diff --git a/.gitignore b/.gitignore
index 4027b13..6bda689 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,7 @@
 .DS_Store
 .env
 *.swp
+
+# Optional Playwright helper
+tools/playwright/node_modules/
+tools/playwright/package-lock.json
diff --git a/README.md b/README.md
index b0d67d4..d085849 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # GrokBoy
 
-Minimal local **GrokBot-like** CLI agent. Phase **P2**: completion contract, loop guard, context truncation.
+Minimal local **GrokBot-like** CLI agent. Phase **P3**: optional Playwright DOM browser tools.
 
 ## Status
 
@@ -9,7 +9,7 @@ Minimal local **GrokBot-like** CLI agent. Phase **P2**: completion contract, loo
 | P0 streaming chat | done |
 | P1 shell / files + ReAct | done |
 | P2 completion / loop guard / truncation | done |
-| P3 browser (Playwright) | later |
+| P3 browser (Playwright DOM) | done (optional) |
 
 No Docker desktop, no Codex/LazyBoy fork.
 
@@ -26,36 +26,52 @@ cd ~/GrokBoy
 cargo run -p grokboy -- chat
 ```
 
+### Optional: Playwright browser tools
+
+Browser tools are always registered but **fail closed** until you install the helper:
+
+```bash
+cd ~/GrokBoy/tools/playwright
+npm install
+npx playwright install chromium
+```
+
+Then the agent can use `browser_navigate`, `browser_snapshot`, `browser_click`, `browser_type`, `browser_eval` (DOM/selector/role — not screenshot-first).
+
 ## Commands
 
 - `grokboy chat` — interactive streaming chat (no tools)
 - `grokboy run "<prompt>"` — one-shot agent with tools
 - `grokboy run --session <id> "<prompt>"` — continue a saved session
-- `grokboy smoke` — offline checks (no API key required)
+- `grokboy smoke` — offline checks (no API key / no Chromium required)
 - `grokboy help`
 
-Tools: `shell`, `list_dir`, `read_file`, `write_file`, `report_done`, `report_blocked`.
+Tools: `shell`, `list_dir`, `read_file`, `write_file`, `report_done`, `report_blocked`,
+`browser_navigate`, `browser_snapshot`, `browser_click`, `browser_type`, `browser_eval`.
 
-Sessions are stored under `~/.grokboy/sessions/<id>.json`.
+Sessions are stored under `~/.grokboy/sessions/<id>.json` (may include `last_browser_url`).
 
 The agent stops on `report_done` / `report_blocked`, blocks identical tool rounds (×3), and truncates old context when over budget.
 
 ## 繁體中文
 
-本機終端機 coding assistant。P2 已支援完成合約（`report_done` / `report_blocked`）、迴圈守衛與上下文截斷。
+本機終端機 coding assistant。P3 可選 Playwright DOM 瀏覽器工具（非截圖優先）。
 
 ```bash
 export GROKBOY_API_KEY=你的金鑰
 cd ~/GrokBoy
 cargo run -p grokboy -- smoke
-cargo run -p grokboy -- run "列出目前目錄並讀 README.md"
+# 可選瀏覽器：
+cd tools/playwright && npm install && npx playwright install chromium
+cargo run -p grokboy -- run "打開 example.com 並 snapshot"
 cargo run -p grokboy -- chat
 ```
 
 ## Layout
 
 ```
-crates/grokboy-core/   # config, model, tools, agent, session
-crates/grokboy/       # CLI binary
+crates/grokboy-core/   # config, model, tools, browser, agent, session
+crates/grokboy/        # CLI binary
+tools/playwright/      # optional Node Playwright helper (JSONL)
 docs/ACCEPTANCE.md
 ```
diff --git a/crates/grokboy-core/src/agent.rs b/crates/grokboy-core/src/agent.rs
index d8ad7e4..2b04f1e 100644
--- a/crates/grokboy-core/src/agent.rs
+++ b/crates/grokboy-core/src/agent.rs
@@ -15,7 +15,8 @@ pub const AGENT_SYSTEM: &str = "\
 You are GrokBoy, a concise local coding assistant with tools.
 Use tools when they help solve the task; otherwise answer directly.
 Prefer short, clear answers. Traditional Chinese is welcome when the user writes in Chinese.
-Available tools: shell, list_dir, read_file, write_file, report_done, report_blocked.
+Available tools: shell, list_dir, read_file, write_file, report_done, report_blocked, and optional browser_* (Playwright DOM: browser_navigate, browser_snapshot, browser_click, browser_type, browser_eval).
+For web pages prefer DOM snapshot + selector/role click/type — not screenshots or pixel XY clicks.
 When the task is finished, call report_done with a short summary.
 If you are stuck or cannot proceed, call report_blocked with the reason — do not invent results or loop.
 Do not invent tool results — call the tools.";
@@ -312,6 +313,7 @@ mod tests {
         assert!(AGENT_SYSTEM.contains("shell"));
         assert!(AGENT_SYSTEM.contains("report_done"));
         assert!(AGENT_SYSTEM.contains("report_blocked"));
+        assert!(AGENT_SYSTEM.contains("browser_navigate") || AGENT_SYSTEM.contains("browser_"));
         assert!(AGENT_SYSTEM.contains("Traditional Chinese") || AGENT_SYSTEM.contains("Chinese"));
     }
 
diff --git a/crates/grokboy-core/src/browser.rs b/crates/grokboy-core/src/browser.rs
new file mode 100644
index 0000000..77623da
--- /dev/null
+++ b/crates/grokboy-core/src/browser.rs
@@ -0,0 +1,553 @@
+//! Optional Playwright DOM browser tools (P3).
+//!
+//! Spawns `tools/playwright/browser_helper.mjs` (JSONL over stdin/stdout).
+//! Fail closed with an install hint when Node / Playwright / Chromium is missing.
+//! Prefer selectors / roles — not screenshot-first control.
+
+use anyhow::{Context, Result, anyhow};
+use serde_json::{Value, json};
+use std::io::{BufRead, BufReader, Write};
+use std::path::{Path, PathBuf};
+use std::process::{Child, ChildStdin, ChildStdout, Command, Stdio};
+use std::sync::{Arc, Mutex, OnceLock};
+use std::time::{Duration, Instant};
+
+pub const INSTALL_HINT: &str = "Playwright browser tools unavailable. Install with: \
+cd tools/playwright && npm install && npx playwright install chromium";
+
+const HELPER_REL: &str = "tools/playwright/browser_helper.mjs";
+const HELPER_TIMEOUT: Duration = Duration::from_secs(60);
+
+/// Shared last navigated URL for session metadata.
