@dollhousemcp/mcp-server
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DollhouseMCP - A Model Context Protocol (MCP) server that enables dynamic AI persona management from markdown files, allowing Claude and other compatible AI assistants to activate and switch between different behavioral personas.
111 lines • 13.1 kB
JavaScript
/**
* Resilience Metrics Tracker
*
* Provides observability into agent execution resilience actions:
* auto-continuations past step limits, step retries, auto-restarts,
* circuit breaker trips, and outcome tracking after resilience fires.
*
* Issue #526: Visibility into how often resilience actions fire and
* whether they lead to successful completions.
*/
import { logger } from '../../utils/logger.js';
// ============================================================================
// Metrics tracker
// ============================================================================
/**
* Lightweight in-memory tracker for agent resilience patterns.
* Issue #526: Provides observability into auto-continue, retry, and
* circuit breaker behaviour during agent execution.
*/
export class ResilienceMetricsTracker {
_autoContinuations = 0;
_autoRestarts = 0;
_stepRetries = 0;
_resilienceLimitsReached = 0;
_circuitBreakerTrips = 0;
_successAfterResilience = 0;
_failureAfterResilience = 0;
static LOG_INTERVAL = 25;
recordAutoContinuation() {
this._autoContinuations++;
this.maybeLogSnapshot();
}
recordAutoRestart() {
this._autoRestarts++;
this.maybeLogSnapshot();
}
recordStepRetry() {
this._stepRetries++;
this.maybeLogSnapshot();
}
recordResilienceLimit() {
this._resilienceLimitsReached++;
this.maybeLogSnapshot();
}
recordCircuitBreakerTrip() {
this._circuitBreakerTrips++;
this.maybeLogSnapshot();
}
recordCompletionAfterResilience(success) {
if (success) {
this._successAfterResilience++;
}
else {
this._failureAfterResilience++;
}
this.maybeLogSnapshot();
}
getSnapshot() {
return {
autoContinuations: this._autoContinuations,
autoRestarts: this._autoRestarts,
stepRetries: this._stepRetries,
resilienceLimitsReached: this._resilienceLimitsReached,
circuitBreakerTrips: this._circuitBreakerTrips,
successAfterResilience: this._successAfterResilience,
failureAfterResilience: this._failureAfterResilience,
};
}
/** Reset all counters (for testing). */
reset() {
this._autoContinuations = 0;
this._autoRestarts = 0;
this._stepRetries = 0;
this._resilienceLimitsReached = 0;
this._circuitBreakerTrips = 0;
this._successAfterResilience = 0;
this._failureAfterResilience = 0;
}
get _totalActions() {
return (this._autoContinuations +
this._autoRestarts +
this._stepRetries +
this._resilienceLimitsReached +
this._circuitBreakerTrips);
}
maybeLogSnapshot() {
if (this._totalActions > 0 &&
this._totalActions % ResilienceMetricsTracker.LOG_INTERVAL === 0) {
logger.info('Resilience metrics snapshot', {
...this.getSnapshot(),
});
}
}
}
/** Module-level singleton instance (Issue #526) */
export const resilienceMetrics = new ResilienceMetricsTracker();
/**
* Get the current resilience metrics snapshot.
* Issue #526: Programmatic access for monitoring/diagnostics.
*/
export function getResilienceMetrics() {
return resilienceMetrics.getSnapshot();
}
/**
* Reset resilience metrics (for testing only).
