies from the current browser session. Returns all cookies or a specific cookie by name.",
     {
+        description: "retrieves cookies from the current browser session. Returns all cookies or a specific cookie by name.",
+        inputSchema: {
         name: z.string().optional().describe("Name of a specific cookie to retrieve. If omitted, all cookies are returned.")
+    }
     },
     async ({ name }) => {
         try {
@@ -741,11 +780,13 @@ server.tool(
     }
 );
 
-server.tool(
+server.registerTool(
     "delete_cookie",
-    "deletes cookies from the current browser session. Can delete a specific cookie by name or all cookies.",
     {
+        description: "deletes cookies from the current browser session. Can delete a specific cookie by name or all cookies.",
+        inputSchema: {
         name: z.string().optional().describe("Name of the cookie to delete. If omitted, all cookies are deleted.")
+    }
     },
     async ({ name }) => {
         try {
@@ -777,12 +818,14 @@ const diagnosticTypes = {
     network:  { logKey: 'networkLogs', emptyMessage: 'No network activity captured' }
 };
 
-server.tool(
+server.registerTool(
     "diagnostics",
-    "retrieves browser diagnostics (console logs, JS errors, or network activity) captured via WebDriver BiDi",
     {
+        description: "retrieves browser diagnostics (console logs, JS errors, or network activity) captured via WebDriver BiDi",
+        inputSchema: {
         type: z.enum(["console", "errors", "network"]).describe("Type of diagnostic data to retrieve"),
         clear: z.boolean().optional().describe("Clear after returning (default: false)")
+    }
     },
     async ({ type, clear = false }) => {
         try {
@@ -806,7 +849,7 @@ server.tool(
 );
 
 // Resources
-server.resource(
+server.registerResource(
     "browser-status",
     "browser-status://current",
     {
@@ -824,6 +867,28 @@ server.resource(
     })
 );
 
+server.registerResource(
+    "accessibility-snapshot",
+    "accessibility://current",
+    {
+        description: "Accessibility tree snapshot of the current page. A compact, structured representation of interactive elements and text content, much smaller than full HTML. Useful for understanding page layout and finding elements to interact with.",
+        mimeType: "application/json"
+    },
+    async (uri) => {
+        try {
+            const driver = state.drivers.get(state.currentSession);
+            //-32002 is not in the SDK but is noted in the MCP specification: 
+            // https://modelcontextprotocol.io/specification/2025-11-25/server/resources#error-handling
+            if (!driver) throw new McpError(-32002, "No active browser session. Start a browser first.");
+            const tree = await driver.executeScript(accessibilitySnapshotScript) || {};
+            return { contents: [{ uri: uri.href, mimeType: "application/json", text: JSON.stringify(tree, null, 2) }] };
+        } catch (e) {
+            if (e instanceof McpError) throw e;
+            throw new McpError(ErrorCode.InternalError, `Failed to capture accessibility snapshot: ${e.message}`);
+        }
+    }
+);
+
 // Cleanup handler
 async function cleanup() {
     for (const [sessionId, driver] of state.drivers) {
diff --git a/test/mcp-client.mjs b/test/mcp-client.mjs
index f838e34..24a2be0 100644
--- a/test/mcp-client.mjs
+++ b/test/mcp-client.mjs
@@ -103,6 +103,28 @@ export class McpClient {
     return resp.result.tools;
   }
 
+  /**
+   * List all available resources.
+   */
+  async listResources() {
+    const resp = await this.#sendRequest('resources/list', {});
+    if (resp.error) {
+      throw new Error(`RPC error listing resources: ${JSON.stringify(resp.error)}`);
+    }
+    return resp.result.resources;
+  }
+
+  /**
+   * Read a resource by URI.
+   */
+  async readResource(uri) {
+    const resp = await this.#sendRequest('resources/read', { uri });
+    if (resp.error) {
+      throw new Error(`RPC error reading resource: ${JSON.stringify(resp.error)}`);
+    }
+    return resp.result;
+  }
+
   /**
    * Stop the server process and clean up.
    */
diff --git a/test/navigation.test.mjs b/test/navigation.test.mjs
index 3037918..6401a75 100644
--- a/test/navigation.test.mjs
+++ b/test/navigation.test.mjs
@@ -135,14 +135,11 @@ describe('Navigation & Element Locators', () => {
     });
 
     it('should reject unsupported locator strategy via schema validation', async () => {
-      await assert.rejects(
-        () => client.callTool('get_element_text', { by: 'invalid', value: 'test' }),
-        (err) => {
-          assert.ok(err.message.includes('invalid_enum_value') || err.message.includes('Invalid'),
-            `Expected validation error, got: ${err.message}`);
-          return true;
-        }
-      );
+      const result = await client.callTool('get_element_text', { by: 'invalid', value: 'test' });
+      assert.strictEqual(result.isError, true, 'Expected isError: true for invalid enum value');
+      const text = getResponseText(result);
+      assert.ok(text.includes('invalid') || text.includes('Invalid'),
+        `Expected validation error, got: ${text}`);
     });
 
