Interface LDGraphTracker

Tracks graph-level and edge-level metrics for an agent graph invocation.

Graph-level methods enforce at-most-once semantics: calling the same method twice on a tracker instance drops the second call and emits a warning. Edge-level methods (trackRedirect, trackHandoffSuccess, trackHandoffFailure) are multi-fire and are not subject to this constraint.

Example

const tracker = graphDefinition.createTracker();
try {
  // ... execute graph ...
  tracker.trackInvocationSuccess();
  tracker.trackDuration(durationMs);
} catch {
  tracker.trackInvocationFailure();
}

Hierarchy

  • LDGraphTracker

Implemented by

Properties

resumptionToken

Methods

getSummary getTrackData trackDuration trackHandoffFailure trackHandoffSuccess trackInvocationFailure trackInvocationSuccess trackPath trackRedirect trackTotalTokens

Properties

Readonly resumptionToken

resumptionToken: string

A URL-safe Base64-encoded (RFC 4648, no padding) token encoding the tracker's identity. Pass this token to LDGraphTrackerImpl.fromResumptionToken to reconstruct the tracker across process boundaries, preserving the original runId.

Security note: The token contains the flag variation key and version. If passed to an untrusted client (e.g., a browser) this could expose feature-flag targeting details. Keep the token server-side and use an opaque reference in client-facing APIs.

Methods

getSummary

getTrackData

trackDuration

  • Tracks the total duration of the graph execution in milliseconds. Emits event $ld:ai:graph:duration:total with the duration as the metric value. At-most-once: subsequent calls are dropped with a warning.

    Parameters

    • durationMs: number

      Duration in milliseconds.

    Returns void

trackHandoffFailure

  • Tracks a failed handoff between two nodes. Emits event $ld:ai:graph:handoff_failure with metric value 1.

    Parameters

    • sourceKey: string

      Config key of the source node.

    • targetKey: string

      Config key of the target node.

    Returns void

trackHandoffSuccess

  • Tracks a successful handoff between two nodes. Emits event $ld:ai:graph:handoff_success with metric value 1.

    Parameters

    • sourceKey: string

      Config key of the source node.

    • targetKey: string

      Config key of the target node.

    Returns void

trackInvocationFailure

  • Tracks an unsuccessful graph invocation. Emits event $ld:ai:graph:invocation_failure with metric value 1. At-most-once: subsequent calls are dropped with a warning.

    Returns void

trackInvocationSuccess

  • Tracks a successful graph invocation. Emits event $ld:ai:graph:invocation_success with metric value 1. At-most-once: subsequent calls are dropped with a warning.

    Returns void

trackPath

  • Tracks the execution path through the graph. Emits event $ld:ai:graph:path with metric value 1. The data payload includes the path array in addition to standard track data. At-most-once: subsequent calls are dropped with a warning.

    Parameters

    • path: string[]

      An ordered array of agent config keys representing the execution path.

    Returns void

trackRedirect

  • Tracks when a node redirects to a different target than originally specified. Emits event $ld:ai:graph:redirect with metric value 1.

    Parameters

    • sourceKey: string

      Config key of the source node.

    • redirectedTarget: string

      Config key of the actual target node.

    Returns void

trackTotalTokens

  • Tracks aggregate token usage across the entire graph invocation. Emits event $ld:ai:graph:total_tokens with the total token count as the metric value. At-most-once: subsequent calls are dropped with a warning.

    Parameters

    Returns void

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