lash-core 0.1.0-alpha.109

use std::sync::{Arc, Mutex};

use lash_sansio::llm::types::ProviderReplayMeta;
use serde::{Deserialize, Serialize};

use crate::plugin::{
    PluginError, SessionGraphService, SessionLifecycleService, SessionSnapshot, SessionStateService,
};
use crate::{ToolContract, ToolDefinition, ToolId, ToolManifest, ToolResult};

mod attachments;
mod direct_completion;
mod dispatch;
mod process;
pub(crate) mod process_events;
mod session;
mod triggers;

pub use attachments::ToolAttachmentClient;
pub use direct_completion::ToolDirectCompletionClient;
pub use dispatch::ToolDispatchClient;
pub use process::ToolSessionProcessAdmin;
pub use process_events::ToolProcessEventClient;
pub use session::{ToolSessionAdmin, ToolSessionModel};
pub use triggers::ToolTriggerClient;

/// A message sent from the sandbox to the host during execution.
#[derive(Clone, Debug)]
pub struct SandboxMessage {
    pub text: String,
    /// "tool_output" or another host-rendered progress event kind.
    pub kind: String,
}

/// Sender for streaming progress messages from tools (e.g. live bash output).
pub type ProgressSender = tokio::sync::mpsc::UnboundedSender<SandboxMessage>;

#[derive(Clone, Default)]
pub(crate) struct ToolCompletionState {
    key: Arc<Mutex<Option<crate::AwaitEventKey>>>,
}

impl ToolCompletionState {
    fn store(
        &self,
        key: crate::AwaitEventKey,
    ) -> Result<crate::AwaitEventKey, crate::RuntimeError> {
        let mut guard = self.key.lock().map_err(|_| {
            crate::RuntimeError::new(
                "tool_completion_state_poisoned",
                "tool completion key state lock poisoned",
            )
        })?;
        if let Some(existing) = guard.as_ref() {
            return Ok(existing.clone());
        }
        *guard = Some(key.clone());
        Ok(key)
    }

    pub(crate) fn take(&self) -> Result<Option<crate::AwaitEventKey>, crate::RuntimeError> {
        self.key.lock().map(|mut guard| guard.take()).map_err(|_| {
            crate::RuntimeError::new(
                "tool_completion_state_poisoned",
                "tool completion key state lock poisoned",
            )
        })
    }
}

/// Per-call environment for [`ToolProvider::execute`]. Fields are sealed so
/// the runtime can add capabilities without breaking tool authors.
#[derive(Clone)]
pub struct ToolContext<'run> {
    pub(crate) session_id: String,
    pub(crate) agent_frame_id: crate::AgentFrameId,
    pub(crate) sessions: Arc<dyn SessionStateService>,
    pub(crate) session_lifecycle: Arc<dyn SessionLifecycleService>,
    pub(crate) processes: Arc<dyn crate::ProcessService>,
    pub(crate) process_cancel_ability: Arc<dyn crate::ProcessCancelAbility>,
    pub(crate) effect_controller: crate::runtime::RuntimeEffectControllerHandle<'run>,
    pub(crate) runtime_dispatch: Option<Arc<crate::tool_dispatch::ToolDispatchContext<'run>>>,
    pub(crate) runtime_execution_context: Option<crate::RuntimeExecutionContext<'run>>,
    pub(crate) cancellation_token: Option<tokio_util::sync::CancellationToken>,
    pub(crate) async_process_id: Option<String>,
    pub(crate) runtime_process_id: Option<String>,
    pub(crate) process_events: Option<ToolProcessEventContext>,
    pub(crate) attachment_store: Arc<crate::SessionAttachmentStore>,
    pub(crate) direct_completions: crate::DirectCompletionClient<'run>,
    pub(crate) prepared_payload: serde_json::Value,
    pub(crate) tool_execution_binding: serde_json::Value,
    /// The id of the in-flight tool call that is invoking this tool.
    pub(crate) tool_call_id: Option<String>,
    pub(crate) attempt_number: u32,
    pub(crate) max_attempts: u32,
    pub(crate) replay_key: Option<String>,
    pub(crate) completion: ToolCompletionState,
    pub(crate) parent_invocation: Option<crate::RuntimeInvocation>,
    pub(crate) execution_env_spec: crate::ProcessExecutionEnvSpec,
    pub(crate) child_execution_trace_hook: Option<ToolChildExecutionTraceHook>,
}

#[derive(Clone)]
pub struct ToolChildProcessStarted {
    pub process_id: String,
    pub child_entry_name: Option<String>,
}

