meerkat-core 0.7.3

Core agent logic for Meerkat (no I/O deps)
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

//! Hook integration helpers for agent lifecycle and loop points.

use crate::agent::{Agent, AgentLlmClient, AgentSessionStore, AgentToolDispatcher};
use crate::error::AgentError;
use crate::event::AgentEvent;
use crate::hooks::{
    HookDecision, HookEngineError, HookExecutionReport, HookFailureReason, HookInvocation,
};
#[cfg(target_arch = "wasm32")]
use crate::tokio;
use tokio::sync::mpsc;

impl<C, T, S> Agent<C, T, S>
where
    C: AgentLlmClient + ?Sized + 'static,
    T: AgentToolDispatcher + ?Sized + 'static,
    S: AgentSessionStore + ?Sized + 'static,
{
    pub(super) async fn execute_hooks(
        &self,
        invocation: HookInvocation,
        event_tx: Option<&mpsc::Sender<AgentEvent>>,
    ) -> Result<HookExecutionReport, AgentError> {
        let Some(hook_engine) = &self.hook_engine else {
            return Ok(HookExecutionReport::empty());
        };

        {
            let planned = hook_engine
                .matching_hooks(&invocation, Some(&self.hook_run_overrides))
                .map_err(Self::map_hook_engine_error)?;
            for hook_id in planned {
                crate::event_tap::tap_emit(
                    &self.event_tap,
                    event_tx,
                    AgentEvent::HookStarted {
                        hook_id,
                        point: invocation.point,
                    },
                )
                .await;
            }
        }

        let report = match hook_engine
            .execute(invocation.clone(), Some(&self.hook_run_overrides))
            .await
        {
            Ok(report) => report,
            Err(err) => {
                self.emit_hook_engine_error(&invocation, event_tx, &err)
                    .await;
                return Err(Self::map_hook_engine_error(err));
            }
        };

        for outcome in &report.outcomes {
            if let Some(reason) = &outcome.failure_reason {
                crate::event_tap::tap_emit(
                    &self.event_tap,
                    event_tx,
                    AgentEvent::HookFailed {
                        hook_id: outcome.hook_id.clone(),
                        point: outcome.point,
                        reason: reason.clone(),
                    },
                )
                .await;
            } else {
                crate::event_tap::tap_emit(
                    &self.event_tap,
                    event_tx,
                    AgentEvent::HookCompleted {
                        hook_id: outcome.hook_id.clone(),
                        point: outcome.point,
                        duration_ms: outcome.duration_ms.unwrap_or(0),
                    },
                )
                .await;
            }
        }

        if let Some(HookDecision::Deny {
            hook_id,
            reason_code,
            message,
            payload,
        }) = &report.decision
        {
            crate::event_tap::tap_emit(
                &self.event_tap,
                event_tx,
                AgentEvent::HookDenied {
                    hook_id: hook_id.clone(),
                    point: invocation.point,
                    reason_code: *reason_code,
                    message: message.clone(),
                    payload: payload.clone(),
                },
            )
            .await;
        }

        Ok(report)
    }

    fn map_hook_engine_error(err: HookEngineError) -> AgentError {
        err.into_agent_error()
    }

    async fn emit_hook_engine_error(
        &self,
        invocation: &HookInvocation,
        event_tx: Option<&mpsc::Sender<AgentEvent>>,
        err: &HookEngineError,
    ) {
        if let Some(hook_id) = err.hook_id() {
            crate::event_tap::tap_emit(
                &self.event_tap,
                event_tx,
                AgentEvent::HookFailed {
                    hook_id: hook_id.clone(),
                    point: invocation.point,
                    reason: HookFailureReason::from_engine_error(err),
                },
            )
            .await;
        }
    }
}