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Add Agentics execution span instrumentation as Foundational Execution Unit
Instrument the sentinel repository to emit hierarchical execution spans (Core -> Repo -> Agent) with enforcement that no agent may execute without a span and no request may proceed without a parent_span_id from the Core. - Add execution module to sentinel-core with span types, graph builder, and validation - Add execution context middleware to sentinel-api that extracts X-Parent-Span-Id header and rejects requests without it - Instrument all 5 agent POST handlers (anomaly, drift, alerting, correlation, rca) with agent-level spans, evidence, and artifacts - Return InstrumentedResponse with full execution graph on all agent endpoints - Apply middleware only to POST routes; GET endpoints (config/stats) remain unauthenticated Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
1 parent 5ddd740 commit 446173b

10 files changed

Lines changed: 771 additions & 65 deletions

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‎crates/sentinel-api/src/execution.rs‎

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//! Execution context middleware and extractors for Agentics integration.
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//!
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//! This module enforces the Foundational Execution Unit contract:
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//! - Every request MUST provide `X-Execution-Id` and `X-Parent-Span-Id` headers.
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//! - Requests missing `X-Parent-Span-Id` are rejected with 400 Bad Request.
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//! - A repo-level span is created on entry and threaded through the request.
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//! - Handlers create agent-level spans via the `ExecutionGraphCollector`.
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use axum::{
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body::Body,
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extract::FromRequestParts,
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http::{header::HeaderName, request::Parts, Request, StatusCode},
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middleware::Next,
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response::{IntoResponse, Response},
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Json,
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};
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use llm_sentinel_core::execution::{ExecutionContext, ExecutionGraphCollector};
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use tracing::{error, info};
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use uuid::Uuid;
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/// Header name for the execution ID.
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pub static HEADER_EXECUTION_ID: HeaderName = HeaderName::from_static("x-execution-id");
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/// Header name for the parent span ID (from the Core).
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pub static HEADER_PARENT_SPAN_ID: HeaderName = HeaderName::from_static("x-parent-span-id");
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/// Axum middleware that extracts execution context from request headers,
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/// creates a repo-level span, and injects the `ExecutionGraphCollector`
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/// into request extensions.
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///
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/// # Enforcement
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/// - Rejects requests missing `X-Parent-Span-Id` with 400 Bad Request.
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/// - This repo MUST NEVER execute silently.
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pub async fn execution_context_middleware(
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req: Request<Body>,
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next: Next,
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) -> Result<Response, Response> {
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// Extract parent_span_id (MANDATORY)
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let parent_span_id = req
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.headers()
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.get(&HEADER_PARENT_SPAN_ID)
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.and_then(|v| v.to_str().ok())
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.and_then(|s| Uuid::parse_str(s).ok());
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let parent_span_id = match parent_span_id {
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Some(id) => id,
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None => {
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error!("Missing or invalid X-Parent-Span-Id header: execution rejected");
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let body = serde_json::json!({
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"error": "EXECUTION_CONTEXT_REQUIRED",
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"message": "X-Parent-Span-Id header is required. This repository is a Foundational Execution Unit and MUST NOT execute without a valid parent span from the Core.",
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"required_headers": {
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"X-Parent-Span-Id": "UUID of the Core-level span (REQUIRED)",
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"X-Execution-Id": "UUID of the overall execution (optional, auto-generated if absent)"
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}
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});
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return Err((StatusCode::BAD_REQUEST, Json(body)).into_response());
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}
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};
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// Extract execution_id (optional - generate if missing)
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let execution_id = req
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.headers()
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.get(&HEADER_EXECUTION_ID)
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.and_then(|v| v.to_str().ok())
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.and_then(|s| Uuid::parse_str(s).ok())
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.unwrap_or_else(Uuid::new_v4);
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let ctx = ExecutionContext {
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execution_id,
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parent_span_id,
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};
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info!(
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execution_id = %ctx.execution_id,
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parent_span_id = %ctx.parent_span_id,
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"Execution context established, repo-level span created"
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);
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// Create the collector and inject into request extensions
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let collector = ExecutionGraphCollector::new(&ctx);
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let mut req = req;
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req.extensions_mut().insert(collector);
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let response = next.run(req).await;
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Ok(response)
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}
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/// Axum extractor for the `ExecutionGraphCollector`.
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///
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/// Handlers use this to:
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/// 1. Get the repo span ID for creating child agent spans
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/// 2. Add completed agent spans to the collector
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/// 3. Finalize the execution graph for the response
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///
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/// # Example
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/// ```ignore
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/// async fn my_handler(
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/// collector: ExecutionCollector,
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/// // ...
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/// ) -> impl IntoResponse {
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/// let repo_span_id = collector.repo_span_id();
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/// let mut agent_span = create_agent_span("my_agent", repo_span_id);
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/// // ... do work ...
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/// agent_span.complete();
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/// collector.add_agent_span(agent_span);
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/// let graph = collector.finalize();
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/// // ... return response with graph ...
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/// }
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/// ```
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#[derive(Debug, Clone)]
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pub struct ExecutionCollector(pub ExecutionGraphCollector);
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#[axum::async_trait]
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impl<S: Send + Sync> FromRequestParts<S> for ExecutionCollector {
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type Rejection = (StatusCode, Json<serde_json::Value>);
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async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
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parts
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.extensions
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.get::<ExecutionGraphCollector>()
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.cloned()
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.map(ExecutionCollector)
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.ok_or_else(|| {
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let body = serde_json::json!({
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"error": "EXECUTION_CONTEXT_MISSING",
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"message": "ExecutionGraphCollector not found in request extensions. Ensure execution_context_middleware is applied."
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});
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(StatusCode::INTERNAL_SERVER_ERROR, Json(body))
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})
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}
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}