#[derive(Clone)]
pub struct ToolChildExecutionTraceHook {
    on_child_process_started: Arc<dyn Fn(ToolChildProcessStarted) + Send + Sync>,
}

impl ToolChildExecutionTraceHook {
    pub fn new(
        on_child_process_started: impl Fn(ToolChildProcessStarted) + Send + Sync + 'static,
    ) -> Self {
        Self {
            on_child_process_started: Arc::new(on_child_process_started),
        }
    }

    pub fn child_process_started(&self, event: ToolChildProcessStarted) {
        (self.on_child_process_started)(event);
    }
}

#[derive(Clone)]
pub(crate) struct ToolProcessEventContext {
    process_id: String,
    registry: Arc<dyn crate::ProcessRegistry>,
    awaiter: crate::ProcessAwaiter,
    store: Option<Arc<dyn crate::RuntimePersistence>>,
    session_store_factory: Option<Arc<dyn crate::SessionStoreFactory>>,
    session_graph: Arc<dyn SessionGraphService>,
    queued_work_driver: Option<crate::QueuedWorkDriver>,
}

pub(crate) struct ToolContextBuilder<'run> {
    session_id: String,
    agent_frame_id: crate::AgentFrameId,
    sessions: Arc<dyn SessionStateService>,
    session_lifecycle: Arc<dyn SessionLifecycleService>,
    session_graph: Arc<dyn SessionGraphService>,
    processes: Arc<dyn crate::ProcessService>,
    process_cancel_ability: Arc<dyn crate::ProcessCancelAbility>,
    effect_controller: crate::runtime::RuntimeEffectControllerHandle<'run>,
    runtime_dispatch: Option<Arc<crate::tool_dispatch::ToolDispatchContext<'run>>>,
    runtime_execution_context: Option<crate::RuntimeExecutionContext<'run>>,
    cancellation_token: Option<tokio_util::sync::CancellationToken>,
    async_process_id: Option<String>,
    runtime_process_id: Option<String>,
    process_events: Option<ToolProcessEventContext>,
    attachment_store: Arc<crate::SessionAttachmentStore>,
    direct_completions: crate::DirectCompletionClient<'run>,
    prepared_payload: serde_json::Value,
    tool_execution_binding: serde_json::Value,
    tool_call_id: Option<String>,
    completion: ToolCompletionState,
    parent_invocation: Option<crate::RuntimeInvocation>,
    execution_env_spec: crate::ProcessExecutionEnvSpec,
    child_execution_trace_hook: Option<ToolChildExecutionTraceHook>,
}

impl<'run> ToolContextBuilder<'run> {
    pub(crate) fn from_dispatch(
        dispatch: Arc<crate::tool_dispatch::ToolDispatchContext<'run>>,
    ) -> Self {
        Self {
            session_id: dispatch.session_id.clone(),
            agent_frame_id: dispatch.agent_frame_id.clone(),
            sessions: Arc::clone(&dispatch.sessions),
            session_lifecycle: Arc::clone(&dispatch.session_lifecycle),
            session_graph: Arc::clone(&dispatch.session_graph),
            processes: Arc::clone(&dispatch.processes),
            process_cancel_ability: Arc::clone(&dispatch.process_cancel_ability),
            effect_controller: dispatch.effect_controller.clone(),
            runtime_dispatch: Some(Arc::clone(&dispatch)),
            runtime_execution_context: None,
            cancellation_token: None,
            async_process_id: None,
            runtime_process_id: None,
            process_events: None,
            attachment_store: Arc::clone(&dispatch.attachment_store),
            direct_completions: dispatch.direct_completions.clone(),
            prepared_payload: serde_json::Value::Null,
            tool_execution_binding: serde_json::Value::Null,
            tool_call_id: None,
            completion: ToolCompletionState::default(),
            parent_invocation: dispatch.parent_invocation.clone(),
            execution_env_spec: dispatch.execution_env_spec.clone(),
            child_execution_trace_hook: None,
        }
    }