+pub type LastUrlSlot = Arc<Mutex<Option<String>>>;
+
+static HELPER: OnceLock<Mutex<HelperState>> = OnceLock::new();
+
+enum HelperState {
+    /// Not started yet.
+    Idle,
+    /// Running JSONL child.
+    Running {
+        #[allow(dead_code)]
+        child: Child,
+        stdin: ChildStdin,
+        stdout: BufReader<ChildStdout>,
+        next_id: u64,
+    },
+    /// Permanently unavailable this process (missing node/helper).
+    Unavailable(String),
+}
+
+fn helper_lock() -> &'static Mutex<HelperState> {
+    HELPER.get_or_init(|| Mutex::new(HelperState::Idle))
+}
+
+/// Locate the helper script relative to cwd, then walk parents, then exe-relative.
+pub fn find_helper_script(cwd: &Path) -> Option<PathBuf> {
+    let mut dir = cwd.to_path_buf();
+    for _ in 0..8 {
+        let candidate = dir.join(HELPER_REL);
+        if candidate.is_file() {
+            return Some(candidate);
+        }
+        if !dir.pop() {
+            break;
+        }
+    }
+    // Also try next to the running binary's ancestors (dev: target/debug).
+    if let Ok(exe) = std::env::current_exe() {
+        let mut dir = exe.parent().map(|p| p.to_path_buf());
+        for _ in 0..6 {
+            let Some(d) = dir else { break };
+            let candidate = d.join(HELPER_REL);
+            if candidate.is_file() {
+                return Some(candidate);
+            }
+            // target/debug -> repo root
+            if let Some(parent) = d.parent() {
+                let up2 = parent.parent().map(|p| p.join(HELPER_REL));
+                if let Some(c) = up2 {
+                    if c.is_file() {
+                        return Some(c);
+                    }
+                }
+            }
+            dir = d.parent().map(|p| p.to_path_buf());
+        }
+    }
+    None
+}
+
+fn which_node() -> Option<PathBuf> {
+    // Prefer PATH lookup.
+    if let Ok(output) = Command::new("sh")
+        .arg("-c")
+        .arg("command -v node")
+        .output()
+    {
+        if output.status.success() {
+            let p = String::from_utf8_lossy(&output.stdout).trim().to_string();
+            if !p.is_empty() {
+                return Some(PathBuf::from(p));
+            }
+        }
+    }
+    None
+}
+
+fn spawn_helper(script: &Path) -> Result<(Child, ChildStdin, BufReader<ChildStdout>)> {
+    let node = which_node().ok_or_else(|| {
+        anyhow!("{INSTALL_HINT} (node not found on PATH)")
+    })?;
+
+    let mut child = Command::new(&node)
+        .arg(script)
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()
+        .with_context(|| format!("spawn node {}", script.display()))?;
+
+    let stdin = child
+        .stdin
+        .take()
+        .ok_or_else(|| anyhow!("helper stdin missing"))?;
+    let stdout = child
+        .stdout
+        .take()
+        .ok_or_else(|| anyhow!("helper stdout missing"))?;
+    Ok((child, stdin, BufReader::new(stdout)))
+}
+
+fn ensure_running<'a>(state: &'a mut HelperState, cwd: &Path) -> Result<(&'a mut ChildStdin, &'a mut BufReader<ChildStdout>, &'a mut u64)> {
+    match state {
+        HelperState::Unavailable(msg) => Err(anyhow!("{msg}")),
+        HelperState::Running { stdin, stdout, next_id, .. } => Ok((stdin, stdout, next_id)),
+        HelperState::Idle => {
+            let script = match find_helper_script(cwd) {
+                Some(p) => p,
+                None => {
+                    let msg = format!(
+                        "{INSTALL_HINT} (helper not found at {HELPER_REL} from {})",
+                        cwd.display()
+                    );
+                    *state = HelperState::Unavailable(msg.clone());
+                    return Err(anyhow!("{msg}"));
+                }
+            };
+            match spawn_helper(&script) {
+                Ok((child, stdin, stdout)) => {
+                    *state = HelperState::Running {
+                        child,
+                        stdin,
+                        stdout,
+                        next_id: 1,
+                    };
+                    match state {
+                        HelperState::Running {
+                            stdin,
+                            stdout,
+                            next_id,
+                            ..
+                        } => Ok((stdin, stdout, next_id)),
+                        _ => unreachable!(),
+                    }
+                }
+                Err(e) => {
+                    let msg = format!("{INSTALL_HINT} ({e:#})");
+                    *state = HelperState::Unavailable(msg.clone());
+                    Err(anyhow!("{msg}"))
+                }
+            }
+        }
+    }
+}
+
+fn read_json_line(stdout: &mut BufReader<ChildStdout>, deadline: Instant) -> Result<Value> {
+    let mut line = String::new();
+    loop {
+        if Instant::now() > deadline {
+            return Err(anyhow!("browser helper timed out waiting for response"));
+        }
+        // Blocking read — browser ops are infrequent; keep it simple.
+        line.clear();
+        let n = stdout
+            .read_line(&mut line)
+            .context("read helper stdout")?;
+        if n == 0 {
+            return Err(anyhow!("browser helper exited unexpectedly"));
+        }
+        let trimmed = line.trim();
+        if trimmed.is_empty() {
+            continue;
+        }
+        let v: Value = serde_json::from_str(trimmed)
+            .with_context(|| format!("helper returned non-JSON: {trimmed}"))?;
+        return Ok(v);
+    }
+}
+
+/// Send one JSON request to the helper; returns the parsed response object.
+pub fn browser_request(cwd: &Path, mut req: Value) -> Result<Value> {
+    let mut guard = helper_lock()
+        .lock()
+        .map_err(|_| anyhow!("browser helper lock poisoned"))?;
+
+    let (stdin, stdout, next_id) = ensure_running(&mut guard, cwd)?;
+    let id = *next_id;
+    *next_id += 1;
+    if req.get("id").is_none() {
+        req["id"] = json!(id.to_string());
+    }
+
+    let line = serde_json::to_string(&req)? + "\n";
+    stdin
+        .write_all(line.as_bytes())
+        .context("write to browser helper")?;
+    stdin.flush().context("flush browser helper")?;
+
+    let deadline = Instant::now() + HELPER_TIMEOUT;
+    let resp = read_json_line(stdout, deadline)?;
+
+    // If helper reported permanent missing playwright, mark unavailable for clearer retries.
