//! Built-in tools: shell, files, completion, Playwright browser (P3), human handoff (P4),
//! confirm-before-post (P6).

use anyhow::{anyhow, Context, Result};
use serde_json::{json, Value};
use std::future::Future;
use std::path::{Component, Path, PathBuf};
use std::pin::Pin;
use std::sync::{Arc, Mutex};

use crate::browser::{self, LastUrlSlot};
use crate::confirm;
use crate::box_runtime::BoxHub;
use crate::mcp::McpHub;
use crate::model::ChatMessage;
use crate::subagents::Subagents;

pub type SharedCompleter = Arc<
    dyn Fn(
            Vec<ChatMessage>,
            Option<Value>,
        ) -> Pin<Box<dyn Future<Output = Result<ChatMessage>> + Send>>
        + Send
        + Sync,
>;

pub const MAX_READ_BYTES: usize = 256 * 1024;
pub const SHELL_TIMEOUT_SECS: u64 = 30;

/// Runtime context for tool execution.
#[derive(Clone)]
pub struct ToolContext {
    /// Default working directory for relative paths / shell.
    pub cwd: PathBuf,
    pub(crate) team: Option<std::sync::Arc<crate::team::TeamContext>>,
    /// 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,
    pub runtime: std::sync::Arc<crate::runtime::Runtime>,
    pub(crate) jobs: std::sync::Arc<crate::jobs::Jobs>,
    pub(crate) browser: std::sync::Arc<crate::browser_client::BrowserClient>,
    pub(crate) model: Arc<Mutex<Option<SharedCompleter>>>,
    pub(crate) subagents: Arc<Subagents>,
    pub(crate) mcp: Arc<McpHub>,
    pub(crate) box_hub: Arc<BoxHub>,
    pub(crate) subagent_depth: u32,
    /// When true, this context is a `computerUse` subagent and may call `computer`.
    pub(crate) computer_use: bool,
    /// When true (`run` / tests), wait inside the loop for background work.
    /// REPL sets this false so the prompt returns; completion revives later.
    pub hold_background: bool,
}

impl std::fmt::Debug for ToolContext {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("ToolContext")
            .field("cwd", &self.cwd)
            .field("subagent_depth", &self.subagent_depth)
            .field("computer_use", &self.computer_use)
            .finish()
    }
}

impl ToolContext {
    pub fn new(cwd: impl Into<PathBuf>) -> Self {
        let cwd = cwd.into();
        Self {
            cwd: cwd.clone(),
            team: None,
            workspace_root: Some(cwd.clone()),
            last_browser_url: std::sync::Arc::new(std::sync::Mutex::new(None)),
            runtime: std::sync::Arc::new(crate::runtime::Runtime::default()),
            jobs: Default::default(),
            browser: Default::default(),
            model: Arc::new(Mutex::new(None)),
            subagents: Arc::new(Subagents::default()),
            mcp: McpHub::load(&cwd).unwrap_or_else(|_| McpHub::empty()),
            box_hub: BoxHub::new(),
            subagent_depth: 0,
            computer_use: false,
            hold_background: true,
        }
    }

    pub async fn has_live_background(&self) -> bool {
        self.jobs.active().await || self.subagents.has_running()
    }

    pub fn has_parked_background(&self) -> bool {
        self.jobs.has_unreaped_exit() || self.subagents.has_completed()
    }

    pub async fn wait_background_progress(&self) {
        loop {
            if !self.has_live_background().await {
                return;
            }
            tokio::select! {
                _ = self.jobs.notify.notified() => return,
                _ = self.subagents.notified() => return,
                _ = tokio::time::sleep(std::time::Duration::from_millis(200)) => {
                    if !self.has_live_background().await {
                        return;
                    }
                }
            }
        }
    }

    pub fn with_runtime(mut self, runtime: std::sync::Arc<crate::runtime::Runtime>) -> Self {
        self.runtime = runtime;
        self
    }
    pub async fn shutdown(&self) {
        self.jobs.cancel().await;
        self.subagents.cancel_all().await;
        self.browser.close().await;
        if let Some(team) = &self.team {
            team.held_browser.lock().await.take();
        }
    }

    pub fn with_workspace(mut self, root: Option<PathBuf>) -> Self {
        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 {
    assemble_tool_definitions(false)
}

/// Tool list for this agent. A `computerUse` child gets `computer`; the parent does not.
pub fn tool_definitions_for(ctx: &ToolContext) -> Value {
    assemble_tool_definitions(ctx.computer_use)
}

fn assemble_tool_definitions(computer_use: bool) -> Value {
    let mut defs = json!([
        {
            "type": "function",
            "function": {
                "name": "external_shell",
                "description": "Run a shell command. Captures stdout, stderr, and exit code. Timeout 30s. cwd defaults to the session working directory.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "command": { "type": "string", "description": "Shell command to run" },
                        "cwd": { "type": "string", "description": "Optional working directory" }
                    },
                    "required": ["command"]
                }
            }
        },
        {
            "type": "function",
            "function": {
                "name": "external_list_dir",
                "description": "List entries in a directory (names only, sorted).",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "path": { "type": "string", "description": "Directory path (relative to cwd or absolute)" }
                    },
                    "required": ["path"]
                }
            }
        },
        {
            "type": "function",
            "function": {
                "name": "external_read_file",
                "description": "Read text in line segments (max 256KB per response). offset is zero-based; use next_offset when truncated.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "path": { "type": "string", "description": "File path" },
                        "offset": {"type":"integer","minimum":0},
                        "limit": {"type":"integer","minimum":1}
                    },
                    "required": ["path"]
                }
            }
        },
        {
            "type": "function",
            "function": {
                "name": "external_write_file",
                "description": "Write text to a file, creating parent directories as needed.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "path": { "type": "string", "description": "File path" },
                        "content": { "type": "string", "description": "File contents" }
                    },
                    "required": ["path", "content"]
                }
            }
        },
        {
            "type": "function",
            "function": {
                "name": "report_done",
                "description": "Signal that the task is complete. Stops the agent loop with a done verdict. Call once when finished; include a short summary in message.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "message": { "type": "string", "description": "Final summary for the user" }
                    },
                    "required": ["message"]
                }
            }
        },
        {
            "type": "function",
            "function": {
                "name": "report_blocked",
                "description": "Explain a blocker and offer 2–3 concrete alternative routes in options. With interactive input, wait for a choice and continue the SAME task; the runtime appends a stop option. Without input, return a blocked verdict. Prefer useful alternatives over repeated failed attempts.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "reason": { "type": "string", "description": "What failed, what was tried, and what remains possible" },
                        "options": { "type": "array", "items": { "type": "string" }, "minItems": 1, "maxItems": 3, "description": "Concrete next directions, excluding stop; e.g. manual login in current browser or draft content without login" }
                    },
                    "required": ["reason"]
                }
            }
        }
    ]);
    // Confirm-before-post (P6) + optional Playwright DOM tools.
    if let Some(arr) = defs.as_array_mut() {
        arr.push(confirm::confirm_tool_definition());
        arr.extend(browser::browser_tool_definitions());
        arr.extend(extra_tool_definitions());
        if computer_use {
            arr.push(crate::computer::tool_definition());
        }
        for tool in arr.iter_mut() {
            let name = tool["function"]["name"].as_str().unwrap_or("").to_owned();
            if name.starts_with("external_") {
                let description = tool["function"]["description"].as_str().unwrap_or("");
                tool["function"]["description"] = json!(format!("USER'S LOCAL COMPUTER, not the box. Use only for explicitly requested local files/environment; ordinary work belongs in shell/read on the box. {description}"));
            } else {
                match name.as_str() {
                    "box_shell" => tool["function"]["name"] = json!("shell"),
                    "box_read" => tool["function"]["name"] = json!("read"),
                    "box_await" => tool["function"]["name"] = json!("await_shell"),
                    _ => {}
                }
            }
        }
        arr.sort_by_key(|tool| tool["function"]["name"].as_str().unwrap_or("").starts_with("external_"));
    }
    defs
}

/// Tools that must be called alone (human wait / hard stop). `send_message` may mix.
pub fn is_completion_tool(name: &str) -> bool {
    matches!(
        name,
        "report_done"
            | "report_blocked"
            | "request_user_input"
            | "request_user_confirm"
            | "browser_handoff"
            | "request_box_help"
    )
}

/// User-visible delivery. Does not end the turn; a later no-tool response does.
pub fn is_delivery_tool(name: &str) -> bool {
    matches!(name, "send_message" | "report_progress" | "report_done")
}

pub(crate) fn is_parallel_safe(name: &str) -> bool {
    matches!(
        name,
        "external_list_dir"
            | "external_read_file"
            | "external_search_files"
            | "external_grep"
            | "external_glob"
            | "web_fetch"
                | "web_search"
            | "send_message"
            | "report_progress"
            | "update_plan"
            | "check_subagent"
            | "get_mcp_tools"
            | "get_mcp_server_status"
            | "box_read"
            | "read"
            | "screenshot"
    )
}

/// Resolve a user-supplied path against cwd and optionally enforce workspace_root.
pub fn resolve_path(ctx: &ToolContext, path: &str) -> Result<PathBuf> {
    let raw = Path::new(path);
    let joined = if raw.is_absolute() {
        raw.to_path_buf()
    } else {
        ctx.cwd.join(raw)
    };