* @internal
*/
export function resetResilienceMetrics() {
resilienceMetrics.reset();
}
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* Resilience Metrics Tracker\n *\n * Provides observability into agent execution resilience actions:\n * auto-continuations past step limits, step retries, auto-restarts,\n * circuit breaker trips, and outcome tracking after resilience fires.\n *\n * Issue #526: Visibility into how often resilience actions fire and\n * whether they lead to successful completions.\n */\n\nimport { logger } from '../../utils/logger.js';\n\n// ============================================================================\n// Metrics snapshot interface\n// ============================================================================\n\n/**\n * Snapshot of resilience metrics counters.\n * Non-persisted, in-memory counters reset on server restart.\n */\nexport interface ResilienceMetricsSnapshot {\n  /** Total auto-continuations triggered (agent continued past step limit) */\n  autoContinuations: number;\n  /** Total auto-restarts triggered (agent restarted after failure) */\n  autoRestarts: number;\n  /** Total step retries triggered (individual step retried after error) */\n  stepRetries: number;\n  /** Times maxContinuations/maxRetries exhausted, forcing a pause */\n  resilienceLimitsReached: number;\n  /** Times circuit breaker engaged (repeated failures tripped breaker) */\n  circuitBreakerTrips: number;\n  /** Executions that completed successfully after at least one resilience action */\n  successAfterResilience: number;\n  /** Executions that failed/aborted after at least one resilience action */\n  failureAfterResilience: number;\n}\n\n// ============================================================================\n// Metrics tracker\n// ============================================================================\n\n/**\n * Lightweight in-memory tracker for agent resilience patterns.\n * Issue #526: Provides observability into auto-continue, retry, and\n * circuit breaker behaviour during agent execution.\n */\nexport class ResilienceMetricsTracker {\n  private _autoContinuations = 0;\n  private _autoRestarts = 0;\n  private _stepRetries = 0;\n  private _resilienceLimitsReached = 0;\n  private _circuitBreakerTrips = 0;\n  private _successAfterResilience = 0;\n  private _failureAfterResilience = 0;\n\n  private static readonly LOG_INTERVAL = 25;\n\n  recordAutoContinuation(): void {\n    this._autoContinuations++;\n    this.maybeLogSnapshot();\n  }\n\n  recordAutoRestart(): void {\n    this._autoRestarts++;\n    this.maybeLogSnapshot();\n  }\n\n  recordStepRetry(): void {\n    this._stepRetries++;\n    this.maybeLogSnapshot();\n  }\n\n  recordResilienceLimit(): void {\n    this._resilienceLimitsReached++;\n    this.maybeLogSnapshot();\n  }\n\n  recordCircuitBreakerTrip(): void {\n    this._circuitBreakerTrips++;\n    this.maybeLogSnapshot();\n  }\n\n  recordCompletionAfterResilience(success: boolean): void {\n    if (success) {\n      this._successAfterResilience++;\n    } else {\n      this._failureAfterResilience++;\n    }\n    this.maybeLogSnapshot();\n  }\n\n  getSnapshot(): ResilienceMetricsSnapshot {\n    return {\n      autoContinuations: this._autoContinuations,\n      autoRestarts: this._autoRestarts,\n      stepRetries: this._stepRetries,\n      resilienceLimitsReached: this._resilienceLimitsReached,\n      circuitBreakerTrips: this._circuitBreakerTrips,\n      successAfterResilience: this._successAfterResilience,\n      failureAfterResilience: this._failureAfterResilience,\n    };\n  }\n\n  /** Reset all counters (for testing). */\n  reset(): void {\n    this._autoContinuations = 0;\n    this._autoRestarts = 0;\n    this._stepRetries = 0;\n    this._resilienceLimitsReached = 0;\n    this._circuitBreakerTrips = 0;\n    this._successAfterResilience = 0;\n    this._failureAfterResilience = 0;\n  }\n\n  private get _totalActions(): number {\n    return (\n      this._autoContinuations +\n      this._autoRestarts +\n      this._stepRetries +\n      this._resilienceLimitsReached +\n      this._circuitBreakerTrips\n    );\n  }\n\n  private maybeLogSnapshot(): void {\n    if (\n      this._totalActions > 0 &&\n      this._totalActions % ResilienceMetricsTracker.LOG_INTERVAL === 0\n    ) {\n      logger.info('Resilience metrics snapshot', {\n        ...this.getSnapshot(),\n      });\n    }\n  }\n}\n\n/** Module-level singleton instance (Issue #526) */\nexport const resilienceMetrics = new ResilienceMetricsTracker();\n\n/**\n * Get the current resilience metrics snapshot.\n * Issue #526: Programmatic access for monitoring/diagnostics.\n */\nexport function getResilienceMetrics(): ResilienceMetricsSnapshot {\n  return resilienceMetrics.getSnapshot();\n}\n\n/**\n * Reset resilience metrics (for testing only).\n * @internal\n */\nexport function resetResilienceMetrics(): void {\n  resilienceMetrics.reset();\n}\n"]}