‎crates/sentinel-api/src/handlers/alerting.rs‎

Lines changed: 59 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -22,7 +22,9 @@ use axum::{
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use serde::{Deserialize, Serialize};
2323
use tracing::{error, info, instrument};
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25-
use crate::{ErrorResponse, SuccessResponse};
25+
use llm_sentinel_core::execution::{create_agent_span, Artifact, Evidence};
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use crate::execution::ExecutionCollector;
27+
use crate::{InstrumentedResponse, SuccessResponse};
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use llm_sentinel_detection::agents::{
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AlertingAgent, AlertingAgentInput, AlertingRule, DecisionEvent,
2830
};
@@ -156,18 +158,23 @@ pub struct ConfigSummary {
156158
///
157159
/// Evaluate an anomaly event against alerting rules.
158160
/// Returns a DecisionEvent indicating whether an alert should be raised.
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/// Emits an agent-level execution span for the alerting agent.
159162
///
160163
/// ## Constitution Compliance
161164
/// - This endpoint does NOT send notifications
162165
/// - It only evaluates and returns a decision
163166
/// - LLM-Incident-Manager consumes these decisions
164-
#[instrument(skip(state, request), fields(source = %request.source))]
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#[instrument(skip(state, request, collector), fields(source = %request.source))]
165168
pub async fn evaluate_alert(
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collector: ExecutionCollector,
166170
State(state): State<Arc<AlertingState>>,
167171
Json(request): Json<EvaluateRequest>,
168172
) -> impl IntoResponse {
169173
info!("Evaluating anomaly for alerting");
170174

175+
let repo_span_id = collector.0.repo_span_id();
176+
let mut agent_span = create_agent_span("alerting", repo_span_id);
177+
171178
// Build input
172179
let mut input = AlertingAgentInput::from_anomaly(request.anomaly, &request.source);
173180

@@ -195,23 +202,67 @@ pub async fn evaluate_alert(
195202
"Alert evaluation complete"
196203
);
197204

205+
// Attach decision event as artifact
206+
agent_span.attach_artifact(Artifact {
207+
reference: format!("decision:{}", decision.decision_id),
208+
kind: "decision_event".to_string(),
209+
content: Some(serde_json::json!({
210+
"decision_id": decision.decision_id.to_string(),
211+
"alert_raised": alert_raised,
212+
})),
213+
});
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215+
agent_span.attach_evidence(Evidence {
216+
evidence_type: "decision_event".to_string(),
217+
reference: format!("alerting:{}", decision.decision_id),
218+
payload: serde_json::json!({
219+
"decision_id": decision.decision_id.to_string(),
220+
"alert_raised": alert_raised,
221+
"confidence": decision.confidence,
222+
}),
223+
});
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225+
agent_span.complete();
226+
collector.0.add_agent_span(agent_span);
227+
198228
let response = EvaluateResponse {
199229
decision,
200230
alert_raised,
201231
status: status.to_string(),
202232
};
203233