    // Normalize without requiring the path to exist (for write_file parents).
    let resolved = normalize_path(&joined);

    if let Some(root) = &ctx.workspace_root {
        let root_norm = normalize_path(root);
        if !resolved.starts_with(&root_norm) {
            return Err(anyhow!(
                "path {:?} is outside workspace root {:?}",
                resolved,
                root_norm
            ));
        }
    }

    // Resolve existing ancestors too: lexical checks alone allow escaping via symlinks.
    if let Some(root) = &ctx.workspace_root {
        let real_root = std::fs::canonicalize(root).unwrap_or_else(|_| normalize_path(root));
        let mut ancestor = resolved.as_path();
        while !ancestor.exists() {
            if std::fs::symlink_metadata(ancestor).is_ok() {
                return Err(anyhow!("dangling symlink in path"));
            }
            ancestor = ancestor
                .parent()
                .ok_or_else(|| anyhow!("no existing path ancestor"))?;
        }
        if !std::fs::canonicalize(ancestor)?.starts_with(real_root) {
            return Err(anyhow!("symlink target outside workspace"));
        }
    }
    Ok(resolved)
}

fn normalize_path(path: &Path) -> PathBuf {
    let mut out = PathBuf::new();
    for comp in path.components() {
        match comp {
            Component::Prefix(p) => out.push(p.as_os_str()),
            Component::RootDir => out.push(Component::RootDir.as_os_str()),
            Component::CurDir => {}
            Component::ParentDir => {
                out.pop();
            }
            Component::Normal(c) => out.push(c),
        }
    }
    out
}

pub async fn execute_tool(ctx: &ToolContext, name: &str, arguments_json: &str) -> String {
    match execute_tool_guarded(ctx, name, arguments_json).await {
        Ok(v) => v.to_string(),
        Err(e) => json!({ "error": format!("{e:#}") }).to_string(),
    }
}

async fn execute_tool_guarded(ctx: &ToolContext, name: &str, arguments: &str) -> Result<Value> {
    // Plain names always select the box. Historical box_* names remain aliases.
    let name = match name {
        "shell" => "box_shell",
        "read" => "box_read",
        "await_shell" => "box_await",
        _ => name,
    };
    if let Some(team) = &ctx.team {
        let args: Value = serde_json::from_str(arguments)?;
        // `send_message` is overloaded: with `task_id` it steers another task, otherwise it is
        // the worker's user-facing voice and must reach the runtime like in single-agent mode.
        let task_scoped = name != "send_message" || args.get("task_id").is_some() || team.task.is_none();
        if crate::team::worker::is_team_tool(name) && task_scoped {
            if name == "wait_task" {
                if ctx.jobs.active().await {
                    return Err(anyhow!(
                        "finish or terminate the active command before waiting for another task"
                    ));
                }
                team.held_workspace.lock().await.take();
            }
            return team.tool(name, &args).await;
        }
        if team.task.is_none() {
            return Err(anyhow!(
                "foreground chat must delegate tool work to a background task"
            ));
        }
        if name == "report_done" && team.unfinished() {
            return Err(anyhow!(
                "child tasks are still active; wait for their results"
            ));
        }
        if !matches!(
            name,
            "report_done"
                | "report_blocked"
                | "report_progress"
                | "send_message"
                | "web_fetch"
                | "web_search"
                | "spawn_subagent"
                | "check_subagent"
                | "message_subagent"
                | "stop_subagent"
                | "get_mcp_tools"
                | "call_mcp_tool"
                | "get_mcp_server_status"
                | "add_mcp_server"
                | "remove_mcp_server"
                | "box_shell"
                | "box_read"
                | "box_await"
                | "copy_to_box"
                | "copy_from_box"
                | "screenshot"
                | "computer"
                | "request_box_help"
                | "update_plan"
                | "request_user_input"
                | "request_user_confirm"
                | "browser_handoff"
        ) {
            let service = team.service()?;
            let mut held = team.held_workspace.lock().await;
            if held.is_none() {
                *held = Some(service.workspace(&ctx.cwd)?.lock_owned().await);
            }
            let result = execute_tool_inner(ctx, name, arguments).await;
            if !ctx.jobs.active().await {
                held.take();
            }
            return result;
        }
        if matches!(
            name,
            "request_user_input" | "request_user_confirm" | "browser_handoff" | "request_box_help"
        ) && !ctx.jobs.active().await
        {
            team.held_workspace.lock().await.take();
        }
        // A live command must be finished before handing control to a human.
        if matches!(
            name,
            "request_user_input" | "request_user_confirm" | "browser_handoff" | "request_box_help"
        ) && ctx.jobs.active().await
        {
            return Err(anyhow!(
                "finish or terminate the active command before requesting human input"
            ));
        }
    }
    execute_tool_inner(ctx, name, arguments).await
}

async fn execute_tool_inner(ctx: &ToolContext, name: &str, arguments_json: &str) -> Result<Value> {
    let args: Value = serde_json::from_str(arguments_json)
        .with_context(|| format!("invalid tool arguments JSON for {name}"))?;

    match name {
        "external_shell" => tool_shell(ctx, &args).await,
        "external_list_dir" => tool_list_dir(ctx, &args).await,
        "external_read_file" => tool_read_file(ctx, &args).await,
        "external_search_files" => search_files(ctx, &args).await,
        "external_edit_file" => edit_file(ctx, &args).await,
        "external_exec_command" => {
            let cwd = resolve_path(ctx, args["cwd"].as_str().unwrap_or("."))?;
            ctx.jobs.exec(&cwd, &args).await
        }
        "external_write_stdin" => ctx.jobs.write(&args).await,
        "send_message" => tool_send_message(ctx, &args).await,
        "external_grep" => tool_grep(ctx, &args).await,
        "external_glob" => tool_glob(ctx, &args).await,
        "web_fetch" => crate::web::fetch(&args).await,
        "web_search" => crate::web::search(&args).await,
        "external_await_command" => ctx.jobs.write(&args).await,
        "spawn_subagent" => {
            let goal = required_text(&args, "goal")?;
            let kind = crate::subagents::parse_kind(
                args["kind"]
                    .as_str()
                    .or_else(|| args["subagent_type"].as_str()),
            )?;
            ctx.subagents.spawn(ctx, goal, args["title"].as_str(), kind)
        }
        "check_subagent" => tool_check_subagent(ctx, &args),
        "message_subagent" => {
            let id = required_text(&args, "subagent_id")?;
            let message = required_text(&args, "message")?;
            Ok(json!({"status": ctx.subagents.message(id, message)?}))
        }
        "stop_subagent" => {
            let id = required_text(&args, "subagent_id")?;
            Ok(json!({"status": ctx.subagents.stop(id).await?}))
        }
        "get_mcp_tools" => {
            ctx.mcp
                .get_tools(
                    args["server"].as_str().or(args["server_id"].as_str()),
                    args["tool_name"].as_str().or(args["toolName"].as_str()),
                    args["pattern"].as_str(),
                )
                .await
        }
        "call_mcp_tool" => {
            let server = required_text(&args, "server")
                .or_else(|_| required_text(&args, "server_id"))?;
            let tool = required_text(&args, "tool_name")
                .or_else(|_| required_text(&args, "toolName"))?;
            let arguments = args.get("arguments").cloned().unwrap_or(json!({}));
            ctx.mcp.call_tool(server, tool, arguments).await
        }
        "get_mcp_server_status" => {
            ctx.mcp
                .status(args["server"].as_str().or(args["server_id"].as_str()))
                .await
        }
        "add_mcp_server" => {
            let name = required_text(&args, "name")?;
            ctx.mcp
                .add(
                    name,
                    args["url"].as_str(),
                    crate::mcp::parse_headers(&args["headers"]),
                    args["command"].as_str(),
                    crate::mcp::parse_args_list(&args["args"]),
                    crate::mcp::parse_env(&args["env"]),
                )
                .await
        }
        "remove_mcp_server" => {
            let name = required_text(&args, "name")
                .or_else(|_| required_text(&args, "server"))
                .or_else(|_| required_text(&args, "server_id"))?;
            ctx.mcp.remove(name).await
        }
        "box_shell" => {
            let cmd = required_text(&args, "cmd").or_else(|_| required_text(&args, "command"))?;
            let block = args["block_until_ms"]
                .as_u64()
                .or(args["yield_time_ms"].as_u64())
                .unwrap_or(30_000);
            ctx.box_hub.shell(cmd, block).await
        }
        "box_read" => {
            ctx.box_hub
                .read(
                    required_text(&args, "path")?,
                    args["offset"].as_i64(),
                    args["limit"].as_i64(),
                )
                .await
        }
        "box_await" => {
            ctx.box_hub
                .await_job(required_text(&args, "session_id")?)
                .await
        }
        "copy_to_box" => {
            let host = resolve_path(ctx, required_text(&args, "computer_path")?)?;
            ctx.box_hub
                .copy_to_box(&host, args["box_path"].as_str())
                .await
        }
        "copy_from_box" => {
            let dest = args["computer_path"]
                .as_str()
                .map(|p| resolve_path(ctx, p))
                .transpose()?
                .unwrap_or_else(|| {
                    ctx.cwd.join(
                        Path::new(args["box_path"].as_str().unwrap_or("file"))
                            .file_name()
                            .unwrap_or_default(),
                    )
                });
            ctx.box_hub
                .copy_from_box(required_text(&args, "box_path")?, &dest)
                .await
        }
        "screenshot" => {
            let dest = ctx.cwd.join(".grokboy-output").join(format!(
                "box-shot-{}.png",
                uuid::Uuid::new_v4()
            ));
            ctx.box_hub.screenshot(&dest).await
        }
        "computer" => {
            if !ctx.computer_use {
                return Err(anyhow!(
                    "computer is only available to a computerUse subagent. Delegate with spawn_subagent kind=computerUse. The parent may only take a read-only screenshot."
                ));
            }
            let dest = ctx.cwd.join(".grokboy-output").join(format!(
                "box-shot-{}.png",
                uuid::Uuid::new_v4()
            ));
            let actions = crate::computer::parse_computer_call(&args)?;
            ctx.box_hub.computer(&actions, &dest).await
        }
        "request_box_help" => {
            let instruction = required_text(&args, "instruction")?;
            let ready = ctx.box_hub.ensure_ready().await?;
            let viewer = ready["viewer_url"]
                .as_str()
                .unwrap_or("")
                .to_string();
            ctx.runtime.deliver(&format!(
                "請在我的電腦上操作：{instruction}\n打開 {viewer} ，做完後在這裡回覆「好了」。"
            ));
            ctx.runtime.park_question(&json!({
                "kind": "box_help",
                "question": format!("{instruction}\n打開我的電腦：{viewer}"),
                "options": ["我已完成，請檢查畫面後繼續", "停止這份工作"],
                "viewer_url": viewer,
                "reason": args["reason"],
            }))
        }
        "report_progress" => {
            let message = required_text(&args, "message")?;
            ctx.runtime.deliver(message);
            ctx.runtime.emit(crate::AgentEvent::Progress {
                message: message.into(),
            });
            Ok(json!({"emitted":true,"sent":true}))
        }
        "update_plan" => ctx.runtime.update_plan(&args),
        "request_user_input" => {
            required_text(&args, "question")?;
            let mut question = args.clone();
            if question.get("kind").is_none() {
                question["kind"] = json!("input");
            }
            ctx.runtime.park_question(&question)
        }
        "external_write_file" => tool_write_file(ctx, &args).await,
        "report_done" => {
            let message = required_text(&args, "message")?;
            ctx.runtime.deliver(message);
            tool_report_done(&args)
        }
        "report_blocked" => recovery_choice(ctx, &args).await,
        "request_user_confirm" if ctx.runtime.input.is_some() => human_confirm(ctx, &args).await,
        "request_user_confirm" => confirm::execute_request_user_confirm_async(&args).await,
        name if name.starts_with("browser_") => browser_tool(ctx, name, &args).await,
        other => Err(anyhow!("unknown tool: {other}")),
    }
}

