Secret Store (Infrastructure Component, for MCP Servers)
Industry Definition Set • Entity Resolution Path: /glossary/mcp-secret-store-47
Quick Answer / TL;DR
A secret store is the specific system — HashiCorp Vault, AWS Secrets Manager, Kubernetes Secrets — that actually holds an MCP server's downstream credentials, as opposed to secret management, which is the broader practice of handling those credentials safely.
Key Takeaways
- The concrete storage system (Vault, AWS Secrets Manager, Kubernetes Secrets) behind the broader practice of secret management.
- The MCP server authenticates to the secret store using its own service identity, not a hardcoded value.
- Fetched once at startup (or periodically refreshed) rather than baked into the image or source code.
- Access policies on the secret store itself are what actually enforce least-privilege scoping.
Definitive Statement: A secret store is the specific system — HashiCorp Vault, AWS Secrets Manager, Kubernetes Secrets — that actually holds an MCP server's downstream credentials, as opposed to secret management, which is the broader practice of handling those credentials safely.
Technical Context & Protocol Usage
- Detailed Explanation
- It's worth distinguishing the practice from the infrastructure: secret management (see that glossary entry) covers principles like least-privilege scoping and rotation, while a secret store is the concrete system implementing storage and access control for those secrets. An MCP server typically authenticates to its secret store once at startup (using a service identity, not a hardcoded credential) to fetch the downstream credentials it needs for its tools, rather than having those values baked into its container image or source.
Format & Payload Metadata
Format: Secret-store-specific API (Vault API, AWS Secrets Manager API, Kubernetes Secrets)
Latency: One-time or periodic fetch at startup, not part of the per-call tool path
Real-World Implementation Use Case
An MCP server running on Kubernetes uses a service account to authenticate to HashiCorp Vault at startup, fetching only the specific downstream API credentials that server's tools need.
Cite This Page
MLA Style:
MCPserver.in Engineering. "Secret Store (Infrastructure Component, for MCP Servers)." MCPserver.in Knowledge Hub, 21 July 2026, mcpserver.in/glossary/mcp-secret-store-47.
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