TypeSafe Jev for DeepSeek Harness, the Model Context Protocol, and plain Node: typed judgments instead of prose, offline by default.
TypeSafe Jev for DeepSeek Harness and any other MCP host.
Jev is not a chat model. It answers typed questions — noul (yes/no), choice, score — and returns calibrated probabilities. It does not write prose, and asking it to is a category error. This project gives an agent exactly that surface, and nothing more.
Offline by default. Egress disclosed. Nothing default-on.
Package What it is Use it when --------- jevcore The decisions. Imports nothing from DeepSeek Harness or Cordis. You want Jev in a plain script, a service, or your own harness jevcore-dsh The DSH plugin: one service, three tools, two opt-in gates You are running DeepSeek Harness jevcore-mcp The same three tools over MCP, with a stdio binary Your host speaks MCP but is not DSH
The adapters are thin on purpose. packages/dsh is four files: it declares tool schemas and translates hook payloads. Everything decision-shaped — the primitives, the providers, the egress contract, the policy, the gates — lives in core, so a new adapter cannot drift from the guarantees the others make. One runtime requirement differs across the three: jevcore-dsh tracks the harness and needs Node ^22.19.0 =24.0.0, while jevcore and jevcore-mcp need =20.
Between 2026-09-17 and 09-20, nineteen plugins appeared that wire Jev into DSH. Auditing their source found a consistent pattern: the module labelled guard, gate, or warden was also the module shipping prompts, tool arguments, and file contents to a third party, and the README generally did not say so. Several were enabled by default. One gate could be reconfigured by the model it was
From the project README.
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Reuse Agent Skills across DeepSeek Harness and MCP. Check local SKILL.md files in the browser or CI, with parser diagnostics, file hashes and clear exit codes. Try the Hugging Face playground.
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