fn tool_report_done(args: &Value) -> Result<Value> {
    let message = args
        .get("message")
        .and_then(|v| v.as_str())
        .filter(|s| !s.trim().is_empty())
        .ok_or_else(|| anyhow!("report_done: missing 'message'"))?;
    Ok(json!({
        "status": "done",
        "message": message,
    }))
}

async fn recovery_choice(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let blocked = tool_report_blocked(args)?;
    if ctx.jobs.active().await {
        return Err(anyhow!(
            "finish or terminate the active command before asking for a recovery choice"
        ));
    }
    if let Some(team) = &ctx.team {
        team.held_workspace.lock().await.take();
    }
    let mut options = recovery_options(
        args,
        &["換一種方法處理目前的阻礙", "先完成不受阻礙影響的部分"],
    )?;
    options.push("停止這份工作".into());
    let question = json!({"kind":"recovery","question":format!("{}\n接下來你想怎麼做？",blocked["reason"].as_str().unwrap_or("目前遇到阻礙")),"options":options});
    let mut parked = ctx.runtime.park_question(&question)?;
    parked["status"] = json!("blocked");
    parked["reason"] = blocked["reason"].clone();
    Ok(parked)
}
fn recovery_options(args: &Value, defaults: &[&str]) -> Result<Vec<String>> {
    match args.get("options") {
        None => Ok(defaults.iter().map(|s| s.to_string()).collect()),
        Some(value) => {
            let values = value
                .as_array()
                .filter(|a| !a.is_empty() && a.len() <= 3)
                .ok_or_else(|| anyhow!("options must contain 1–3 next directions"))?;
            values
                .iter()
                .map(|v| {
                    v.as_str()
                        .filter(|s| !s.trim().is_empty() && s.len() <= 1000)
                        .map(str::to_string)
                        .ok_or_else(|| {
                            anyhow!("each option must be nonempty text, at most 1000 bytes")
                        })
                })
                .collect()
        }
    }
}

fn tool_report_blocked(args: &Value) -> Result<Value> {
    let reason = args
        .get("reason")
        .and_then(|v| v.as_str())
        .filter(|s| !s.trim().is_empty())
        .ok_or_else(|| anyhow!("report_blocked: missing 'reason'"))?;
    Ok(json!({
        "status": "blocked",
        "reason": reason,
    }))
}

async fn tool_shell(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let command = args
        .get("command")
        .and_then(|v| v.as_str())
        .ok_or_else(|| anyhow!("shell: missing 'command'"))?;

    let cwd = if let Some(c) = args.get("cwd").and_then(|v| v.as_str()) {
        resolve_path(ctx, c)?
    } else {
        ctx.cwd.clone()
    };

    if !cwd.is_dir() {
        return Err(anyhow!("shell cwd is not a directory: {}", cwd.display()));
    }

    let mut result = ctx
        .jobs
        .exec(
            &cwd,
            &json!({"cmd":command,"timeout_ms":SHELL_TIMEOUT_SECS*1000,"yield_time_ms":10000}),
        )
        .await?;
    let mut stdout = result["stdout"].as_str().unwrap_or("").to_string();
    let mut stderr = result["stderr"].as_str().unwrap_or("").to_string();
    while result["running"] == true {
        result = ctx
            .jobs
            .write(&json!({"session_id":result["session_id"],"yield_time_ms":10000}))
            .await?;
        if stdout.len() < 64 * 1024 {
            stdout.push_str(result["stdout"].as_str().unwrap_or(""));
        }
        if stderr.len() < 32 * 1024 {
            stderr.push_str(result["stderr"].as_str().unwrap_or(""));
        }
    }
    result["stdout"] = json!(truncate_output(&stdout, 64 * 1024));
    result["stderr"] = json!(truncate_output(&stderr, 32 * 1024));
    result["command"] = json!(command);
    result["cwd"] = json!(cwd);
    if result["timed_out"] == true {
        result["error"] = json!("shell command timed out after 30s");
    }
    Ok(result)
}

async fn tool_list_dir(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let path = args
        .get("path")
        .and_then(|v| v.as_str())
        .ok_or_else(|| anyhow!("list_dir: missing 'path'"))?;
    let dir = resolve_path(ctx, path)?;
    let mut rd = tokio::fs::read_dir(&dir)
        .await
        .with_context(|| format!("list_dir: {}", dir.display()))?;

    let mut entries = Vec::new();
    while let Some(ent) = rd.next_entry().await? {
        let name = ent.file_name().to_string_lossy().to_string();
        let file_type = ent.file_type().await?;
        let kind = if file_type.is_dir() {
            "dir"
        } else if file_type.is_symlink() {
            "symlink"
        } else {
            "file"
        };
        entries.push(json!({ "name": name, "kind": kind }));
    }
    entries.sort_by(|a, b| {
        a["name"]
            .as_str()
            .unwrap_or("")
            .cmp(b["name"].as_str().unwrap_or(""))
    });

    Ok(json!({
        "path": dir.display().to_string(),
        "entries": entries,
    }))
}

async fn tool_read_file(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let path = args
        .get("path")
        .and_then(|v| v.as_str())
        .ok_or_else(|| anyhow!("read_file: missing 'path'"))?;
    let file = resolve_path(ctx, path)?;
    use tokio::io::{AsyncBufReadExt, BufReader};
    let offset = args["offset"].as_u64().unwrap_or(0);
    let limit = args["limit"].as_u64().unwrap_or(2000).clamp(1, 10000);
    let mut reader = BufReader::new(tokio::fs::File::open(&file).await?);
    let mut content = String::new();
    let mut line = Vec::new();
    let mut number = 0;
    let mut more = false;
    loop {
        line.clear();
        // Bound a single line as well as the whole response.
        use tokio::io::AsyncReadExt;
        let n = (&mut reader)
            .take((MAX_READ_BYTES + 1) as u64)
            .read_until(b'\n', &mut line)
            .await?;
        if n == 0 {
            break;
        }
        if line.len() > MAX_READ_BYTES {
            return Err(anyhow!(
                "line exceeds 256KB; use a command to inspect the file"
            ));
        }
        if number >= offset {
            if number - offset >= limit || content.len() + line.len() > MAX_READ_BYTES {
                more = true;
                break;
            }
            content.push_str(&String::from_utf8_lossy(&line));
        }
        number += 1;
    }
    Ok(
        json!({"path":file,"bytes":content.len(),"content":content,"offset":offset,"next_offset":number,"truncated":more}),
    )
}

