C26.0.910 · Agent Fabric: A2A-T Runtime – Phase III Agents that understand telecom. Trusted autonomy for production. Operators are deploying AI agents across all operational layers, but five questions still block them from trusting agents in production: can any agent talk to any other, does it understand what I mean, can I add new ones without re-integrating, does it follow my rules, and can I prove what it did? LF A2A lets agents talk; it answers none of these. This Catalyst does — with working, multi-vendor code that bridges TMF Autonomous Networks standards and open agent protocols. Agent Fabric is built from three major open-source contributions: A2A-T — THE SEMANTIC PROTOCOL. A telecom extension of LF A2A, aligned to TMF IG1453. Task-T, Event-T, and Negotiation-T bind every task to a TM Forum AN High-Value Scenario (HVS) and shared telecom vocabulary (SID), so intent is typed and unambiguous before execution. OpenAN — THE OPEN RUNTIME. Registration Center, Orchestration Center, A2A-T SDK, and a Knowledge Graph that organizes telecom semantics — SID, BPMN corpus, Task-T history — into machine-usable meaning. Any operator can run it, extend it, and contribute to it. AGENT FABRIC — TRUSTED AUTONOMY. The governed production runtime: Trusted Data Gateway, Governance Agent, full audit, design-time and runtime evaluation, and per-decision explainability — agent onboarding through operational accountability. Three High-Value Scenarios put the fabric to work, live and end-to-end, with seven vendors interoperating through one fabric and no bespoke integrations — each achieving L4 Autonomy and delivering measurable operator gains: — HVS 1: cross-domain service fault resolution across RAN and Transport. — HVS 2: enterprise SLA-breach complaint handling, from case to resolution. — HVS 3: enterprise service fulfilment. Contributed as open source: the A2A-T protocol specification (advancing within TMF IG1453, proposed upstream to LF A2A), major parts of the Fabric (OpenAN Registration and Orchestration Centers, Knowledge Graph, and the A2A-T SDK reference implementation), and the operator playbooks behind each HVS. Live multi-vendor demonstration at DTW 2026, Copenhagen.