#demo — Blog — Oliver Bühler

Grounding an Agent Without a Vector Database: AgentCore Managed Knowledge Base

August 31, 202618 min read

This is the sixth part of the series Building a Partner Sales Agent on Amazon Bedrock AgentCore: the agent's answers are based on a Bedrock Managed Knowledge Base which draws its information from an S3 document bucket and three web-crawled sources, and which reaches the model via the same Gateway as all the other tools, although it requires a Terraform escape hatch for the one connector target that no provider resource currently covers.

A Deterministic Backstop for Your Agent: AgentCore Policy and Cedar

August 25, 202618 min read

Part 5 of the series ‘Building a Partner Sales Agent on Amazon Bedrock AgentCore’: how the Cedar policy engine bound to the Gateway deterministically blocks two specific bad calls, why a default-deny engine forces a baseline permit before any forbid rule, and exactly where its blindness to conversation history leaves a human-approval guard that verifies the flag but not the approval behind it.

One Gateway, Six Tools: AgentCore Gateway as Your Agent's Only Way Out

August 20, 202618 min read

Part 4 of the series 'Building a Partner Sales Agent on Amazon Bedrock AgentCore': how one AgentCore Gateway fronts six targets across two external systems, why Lambda wrappers beat direct MCP connections here, and the allowed_tools glob syntax that silently hid every tool from the model until token counts caught it.

Configuring AgentCore Runtime: Session Lifecycle, Container Backing, Memory

August 12, 202621 min read

Part 3 of the series 'Building a Partner Sales Agent on Amazon Bedrock AgentCore': how this project configures AgentCore Runtime block by block, session lifecycle, execution-role IAM, model resolution, container backing and memory, with most of the real behavior surfacing only on a live invoke.

Why I Didn't Write My Own Agent Loop: The Case for AgentCore Harness

July 28, 202617 min read

Part 2 of the series 'Building a Partner Sales Agent on Amazon Bedrock AgentCore': why I put this project's agent loop on AWS Bedrock AgentCore Harness instead of hand-rolling one, and how a container-backed Skill led me to grant, then deliberately withhold, shell access on the harness.

Two Systems, One Sales Motion: An AWS Partner Agent on Amazon AgentCore Harness

July 22, 202621 min read

Part 1 of the series "Building a Partner Sales Agent on Amazon Bedrock AgentCore", built around one real project: a conversational agent that connects HubSpot CRM and AWS Partner Central for an AWS Partner's sales team.