async fn tool_write_file(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let path = args
        .get("path")
        .and_then(|v| v.as_str())
        .ok_or_else(|| anyhow!("write_file: missing 'path'"))?;
    let content = args
        .get("content")
        .and_then(|v| v.as_str())
        .ok_or_else(|| anyhow!("write_file: missing 'content'"))?;
    let file = resolve_path(ctx, path)?;
    if let Some(parent) = file.parent() {
        tokio::fs::create_dir_all(parent)
            .await
            .with_context(|| format!("write_file create_dir_all: {}", parent.display()))?;
    }
    tokio::fs::write(&file, content.as_bytes())
        .await
        .with_context(|| format!("write_file: {}", file.display()))?;
    Ok(json!({
        "path": file.display().to_string(),
        "bytes_written": content.len(),
    }))
}

fn truncate_output(s: &str, max: usize) -> String {
    if s.len() <= max {
        return s.to_string();
    }
    let mut end = max;
    while end > 0 && !s.is_char_boundary(end) {
        end -= 1;
    }
    format!(
        "{}…\n[truncated {} bytes]",
        &s[..end],
        s.len().saturating_sub(end)
    )
}

fn required_text<'a>(args: &'a Value, key: &str) -> Result<&'a str> {
    args[key]
        .as_str()
        .filter(|s| !s.trim().is_empty())
        .ok_or_else(|| anyhow!("missing nonempty '{key}'"))
}
fn def(name: &str, description: &str, properties: Value, required: Value) -> Value {
    json!({"type":"function","function":{"name":name,"description":description,"parameters":{"type":"object","properties":properties,"required":required}}})
}
fn extra_tool_definitions() -> Vec<Value> {
    vec![
        def("send_message","Your only voice. The user never sees plain assistant text. Use {\"type\":\"text\",\"content\":\"...\"} for replies, progress, and results. Use {\"type\":\"widget\",\"widget\":{\"prompt\":\"...\",\"options\":[{\"label\":\"...\",\"value\":\"...\"}]}} to ask a decision; that ends the turn. After delivering a result, respond with NO tool calls to end the turn.",json!({"type":{"type":"string","enum":["text","widget"]},"content":{"type":"string"},"widget":{"type":"object","properties":{"prompt":{"type":"string"},"options":{"type":"array","items":{"type":"object","properties":{"label":{"type":"string"},"value":{"type":"string"}},"required":["label"]}}},"required":["prompt","options"]}}),json!(["type"])),
        def("report_progress","Alias of send_message text. Continues the turn.",json!({"message":{"type":"string"}}),json!(["message"])),
        def("update_plan","Maintain a short task checklist. At most one in_progress. After marking a step completed, send_message the finding to the user in the same beat. Explain changes to step text/order.",json!({"explanation":{"type":"string"},"plan":{"type":"array","items":{"type":"object","properties":{"step":{"type":"string"},"status":{"type":"string","enum":["pending","in_progress","completed"]}},"required":["step","status"]}}}),json!(["plan"])),
        def("request_user_input","Ask only for missing information you cannot discover with tools. Ends the turn; the user's next message is the answer. Prefer send_message widget for decisions.",json!({"question":{"type":"string"},"options":{"type":"array","items":{"type":"string"}},"timeout_secs":{"type":"integer"}}),json!(["question"])),
        def("external_exec_command","Run a command. Waits up to block_until_ms (default 30000) then backgrounds; use external_await_command/external_write_stdin to observe. Set block_until_ms to 0 to background immediately. Default kill timeout 10 minutes. No PTY.",json!({"cmd":{"type":"string"},"cwd":{"type":"string"},"block_until_ms":{"type":"integer"},"yield_time_ms":{"type":"integer"},"timeout_ms":{"type":"integer"},"max_output_bytes":{"type":"integer"}}),json!(["cmd"])),
        def("external_write_stdin","Read incremental command output, send input, close stdin or terminate a command. Controlled waiting is not a no-progress loop.",json!({"session_id":{"type":"string"},"chars":{"type":"string"},"close_stdin":{"type":"boolean"},"terminate":{"type":"boolean"},"block_until_ms":{"type":"integer"},"yield_time_ms":{"type":"integer"},"max_output_bytes":{"type":"integer"}}),json!(["session_id"])),
        def("external_await_command","Wait for more output from a background command without holding a tight poll loop. Same arguments as external_write_stdin.",json!({"session_id":{"type":"string"},"block_until_ms":{"type":"integer"},"yield_time_ms":{"type":"integer"},"max_output_bytes":{"type":"integer"},"terminate":{"type":"boolean"}}),json!(["session_id"])),
        def("external_grep","Search workspace file contents with a regular expression. Skips symlinks, .git, node_modules, target and output folders.",json!({"pattern":{"type":"string"},"path":{"type":"string"},"glob":{"type":"string"},"limit":{"type":"integer"}}),json!(["pattern"])),
        def("external_glob","Find files by name glob (e.g. **/*.rs) under a path.",json!({"pattern":{"type":"string"},"path":{"type":"string"},"limit":{"type":"integer"}}),json!(["pattern"])),
        def("web_search","Search public web via the configured remote service. Does not open a browser or use browser logins.",json!({"searchTerm":{"type":"string"},"explanation":{"type":"string"}}),json!(["searchTerm"])),
        def("web_fetch","Fetch a public URL via the configured remote web service. No browser cookies, local profile, localhost access or JavaScript browser session.",json!({"url":{"type":"string"},"max_bytes":{"type":"integer"}}),json!(["url"])),
        def("spawn_subagent","Start a background subagent for a self-contained chunk of work. Returns immediately with subagent_id. Do not wait or poll; keep working or end the turn — you are revived automatically when it finishes. kind=computerUse delegates a GUI/desktop task that drives MY computer by screenshot/click/move/drag/type/key/scroll/wait; only one computerUse may run at a time because they share the screen. Prefer browser_* for ordinary web; use computerUse for GUI apps, file dialogs, drag, or sites that defeat page-level automation.",json!({"goal":{"type":"string"},"title":{"type":"string"},"kind":{"type":"string","enum":["general","computerUse"],"description":"general (default) or computerUse"},"subagent_type":{"type":"string","description":"Alias of kind (Grok Bot Task subagent_type)"}}),json!(["goal"])),
        def("check_subagent","Inspect a running background subagent (status, elapsed time, recent tools). Omit subagent_id to list all. Not for polling completion.",json!({"subagent_id":{"type":"string"}}),json!([])),
        def("message_subagent","Inject an instruction into a running subagent without aborting it. It keeps its context.",json!({"subagent_id":{"type":"string"},"message":{"type":"string"}}),json!(["subagent_id","message"])),
        def("stop_subagent","Abort a running background subagent.",json!({"subagent_id":{"type":"string"}}),json!(["subagent_id"])),
        def("get_mcp_tools","Grok Bot GetMcpTools: list installed MCP servers and their tool schemas. Pass server to inspect one connector; tool_name for a single schema; pattern to search. Always read the schema before CallMcpTool.",json!({"server":{"type":"string"},"tool_name":{"type":"string"},"pattern":{"type":"string"}}),json!([])),
        def("call_mcp_tool","Grok Bot CallMcpTool: invoke a live MCP tool. server is the identifier from GetMcpTools, tool_name is the tool, arguments is the JSON object from its inputSchema. Prefer a connector over the browser for that service.",json!({"server":{"type":"string"},"tool_name":{"type":"string"},"arguments":{"type":"object"}}),json!(["server","tool_name"])),
        def("get_mcp_server_status","List configured MCP servers (connected/configured/error). Pass server for one identifier.",json!({"server":{"type":"string"}}),json!([])),
        def("add_mcp_server","Install an MCP server. Remote: name + url (https) + optional headers. Local stdio: name + command + args + optional env. Ask the user for secrets; do not put credentials in the URL.",json!({"name":{"type":"string"},"url":{"type":"string"},"headers":{"type":"object"},"command":{"type":"string"},"args":{"type":"array","items":{"type":"string"}},"env":{"type":"object"}}),json!(["name"])),
        def("remove_mcp_server","Remove an installed MCP server by name/identifier.",json!({"name":{"type":"string"}}),json!(["name"])),
        def("box_shell","Run a command on MY computer (the box Linux VM), not the user's. cwd is /workspace. Default block_until_ms 30000; 0 backgrounds. Prefer this for installs, experiments, and anything that should not touch the user's machine.",json!({"cmd":{"type":"string"},"block_until_ms":{"type":"integer"}}),json!(["cmd"])),
        def("box_read","Read a UTF-8 file on MY computer. Paths are under /workspace or /home/box.",json!({"path":{"type":"string"},"offset":{"type":"integer"},"limit":{"type":"integer"}}),json!(["path"])),
        def("box_await","Wait for a background box_shell session on MY computer.",json!({"session_id":{"type":"string"}}),json!(["session_id"])),
        def("copy_to_box","Copy a file from the USER's computer onto MY computer (verbatim). computer_path is an External/read_file path; default box dest is /workspace/uploads/<name>.",json!({"computer_path":{"type":"string"},"box_path":{"type":"string"}}),json!(["computer_path"])),
        def("copy_from_box","Copy a file from MY computer onto the USER's computer. box_path under /workspace or /home/box.",json!({"box_path":{"type":"string"},"computer_path":{"type":"string"}}),json!(["box_path"])),
        def("screenshot","Read-only capture of MY computer's screen. I cannot click, type, or scroll; this is to see the desktop or check on a running computerUse subagent. Returns a PNG path on the user's machine plus the viewer URL. Delegate clicks to spawn_subagent kind=computerUse.",json!({}),json!([])),
        def("request_box_help","Hand MY computer to the user for a login, 2FA, captcha, or payment. Ends the turn. Do not first ask whether to hand it over. instruction is one line. Next user message is the hand-back.",json!({"instruction":{"type":"string"},"reason":{"type":"string","enum":["auth","captcha","payment","other"]}}),json!(["instruction"])),
        def("external_search_files","Search workspace file names or literal text (not regex). Skips symlinks, .git, node_modules, target and output folders. Bounded results include line numbers.",json!({"path":{"type":"string"},"query":{"type":"string"},"mode":{"type":"string","enum":["content","name"]},"limit":{"type":"integer"}}),json!(["query"])),
        def("external_edit_file","Replace a unique exact old_text match in a UTF-8 file. Fails if missing or ambiguous; read again before retrying.",json!({"path":{"type":"string"},"old_text":{"type":"string"},"new_text":{"type":"string"}}),json!(["path","old_text","new_text"])),
    ]
}

