Author

Patrick Waweru

Articles by Patrick Waweru, engineer at TechBridge — production notes on the agent systems, protocols and services we build and run.

3 articles

Protocols12 min read

The agent protocols are standardised. Your authorization isn't.

A2A now sits beside MCP at the Agentic AI Foundation, and both leave authorization to you. Delegation versus impersonation, token exchange at every hop, and the RFC 8693 rule that decides where chain policy has to live.

Sep 12, 2026 Read article

AI Engineering10 min read

What an AI agent actually costs — and how to cap it

Token spend is the line item nobody scopes until the bill arrives. How we meter every agent server-side, budget it per agent, and stop runaway spend with a daily kill-switch.

Aug 15, 2026 Read article

Protocols11 min read

A2A in production - tasks, push, and security beyond the demo

The A2A features a hello-world skips but a real multi-agent system can't: push notifications, resubscription, security schemes on the agent card, and typed extensions.

Jul 15, 2026 Read article