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§ I · Domain MAS · Control 6 of 9
Control
MAS-06
Edition
v.1.3
Status
Public review

MAS · Multi-Agent Systems

MAS-06Per-hop invocation logging

Each agent-to-agent invocation is logged under MON-01, including caller identity, callee identity, purpose, input, output, and a chain identifier linking the hop to its originating user request.

Each agent-to-agent invocation is logged under MON-01, including caller identity, callee identity, purpose, input, output, and a chain identifier linking the hop to its originating user request. Logs are sufficient to reconstruct the full chain after the fact. This control is the multi-agent extension of MON-01 and is essential for incident investigation in complex agent topologies.

Table MAS-06.1 · Maturity criteria · v.1.3

L1 to L5 · the lowest level in scope caps the agent
L1Ad hoc

Controls exist informally; documentation is incomplete; no consistent review.

L2Documented

Controls are written down; ownership is assigned; review cadence is defined.

L3Operated

Controls are followed in practice; evidence is collected; deviations are tracked.

Per-hop logging is active for all agent-to-agent invocations; chain identifiers are present and sufficient to reconstruct the full chain; log completeness has been verified through sampling.

L4Measured

Control effectiveness is measured against documented thresholds; trends are reported.

L5Continuously Improved

Controls evolve based on incident learning; maturity gains are evidenced over time.

The v1.3 edition publishes a control-specific criterion at L3 (Operated). The other levels apply the general ladder to this control; see the maturity ladder.

Evidence an assessor asks for

  1. E.1

    Per-hop logging is active for all agent-to-agent invocations.

  2. E.2

    Chain identifiers are present and sufficient to reconstruct the full chain.

  3. E.3

    Log completeness has been verified through sampling.

Table MAS-06.2 · Framework mappings

4 of 7 frameworks carry a control-level reference
NIST AI RMFMANAGE 4.1NIST AI Risk Management Framework 1.0
ISO/IEC 42001·ISO/IEC 42001:2023 · Artificial intelligence management system
OWASP LLM Top 10·OWASP Top 10 for Large Language Model Applications
SOC 2 (TSC)CC7.2, CC7.3AICPA Trust Services Criteria for SOC 2 Type II
EU AI ActArt. 14(4)EU AI Act · Regulation (EU) 2024/1689
MITRE ATLAS·MITRE ATLAS · Adversarial Threat Landscape for AI Systems
SingaporeMAIGF AccountabilitySingapore Model AI Governance Framework / AI Verify / PDPA

Mappings are directional: meeting this control evidences but does not by itself satisfy the external requirement. A middle dot means no control-level reference is published at this edition; see the crosswalk.

Related controls and terms

Cite this control

Human Intelligence. HI-AAF v1.3, MAS-06 Per-hop invocation logging. Public review edition, July 2026. https://humanintel.net/standard/mas/mas-06

Edition v.1.3 · July 2026 · Public review · Markdown · PDF

https://humanintel.net/standard/mas/mas-06

Notice

HI-AAF v1.3 is an independent framework published by Human Intelligence. It is not affiliated with NIST, ISO, AICPA, or any government or accreditation body. The framework is offered openly for review during the current draft cycle.