fn tool_check_subagent(ctx: &ToolContext, args: &Value) -> Result<Value> {
    if let Some(id) = args["subagent_id"].as_str().filter(|s| !s.trim().is_empty()) {
        return match ctx.subagents.get_running(id) {
            Some(info) => Ok(json!({
                "subagent_id": info.id,
                "title": info.title,
                "goal": info.goal,
                "kind": info.kind,
                "elapsed_ms": info.elapsed_ms,
                "tool_call_count": info.tool_call_count,
                "recent": info.recent,
                "status": "running",
            })),
            None => Ok(json!({
                "error": format!("no running subagent {id}"),
                "running": ctx.subagents.list_running().iter().map(|i| &i.id).collect::<Vec<_>>(),
            })),
        };
    }
    let running = ctx.subagents.list_running();
    Ok(json!({"running": running.iter().map(|i| json!({"subagent_id":i.id,"title":i.title,"kind":i.kind,"elapsed_ms":i.elapsed_ms,"tool_call_count":i.tool_call_count})).collect::<Vec<_>>()}))
}

async fn tool_send_message(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let kind = args["type"].as_str().unwrap_or("text");
    if kind == "widget" {
        let widget = args
            .get("widget")
            .ok_or_else(|| anyhow!("widget is required when type is widget"))?;
        let prompt = widget["prompt"]
            .as_str()
            .filter(|s| !s.trim().is_empty())
            .ok_or_else(|| anyhow!("widget.prompt is required"))?;
        let options = widget["options"]
            .as_array()
            .filter(|a| !a.is_empty() && a.len() <= 6)
            .ok_or_else(|| anyhow!("widget.options must contain 1–6 choices"))?;
        let labels: Vec<String> = options
            .iter()
            .map(|o| {
                o["value"]
                    .as_str()
                    .or(o["label"].as_str())
                    .unwrap_or("")
                    .to_string()
            })
            .filter(|s| !s.trim().is_empty())
            .collect();
        if labels.is_empty() {
            return Err(anyhow!("widget options need nonempty label or value"));
        }
        ctx.runtime.deliver(prompt);
        let question = json!({"kind":"widget","question":prompt,"options":labels});
        let parked = ctx.runtime.park_question(&question)?;
        return Ok(json!({"sent":true,"type":"widget","yield_turn":true,"question":parked["question"]}));
    }
    let content = args["content"]
        .as_str()
        .or(args["message"].as_str())
        .filter(|s| !s.trim().is_empty())
        .ok_or_else(|| anyhow!("content is required for text send_message"))?;
    ctx.runtime.deliver(content);
    Ok(json!({"sent":true,"type":"text"}))
}

fn glob_to_regex(pattern: &str) -> Result<regex::Regex> {
    let mut re = String::from("(?s)^");
    let chars: Vec<char> = pattern.chars().collect();
    let mut i = 0;
    while i < chars.len() {
        match chars[i] {
            '*' if chars.get(i + 1) == Some(&'*') => {
                if chars.get(i + 2) == Some(&'/') {
                    re.push_str("(?:.*/)?");
                    i += 3;
                } else {
                    re.push_str(".*");
                    i += 2;
                }
            }
            '*' => {
                re.push_str("[^/]*");
                i += 1;
            }
            '?' => {
                re.push_str("[^/]");
                i += 1;
            }
            c if ".+()[]{}|^$\\".contains(c) => {
                re.push('\\');
                re.push(c);
                i += 1;
            }
            c => {
                re.push(c);
                i += 1;
            }
        }
    }
    re.push('$');
    regex::Regex::new(&re).map_err(|e| anyhow!("invalid glob: {e}"))
}

fn skipped_dir(name: &str) -> bool {
    matches!(
        name,
        ".git" | "node_modules" | "target" | ".grokboy-output"
    )
}

async fn walk_files(root: PathBuf, limit_scan: usize) -> Result<Vec<PathBuf>> {
    tokio::task::spawn_blocking(move || -> Result<Vec<PathBuf>> {
        let mut stack = vec![root];
        let mut files = vec![];
        let mut scanned = 0;
        while let Some(path) = stack.pop() {
            scanned += 1;
            if scanned > limit_scan {
                break;
            }
            let meta = match std::fs::symlink_metadata(&path) {
                Ok(m) => m,
                Err(_) => continue,
            };
            if meta.file_type().is_symlink() {
                continue;
            }
            if meta.is_dir() {
                let mut children = std::fs::read_dir(&path)?
                    .filter_map(|e| e.ok())
                    .filter(|e| !e.file_name().to_str().is_some_and(skipped_dir))
                    .map(|e| e.path())
                    .collect::<Vec<_>>();
                children.sort();
                stack.extend(children.into_iter().rev());
            } else if meta.is_file() {
                files.push(path);
            }
        }
        Ok(files)
    })
    .await?
}

async fn tool_glob(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let pattern = required_text(args, "pattern")?;
    let re = glob_to_regex(pattern)?;
    let root = resolve_path(ctx, args["path"].as_str().unwrap_or("."))?;
    let limit = args["limit"].as_u64().unwrap_or(200).clamp(1, 1000) as usize;
    let files = walk_files(root.clone(), 10_000).await?;
    let root_norm = root.to_string_lossy().trim_end_matches('/').to_string();
    let mut matches = vec![];
    for path in files {
        let rel = path
            .to_string_lossy()
            .strip_prefix(&root_norm)
            .unwrap_or(path.to_string_lossy().as_ref())
            .trim_start_matches('/')
            .to_string();
        if re.is_match(&rel) || re.is_match(path.file_name().and_then(|n| n.to_str()).unwrap_or(""))
        {
            matches.push(json!({"path": path}));
            if matches.len() >= limit {
                break;
            }
        }
    }
    Ok(json!({"matches":matches,"truncated":matches.len()>=limit,"pattern":pattern}))
}

async fn tool_grep(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let pattern = required_text(args, "pattern")?.to_string();
    let re = regex::Regex::new(&pattern).map_err(|e| anyhow!("invalid regex: {e}"))?;
    let root = resolve_path(ctx, args["path"].as_str().unwrap_or("."))?;
    let limit = args["limit"].as_u64().unwrap_or(50).clamp(1, 200) as usize;
    let name_glob = args["glob"].as_str().map(glob_to_regex).transpose()?;
    let files = walk_files(root, 10_000).await?;
    let mut matches = vec![];
    let mut truncated = false;
    for path in files {
        if let Some(g) = &name_glob {
            let name = path.file_name().and_then(|n| n.to_str()).unwrap_or("");
            if !g.is_match(name) {
                continue;
            }
        }
        let meta = match std::fs::metadata(&path) {
            Ok(m) => m,
            Err(_) => continue,
        };
        if meta.len() > 2 * 1024 * 1024 {
            continue;
        }
        let Ok(text) = std::fs::read_to_string(&path) else {
            continue;
        };
        for (i, line) in text.lines().enumerate() {
            if re.is_match(line) {
                matches.push(json!({"path":path,"line":i+1,"text":line.chars().take(500).collect::<String>()}));
                if matches.len() >= limit {
                    truncated = true;
                    break;
                }
            }
        }
        if truncated {
            break;
        }
    }
    Ok(json!({"matches":matches,"truncated":truncated,"pattern":pattern}))
}