    #[cfg(any(test, feature = "testing"))]
    pub(crate) fn tool_call_id(mut self, tool_call_id: impl Into<Option<String>>) -> Self {
        self.tool_call_id = tool_call_id.into();
        self
    }

    pub(crate) fn prepared_call(mut self, call: &PreparedToolCall) -> Self {
        self.tool_call_id = Some(call.call_id.clone());
        self.prepared_payload = call.prepared_payload.clone();
        self
    }

    pub(crate) fn tool_execution_binding(mut self, binding: serde_json::Value) -> Self {
        self.tool_execution_binding = binding;
        self
    }

    pub(crate) fn cancellation_token(
        mut self,
        cancellation_token: Option<tokio_util::sync::CancellationToken>,
    ) -> Self {
        self.cancellation_token = cancellation_token;
        self
    }

    pub(crate) fn runtime_execution_context(
        mut self,
        context: crate::RuntimeExecutionContext<'run>,
    ) -> Self {
        self.runtime_execution_context = Some(context);
        self
    }

    pub(crate) fn runtime_process_id(mut self, process_id: Option<String>) -> Self {
        self.runtime_process_id = process_id;
        self
    }

    pub(crate) fn async_process(
        mut self,
        process_id: impl Into<String>,
        cancellation_token: tokio_util::sync::CancellationToken,
    ) -> Self {
        self.async_process_id = Some(process_id.into());
        self.cancellation_token = Some(cancellation_token);
        self
    }

    pub(crate) fn process_events(
        mut self,
        process_id: impl Into<String>,
        registry: Arc<dyn crate::ProcessRegistry>,
        awaiter: crate::ProcessAwaiter,
        store: Option<Arc<dyn crate::RuntimePersistence>>,
        session_store_factory: Option<Arc<dyn crate::SessionStoreFactory>>,
        queued_work_driver: Option<crate::QueuedWorkDriver>,
    ) -> Self {
        self.process_events = Some(ToolProcessEventContext {
            process_id: process_id.into(),
            registry,
            awaiter,
            store,
            session_store_factory,
            session_graph: Arc::clone(&self.session_graph),
            queued_work_driver,
        });
        self
    }

    pub(crate) fn parent_invocation(mut self, metadata: Option<crate::RuntimeInvocation>) -> Self {
        self.parent_invocation = metadata;
        self
    }

    pub(crate) fn child_execution_trace_hook(
        mut self,
        hook: Option<ToolChildExecutionTraceHook>,
    ) -> Self {
        self.child_execution_trace_hook = hook;
        self
    }

    pub(crate) fn build(self) -> ToolContext<'run> {
        ToolContext {
            session_id: self.session_id,
            agent_frame_id: self.agent_frame_id,
            sessions: self.sessions,
            session_lifecycle: self.session_lifecycle,
            processes: self.processes,
            process_cancel_ability: self.process_cancel_ability,
            effect_controller: self.effect_controller,
            runtime_dispatch: self.runtime_dispatch,
            runtime_execution_context: self.runtime_execution_context,
            cancellation_token: self.cancellation_token,
            async_process_id: self.async_process_id,
            runtime_process_id: self.runtime_process_id,
            process_events: self.process_events,
            attachment_store: self.attachment_store,
            direct_completions: self.direct_completions,
            prepared_payload: self.prepared_payload,
            tool_execution_binding: self.tool_execution_binding,
            tool_call_id: self.tool_call_id,
            attempt_number: 1,
            max_attempts: 1,
            replay_key: None,
            completion: self.completion,
            parent_invocation: self.parent_invocation,
            execution_env_spec: self.execution_env_spec,
            child_execution_trace_hook: self.child_execution_trace_hook,
        }
    }
}

impl<'run> ToolContext<'run> {
    #[cfg(any(test, feature = "testing"))]
    #[expect(
        clippy::too_many_arguments,
        reason = "testing constructor mirrors the sealed runtime tool context dependencies"
    )]
    pub(crate) fn builder(
        session_id: String,
        sessions: Arc<dyn SessionStateService>,
        session_lifecycle: Arc<dyn SessionLifecycleService>,
        session_graph: Arc<dyn SessionGraphService>,
        processes: Arc<dyn crate::ProcessService>,
        process_cancel_ability: Arc<dyn crate::ProcessCancelAbility>,
        effect_controller: crate::runtime::RuntimeEffectControllerHandle<'run>,
        attachment_store: Arc<crate::SessionAttachmentStore>,
        direct_completions: crate::DirectCompletionClient<'run>,
    ) -> ToolContextBuilder<'run> {
        ToolContextBuilder {
            session_id,
            agent_frame_id: String::new(),
            sessions,
            session_lifecycle,
            session_graph,
            processes,
            process_cancel_ability,
            effect_controller,
            runtime_dispatch: None,
            runtime_execution_context: None,
            cancellation_token: None,
            async_process_id: None,
            runtime_process_id: None,
            process_events: None,
            attachment_store,
            direct_completions,
            prepared_payload: serde_json::Value::Null,
            tool_execution_binding: serde_json::Value::Null,
            tool_call_id: None,
            completion: ToolCompletionState::default(),
            parent_invocation: None,
            execution_env_spec: crate::ProcessExecutionEnvSpec::new(
                crate::PluginOptions::default(),
                crate::SessionPolicy::default(),
            ),
            child_execution_trace_hook: None,
        }
    }