+    if resp.get("ok") == Some(&json!(false)) {
+        if let Some(code) = resp.get("code").and_then(|c| c.as_str()) {
+            if code == "PLAYWRIGHT_MISSING" || code == "CHROMIUM_MISSING" {
+                // Keep process; user may install mid-session — don't mark Unavailable.
+            }
+        }
+    }
+
+    Ok(resp)
+}
+
+/// One-shot `--cmd` invocation (no daemon). Useful for offline protocol tests.
+pub fn browser_oneshot(cwd: &Path, req: &Value) -> Result<Value> {
+    let script = find_helper_script(cwd).ok_or_else(|| {
+        anyhow!("{INSTALL_HINT} (helper not found)")
+    })?;
+    let node = which_node().ok_or_else(|| anyhow!("{INSTALL_HINT} (node not found)"))?;
+    let cmd_json = serde_json::to_string(req)?;
+    let output = Command::new(node)
+        .arg(&script)
+        .arg("--cmd")
+        .arg(&cmd_json)
+        .current_dir(cwd)
+        .output()
+        .context("oneshot browser helper")?;
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    let line = stdout
+        .lines()
+        .rev()
+        .find(|l| !l.trim().is_empty())
+        .unwrap_or("");
+    if line.is_empty() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        return Err(anyhow!(
+            "browser helper produced no JSON (stderr: {})",
+            stderr.trim()
+        ));
+    }
+    let v: Value = serde_json::from_str(line)
+        .with_context(|| format!("oneshot non-JSON: {line}"))?;
+    Ok(v)
+}
+
+/// Run helper `--self-test` (no Chromium). Returns parsed summary JSON.
+pub fn browser_self_test(cwd: &Path) -> Result<Value> {
+    let script = find_helper_script(cwd).ok_or_else(|| {
+        anyhow!("{INSTALL_HINT} (helper not found)")
+    })?;
+    let node = which_node().ok_or_else(|| anyhow!("{INSTALL_HINT} (node not found)"))?;
+    let output = Command::new(node)
+        .arg(&script)
+        .arg("--self-test")
+        .current_dir(
+            script
+                .parent()
+                .unwrap_or(cwd),
+        )
+        .output()
+        .context("browser helper --self-test")?;
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    let line = stdout
+        .lines()
+        .rev()
+        .find(|l| !l.trim().is_empty())
+        .unwrap_or("");
+    if line.is_empty() {
+        return Err(anyhow!(
+            "self-test empty stdout; stderr={}",
+            String::from_utf8_lossy(&output.stderr)
+        ));
+    }
+    let v: Value = serde_json::from_str(line)?;
+    if !output.status.success() || v.get("ok") != Some(&json!(true)) {
+        return Err(anyhow!("self-test failed: {v}"));
+    }
+    Ok(v)
+}
+
+pub fn update_last_url(slot: &LastUrlSlot, resp: &Value) {
+    if let Some(url) = resp.get("url").and_then(|u| u.as_str()) {
+        if let Ok(mut g) = slot.lock() {
+            *g = Some(url.to_string());
+        }
+    }
+}
+
+pub fn response_to_tool_json(resp: Value) -> Value {
+    if resp.get("ok") == Some(&json!(true)) {
+        let mut out = resp;
+        if let Some(obj) = out.as_object_mut() {
+            obj.remove("ok");
+            obj.remove("id");
+        }
+        out
+    } else {
+        let err = resp
+            .get("error")
+            .and_then(|e| e.as_str())
+            .unwrap_or("browser tool failed");
+        json!({
+            "error": err,
+            "blocked": true,
+            "install_hint": INSTALL_HINT,
+            "detail": resp,
+        })
+    }
+}
+
+/// OpenAI tool definitions for browser ops (always registered; fail closed if missing).
+pub fn browser_tool_definitions() -> Vec<Value> {
+    vec![
+        json!({
+            "type": "function",
+            "function": {
+                "name": "browser_navigate",
+                "description": "Navigate the optional Playwright browser to a URL (DOM path). Fails closed with install hint if Playwright is missing.",
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "url": { "type": "string", "description": "URL to open" }
+                    },
+                    "required": ["url"]
+                }
+            }
+        }),
+        json!({
+            "type": "function",
+            "function": {
+                "name": "browser_snapshot",
+                "description": "Structured text snapshot of the page (roles/names/CSS selectors). Prefer this over screenshots for control.",
+                "parameters": {
+                    "type": "object",
+                    "properties": {},
+                    "additionalProperties": false
+                }
+            }
+        }),
+        json!({
+            "type": "function",
+            "function": {
+                "name": "browser_click",
+                "description": "Click an element by CSS selector or role/name (Playwright DOM). Not pixel/XY click.",
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "selector": { "type": "string", "description": "CSS selector" },
+                        "role": { "type": "string", "description": "ARIA role, e.g. button, link" },
+                        "name": { "type": "string", "description": "Accessible name when using role" },
+                        "text": { "type": "string", "description": "Visible text alternative" },
+                        "label": { "type": "string" },
+                        "placeholder": { "type": "string" }
+                    }
+                }
+            }
+        }),
+        json!({
+            "type": "function",
+            "function": {
+                "name": "browser_type",
+                "description": "Type/fill text into an element by CSS selector or role/name.",
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "text": { "type": "string", "description": "Text to type" },
+                        "selector": { "type": "string" },
+                        "role": { "type": "string" },
+                        "name": { "type": "string" },
+                        "label": { "type": "string" },
+                        "placeholder": { "type": "string" },
+                        "clear": { "type": "boolean", "description": "Fill (clear first) vs append; default true" }
+                    },
+                    "required": ["text"]
+                }
+            }
+        }),
+        json!({
+            "type": "function",
+            "function": {
+                "name": "browser_eval",
+                "description": "Evaluate a JavaScript expression in the page context (use sparingly; prefer snapshot/click/type).",
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "expression": { "type": "string", "description": "JS expression to eval in page" }
+                    },
+                    "required": ["expression"]
+                }
+            }
+        }),
+    ]
+}
+
+pub fn is_browser_tool(name: &str) -> bool {
+    matches!(
+        name,
+        "browser_navigate"
+            | "browser_snapshot"
+            | "browser_dom"
+            | "browser_click"
+            | "browser_type"
+            | "browser_eval"
+    )
+}
+
+pub async fn execute_browser_tool(
+    cwd: &Path,
+    last_url: &LastUrlSlot,
+    name: &str,
+    args: &Value,
+) -> Result<Value> {
+    // Run blocking helper I/O off the async runtime.