async fn search_files(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let query = required_text(args, "query")?.to_string();
    let root = resolve_path(ctx, args["path"].as_str().unwrap_or("."))?;
    let limit = args["limit"].as_u64().unwrap_or(50).clamp(1, 200) as usize;
    let names = args["mode"].as_str() == Some("name");
    tokio::task::spawn_blocking(move || -> Result<Value> {
        let mut stack=vec![root]; let mut results=vec![]; let mut scanned=0; let mut truncated=false;
        while let Some(path)=stack.pop() {
            scanned+=1; if scanned>10000 || results.len()>=limit { truncated=true; break; }
            let meta=std::fs::symlink_metadata(&path)?;
            if meta.file_type().is_symlink() { continue; }
            if meta.is_dir() {
                let mut children=std::fs::read_dir(path)?.filter_map(|e|e.ok()).filter(|e|!matches!(e.file_name().to_str(),Some(".git"|"node_modules"|"target"|".grokboy-output"))).map(|e|e.path()).collect::<Vec<_>>();
                children.sort(); stack.extend(children.into_iter().rev());
            } else if meta.is_file() {
                if names { if path.file_name().unwrap_or_default().to_string_lossy().contains(&query) { results.push(json!({"path":path})); } }
                else if meta.len()<=2*1024*1024 {
                    if let Ok(text)=std::fs::read_to_string(&path) {
                        for (i,line) in text.lines().enumerate() {
                            if line.contains(&query) { results.push(json!({"path":path,"line":i+1,"text":line.chars().take(500).collect::<String>()})); if results.len()>=limit { truncated=true; break; } }
                        }
                    }
                }
            }
        }
        Ok(json!({"matches":results,"truncated":truncated,"scanned":scanned}))
    }).await?
}
async fn edit_file(ctx: &ToolContext, args: &Value) -> Result<Value> {
    let path = std::fs::canonicalize(resolve_path(ctx, required_text(args, "path")?)?)?;
    let old = required_text(args, "old_text")?;
    let new = args["new_text"]
        .as_str()
        .ok_or_else(|| anyhow!("missing new_text"))?;
    if tokio::fs::metadata(&path).await?.len() > 8 * 1024 * 1024 {
        return Err(anyhow!("edit_file supports files up to 8MB"));
    }
    let content = tokio::fs::read_to_string(&path).await?;
    let first = content.find(old);
    let ambiguous = first.is_some_and(|i| {
        content[i + content[i..].chars().next().unwrap().len_utf8()..].contains(old)
    });
    if first.is_none() || ambiguous {
        return Err(anyhow!("old_text must match exactly once; no file changed"));
    }
    let updated = content.replacen(old, new, 1);
    let temp = path.with_extension(format!("{}.tmp", uuid::Uuid::new_v4()));
    // No await between temp creation and rename: cancellation cannot leave a half-written target.
    std::fs::write(&temp, &updated)?;
    std::fs::set_permissions(&temp, std::fs::metadata(&path)?.permissions())?;
    std::fs::rename(&temp, &path)?;
    Ok(json!({"path":path,"replacements":1,"bytes_written":updated.len()}))
}
async fn human_confirm(ctx: &ToolContext, args: &Value) -> Result<Value> {
    required_text(args, "reason")?;
    if let Some(auto) = confirm::confirm_auto_from_env() {
        return Ok(
            json!({"approved":matches!(auto,confirm::ConfirmWait::Approved),"status":if matches!(auto,confirm::ConfirmWait::Approved){"approved"}else{"denied"}}),
        );
    }
    let mut prompt = args.clone();
    prompt["kind"] = json!("confirm");
    prompt["question"] = json!(format!(
        "{}\n輸入 yes/y 或 Enter 核准；no/abort 拒絕。",
        args["reason"].as_str().unwrap()
    ));
    prompt["options"] = json!(["yes", "no"]);
    ctx.runtime.park_question(&prompt)
}
async fn browser_tool(ctx: &ToolContext, name: &str, args: &Value) -> Result<Value> {
    if name == "browser_release" {
        ctx.browser.close().await;
        if let Some(team) = &ctx.team {
            team.held_browser.lock().await.take();
        }
        return Ok(json!({"released":true,"login_state":"persistent profile retained"}));
    }
    if let Some(team) = &ctx.team {
        let mut held = team.held_browser.lock().await;
        if held.is_none() {
            let service = team.service()?;
            let task = service.store.task(
                team.task
                    .as_deref()
                    .ok_or_else(|| anyhow!("delegate browser work"))?,
            )?;
            let guard = match service.browser_lock(if crate::browser_client::local_browser_enabled() { &task.owner_id } else { "box-shared-browser" }).try_lock_owned() {
                Ok(guard) => guard,
                Err(_) => {
                    return Ok(
                        json!({"error":"browser_busy","instruction":"Another task owns this owner's browser, possibly during human handoff. Do independent work or ask it to browser_release. Do not retry repeatedly or interpret this as logged out."}),
                    )
                }
            };
            let profile = service
                .browser_profile(&task.owner_id, &crate::team::data_dir().join("profiles"))?;
            *ctx.runtime.browser_profile.lock().unwrap() = Some(profile);
            *held = Some(guard);
        }
    }
    let op = name.strip_prefix("browser_").unwrap_or(name);
    let mut req = args.clone();
    req["op"] = json!(if op == "dom" { "snapshot" } else { op });
    if op == "upload" && crate::browser_client::local_browser_enabled() {
        req["path"] = json!(std::fs::canonicalize(resolve_path(
            ctx,
            required_text(args, "path")?
        )?)?);
    }
    if op == "download" && crate::browser_client::local_browser_enabled() {
        let path = resolve_path(ctx, required_text(args, "path")?)?;
        if path.exists() {
            return Err(anyhow!("download target already exists"));
        }
        if let Some(parent) = path.parent() {
            tokio::fs::create_dir_all(parent).await?;
        }
        req["path"] =
            json!(std::fs::canonicalize(path.parent().unwrap())?.join(path.file_name().unwrap()));
    }
    if crate::browser_client::local_browser_enabled() && !ctx.browser.is_started().await && !matches!(op, "navigate" | "type") {
        if let Some(url) = ctx.last_browser_url_value() {
            let restored = ctx
                .browser
                .request(
                    &ctx.cwd,
                    ctx.runtime.profile_dir(),
                    json!({"op":"navigate","url":url}),
                )
                .await?;
            if restored["ok"] != true {
                return Ok(browser::response_to_tool_json(restored));
            }
        }
    }
    let mut handoff_answer = None;
    if op == "handoff" {
        required_text(args, "reason")?;
        let prep = ctx
            .browser
            .request(
                &ctx.cwd,
                ctx.runtime.profile_dir(),
                json!({"op":"handoff_prepare"}),
            )
            .await?;
        if prep["ok"] != true {
            return Ok(browser::response_to_tool_json(prep));
        }
        browser::update_last_url(&ctx.last_browser_url, &prep);
        *ctx.runtime.browser_url.lock().unwrap() = ctx.last_browser_url_value();
        let mut options = vec!["我已完成登入，請檢查頁面後繼續".to_string()];
        options.extend(recovery_options(
            args,
            &["登入仍有問題，先做不需要登入的部分"],
        )?);
        options.push("停止這份工作".into());
        let auto = std::env::var("GROKBOY_HANDOFF_AUTO").ok();
        let answer: Result<Value> = match auto.as_deref() {
            Some("1" | "true" | "resume" | "continue" | "yes") => Ok(json!({"answer":""})),
            Some("abort" | "0" | "false" | "no") => Ok(json!({"answer":"abort"})),
            _ => {
                let mut question = args.clone();
                question["kind"] = json!("handoff");
                question["handoff_options"] = json!(recovery_options(
                    args,
                    &["登入仍有問題，先做不需要登入的部分"]
                )?);
                question["question"] = json!(format!(
                    "{}\n請在 {} 操作；完成後回覆，將繼續使用同一份登入狀態。",
                    args["reason"].as_str().unwrap(),
                    if crate::browser_client::local_browser_enabled() { "本地工具瀏覽器".to_string() } else { BoxHub::viewer_url() }
                ));
                question["options"] = json!(options.clone());
                return ctx.runtime.park_question(&question);
            }
        };
        let answer = answer?;
        if matches!(
            answer["answer"].as_str(),
            Some("abort" | "cancel" | "no" | "停止這份工作")
        ) {
            return Ok(json!({"blocked":true,"handoff":"aborted","user_stopped":true}));
        }
        let selection = answer["answer"].as_str().unwrap_or("");
        if options.iter().skip(1).any(|option| option == selection) {
            return Ok(
                json!({"handoff":"deferred","status":"replan","answer":selection,"url":ctx.last_browser_url_value(),"instruction":"Keep this task and browser session. Follow the chosen alternative and update the plan; login has NOT been verified."}),
            );
        }
        handoff_answer = Some(selection.to_owned());
        req = json!({"op":"snapshot"});
    }
    let mut result = ctx
        .browser
        .request(&ctx.cwd, ctx.runtime.profile_dir(), req)
        .await?;
    result["surface"] = json!(if crate::browser_client::local_browser_enabled() { "local_browser" } else { "box_browser" });
    if !crate::browser_client::local_browser_enabled() {
        result["profile"] = json!("/home/box/chrome-profile");
        result["viewer_url"] = json!(BoxHub::viewer_url());
    }
    browser::update_last_url(&ctx.last_browser_url, &result);
    *ctx.runtime.browser_url.lock().unwrap() = ctx.last_browser_url_value();
    if op == "handoff" && result["ok"] == true {
        result["handoff"] = json!("resumed");
        result["answer"] = json!(handoff_answer);
        result["login_verified"] = json!(false);
        result["instruction"] = json!("Human replied; follow their actual answer (including requests to stop or change direction). Inspect this fresh snapshot to determine whether login actually succeeded; if still blocked, offer alternatives instead of repeating the same attempts.");
    }
    Ok(browser::response_to_tool_json(result))
}

