How MoEngage turned over 400 APIs into agent tools with AgentCore Gateway
Machine Learning Blog
This article describes how MoEngage used Amazon Bedrock AgentCore Gateway to turn 400+ internal REST APIs into permission-scoped agent tools without exposing them publicly or requiring individual MCP server implementations.
- AgentCore Gateway generates MCP tools directly from OpenAPI specs, eliminating need for 20+ separate MCP servers
- Cedar policies filter tools per agent before serialization, keeping 400-tool catalogs out of context windows
- Managed egress over Amazon VPC Lattice provides private connectivity across seven AWS Regions without per-API networking
- Semantic search capability lets agents discover tools by describing tasks instead of memorizing tool names
- API onboarding reduced from days to hours with simple OpenAPI spec annotations and CI automation
- Identity travels as headers, not tool parameters, preventing models from accessing or modifying tenant/user context
By separating concerns between product teams (API ownership) and platform teams (protocol/policy/connectivity), MoEngage saved approximately six months of engineering effort and enabled search-first agent design patterns.
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