mcp-nightscout
Enables read-only access to a Nightscout instance for glucose readings, treatments, and deterministic server-side aggregates, allowing users to discuss their diabetes data with an AI assistant without write permissions.
README
mcp-nightscout
What — an MCP server giving Claude read-only access to a Nightscout instance: glucose readings, treatments, and deterministic server-side aggregates (mean, TIR, CV, GMI). For — people running their own Nightscout who want to discuss their data with an AI assistant without handing it write access. Deployed — not deployed — runs locally over stdio. Run — no code yet; see status below.
Status
Pre-code. The design frame is fixed and recorded in docs/decisions/0001-language-and-stack.md: TypeScript on the official MCP SDK, stdio-only, read-only, with a set of security constraints inherited from auditing an existing implementation.
Two decisions are deliberately closed and not up for reopening without a new ADR:
- stdio local only — no HTTP transport, no network port. Most of the vulnerability classes the audit found disappear with the transport.
- Read-only — this server will never write to a Nightscout instance. The threat model is treatment alteration, not data leakage: Nightscout profiles drive dosing calculations in closed-loop setups.
Why another one
The existing Nightscout MCP servers are solo projects, most of them exposing write tools, none of them treating the free-text fields of a shared instance as the prompt-injection surface they are. This one is written from scratch against an explicit threat model. It aims for ~10 read tools and verifiable aggregates — not feature parity with anything.
License
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