    pub(crate) fn from_dispatch(
        dispatch: Arc<crate::tool_dispatch::ToolDispatchContext<'run>>,
    ) -> ToolContextBuilder<'run> {
        ToolContextBuilder::from_dispatch(dispatch)
    }

    pub fn session_id(&self) -> &str {
        &self.session_id
    }

    pub fn agent_frame_id(&self) -> &str {
        &self.agent_frame_id
    }

    pub fn sessions(&self) -> ToolSessionAdmin<'run> {
        ToolSessionAdmin {
            session_id: self.session_id.clone(),
            sessions: Arc::clone(&self.sessions),
            session_lifecycle: Arc::clone(&self.session_lifecycle),
            effect_controller: self.effect_controller.clone(),
        }
    }

    pub fn dispatch(&self) -> ToolDispatchClient<'run> {
        ToolDispatchClient {
            context: self.clone(),
        }
    }

    pub fn triggers(&self) -> ToolTriggerClient<'run> {
        ToolTriggerClient {
            context: self.clone(),
        }
    }

    pub fn processes(&self) -> ToolSessionProcessAdmin<'run> {
        ToolSessionProcessAdmin {
            session_id: self.session_id.clone(),
            agent_frame_id: self.agent_frame_id.clone(),
            processes: Arc::clone(&self.processes),
            process_cancel_ability: Arc::clone(&self.process_cancel_ability),
            effect_controller: self.effect_controller.clone(),
            parent_invocation: self.parent_invocation.clone(),
            tool_call_id: self.tool_call_id.clone(),
            execution_env_spec: self.execution_env_spec.clone(),
        }
    }

    pub fn emit_child_process_started(
        &self,
        process_id: impl Into<String>,
        child_entry_name: Option<String>,
    ) {
        let Some(hook) = &self.child_execution_trace_hook else {
            return;
        };
        hook.child_process_started(ToolChildProcessStarted {
            process_id: process_id.into(),
            child_entry_name,
        });
    }

    pub fn direct_completions(&self) -> ToolDirectCompletionClient<'run> {
        ToolDirectCompletionClient {
            session_id: self.session_id.clone(),
            tool_call_id: self.tool_call_id.clone(),
            direct_completions: self.direct_completions.clone(),
            parent_invocation: self.parent_invocation.clone(),
        }
    }

    pub fn attachments(&self) -> ToolAttachmentClient {
        ToolAttachmentClient {
            store: Arc::clone(&self.attachment_store),
        }
    }

    pub fn process_events(&self) -> ToolProcessEventClient {
        ToolProcessEventClient {
            context: self.process_events.clone(),
        }
    }

    pub fn cancellation_token(&self) -> Option<&tokio_util::sync::CancellationToken> {
        self.cancellation_token.as_ref()
    }

    #[doc(hidden)]
    pub fn named_phase(&self, phase: &'static str) -> crate::runtime::RuntimeNamedPhase {
        match self.runtime_execution_context.as_ref() {
            Some(context) => context.named_phase(phase),
            None => crate::runtime::RuntimeNamedPhase::begin(None, phase),
        }
    }

    pub fn async_process_id(&self) -> Option<&str> {
        self.async_process_id.as_deref()
    }

    pub fn runtime_process_id(&self) -> Option<&str> {
        self.async_process_id
            .as_deref()
            .or(self.runtime_process_id.as_deref())
            .or_else(|| {
                self.process_events
                    .as_ref()
                    .map(|context| context.process_id.as_str())
            })
    }

    pub fn tool_call_id(&self) -> Option<&str> {
        self.tool_call_id.as_deref()
    }

    pub fn prepared_payload(&self) -> &serde_json::Value {
        &self.prepared_payload
    }

    pub fn tool_execution_binding(&self) -> &serde_json::Value {
        &self.tool_execution_binding
    }

    pub fn decode_prepared_payload<T>(&self) -> Result<T, serde_json::Error>
    where
        T: serde::de::DeserializeOwned,
    {
        serde_json::from_value(self.prepared_payload.clone())
    }

    pub fn attempt_number(&self) -> u32 {
        self.attempt_number
    }

    pub fn max_attempts(&self) -> u32 {
        self.max_attempts
    }

    pub fn replay_key(&self) -> Option<&str> {
        self.replay_key.as_deref()
    }