#[cfg(test)]
mod tests {
    use super::*;

    fn temp_ctx() -> (ToolContext, PathBuf) {
        let stamp = uuid::Uuid::new_v4();
        let dir = std::env::temp_dir().join(format!("grokboy-tools-{stamp}"));
        std::fs::create_dir_all(&dir).unwrap();
        (ToolContext::new(dir.clone()), dir)
    }

    #[tokio::test]
    #[ignore = "requires the local Docker box; writes only a unique disposable fixture"]
    async fn default_shell_and_read_use_box_external_tools_use_local() {
        let (ctx, dir) = temp_ctx();
        let name = format!("surface-fixture-{}.txt", uuid::Uuid::new_v4());
        let remote = format!("/workspace/{name}");
        let result: Value = serde_json::from_str(&execute_tool(&ctx, "shell", &json!({
            "cmd":format!("sleep 2; printf box > {remote}"), "block_until_ms":1
        }).to_string()).await).unwrap();
        assert_eq!(result["running"], true, "{result}");
        assert_eq!(result["surface"], "box");
        assert!(!dir.join(&name).exists());
        let completed: Value = serde_json::from_str(&execute_tool(&ctx, "await_shell", &json!({"session_id":result["session_id"]}).to_string()).await).unwrap();
        assert_eq!(completed["exit_code"], 0, "{completed}");
        let read: Value = serde_json::from_str(&execute_tool(&ctx, "read", &json!({"path":remote}).to_string()).await).unwrap();
        assert_eq!(read["content"], "box");
        let local: Value = serde_json::from_str(&execute_tool(&ctx, "external_write_file", &json!({"path":name,"content":"local"}).to_string()).await).unwrap();
        assert!(local.get("error").is_none(), "{local}");
        assert_eq!(std::fs::read_to_string(dir.join(&name)).unwrap(), "local");
        let ambiguous: Value = serde_json::from_str(&execute_tool(&ctx, "write_file", &json!({"path":"unexpected.txt","content":"bad"}).to_string()).await).unwrap();
        assert!(ambiguous.get("error").is_some());
        assert!(!dir.join("unexpected.txt").exists());
        // A closed desktop browser must not block shell/read, and can be reopened.
        ctx.box_hub.ensure_browser_ready().await.unwrap();
        execute_tool(&ctx, "shell", &json!({"cmd":format!("rm -- {remote}")}).to_string()).await;
        std::fs::remove_dir_all(dir).unwrap();
    }

    #[tokio::test]
    async fn file_segments_search_and_unique_edits() {
        let (ctx, dir) = temp_ctx();
        std::fs::write(dir.join("notes.txt"), "alpha\nbeta\ngamma\n").unwrap();
        let read = execute_tool(
            &ctx,
            "external_read_file",
            &json!({"path":"notes.txt","offset":1,"limit":1}).to_string(),
        )
        .await;
        let read: Value = serde_json::from_str(&read).unwrap();
        assert_eq!(read["content"], "beta\n", "{read}");
        assert_eq!(read["next_offset"], 2);
        assert_eq!(read["truncated"], true);
        std::fs::create_dir_all(dir.join("node_modules")).unwrap();
        std::fs::write(dir.join("node_modules/noise.txt"), "beta").unwrap();
        let found: Value =
            serde_json::from_str(&execute_tool(&ctx, "external_search_files", r#"{"query":"beta"}"#).await)
                .unwrap();
        assert_eq!(found["matches"].as_array().unwrap().len(), 1);
        assert_eq!(found["matches"][0]["line"], 2);
        let edited: Value = serde_json::from_str(
            &execute_tool(
                &ctx,
                "external_edit_file",
                r#"{"path":"notes.txt","old_text":"beta","new_text":"BETA"}"#,
            )
            .await,
        )
        .unwrap();
        assert_eq!(edited["replacements"], 1);
        assert_eq!(
            std::fs::read_to_string(dir.join("notes.txt")).unwrap(),
            "alpha\nBETA\ngamma\n"
        );
        std::fs::write(dir.join("notes.txt"), "aaa").unwrap();
        let denied: Value = serde_json::from_str(
            &execute_tool(
                &ctx,
                "external_edit_file",
                r#"{"path":"notes.txt","old_text":"aa","new_text":"x"}"#,
            )
            .await,
        )
        .unwrap();
        assert!(denied.get("error").is_some());
        assert_eq!(
            std::fs::read_to_string(dir.join("notes.txt")).unwrap(),
            "aaa"
        );
        std::fs::remove_dir_all(dir).unwrap();
    }
    #[cfg(unix)]
    #[tokio::test]
    async fn file_tools_reject_symlink_escape() {
        let (ctx, dir) = temp_ctx();
        let outside =
            std::env::temp_dir().join(format!("grokboy-outside-{}", uuid::Uuid::new_v4()));
        std::fs::write(&outside, "private").unwrap();
        std::os::unix::fs::symlink(&outside, dir.join("link")).unwrap();
        for name in ["external_read_file", "external_write_file", "external_edit_file"] {
            let out: Value = serde_json::from_str(
                &execute_tool(
                    &ctx,
                    name,
                    &json!({"path":"link","content":"bad","old_text":"private","new_text":"bad"})
                        .to_string(),
                )
                .await,
            )
            .unwrap();
            assert!(out.get("error").is_some(), "{out}");
        }
        assert_eq!(std::fs::read_to_string(&outside).unwrap(), "private");
        std::fs::remove_file(outside).unwrap();
        std::fs::remove_dir_all(dir).unwrap();
    }

    #[tokio::test]
    async fn write_read_list_shell() {
        let (ctx, dir) = temp_ctx();

        let w = execute_tool(
            &ctx,
            "external_write_file",
            &json!({"path": "hello.txt", "content": "你好 GrokBoy"}).to_string(),
        )
        .await;
        let w: Value = serde_json::from_str(&w).unwrap();
        assert!(w.get("error").is_none(), "{w}");
        assert_eq!(w["bytes_written"], "你好 GrokBoy".len());

        let r = execute_tool(&ctx, "external_read_file", &json!({"path": "hello.txt"}).to_string()).await;
        let r: Value = serde_json::from_str(&r).unwrap();
        assert_eq!(r["content"], "你好 GrokBoy");

        let l = execute_tool(&ctx, "external_list_dir", &json!({"path": "."}).to_string()).await;
        let l: Value = serde_json::from_str(&l).unwrap();
        let names: Vec<&str> = l["entries"]
            .as_array()
            .unwrap()
            .iter()
            .map(|e| e["name"].as_str().unwrap())
            .collect();
        assert!(names.contains(&"hello.txt"));

        let s = execute_tool(
            &ctx,
            "external_shell",
            &json!({"command": "echo hi && ls hello.txt"}).to_string(),
        )
        .await;
        let s: Value = serde_json::from_str(&s).unwrap();
        assert_eq!(s["exit_code"], 0);
        assert!(s["stdout"].as_str().unwrap().contains("hi"));

        let _ = std::fs::remove_dir_all(&dir);
    }

    #[tokio::test]
    async fn rejects_path_traversal() {
        let (ctx, dir) = temp_ctx();
        let out = execute_tool(
            &ctx,
            "external_read_file",
            &json!({"path": "../outside.txt"}).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);
    }

    #[tokio::test]
    async fn report_done_and_blocked() {
        let (ctx, dir) = temp_ctx();
        let done = execute_tool(
            &ctx,
            "report_done",
            &json!({"message": "all good"}).to_string(),
        )
        .await;
        let done: Value = serde_json::from_str(&done).unwrap();
        assert_eq!(done["status"], "done");
        assert_eq!(done["message"], "all good");

        let blocked = execute_tool(
            &ctx,
            "report_blocked",
            &json!({"reason": "no access"}).to_string(),
        )
        .await;
        let blocked: Value = serde_json::from_str(&blocked).unwrap();
        assert_eq!(blocked["status"], "blocked");
        assert_eq!(blocked["reason"], "no access");

        assert!(is_completion_tool("report_done"));
        assert!(is_completion_tool("report_blocked"));
        assert!(!is_completion_tool("external_shell"));
        let _ = std::fs::remove_dir_all(&dir);
    }

    #[test]
    fn tool_defs_include_core_and_browser() {
        let defs = tool_definitions();
        let arr = defs.as_array().unwrap();
        assert_eq!(arr.len(), 51);
        let names: Vec<&str> = arr
            .iter()
            .map(|t| t["function"]["name"].as_str().unwrap())
            .collect();
        assert!(names.contains(&"external_shell"));
        assert!(names.contains(&"external_list_dir"));
        assert!(names.contains(&"external_read_file"));
        assert!(names.contains(&"external_write_file"));
        assert!(names.contains(&"send_message"));
        assert!(names.contains(&"external_grep"));
        assert!(names.contains(&"external_glob"));
        assert!(names.contains(&"web_fetch"));
        assert!(names.contains(&"web_search"));
        assert!(names.contains(&"external_await_command"));
        assert!(names.contains(&"spawn_subagent"));
        assert!(names.contains(&"check_subagent"));
        assert!(names.contains(&"message_subagent"));
        assert!(names.contains(&"stop_subagent"));
        assert!(names.contains(&"get_mcp_tools"));
        assert!(names.contains(&"call_mcp_tool"));
        assert!(names.contains(&"add_mcp_server"));
        assert!(names.contains(&"shell"));
        assert!(names.contains(&"read"));
        assert!(names.contains(&"await_shell"));
        assert!(!names.contains(&"exec_command"));
        assert!(!names.contains(&"read_file"));
        assert!(names.contains(&"copy_to_box"));
        assert!(names.contains(&"screenshot"));
        assert!(!names.contains(&"computer"));
        assert!(names.contains(&"request_box_help"));
        assert!(is_completion_tool("request_box_help"));
        assert!(names.contains(&"report_done"));
        assert!(names.contains(&"report_blocked"));
        assert!(names.contains(&"request_user_confirm"));
        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"));
        assert!(names.contains(&"browser_handoff"));
        let mut child = ToolContext::new(std::env::temp_dir());
        child.computer_use = true;
        let child_defs = tool_definitions_for(&child);
        let child_names: Vec<&str> = child_defs
            .as_array()
            .unwrap()
            .iter()
            .map(|t| t["function"]["name"].as_str().unwrap())
            .collect();
        assert!(child_names.contains(&"computer"));
        assert_eq!(child_names.len(), arr.len() + 1);
    }