+    let cwd = cwd.to_path_buf();
+    let name = name.to_string();
+    let args = args.clone();
+    let last_url = last_url.clone();
+
+    tokio::task::spawn_blocking(move || {
+        let op = match name.as_str() {
+            "browser_navigate" => "navigate",
+            "browser_snapshot" | "browser_dom" => "snapshot",
+            "browser_click" => "click",
+            "browser_type" => "type",
+            "browser_eval" => "eval",
+            other => return Err(anyhow!("unknown browser tool: {other}")),
+        };
+
+        let mut req = args;
+        if let Some(obj) = req.as_object_mut() {
+            obj.insert("op".into(), json!(op));
+        } else {
+            req = json!({ "op": op });
+        }
+
+        // Normalize eval field
+        if op == "eval" {
+            if req.get("expression").is_none() {
+                if let Some(js) = req.get("js").cloned() {
+                    req["expression"] = js;
+                }
+            }
+        }
+
+        let resp = browser_request(&cwd, req)?;
+        update_last_url(&last_url, &resp);
+        Ok(response_to_tool_json(resp))
+    })
+    .await
+    .map_err(|e| anyhow!("browser task join: {e}"))?
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::time::{SystemTime, UNIX_EPOCH};
+
+    fn repo_cwd() -> PathBuf {
+        // Crate manifest dir is crates/grokboy-core → repo root is ../..
+        PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("../..")
+            .canonicalize()
+            .unwrap_or_else(|_| PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../.."))
+    }
+
+    #[test]
+    fn finds_helper_from_repo_root() {
+        let root = repo_cwd();
+        let helper = find_helper_script(&root);
+        assert!(
+            helper.is_some(),
+            "expected helper under {}/{HELPER_REL}",
+            root.display()
+        );
+    }
+
+    #[test]
+    fn helper_self_test_protocol() {
+        let root = repo_cwd();
+        // Skip soft if node missing (should still usually be present on Mac).
+        if which_node().is_none() {
+            eprintln!("skip: node not on PATH");
+            return;
+        }
+        let summary = browser_self_test(&root).expect("self-test");
+        assert_eq!(summary["ok"], true);
+    }
+
+    #[test]
+    fn oneshot_ping_json_protocol() {
+        let root = repo_cwd();
+        if which_node().is_none() {
+            eprintln!("skip: node not on PATH");
+            return;
+        }
+        let resp = browser_oneshot(&root, &json!({"op": "ping", "id": "u1"})).unwrap();
+        assert_eq!(resp["ok"], true);
+        assert_eq!(resp["pong"], true);
+        assert_eq!(resp["protocol"], 1);
+    }
+
+    #[test]
+    fn response_maps_errors_to_blocked() {
+        let v = response_to_tool_json(json!({
+            "ok": false,
+            "blocked": true,
+            "error": "nope",
+            "id": "1"
+        }));
+        assert!(v.get("error").is_some());
+        assert_eq!(v["blocked"], true);
+        assert!(v["install_hint"].as_str().unwrap().contains("npm install"));
+    }
+
+    #[test]
+    fn browser_defs_count() {
+        assert_eq!(browser_tool_definitions().len(), 5);
+        assert!(is_browser_tool("browser_navigate"));
+        assert!(is_browser_tool("browser_snapshot"));
+        assert!(!is_browser_tool("shell"));
+    }
+
+    #[test]
+    fn install_hint_constant() {
+        assert!(INSTALL_HINT.contains("npx playwright install chromium"));
+    }
+
+    #[tokio::test]
+    async fn execute_ping_via_navigate_missing_url_style() {
+        // Exercise execute path with type missing text → blocked JSON, no chromium needed
+        // if helper starts. Use browser_type without text through execute_browser_tool args check.
+        let root = repo_cwd();
+        if which_node().is_none() || find_helper_script(&root).is_none() {
+            return;
+        }
+        let slot: LastUrlSlot = Arc::new(Mutex::new(None));
+        // Direct request ping through oneshot already covered; here ensure spawn works with status via request.
+        let resp = browser_oneshot(&root, &json!({"op":"status"})).unwrap();
+        assert_eq!(resp["ok"], true);
+        let _ = slot;
+        let _ = SystemTime::now().duration_since(UNIX_EPOCH);
+    }
+}
diff --git a/crates/grokboy-core/src/lib.rs b/crates/grokboy-core/src/lib.rs
index 5d15197..bbbf59a 100644
--- a/crates/grokboy-core/src/lib.rs
+++ b/crates/grokboy-core/src/lib.rs
@@ -1,6 +1,7 @@
 //! GrokBoy core: config, streaming chat, tools, ReAct agent, sessions.
 
 mod agent;
+mod browser;
 mod config;
 mod model;
 mod session;
@@ -11,6 +12,7 @@ pub use agent::{
     context_char_budget, message_char_len, messages_char_len, round_signature, run_agent,
     run_agent_with, tool_call_signature, truncate_messages,
 };
+pub use browser::{INSTALL_HINT as BROWSER_INSTALL_HINT, browser_oneshot, browser_self_test, find_helper_script};
 pub use config::Config;
 pub use model::{ChatMessage, FunctionCall, Role, ToolCall, chat_completion, stream_chat};
 pub use session::{Session, load_or_create, load_session, save_session, sessions_dir};
diff --git a/crates/grokboy-core/src/session.rs b/crates/grokboy-core/src/session.rs
index f09e90f..b4e7b9d 100644
--- a/crates/grokboy-core/src/session.rs
+++ b/crates/grokboy-core/src/session.rs
@@ -15,6 +15,9 @@ pub struct Session {
     pub updated_at: DateTime<Utc>,
     pub cwd: PathBuf,
     pub messages: Vec<ChatMessage>,
+    /// Last page URL from optional Playwright browser tools (P3).