     it('should error when element not found', async () => {
diff --git a/test/resources.test.mjs b/test/resources.test.mjs
new file mode 100644
index 0000000..a394fe6
--- /dev/null
+++ b/test/resources.test.mjs
@@ -0,0 +1,92 @@
+/**
+ * MCP Resources — accessibility-snapshot tests.
+ * Requires a browser session with a loaded page.
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import { McpClient, fixture } from './mcp-client.mjs';
+
+describe('Resources', () => {
+  let client;
+
+  before(async () => {
+    client = new McpClient();
+    await client.start();
+    await client.callTool('start_browser', {
+      browser: 'chrome',
+      options: { headless: true, arguments: ['--no-sandbox', '--disable-dev-shm-usage'] },
+    });
+    await client.callTool('navigate', { url: fixture('locators.html') });
+  });
+
+  after(async () => {
+    try { await client.callTool('close_session'); } catch { /* ignore */ }
+    await client.stop();
+  });
+
+  describe('accessibility://current', () => {
+    it('should include page elements with roles, levels, and IDs', async () => {
+      const result = await client.readResource('accessibility://current');
+      assert.equal(result.contents[0].mimeType, 'application/json');
+      const tree = JSON.parse(result.contents[0].text);
+
+      const headings = findNodes(tree, (n) => n.role === 'heading');
+      assert.ok(headings.length > 0, 'Should find at least one heading');
+      assert.equal(headings[0].level, 1, 'H1 should have level 1');
+
+      const buttons = findNodes(tree, (n) => n.role === 'button');
+      const links = findNodes(tree, (n) => n.role === 'link');
+      const textboxes = findNodes(tree, (n) => n.role === 'textbox');
+      assert.ok(buttons.length > 0, 'Should find at least one button');
+      assert.ok(links.length > 0, 'Should find at least one link');
+      assert.ok(textboxes.length > 0, 'Should find at least one textbox');
+
+      const ids = findNodes(tree, (n) => n.id).map((n) => n.id);
+      assert.ok(ids.includes('title'), 'Should include #title');
+      assert.ok(ids.includes('btn'), 'Should include #btn');
+      assert.ok(ids.includes('input'), 'Should include #input');
+    });
+
+    it('should not include script or style content', async () => {
+      await client.callTool('execute_script', {
+        script: `
+          var s = document.createElement('script'); s.textContent = 'var secret = 42;'; document.body.appendChild(s);
+          var c = document.createElement('style'); c.textContent = 'body { color: red; }'; document.body.appendChild(c);
+        `
+      });
+      const result = await client.readResource('accessibility://current');
+      const text = result.contents[0].text;
+      assert.ok(!text.includes('secret'), 'Tree should not contain script content');
+      assert.ok(!text.includes('color: red'), 'Tree should not contain style content');
+    });
+
+    // Separate client needed: the main client already has a browser session,
+    // and we need a clean session with no browser to test the no-session error path.
+    it('should return error code -32002 when reading with no session', async () => {
+      const freshClient = new McpClient();
+      await freshClient.start();
+      try {
+        await freshClient.readResource('accessibility://current');
+        assert.fail('Should have thrown');
+      } catch (e) {
+        assert.ok(e.message.includes('-32002') || e.message.includes('No active browser session'), `Expected -32002 error, got: ${e.message}`);
+      } finally {
+        await freshClient.stop();
+      }
+    });
+  });
+});
+
+/** Recursively find nodes matching a predicate. */
+function findNodes(node, predicate) {
+  if (!node) return [];
+  const results = [];
+  if (predicate(node)) results.push(node);
+  if (node.children) {
+    for (const child of node.children) {
+      results.push(...findNodes(child, predicate));
+    }
+  }
+  return results;
+}
diff --git a/test/server.test.mjs b/test/server.test.mjs
index b09f050..591a135 100644
--- a/test/server.test.mjs
+++ b/test/server.test.mjs
@@ -1,5 +1,5 @@
 /**
- * MCP Server — connection and tool registration tests.
+ * MCP Server — connection, tool registration, and resource registration tests.
  * No browser needed for these.
  */
 
@@ -74,4 +74,20 @@ describe('MCP Server', () => {
       assert.equal(tool.inputSchema.type, 'object', `Tool "${tool.name}" schema should be type object`);
     }
   });
+
+  it('should register all expected resources', async () => {
+    const resources = await client.listResources();
+    const uris = resources.map((r) => r.uri);
+
+    const expected = [
+      'browser-status://current',
+      'accessibility://current',
+    ];
+
+    for (const uri of expected) {
+      assert.ok(uris.includes(uri), `Missing resource: ${uri}`);
+    }
+
+    assert.equal(uris.length, expected.length, `Expected ${expected.length} resources, got ${uris.length}: ${uris.join(', ')}`);
+  });
 });