# Trust tier

A provenance-based level on an agent's identity (first-party/attested, verified third-party, or unverified) that gates what the agent is eligible for and tightens its policy. It is a verified input to every decision, never a bypass: each action is still authorized per request, so there is no implicit trust.

Learn more: [Agent Identity](/content/learn/ai-agent-identity/index.html)

Part of [the Agent Control Fabric](/content/platform/index.html): Highflame's identity, policy, and enforcement substrate for AI agents.

## Keep exploring the glossary.

[**ZeroID**  
Highflame's open-source agent identity core (Apache 2.0), built on OAuth 2.1, SPIFFE/WIMSE, and RFC 8693: the inspectable foundation beneath Highflame Identity.  
Read →](/content/glossary/zeroid/index.html)  
[**A2A (Agent-to-Agent)**  
Communication where one agent delegates work to, or calls, another agent. Each hop has to carry identity and narrow scope. Or authority leaks down the chain.  
Read →](/content/glossary/a2a/index.html)  
[**Adaptive guardrails**  
Runtime controls that tighten themselves as new signals and attack patterns emerge, instead of relying on static rules someone has to keep updating.  
Read →](/content/glossary/adaptive-guardrails/index.html)  
[**Agent Control Fabric**  
Highflame's term for the identity, policy, and enforcement substrate that governs every agent action at every boundary it crosses: one layer, not a bundle of point tools.  
Read →](/content/glossary/agent-control-fabric/index.html)  
[**Agent governance**  
Controlling what an organization's agents are allowed to do and proving what they did: discover every agent, authorize each action against policy, and produce audit evidence. Distinct from AI governance's focus on model risk.  
Read →](/content/glossary/agent-governance/index.html)  
[**Agent identity**  
A verifiable, cryptographic credential issued to an agent that carries agent-shaped claims (owner, trust tier, framework, delegation depth) so every action traces back to a named human.  
Read →](/content/glossary/agent-identity/index.html)