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub last_browser_url: Option<String>,
 }
 
 impl Session {
@@ -26,6 +29,7 @@ impl Session {
             updated_at: now,
             cwd: cwd.into(),
             messages: Vec::new(),
+            last_browser_url: None,
         }
     }
 
diff --git a/crates/grokboy-core/src/tools.rs b/crates/grokboy-core/src/tools.rs
index b271d48..713a49a 100644
--- a/crates/grokboy-core/src/tools.rs
+++ b/crates/grokboy-core/src/tools.rs
@@ -1,4 +1,4 @@
-//! Built-in tools: shell, list_dir, read_file, write_file, report_done, report_blocked.
+//! Built-in tools: shell, files, completion, and optional Playwright browser (P3).
 
 use anyhow::{Context, Result, anyhow};
 use serde_json::{Value, json};
@@ -7,6 +7,8 @@ use std::process::Stdio;
 use std::time::Duration;
 use tokio::process::Command;
 
+use crate::browser::{self, LastUrlSlot};
+
 pub const MAX_READ_BYTES: usize = 256 * 1024;
 pub const SHELL_TIMEOUT_SECS: u64 = 30;
 
@@ -17,6 +19,8 @@ pub struct ToolContext {
     pub cwd: PathBuf,
     /// Optional workspace root; paths outside it are rejected when set.
     pub workspace_root: Option<PathBuf>,
+    /// Last navigated browser URL (shared across clones).
+    pub last_browser_url: LastUrlSlot,
 }
 
 impl ToolContext {
@@ -25,6 +29,7 @@ impl ToolContext {
         Self {
             cwd: cwd.clone(),
             workspace_root: Some(cwd),
+            last_browser_url: std::sync::Arc::new(std::sync::Mutex::new(None)),
         }
     }
 
@@ -32,11 +37,15 @@ impl ToolContext {
         self.workspace_root = root;
         self
     }
+
+    pub fn last_browser_url_value(&self) -> Option<String> {
+        self.last_browser_url.lock().ok().and_then(|g| g.clone())
+    }
 }
 
 /// OpenAI-compatible tool definitions for chat completions.
 pub fn tool_definitions() -> Value {
-    json!([
+    let mut defs = json!([
         {
             "type": "function",
             "function": {
@@ -123,7 +132,12 @@ pub fn tool_definitions() -> Value {
                 }
             }
         }
-    ])
+    ]);
+    // Optional Playwright DOM tools (always registered; fail closed with install hint if missing).
+    if let Some(arr) = defs.as_array_mut() {
+        arr.extend(browser::browser_tool_definitions());
+    }
+    defs
 }
 
 /// True if the tool name ends the ReAct loop (completion contract).
@@ -191,6 +205,9 @@ async fn execute_tool_inner(ctx: &ToolContext, name: &str, arguments_json: &str)
         "write_file" => tool_write_file(ctx, &args).await,
         "report_done" => tool_report_done(&args),
         "report_blocked" => tool_report_blocked(&args),
+        name if browser::is_browser_tool(name) => {
+            browser::execute_browser_tool(&ctx.cwd, &ctx.last_browser_url, name, &args).await
+        }
         other => Err(anyhow!("unknown tool: {other}")),
     }
 }
@@ -476,10 +493,10 @@ mod tests {
     }
 
     #[test]
-    fn tool_defs_include_six() {
+    fn tool_defs_include_core_and_browser() {
         let defs = tool_definitions();
         let arr = defs.as_array().unwrap();
-        assert_eq!(arr.len(), 6);
+        assert_eq!(arr.len(), 11); // 6 core + 5 browser
         let names: Vec<&str> = arr
             .iter()
             .map(|t| t["function"]["name"].as_str().unwrap())
@@ -490,5 +507,33 @@ mod tests {
         assert!(names.contains(&"write_file"));
         assert!(names.contains(&"report_done"));
         assert!(names.contains(&"report_blocked"));
+        assert!(names.contains(&"browser_navigate"));
+        assert!(names.contains(&"browser_snapshot"));
+        assert!(names.contains(&"browser_click"));
+        assert!(names.contains(&"browser_type"));
+        assert!(names.contains(&"browser_eval"));
+    }
+
+    #[tokio::test]
+    async fn browser_tool_fails_closed_without_chromium_ok_with_helper() {
+        // Missing required args should fail closed via helper protocol (no Chromium needed).
+        let (ctx, dir) = temp_ctx();
+        // Point cwd at repo root so helper is found when running under cargo test.
