Interface ICrossAgentGuardrailService

Cross-agent guardrail service for multi-agent supervision.

Extends IGuardrailService to enable observation and intervention in other agents' output streams. Use this for:

• Supervisor patterns: A supervisor agent monitors worker agents
• Quality gates: Enforce quality standards across an agency
• Policy enforcement: Apply organization-wide rules to all agents
• Safety monitoring: Detect and prevent harmful outputs from any agent

Example: Quality gate guardrail

class QualityGateGuardrail implements ICrossAgentGuardrailService {
  // Observe all agents in the agency
  observeAgentIds = [];
  canInterruptOthers = true;

  async evaluateCrossAgentOutput({ sourceAgentId, chunk, context }) {
    if (chunk.type === 'FINAL_RESPONSE') {
      const quality = await assessQuality(chunk.finalResponseText);
      if (quality.score < 0.5) {
        return {
          action: GuardrailAction.BLOCK,
          reason: 'Response did not meet quality standards',
          metadata: { qualityScore: quality.score, agent: sourceAgentId }
        };
      }
    }
    return null;
  }
}
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Example: Selective agent monitoring

class SensitiveDataGuardrail implements ICrossAgentGuardrailService {
  // Only observe agents handling sensitive data
  observeAgentIds = ['data-analyst', 'report-generator'];
  canInterruptOthers = true;
  config = { evaluateStreamingChunks: true };

  async evaluateCrossAgentOutput({ chunk }) {
    if (chunk.textDelta && containsPII(chunk.textDelta)) {
      return {
        action: GuardrailAction.SANITIZE,
        modifiedText: redactPII(chunk.textDelta)
      };
    }
    return null;
  }
}
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