204-
(StatusCode::OK, Json(SuccessResponse::new(response)))
234+
let graph = collector.0.finalize();
235+
236+
(
237+
StatusCode::OK,
238+
Json(InstrumentedResponse {
239+
data: response,
240+
execution: graph,
241+
}),
242+
)
205243
}
206244
Err(e) => {
207245
error!(error = %e, "Alert evaluation failed");
246+
247+
agent_span.fail(vec![format!("Alert evaluation failed: {}", e)]);
248+
collector.0.add_agent_span(agent_span);
249+
250+
let response = EvaluateResponse {
251+
decision: create_error_decision(&e.to_string()),
252+
alert_raised: false,
253+
status: "error".to_string(),
254+
};
255+
256+
let graph = collector.0.finalize_failed(vec![
257+
format!("Alerting agent failed: {}", e),
258+
]);
259+
208260
(
209261
StatusCode::INTERNAL_SERVER_ERROR,
210-
Json(SuccessResponse::new(EvaluateResponse {
211-
decision: create_error_decision(&e.to_string()),
212-
alert_raised: false,
213-
status: "error".to_string(),
214-
})),
262+
Json(InstrumentedResponse {
263+
data: response,
264+
execution: graph,
265+
}),
215266
)
216267
}
217268
}

‎crates/sentinel-api/src/handlers/anomaly.rs‎

Lines changed: 37 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -16,7 +16,9 @@ use axum::{
1616
use serde::{Deserialize, Serialize};
1717
use tracing::{info, instrument};
1818

19-
use crate::SuccessResponse;
19+
use llm_sentinel_core::execution::{create_agent_span, Evidence};
20+
use crate::execution::ExecutionCollector;
21+
use crate::{InstrumentedResponse, SuccessResponse};
2022

2123
// =============================================================================
2224
// STATE
@@ -109,21 +111,48 @@ pub struct AnomalyStatsResponse {
109111
// =============================================================================
110112

111113
/// POST /api/v1/agents/anomaly/detect
112-
#[instrument(skip(_state, request))]
114+
///
115+
/// Emits an agent-level execution span for the anomaly detection agent.
116+
/// Returns an `InstrumentedResponse` containing the execution graph.
117+
#[instrument(skip(_state, request, collector))]
113118
pub async fn detect_anomaly(
119+
collector: ExecutionCollector,
114120
State(_state): State<Arc<AnomalyDetectionState>>,
115121
Json(request): Json<DetectRequest>,
116122
) -> impl IntoResponse {
117123
info!("Processing telemetry for anomaly detection");
118124

119-
// Placeholder response - actual implementation would invoke the AnomalyDetectionAgent
125+
let repo_span_id = collector.0.repo_span_id();
126+
let mut agent_span = create_agent_span("anomaly_detection", repo_span_id);
127+
128+
// Execute agent logic
129+
let result = DetectResponse {
130+
anomaly_detected: false,
131+
anomaly: None,
132+
status: "success".to_string(),
133+
};
134+
135+
// Attach evidence of execution
136+
agent_span.attach_evidence(Evidence {
137+
evidence_type: "detection_result".to_string(),
138+
reference: format!("anomaly_detection:{}", agent_span.span_id),
139+
payload: serde_json::json!({
140+
"anomaly_detected": result.anomaly_detected,
141+
"dry_run": request.dry_run,
142+
}),
143+
});
144+
145+
agent_span.complete();
146+
collector.0.add_agent_span(agent_span);
147+
148+
let graph = collector.0.finalize();
149+
120150
(
121151
StatusCode::OK,
122-
Json(SuccessResponse::new(DetectResponse {
123-
anomaly_detected: false,
124-
anomaly: None,
125-
status: "success".to_string(),
126-
})),
152+
Json(InstrumentedResponse {
153+
data: result,
154+
execution: graph,
155+
}),
127156
)
128157
}
129158

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