+        let root = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../..");
+        let root = root.canonicalize().unwrap_or(root);
+        let ctx = ToolContext {
+            cwd: root.clone(),
+            workspace_root: ctx.workspace_root,
+            last_browser_url: ctx.last_browser_url,
+        };
+        let out = execute_tool(
+            &ctx,
+            "browser_type",
+            &json!({"selector": "#x"}).to_string(),
+        )
+        .await;
+        let v: Value = serde_json::from_str(&out).unwrap();
+        assert!(v.get("error").is_some(), "{v}");
+        let _ = std::fs::remove_dir_all(&dir);
     }
 }
diff --git a/crates/grokboy/src/main.rs b/crates/grokboy/src/main.rs
index 8b68408..aecca8f 100644
--- a/crates/grokboy/src/main.rs
+++ b/crates/grokboy/src/main.rs
@@ -6,6 +6,7 @@ use grokboy_core::{
 };
 use serde_json::json;
 use std::io::{self, Write};
+use std::path::PathBuf;
 use std::process::ExitCode;
 
 const CHAT_SYSTEM: &str = "You are GrokBoy, a concise local coding assistant. Prefer clear, short answers. Traditional Chinese is welcome when the user writes in Chinese.";
@@ -49,7 +50,7 @@ async fn run() -> Result<()> {
 fn print_help() {
     println!(
         "\
-GrokBoy — minimal local CLI agent (P2: completion + loop guard + truncation)
+GrokBoy — minimal local CLI agent (P3: optional Playwright DOM browser)
 
 USAGE:
   grokboy chat                      Interactive streaming chat (no tools)
@@ -65,8 +66,10 @@ ENV:
   GROKBOY_MODEL            default grok-4.6
   GROKBOY_CONTEXT_CHARS    context budget (default 100000)
 
-Tools: shell, list_dir, read_file, write_file, report_done, report_blocked
+Tools: shell, list_dir, read_file, write_file, report_done, report_blocked,
+       browser_navigate, browser_snapshot, browser_click, browser_type, browser_eval
 Sessions: ~/.grokboy/sessions/<id>.json
+Browser (optional): cd tools/playwright && npm i && npx playwright install chromium
 "
     );
 }
@@ -159,6 +162,9 @@ async fn cmd_run(args: &[String]) -> Result<()> {
     )
     .await?;
 
+    if let Some(url) = tool_ctx.last_browser_url_value() {
+        session.last_browser_url = Some(url);
+    }
     session.touch();
     let path = save_session(&session)?;
     println!("{}", verdict.message());
@@ -176,7 +182,7 @@ async fn cmd_run(args: &[String]) -> Result<()> {
 }
 
 async fn cmd_smoke() -> Result<()> {
-    println!("GrokBoy smoke (offline P2)…");
+    println!("GrokBoy smoke (offline P3)…");
     let stamp = uuid_like();
     let dir = std::env::temp_dir().join(format!("grokboy-smoke-{stamp}"));
     std::fs::create_dir_all(&dir).context("temp dir")?;
@@ -275,14 +281,39 @@ async fn cmd_smoke() -> Result<()> {
     }
     println!("  completion     ok");
 
-    // tool definitions present (6)
+    // tool definitions present (6 core + 5 browser)
     let defs = tool_definitions();
     let n_tools = defs.as_array().map(|a| a.len()).unwrap_or(0);
-    if n_tools != 6 {
-        return Err(anyhow!("expected 6 tool defs, got {n_tools}"));
+    if n_tools != 11 {
+        return Err(anyhow!("expected 11 tool defs, got {n_tools}"));
     }
     println!("  tool defs      ok");
 
+    // browser helper protocol (no Chromium required)
+    let repo = std::env::current_dir().unwrap_or_else(|_| PathBuf::from("."));
+    match grokboy_core::browser_self_test(&repo) {
+        Ok(_) => println!("  browser proto  ok"),
+        Err(e) => {
+            // Soft: smoke still passes if helper missing in weird cwd; warn.
+            println!("  browser proto  skip ({e:#})");
+        }
+    }
+    // Fail-closed install hint when navigating without ensuring chromium — oneshot missing url already covered in helper self-test.
+    let nav = execute_tool(
+        &ToolContext::new(repo.clone()),
+        "browser_navigate",
+        &json!({"url": ""}).to_string(),
+    )
+    .await;
+    let nav_v: serde_json::Value = serde_json::from_str(&nav)?;
+    // empty url should error from helper; if helper missing, also error with install hint
+    if nav_v.get("error").is_none() && nav_v.get("blocked").is_none() {
+        // empty string might still "succeed" oddly — accept either error or blocked
+        println!("  browser fail   note: {nav_v}");
+    } else {
+        println!("  browser fail   ok");
+    }
+
     // context truncation
     let mut msgs = vec![
         ChatMessage::system(AGENT_SYSTEM),
diff --git a/docs/ACCEPTANCE.md b/docs/ACCEPTANCE.md
index 12664c0..7718529 100644
--- a/docs/ACCEPTANCE.md
+++ b/docs/ACCEPTANCE.md
@@ -21,4 +21,8 @@
 - [x] Offline smoke/tests cover P2 without API key
 
 ## P3 — browser
-- [ ] Playwright DOM path (no screenshot-first)
+- [x] Playwright DOM path (no screenshot-first)
+- [x] Tools: `browser_navigate`, `browser_snapshot`, `browser_click`, `browser_type`, `browser_eval`
+- [x] Thin Node helper under `tools/playwright/` (JSONL / one-shot JSON)
+- [x] Fail closed with install hint when Node/Playwright/Chromium missing
+- [x] `cargo test` / `grokboy smoke` pass without Playwright browsers installed
diff --git a/tools/playwright/README.md b/tools/playwright/README.md
new file mode 100644
index 0000000..1214eb0
--- /dev/null
+++ b/tools/playwright/README.md
@@ -0,0 +1,21 @@
+# GrokBoy Playwright helper (optional)
+
+Thin Node script used by Rust `browser_*` tools.
+
+## Install
+
+```bash
+cd tools/playwright
+npm install
+npx playwright install chromium
+```
+
+## Protocol
+
+- **JSONL daemon** (default): one JSON request per stdin line → one JSON response on stdout.
+- **One-shot**: `node browser_helper.mjs --cmd '{"op":"ping"}'`
+- **Self-test** (no Chromium): `npm run self-test`
+
+Ops: `ping`, `navigate`, `snapshot`/`dom`, `click`, `type`, `eval`, `close`, `status`.
+
+Prefer CSS selector or `role`+`name` over screenshots.
diff --git a/tools/playwright/browser_helper.mjs b/tools/playwright/browser_helper.mjs
new file mode 100755
index 0000000..0e2a79c
--- /dev/null
+++ b/tools/playwright/browser_helper.mjs
@@ -0,0 +1,453 @@
+#!/usr/bin/env node
+/**
+ * GrokBoy Playwright DOM helper (optional).
+ *
+ * Modes:
+ *   JSONL daemon (default when no --cmd): read JSON lines from stdin, write JSON lines to stdout.
+ *   One-shot:  node browser_helper.mjs --cmd '<json>'
+ *   Self-test: node browser_helper.mjs --self-test   (no Chromium required)
+ *
+ * Ops: ping, navigate, snapshot, click, type, eval, close, status
+ * Prefer CSS selector or role+name. Screenshots are NOT the primary control surface.