    /// Obtain the durable completion key for this call, required before returning
    /// [`ToolResult::Pending`](crate::ToolResult::Pending).
    ///
    /// A tool that defers its outcome (waiting on a webhook, human approval, or another
    /// service) calls this, hands the returned [`AwaitEventKey`](crate::AwaitEventKey)
    /// to whatever will complete the work out-of-band, and then returns
    /// `ToolResult::Pending(..)`. The key names the durable wait the runtime parks the
    /// call on; the external resolver delivers the result against it later.
    ///
    /// The key is stored on the context and consumed by the dispatcher when the tool
    /// returns `Pending`. Returning `Pending` without first calling this fails the call
    /// with `pending_tool_missing_completion_key`. Calls made outside a prepared tool
    /// invocation (no tool call id) fail with `tool_completion_key_missing_call_id`.
    pub async fn completion_key(&self) -> Result<crate::AwaitEventKey, crate::RuntimeError> {
        let tool_call_id = self.tool_call_id.clone().ok_or_else(|| {
            crate::RuntimeError::new(
                "tool_completion_key_missing_call_id",
                "completion keys require a prepared tool call id",
            )
        })?;
        let scoped = self.effect_controller.scoped();
        let key = scoped
            .controller()
            .await_event_key(
                scoped.execution_scope(),
                crate::AwaitEventWaitIdentity::tool_completion(tool_call_id),
            )
            .await?;
        self.completion.store(key)
    }

    pub(crate) fn take_completion_key(
        &self,
    ) -> Result<Option<crate::AwaitEventKey>, crate::RuntimeError> {
        self.completion.take()
    }

    pub fn with_async_process(
        mut self,
        process_id: impl Into<String>,
        cancellation_token: tokio_util::sync::CancellationToken,
    ) -> Self {
        self.async_process_id = Some(process_id.into());
        self.runtime_process_id = self.async_process_id.clone();
        self.cancellation_token = Some(cancellation_token);
        self
    }

    #[cfg(any(test, feature = "testing"))]
    #[doc(hidden)]
    pub fn with_process_events_for_testing(
        mut self,
        process_id: impl Into<String>,
        registry: Arc<dyn crate::ProcessRegistry>,
    ) -> Self {
        let awaiter = crate::ProcessAwaiter::polling(Arc::clone(&registry));
        self.process_events = Some(ToolProcessEventContext {
            process_id: process_id.into(),
            registry,
            awaiter,
            store: None,
            session_store_factory: None,
            session_graph: Arc::new(crate::plugin::NoopSessionManager),
            queued_work_driver: None,
        });
        self
    }

    pub(crate) fn with_retry_context(
        mut self,
        tool_name: &str,
        attempt_number: u32,
        max_attempts: u32,
    ) -> Self {
        self.attempt_number = attempt_number.max(1);
        self.max_attempts = max_attempts.max(1);
        self.replay_key = self
            .tool_call_id
            .as_ref()
            .map(|call_id| format!("lash-tool:{}:{call_id}:{tool_name}", self.session_id));
        self
    }

    pub(crate) fn with_prepared_payload(mut self, payload: serde_json::Value) -> Self {
        self.prepared_payload = payload;
        self
    }

    pub(crate) fn with_tool_execution_binding(mut self, binding: serde_json::Value) -> Self {
        self.tool_execution_binding = binding;
        self
    }

    /// Constructor reserved for `lash_core::testing` helpers. Do not call directly;
    /// use [`lash_core::testing::mock_tool_context`] instead.
    #[cfg(any(test, feature = "testing"))]
    #[doc(hidden)]
    #[expect(
        clippy::too_many_arguments,
        reason = "test-only constructor mirrors the sealed runtime tool context"
    )]
    pub fn __for_testing(
        session_id: String,
        sessions: Arc<dyn SessionStateService>,
        session_lifecycle: Arc<dyn SessionLifecycleService>,
        session_graph: Arc<dyn SessionGraphService>,
        processes: Arc<dyn crate::ProcessService>,
        attachment_store: Arc<crate::SessionAttachmentStore>,
        direct_completions: crate::DirectCompletionClient<'static>,
        tool_call_id: Option<String>,
    ) -> ToolContext<'static> {
        ToolContext::builder(
            session_id,
            sessions,
            session_lifecycle,
            session_graph,
            processes,
            Arc::new(crate::DefaultProcessCancelAbility),
            crate::runtime::RuntimeEffectControllerHandle::shared(Arc::new(
                crate::InlineRuntimeEffectController,
            )),
            attachment_store,
            direct_completions,
        )
        .tool_call_id(tool_call_id)
        .build()
    }

