A controlled inventory of sanctioned integrations, connectors, or MCP servers allowed to operate in production. It turns tool approval into a governance process rather than an individual developer choice and creates a review point for permissions, provenance, and lifecycle control.
Expanded Definition
An Approved Server Registry is the governance source of truth for which integrations, connectors, and mcp server are permitted to run in production. In NHI operations, it separates trusted tooling from ad hoc additions, so approval depends on provenance, access scope, owner accountability, and lifecycle state rather than individual developer judgment. The model is closely aligned with NIST Cybersecurity Framework 2.0 concepts around asset oversight and controlled access, although no single standard governs this term yet and usage in the industry is still evolving.
For NHI security, the registry is more than a list. It creates a control point for reviewing what a server can do, which secrets it may reach, whether it is still supported, and who approved it. That matters because many compromises begin with trusted tooling that was never formally reviewed or later drifted beyond its intended scope. A registry also supports repeatable change management, especially when connectors can request broad data access or invoke actions on behalf of an AI agent. The most common misapplication is treating “approved” as a one-time email or ticket, which occurs when production access is granted without ongoing ownership, expiration, or review.
Examples and Use Cases
Implementing an Approved Server Registry rigorously often introduces friction for fast-moving teams, requiring organisations to weigh developer speed against the security benefit of standardised review and revocation.
- A platform team publishes the only MCP servers allowed in production, with each entry tied to an owner, scope, and review date.
- An AI agent can call a payment reconciliation connector only after the server is added to the registry and its secret handling is validated.
- A security team blocks a new integration until provenance checks confirm the package source, permissions, and dependency chain.
- A decommissioned server is removed from the registry, which triggers key revocation and prevents stale access from persisting unnoticed.
- After a secret leak similar to Massive Docker Hub Secrets Leak, the registry is used to verify which servers ever touched exposed credentials.
This approach complements external guidance such as the NIST Cybersecurity Framework 2.0, because it gives operational teams a concrete inventory to govern.
Why It Matters in NHI Security
Approved Server Registries reduce shadow integrations, prevent uncontrolled tool sprawl, and make it harder for compromised connectors to persist inside production workflows. They are especially important where agents, CI/CD systems, and service accounts can act with machine speed and broad privileges. NHIMG research shows that 97% of NHIs carry excessive privileges, which makes any unreviewed server entry especially dangerous because it can become a high-leverage path into sensitive systems.
The registry also supports incident response and auditability. If a connector is compromised, defenders need to know whether it was formally approved, what it accessed, and whether similar assets exist elsewhere. Without that record, teams often discover their exposure only after secrets are found in places they should never have reached, such as the patterns documented in Docker Hub Auth Secrets in Container Images. An approved registry turns that investigation into a bounded exercise instead of a blind search across unknown tooling. Organisations typically encounter the need for an Approved Server Registry only after an integration is abused, at which point access governance becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10, OWASP Agentic AI Top 10 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Approved tool inventories align to controlling non-human identity sprawl and unauthorized integrations. |
| OWASP Agentic AI Top 10 | A-03 | Agent tool access depends on approved connectors and bounded execution authority. |
| NIST CSF 2.0 | ID.AM-01 | Asset management includes knowing which production integrations are authorized. |
| NIST Zero Trust (SP 800-207) | PA-3 | Policy enforcement requires explicit authorization of every server and connection path. |
| CSA MAESTRO | Agentic AI governance requires controlled tooling, provenance, and lifecycle oversight. |
Maintain a formal inventory of approved servers and revoke anything not explicitly governed.
Related resources from NHI Mgmt Group
- Who should be accountable when a federated MCP registry exposes the wrong server or auth metadata?
- What should teams do when an MCP server appears outside the approved inventory?
- How can organizations secure their MCP server credentials?
- What is the difference between shadow AI and approved SaaS AI usage?