+ */
+
+import { createInterface } from "node:readline";
+import { dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+const INSTALL_HINT =
+  "Playwright not available. From the GrokBoy repo run: " +
+  "cd tools/playwright && npm install && npx playwright install chromium";
+
+let browser = null;
+let context = null;
+let page = null;
+let lastUrl = null;
+
+function ok(id, extra = {}) {
+  return { id: id ?? null, ok: true, ...extra };
+}
+
+function fail(id, error, extra = {}) {
+  return {
+    id: id ?? null,
+    ok: false,
+    blocked: true,
+    error: String(error),
+    ...extra,
+  };
+}
+
+async function loadPlaywright() {
+  try {
+    return await import("playwright");
+  } catch (e) {
+    const err = new Error(`${INSTALL_HINT} (import failed: ${e.message})`);
+    err.code = "PLAYWRIGHT_MISSING";
+    throw err;
+  }
+}
+
+async function ensurePage() {
+  if (page) return page;
+  const { chromium } = await loadPlaywright();
+  try {
+    browser = await chromium.launch({ headless: true });
+  } catch (e) {
+    const err = new Error(
+      `${INSTALL_HINT} (chromium launch failed: ${e.message})`
+    );
+    err.code = "CHROMIUM_MISSING";
+    throw err;
+  }
+  context = await browser.newContext();
+  page = await context.newPage();
+  return page;
+}
+
+/** Accessibility-ish text snapshot: roles, names, and useful selectors — not pixels. */
+async function buildSnapshot(p) {
+  const nodes = await p.evaluate(() => {
+    const out = [];
+    const max = 400;
+    const interesting = new Set([
+      "a",
+      "button",
+      "input",
+      "textarea",
+      "select",
+      "option",
+      "h1",
+      "h2",
+      "h3",
+      "h4",
+      "h5",
+      "h6",
+      "label",
+      "li",
+      "summary",
+      "nav",
+      "main",
+      "form",
+      "img",
+      "table",
+      "th",
+      "td",
+    ]);
+
+    function cssPath(el) {
+      if (el.id) return `#${CSS.escape(el.id)}`;
+      const parts = [];
+      let cur = el;
+      while (cur && cur.nodeType === 1 && parts.length < 5) {
+        let part = cur.tagName.toLowerCase();
+        if (cur.id) {
+          parts.unshift(`#${CSS.escape(cur.id)}`);
+          break;
+        }
+        const parent = cur.parentElement;
+        if (parent) {
+          const siblings = [...parent.children].filter(
+            (c) => c.tagName === cur.tagName
+          );
+          if (siblings.length > 1) {
+            const idx = siblings.indexOf(cur) + 1;
+            part += `:nth-of-type(${idx})`;
+          }
+        }
+        parts.unshift(part);
+        cur = parent;
+      }
+      return parts.join(" > ");
+    }
+
+    const walker = document.createTreeWalker(
+      document.body || document.documentElement,
+      NodeFilter.SHOW_ELEMENT
+    );
+    let node = walker.currentNode;
+    while (node && out.length < max) {
+      const tag = node.tagName ? node.tagName.toLowerCase() : "";
+      const role =
+        node.getAttribute("role") ||
+        (tag === "a"
+          ? "link"
+          : tag === "button"
+            ? "button"
+            : tag === "input"
+              ? node.getAttribute("type") === "submit"
+                ? "button"
+                : "textbox"
+              : tag === "textarea"
+                ? "textbox"
+                : tag === "img"
+                  ? "img"
+                  : tag.startsWith("h") && tag.length === 2
+                    ? "heading"
+                    : null);
+      const name =
+        node.getAttribute("aria-label") ||
+        node.getAttribute("alt") ||
+        node.getAttribute("placeholder") ||
+        node.getAttribute("title") ||
+        (node.innerText || node.textContent || "").trim().slice(0, 120);
+      const href = node.getAttribute && node.getAttribute("href");
+      const type = node.getAttribute && node.getAttribute("type");
+      const value =
+        "value" in node && typeof node.value === "string"
+          ? String(node.value).slice(0, 80)
+          : null;
+
+      if (interesting.has(tag) || node.getAttribute("role") || node.id) {
+        const entry = {
+          tag,
+          role: role || tag,
+          name: name || "",
+          selector: cssPath(node),
+        };
+        if (href) entry.href = href;
+        if (type) entry.type = type;
+        if (value) entry.value = value;
+        if (node.id) entry.id = node.id;
+        out.push(entry);
+      }
+      node = walker.nextNode();
+    }
+    return out;
+  });
+
+  const title = await p.title();
+  const url = p.url();
+  const lines = nodes.map((n, i) => {
+    const bits = [`[${i}]`, n.role || n.tag];
+    if (n.name) bits.push(`name=${JSON.stringify(n.name)}`);
+    if (n.selector) bits.push(`sel=${n.selector}`);
+    if (n.href) bits.push(`href=${n.href}`);
+    if (n.type) bits.push(`type=${n.type}`);
+    if (n.value) bits.push(`value=${JSON.stringify(n.value)}`);
+    return bits.join(" ");
+  });
+
+  return {
+    url,
+    title,
+    count: nodes.length,
+    text: lines.join("\n"),
+    nodes,
+  };
+}
+
+async function resolveLocator(p, args) {
+  if (args.selector) {
+    return p.locator(String(args.selector)).first();
+  }
+  if (args.role) {
+    const opts = {};
+    if (args.name) opts.name = String(args.name);
+    return p.getByRole(String(args.role), opts).first();
+  }
+  if (args.text) {
+    return p.getByText(String(args.text), { exact: !!args.exact }).first();
+  }
+  if (args.label) {
+    return p.getByLabel(String(args.label)).first();
+  }
+  if (args.placeholder) {
+    return p.getByPlaceholder(String(args.placeholder)).first();
+  }
+  throw new Error(
+    "click/type requires selector, role(+name), text, label, or placeholder"
+  );
+}
+
+async function handle(req) {
+  const id = req.id ?? null;
+  const op = req.op || req.command;
+  if (!op) return fail(id, "missing op");
+
+  try {
+    switch (op) {
+      case "ping":
+        return ok(id, {
+          pong: true,
+          protocol: 1,
+          ops: [
+            "ping",
+            "navigate",
+            "snapshot",
+            "click",
+            "type",
+            "eval",
+            "close",
+            "status",
+          ],
+        });
+
+      case "status": {
+        return ok(id, {
+          browser_open: !!browser,
+          last_url: lastUrl,
+          page_url: page ? page.url() : null,
+        });
+      }
+
+      case "navigate": {
+        const url = req.url;
+        if (!url) return fail(id, "navigate: missing url");
+        const p = await ensurePage();
+        const resp = await p.goto(String(url), {
+          waitUntil: "domcontentloaded",
+          timeout: req.timeout_ms ?? 30000,
+        });
+        lastUrl = p.url();
+        return ok(id, {
+          url: lastUrl,
+          title: await p.title(),
+          status: resp ? resp.status() : null,
+        });
+      }
+
+      case "snapshot":
+      case "dom": {
+        const p = await ensurePage();
+        const snap = await buildSnapshot(p);
+        lastUrl = snap.url;
+        return ok(id, {
+          url: snap.url,
+          title: snap.title,
+          count: snap.count,
+          snapshot: snap.text,
+          nodes: snap.nodes.slice(0, 200),
+        });
+      }
+
+      case "click": {
+        const p = await ensurePage();
+        const loc = await resolveLocator(p, req);
+        await loc.click({ timeout: req.timeout_ms ?? 10000 });
+        lastUrl = p.url();
+        return ok(id, { clicked: true, url: lastUrl });
+      }
+
+      case "type": {
+        const p = await ensurePage();
+        const text = req.text ?? req.value;
+        if (text == null) return fail(id, "type: missing text");
+        const loc = await resolveLocator(p, req);
+        if (req.clear !== false) {
+          await loc.fill(String(text), { timeout: req.timeout_ms ?? 10000 });
+        } else {
+          await loc.type(String(text), { timeout: req.timeout_ms ?? 10000 });
+        }
+        lastUrl = p.url();
+        return ok(id, { typed: true, url: lastUrl });
+      }
+
+      case "eval": {
+        const p = await ensurePage();
+        const expression = req.expression ?? req.js ?? req.code;
+        if (!expression) return fail(id, "eval: missing expression");
+        // Evaluate as expression body; fail closed on throw.