    /// Constructor reserved for tests that need a custom process-cancel host
    /// ability. Do not call directly; prefer public testing helpers when they
    /// cover the case.
    #[cfg(any(test, feature = "testing"))]
    #[doc(hidden)]
    #[expect(
        clippy::too_many_arguments,
        reason = "test-only constructor mirrors the sealed runtime context"
    )]
    pub fn __for_testing_with_process_cancel_ability(
        session_id: String,
        sessions: Arc<dyn SessionStateService>,
        session_lifecycle: Arc<dyn SessionLifecycleService>,
        session_graph: Arc<dyn SessionGraphService>,
        processes: Arc<dyn crate::ProcessService>,
        process_cancel_ability: Arc<dyn crate::ProcessCancelAbility>,
        attachment_store: Arc<crate::SessionAttachmentStore>,
        direct_completions: crate::DirectCompletionClient<'static>,
        tool_call_id: Option<String>,
    ) -> ToolContext<'static> {
        ToolContext::builder(
            session_id,
            sessions,
            session_lifecycle,
            session_graph,
            processes,
            process_cancel_ability,
            crate::runtime::RuntimeEffectControllerHandle::shared(Arc::new(
                crate::InlineRuntimeEffectController,
            )),
            attachment_store,
            direct_completions,
        )
        .tool_call_id(tool_call_id)
        .build()
    }
}

/// Runtime-prepared executable tool call.
///
/// The raw model/provider identity remains visible, but any argument rewrites
/// and provider-owned context projections are frozen before the call crosses a
/// runtime effect or process boundary.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct PreparedToolCall {
    pub call_id: String,
    pub tool_id: ToolId,
    pub tool_name: String,
    pub args: serde_json::Value,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub replay: Option<ProviderReplayMeta>,
    #[serde(default, skip_serializing_if = "serde_json::Value::is_null")]
    pub prepared_payload: serde_json::Value,
}

impl PreparedToolCall {
    pub fn identity(tool_id: ToolId, call: crate::sansio::PendingToolCall) -> Self {
        Self {
            call_id: call.call_id,
            tool_id,
            tool_name: call.tool_name,
            args: call.args,
            replay: call.replay,
            prepared_payload: serde_json::Value::Null,
        }
    }

    pub fn from_parts(
        call_id: impl Into<String>,
        tool_id: impl Into<ToolId>,
        tool_name: impl Into<String>,
        args: serde_json::Value,
        replay: Option<ProviderReplayMeta>,
        prepared_payload: serde_json::Value,
    ) -> Self {
        Self {
            call_id: call_id.into(),
            tool_id: tool_id.into(),
            tool_name: tool_name.into(),
            args,
            replay,
            prepared_payload,
        }
    }
}

/// One ordered child inside a runtime-prepared tool batch.
///
/// The call itself carries the executable provider payload. `replay_suffix`
/// is the deterministic suffix used for child effects such as retry sleeps or
/// pending completion awaits when the batch is the durable parent.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct PreparedToolBatchCall {
    pub call: PreparedToolCall,
    pub replay_suffix: String,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub execution_grant: Option<Box<ToolExecutionGrant>>,
}

/// Runtime-prepared executable tool batch.
///
/// The vector order is source order. Scheduling may run parallel-safe tools
/// concurrently, but launches and pending completion consumption are projected
/// back through this order.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct PreparedToolBatch {
    pub batch_id: String,
    pub calls: Vec<PreparedToolBatchCall>,
}

impl PreparedToolBatch {
    pub fn new(batch_id: impl Into<String>, calls: Vec<PreparedToolCall>) -> Self {
        let batch_id = batch_id.into();
        let calls = calls
            .into_iter()
            .enumerate()
            .map(|(index, call)| PreparedToolBatchCall {
                replay_suffix: format!("child:{index}:{}", call.call_id),
                call,
                execution_grant: None,
            })
            .collect();
        Self { batch_id, calls }
    }

    pub fn new_with_grants(
        batch_id: impl Into<String>,
        calls: Vec<(PreparedToolCall, Option<ToolExecutionGrant>)>,
    ) -> Self {
        let batch_id = batch_id.into();
        let calls = calls
            .into_iter()
            .enumerate()
            .map(|(index, (call, execution_grant))| PreparedToolBatchCall {
                replay_suffix: format!("child:{index}:{}", call.call_id),
                call,
                execution_grant: execution_grant.map(Box::new),
            })
            .collect();
        Self { batch_id, calls }
    }