    #[tokio::test]
    async fn parent_cannot_call_computer() {
        let (ctx, dir) = temp_ctx();
        let out = execute_tool(
            &ctx,
            "computer",
            &json!({"action":"click","x":10,"y":10}).to_string(),
        )
        .await;
        let v: Value = serde_json::from_str(&out).unwrap();
        let err = v["error"].as_str().unwrap_or(&out);
        assert!(err.contains("computerUse"), "{err}");
        assert!(err.contains("screenshot"), "{err}");
        let _ = std::fs::remove_dir_all(&dir);
    }

    #[tokio::test]
    async fn computer_use_child_rejects_click_outside_desktop_without_docker_if_unflagged() {
        // Bounds are enforced once the box reports geometry. Structural errors fail closed
        // before Docker: a half-specified click never reaches xdotool.
        let (mut ctx, dir) = temp_ctx();
        ctx.computer_use = true;
        let out = execute_tool(&ctx, "computer", &json!({"action":"click","x":10}).to_string()).await;
        let v: Value = serde_json::from_str(&out).unwrap();
        let err = v["error"].as_str().unwrap_or(&out);
        assert!(err.contains("both x and y"), "{err}");
        let _ = std::fs::remove_dir_all(&dir);
    }

    #[tokio::test]
    #[ignore = "requires the local Docker box; drives the shared desktop"]
    async fn computer_use_click_and_screenshot_on_box() {
        let (mut ctx, dir) = temp_ctx();
        ctx.computer_use = true;
        let out = execute_tool(
            &ctx,
            "computer",
            &json!({"action":"click","x":640,"y":360,"description":"desktop center"}).to_string(),
        )
        .await;
        let v: Value = serde_json::from_str(&out).unwrap();
        assert!(v.get("error").is_none(), "{v}");
        let path = std::path::PathBuf::from(v["path"].as_str().unwrap());
        assert!(path.is_file(), "{v}");
        assert!(std::fs::metadata(&path).unwrap().len() > 100);
        assert_eq!(v["screen"]["width"], 1280);
        let _ = std::fs::remove_dir_all(&dir);
    }

    #[tokio::test]
    async fn grep_glob_and_send_message() {
        let dir = std::env::temp_dir().join(format!("grokboy-grep-{}", uuid::Uuid::new_v4()));
        std::fs::create_dir_all(&dir).unwrap();
        std::fs::write(dir.join("a.rs"), "fn hello() {}\nfn world() {}\n").unwrap();
        std::fs::write(dir.join("b.txt"), "hello text\n").unwrap();
        let ctx = ToolContext::new(&dir);
        let globbed: Value = serde_json::from_str(
            &execute_tool(&ctx, "external_glob", &json!({"pattern":"*.rs"}).to_string()).await,
        )
        .unwrap();
        assert_eq!(globbed["matches"].as_array().unwrap().len(), 1);
        let grepped: Value = serde_json::from_str(
            &execute_tool(
                &ctx,
                "external_grep",
                &json!({"pattern":"fn \\w+","glob":"*.rs"}).to_string(),
            )
            .await,
        )
        .unwrap();
        assert_eq!(grepped["matches"].as_array().unwrap().len(), 2);
        let sent: Value = serde_json::from_str(
            &execute_tool(
                &ctx,
                "send_message",
                &json!({"type":"text","content":"hi there"}).to_string(),
            )
            .await,
        )
        .unwrap();
        assert_eq!(sent["sent"], true);
        assert_eq!(ctx.runtime.last_delivered().as_deref(), Some("hi there"));
        let _ = std::fs::remove_dir_all(dir);
    }

    #[tokio::test]
    async fn browser_handoff_auto_resume_protocol() {
        let _env_lock = crate::test_env::lock_async().await;
        let surface = std::env::var("GROKBOY_BROWSER_SURFACE").ok();
        std::env::set_var("GROKBOY_BROWSER_SURFACE", "local");
        // Offline: with GROKBOY_HANDOFF_AUTO=1, missing Chromium still fail-closes
        // OR (if Chromium present) resumes and returns snapshot/error JSON — never hangs.
        let prev = std::env::var("GROKBOY_HANDOFF_AUTO").ok();
        unsafe { std::env::set_var("GROKBOY_HANDOFF_AUTO", "1") };
        let root = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../..");
        let root = root.canonicalize().unwrap_or(root);
        let ctx = ToolContext::new(root);
        let out = execute_tool(
            &ctx,
            "browser_handoff",
            &json!({"reason": "unit test OTP wall", "timeout_secs": 5}).to_string(),
        )
        .await;
        let v: Value = serde_json::from_str(&out).unwrap();
        // Either resumed snapshot, or fail-closed blocked/error (no Chromium) — must not panic.
        let okish = v.get("handoff").and_then(|h| h.as_str()) == Some("resumed")
            || v.get("error").is_some()
            || v.get("blocked") == Some(&json!(true));
        assert!(okish, "unexpected handoff result: {v}");
        // missing reason fails closed
        let bad = execute_tool(&ctx, "browser_handoff", &json!({}).to_string()).await;
        let bad: Value = serde_json::from_str(&bad).unwrap();
        assert!(bad.get("error").is_some(), "{bad}");
        if let Some(value) = surface { std::env::set_var("GROKBOY_BROWSER_SURFACE", value); } else { std::env::remove_var("GROKBOY_BROWSER_SURFACE"); }
        match prev {
            Some(v) => unsafe { std::env::set_var("GROKBOY_HANDOFF_AUTO", v) },
            None => unsafe { std::env::remove_var("GROKBOY_HANDOFF_AUTO") },
        }
    }

    #[tokio::test]
    async fn request_user_confirm_auto_approve_and_deny() {
        let _env_lock = crate::test_env::lock_async().await;
        let prev_c = std::env::var("GROKBOY_CONFIRM_AUTO").ok();
        let prev_h = std::env::var("GROKBOY_HANDOFF_AUTO").ok();
        unsafe {
            std::env::remove_var("GROKBOY_HANDOFF_AUTO");
            std::env::set_var("GROKBOY_CONFIRM_AUTO", "1");
        }
        let (ctx, dir) = temp_ctx();
        let out = execute_tool(
            &ctx,
            "request_user_confirm",
            &json!({
                "reason": "publish example post",
                "prompt": "草稿內容",
                "timeout_secs": 2
            })
            .to_string(),
        )
        .await;
        let v: Value = serde_json::from_str(&out).unwrap();
        assert_eq!(v["status"], "approved");
        assert_eq!(v["approved"], true);

        unsafe { std::env::set_var("GROKBOY_CONFIRM_AUTO", "abort") };
        let out2 = execute_tool(
            &ctx,
            "request_user_confirm",
            &json!({"reason": "publish example post", "timeout_secs": 2}).to_string(),
        )
        .await;
        let v2: Value = serde_json::from_str(&out2).unwrap();
        assert_eq!(v2["status"], "denied");
        assert_eq!(v2["approved"], false);

        let bad = execute_tool(&ctx, "request_user_confirm", &json!({}).to_string()).await;
        let bad: Value = serde_json::from_str(&bad).unwrap();
        assert!(bad.get("error").is_some(), "{bad}");

        match prev_c {
            Some(v) => unsafe { std::env::set_var("GROKBOY_CONFIRM_AUTO", v) },
            None => unsafe { std::env::remove_var("GROKBOY_CONFIRM_AUTO") },
        }
        match prev_h {
            Some(v) => unsafe { std::env::set_var("GROKBOY_HANDOFF_AUTO", v) },
            None => unsafe { std::env::remove_var("GROKBOY_HANDOFF_AUTO") },
        }
        let _ = std::fs::remove_dir_all(&dir);
    }

    #[tokio::test]
    async fn browser_tool_fails_closed_without_chromium_ok_with_helper() {
        let _env_lock = crate::test_env::lock_async().await;
        let surface = std::env::var("GROKBOY_BROWSER_SURFACE").ok();
        std::env::set_var("GROKBOY_BROWSER_SURFACE", "local");
        // 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(),
            ..ctx
        };
        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}");
        if let Some(value) = surface { std::env::set_var("GROKBOY_BROWSER_SURFACE", value); } else { std::env::remove_var("GROKBOY_BROWSER_SURFACE"); }
        let _ = std::fs::remove_dir_all(&dir);
    }
}