AWS put agent discovery behind an approval gate—but that does not authorize the tool at runtime

AWS has made Agent Registry generally available in GovCloud US-West, giving public-sector teams a managed catalog for MCP servers, tools, agents, skills and custom resources. The launch adds an approval workflow, a native MCP endpoint and CloudTrail audit logging to the region (AWS launch).

The important operational point is what the registry does not do. Approval decides which records become discoverable; it is not a blanket authorization for an agent to execute the underlying tool.

Treat the catalog and the runtime as separate control planes

AWS describes a workflow in which publishers submit records, curators approve or reject them, and consumers search or browse only the approved catalog. Administrators can also deprecate records that should no longer be found (Agent Registry documentation). That is a strong control for inventory quality: builders and agents can find an approved resource instead of relying on an unreviewed endpoint copied into a prompt or configuration file.

But a registry record is metadata about a resource. AWS documents separate services for hosting agents and MCP servers, converting APIs into MCP-compatible tools, and managing identity and credentials. The registry itself can authenticate search and MCP access with IAM credentials or corporate-identity JWTs (Agent Registry documentation). Those boundaries mean a discoverable tool still needs its own invocation permissions and data-access policy.

For a data agent, this distinction matters. A registry approval can establish that an MCP server is the organization’s sanctioned interface for analytics, but it does not prove that every user or agent should be able to query every database behind it. Keep warehouse roles, row- and column-level controls, and write permissions attached to the runtime identity rather than treating catalog membership as the grant.

A practical deployment checklist

Use the registry approval as the publication gate: verify the owner, endpoint, schema, intended environment and support status before a record becomes discoverable. Separate development, QA and production registries—or at least encode the lifecycle stage clearly—because AWS allows registries to be organized by environment, team or resource type (Agent Registry documentation).

Then test the second gate independently. Confirm that an approved record can be discovered by the intended principals, while the underlying tool rejects unauthorized invocation. Log registry API activity in CloudTrail, but retain runtime and downstream data-system logs as well; the regional launch specifically identifies CloudTrail as the registry audit surface (AWS launch).

The result is a cleaner model: approval says this is the tool we endorse; runtime authorization says this principal may use it for this action. GovCloud availability makes the first control easier for regulated teams, but it does not replace the second.