    pub fn is_empty(&self) -> bool {
        self.calls.is_empty()
    }

    pub fn len(&self) -> usize {
        self.calls.len()
    }
}

/// Explicit authority to execute a tool outside Tool Catalog membership.
///
/// Normal tool calls are authorized by catalog membership. A grant is a
/// separate, caller-provided capability used by deferred resolution flows: it
/// carries the manifest/contract to validate the call plus an opaque host
/// execution binding that providers can inspect from the prepare and execute
/// contexts.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct ToolExecutionGrant {
    /// Tool identity and model-facing metadata authorized by the grant.
    pub manifest: ToolManifest,
    /// Contract used to validate granted call arguments without consulting the
    /// current Tool Catalog.
    pub contract: Box<ToolContract>,
    /// Explicit registry source route for registry-backed execution. Direct
    /// non-registry providers may ignore this; [`ToolRegistry`] requires it.
    pub source_id: Option<String>,
    /// Opaque host routing payload passed to prepare and execute contexts.
    pub execution_binding: serde_json::Value,
}

impl ToolExecutionGrant {
    pub fn new(manifest: ToolManifest, contract: ToolContract) -> Self {
        Self {
            manifest,
            contract: Box::new(contract),
            source_id: None,
            execution_binding: serde_json::Value::Null,
        }
    }

    pub fn from_definition(definition: ToolDefinition) -> Self {
        Self::new(definition.manifest(), definition.contract())
    }

    pub fn with_source_id(mut self, source_id: impl Into<String>) -> Self {
        self.source_id = Some(source_id.into());
        self
    }

    pub fn with_execution_binding(mut self, execution_binding: serde_json::Value) -> Self {
        self.execution_binding = execution_binding;
        self
    }
}

#[derive(Clone)]
pub struct ToolPrepareContext {
    session_id: String,
    sessions: Arc<dyn SessionStateService>,
    turn_context: crate::TurnContext,
    tool_call_id: Option<String>,
    tool_execution_binding: serde_json::Value,
}

impl ToolPrepareContext {
    pub(crate) fn with_execution_binding(
        session_id: String,
        sessions: Arc<dyn SessionStateService>,
        turn_context: crate::TurnContext,
        tool_call_id: Option<String>,
        tool_execution_binding: serde_json::Value,
    ) -> Self {
        Self {
            session_id,
            sessions,
            turn_context,
            tool_call_id,
            tool_execution_binding,
        }
    }

    pub fn session_id(&self) -> &str {
        &self.session_id
    }

    pub fn tool_call_id(&self) -> Option<&str> {
        self.tool_call_id.as_deref()
    }

    pub fn tool_execution_binding(&self) -> &serde_json::Value {
        &self.tool_execution_binding
    }

    pub fn turn_context(&self) -> &crate::TurnContext {
        &self.turn_context
    }

    pub fn plugin_input<T>(&self, plugin_id: &'static str) -> Option<&T>
    where
        T: 'static,
    {
        self.turn_context.plugin_input::<T>(plugin_id)
    }

    pub async fn session_snapshot(&self) -> Result<SessionSnapshot, PluginError> {
        self.sessions.snapshot_session(&self.session_id).await
    }

    pub async fn tool_catalog(&self) -> Result<Vec<serde_json::Value>, PluginError> {
        self.sessions.tool_catalog(&self.session_id).await
    }

    pub async fn shared_tool_catalog(
        &self,
    ) -> Result<std::sync::Arc<Vec<serde_json::Value>>, PluginError> {
        self.sessions.shared_tool_catalog(&self.session_id).await
    }
}

/// Inputs handed to [`ToolProvider::prepare_tool_call`].
pub struct ToolPrepareCall<'a> {
    pub tool_id: ToolId,
    pub pending: crate::sansio::PendingToolCall,
    pub context: &'a ToolPrepareContext,
}

/// Per-call inputs handed to [`ToolProvider::execute`].
///
/// Fields are `pub` because `ToolCall` is a transient borrow; consumers
/// typically destructure (`let ToolCall { name, args, .. } = call`). The
/// stable surface lives on [`ToolContext`] (sealed) and the runtime's
/// dispatcher, which constructs `ToolCall` values.
pub struct ToolCall<'a> {
    pub name: &'a str,
    pub args: &'a serde_json::Value,
    pub context: &'a ToolContext<'a>,
    pub progress: Option<&'a ProgressSender>,
}

