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docs: plan secure Rust Grocy MCP implementation

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2026-10-01 00:39:06 +03:00
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docs/superpowers/specs/2026-10-01-hermes-grocy-mcp-design.md
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# Hermes Grocy MCP: design
Date: 2026-10-01. Status: written design for human review; implementation has not started.
Date: 2026-10-01. Status: written design approved; implementation plan in preparation.
## Agreed outcome
Build a lightweight Rust stdio MCP for a self-hosted Grocy instance. Hermes must receive useful data and support full household reads and writes: creation, updates, deletion, and domain actions. Credentials and private connection information belong in the selected desktop wallet. Setup must work for a person without an LLM. Every MCP request to Grocy, including enrollment and diagnostics, goes through its API. Test against a disposable local Docker instance, not an existing household or the public demo. Maintain a clean AGPL-3.0-only repository using the contributor's existing public Git identity, without assistant attribution or personal artifacts.
The earlier conversational direction is approved. This document is the architectural review checkpoint before the implementation plan. No further preference questions are needed to define the first release.
The conversational direction and this written design are approved. The implementation plan is the remaining architectural review checkpoint. No further preference questions are needed to define the first release.
## Approach and boundaries