+        const result = await p.evaluate((expr) => {
+          // eslint-disable-next-line no-eval
+          return eval(expr);
+        }, String(expression));
+        let serialized;
+        try {
+          serialized = JSON.parse(JSON.stringify(result));
+        } catch {
+          serialized = String(result);
+        }
+        return ok(id, { result: serialized, url: p.url() });
+      }
+
+      case "close": {
+        if (browser) {
+          await browser.close().catch(() => {});
+        }
+        browser = null;
+        context = null;
+        page = null;
+        return ok(id, { closed: true, last_url: lastUrl });
+      }
+
+      default:
+        return fail(id, `unknown op: ${op}`);
+    }
+  } catch (e) {
+    const extra = {};
+    if (e && e.code) extra.code = e.code;
+    return fail(id, e.message || e, extra);
+  }
+}
+
+function parseArgs(argv) {
+  const out = { cmd: null, selfTest: false, daemon: true };
+  for (let i = 2; i < argv.length; i++) {
+    const a = argv[i];
+    if (a === "--self-test") out.selfTest = true;
+    else if (a === "--cmd" || a === "-c") {
+      out.cmd = argv[++i];
+      out.daemon = false;
+    } else if (a === "--daemon") out.daemon = true;
+    else if (a === "--help" || a === "-h") out.help = true;
+  }
+  return out;
+}
+
+async function runSelfTest() {
+  const cases = [];
+
+  // Protocol: ping without playwright
+  let r = await handle({ id: "t1", op: "ping" });
+  cases.push(["ping", r.ok === true && r.pong === true]);
+
+  // Missing fields fail closed
+  r = await handle({ id: "t2", op: "navigate" });
+  cases.push(["navigate_missing_url", r.ok === false && r.blocked === true]);
+
+  r = await handle({ id: "t3", op: "type", selector: "#x" });
+  // ensurePage may fail if no playwright — either blocked missing text first
+  // type checks text before ensurePage... actually type checks text then ensurePage then resolveLocator
+  // missing text → fail before playwright
+  cases.push(["type_missing_text", r.ok === false]);
+
+  r = await handle({ id: "t4", op: "nope" });
+  cases.push(["unknown_op", r.ok === false]);
+
+  r = await handle({ id: "t5", op: "status" });
+  cases.push(["status", r.ok === true && r.browser_open === false]);
+
+  const failed = cases.filter(([, okv]) => !okv);
+  const summary = {
+    ok: failed.length === 0,
+    cases: Object.fromEntries(cases),
+    failed: failed.map(([n]) => n),
+  };
+  console.log(JSON.stringify(summary));
+  process.exit(failed.length === 0 ? 0 : 1);
+}
+
+async function main() {
+  const args = parseArgs(process.argv);
+  if (args.help) {
+    console.log(
+      JSON.stringify({
+        ok: true,
+        usage:
+          "browser_helper.mjs [--self-test] | [--cmd JSON] | (JSONL on stdin)",
+        install: INSTALL_HINT,
+      })
+    );
+    return;
+  }
+  if (args.selfTest) {
+    await runSelfTest();
+    return;
+  }
+  if (args.cmd) {
+    let req;
+    try {
+      req = JSON.parse(args.cmd);
+    } catch (e) {
+      console.log(JSON.stringify(fail(null, `invalid --cmd JSON: ${e.message}`)));
+      process.exit(1);
+      return;
+    }
+    const res = await handle(req);
+    console.log(JSON.stringify(res));
+    process.exit(res.ok ? 0 : 1);
+    return;
+  }
+
+  // JSONL daemon
+  const rl = createInterface({ input: process.stdin, crlfDelay: Infinity });
+  for await (const line of rl) {
+    const trimmed = line.trim();
+    if (!trimmed) continue;
+    let req;
+    try {
+      req = JSON.parse(trimmed);
+    } catch (e) {
+      console.log(
+        JSON.stringify(fail(null, `invalid JSON line: ${e.message}`))
+      );
+      continue;
+    }
+    const res = await handle(req);
+    console.log(JSON.stringify(res));
+    if (req.op === "close" || req.command === "close") {
+      // keep process alive unless parent closes stdin
+    }
+  }
+  if (browser) {
+    await browser.close().catch(() => {});
+  }
+}
+
+main().catch((e) => {
+  console.error(JSON.stringify(fail(null, e.message || e)));
+  process.exit(1);
+});
diff --git a/tools/playwright/package.json b/tools/playwright/package.json
new file mode 100644
index 0000000..37e97c4
--- /dev/null
+++ b/tools/playwright/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "grokboy-playwright-helper",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Optional Playwright DOM helper for GrokBoy (JSONL / one-shot CLI)",
+  "type": "module",
+  "main": "browser_helper.mjs",
+  "scripts": {
+    "self-test": "node browser_helper.mjs --self-test"
+  },
+  "dependencies": {
+    "playwright": "^1.49.0"
+  }
+}