How a Stateless AgentCore Runtime Led to a Smarter MCP Write Design

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A team building an MCP server on Amazon Bedrock AgentCore Runtime for AWS Marketplace seller operations encountered a key architectural constraint: the runtime is fully stateless with per-session microVM isolation, making it impossible to store pending operations between calls. Rather than adding a database to temporarily hold unconfirmed changes, the team devised a deterministic token system that hashes the change set alongside the entity version, eliminating the need for any server-side state. This approach automatically invalidates tokens if the change set is edited after preview or if the underlying product data shifts before submission, enforcing human review without persistent storage. The developers noted that AgentCore Runtime functions essentially as container hosting with an MCP-shaped contract and does not include a built-in model. They also flagged unexpected cost patterns, warning that CloudWatch logging expenses can exceed compute costs if left unconfigured.

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ProgrammingDEV Community ·

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