/// Trait for providing tools to the sandbox. Implement this per-project.
///
/// Implementations supply cheap [`ToolManifest`]s, lazily resolved
/// [`ToolContract`]s, and a single
/// [`execute`](Self::execute) method that handles every call. Tools that
/// need session state read it from `call.context`; tools that stream
/// progress send through `call.progress`.
#[async_trait::async_trait]
pub trait ToolProvider: Send + Sync + 'static {
    fn tool_manifests(&self) -> Vec<ToolManifest>;
    fn resolve_manifest(&self, name: &str) -> Option<ToolManifest> {
        self.tool_manifests()
            .into_iter()
            .find(|manifest| manifest.name == name)
    }
    fn resolve_manifest_by_id(&self, id: &ToolId) -> Option<ToolManifest> {
        self.tool_manifests()
            .into_iter()
            .find(|manifest| manifest.id == *id)
    }
    fn resolve_contract(&self, name: &str) -> Option<Arc<ToolContract>>;
    fn resolve_contract_by_id(&self, id: &ToolId) -> Option<Arc<ToolContract>> {
        let manifest = self.resolve_manifest_by_id(id)?;
        self.resolve_contract(&manifest.name)
    }
    async fn prepare_tool_call(
        &self,
        call: ToolPrepareCall<'_>,
    ) -> Result<PreparedToolCall, ToolResult> {
        Ok(PreparedToolCall::identity(call.tool_id, call.pending))
    }
    async fn prepare_granted_tool_call(
        &self,
        grant: &ToolExecutionGrant,
        call: ToolPrepareCall<'_>,
    ) -> Result<PreparedToolCall, ToolResult> {
        let _ = call;
        Err(ToolResult::err_fmt(format_args!(
            "Granted execution is unsupported for tool id `{}`",
            grant.manifest.id
        )))
    }
    async fn execute(&self, call: ToolCall<'_>) -> ToolResult;
    async fn execute_granted(
        &self,
        grant: &ToolExecutionGrant,
        args: &serde_json::Value,
        context: &ToolContext<'_>,
        progress: Option<&ProgressSender>,
    ) -> ToolResult {
        let _ = (args, context, progress);
        ToolResult::err_fmt(format_args!(
            "Granted execution is unsupported for tool id `{}`",
            grant.manifest.id
        ))
    }
    async fn execute_by_id(
        &self,
        tool_id: &ToolId,
        args: &serde_json::Value,
        context: &ToolContext<'_>,
        progress: Option<&ProgressSender>,
    ) -> ToolResult {
        let Some(manifest) = self.resolve_manifest_by_id(tool_id) else {
            return ToolResult::err_fmt(format!("Unknown tool id: {tool_id}"));
        };
        self.execute(ToolCall {
            name: &manifest.name,
            args,
            context,
            progress,
        })
        .await
    }
}

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

    #[test]
    fn tool_context_builder_carries_call_payload_and_cancellation_state() {
        let cancellation = tokio_util::sync::CancellationToken::new();
        let prepared = PreparedToolCall::from_parts(
            "call-1",
            "tool:demo_tool",
            "demo_tool",
            serde_json::json!({ "input": true }),
            None,
            serde_json::json!({ "prepared": true }),
        );

        let context = ToolContext::builder(
            "session-1".to_string(),
            Arc::new(crate::testing::MockSessionManager::default()),
            Arc::new(crate::testing::MockSessionManager::default()),
            Arc::new(crate::testing::MockSessionManager::default()),
            Arc::new(crate::UnavailableProcessService),
            Arc::new(crate::DefaultProcessCancelAbility),
            crate::runtime::RuntimeEffectControllerHandle::shared(Arc::new(
                crate::InlineRuntimeEffectController,
            )),
            Arc::new(crate::SessionAttachmentStore::in_memory()),
            crate::DirectCompletionClient::unavailable(
                "direct completions are unavailable in this test context",
            ),
        )
        .prepared_call(&prepared)
        .cancellation_token(Some(cancellation.clone()))
        .async_process("process-1", cancellation.clone())
        .build();

        assert_eq!(context.session_id(), "session-1");
        assert_eq!(context.tool_call_id(), Some("call-1"));
        assert_eq!(
            context.prepared_payload(),
            &serde_json::json!({ "prepared": true })
        );
        assert_eq!(context.async_process_id(), Some("process-1"));
        assert!(context.cancellation_token().is_some());
    }
}