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A Session-list row no longer carries every registered client view: the three units whose values a list row never renders (`turnOutline`, `sessionStats`, and `todos`) are excluded, which removes the whole-log turn outline and the figure and todo payloads from every row. An opened Session is unchanged — `session/follow`, the `session/control` baseline, and `session.projections` still serve every projected key. The exclusion is one type-level mark plus one registration interlock: `SessionProjectionSummaryExcluded<T>` marks a map entry, and `ProjectionDefinition.wire` requires `summary: false` exactly on a marked key and rejects it everywhere else, so the mark and the declaration cannot drift. A nullable entry keeps `null` outside the wrapper, so `todos` stays `TodoItem[] | null`. `summaryKeys()` returns the derived set, stable until a registration or its disposal changes the key table, and the existing key-taking read faces (`cachedSnapshot`, `viewCheckpoint`) accept that set directly, so summaries need no separate read face and no per-read key copy. `packages/api/session-controller/src/list.ts` passes the set to the live and cold cached faces; `cachedPredecessorTitle` is untouched. Client types only: `SessionSummary.projectionValues` narrows to `SessionProjectionSummaryValues`, `SessionProjectionSnapshot.values` keeps every view value with the mark stripped, and no wire field or client name changed. The cache, subsystem page, and package README document the summary rule and the two read faces.
DeepSeek Harness
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DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI.
It is built on an everything-is-a-plugin architecture and powered by Cordis, whose design is described in A Programming Paradigm for Spatiotemporal Composability.
Documentation: https://deepseek-harness.github.io/deepseek-harness/
Developer preview
DeepSeek Harness is in developer preview and iterating rapidly. THERE WILL BE COMPATIBILITY-BREAKING CHANGES.
Review the safety notice before running the project.
Run
Run from npm
Install Node.js, then run:
npx @deepseek-ai/dsh web
The command starts the Web UI at http://127.0.0.1:3080 by default and opens it in the default browser for a local launch. An SSH launch only prints the host URL because the SSH client or editor owns the local forwarded address. Pass --no-open to run the server without opening a browser. See Web UI guide.
Run from source
To run from a repository checkout:
git clone https://github.com/deepseek-ai/deepseek-harness.git
cd deepseek-harness
pnpm install
pnpm run build
pnpm dsh web
pnpm run build prepares the repository artifacts. pnpm dsh web uses those built artifacts without rebuilding.
Community and support
- Submit feedback or bug reports through GitHub Discussions.
- Add the
dsh-plugintopic to your plugin repository for discoverability. - Join DeepSeek Harness Discord community.
Contributing
See CONTRIBUTING.md.
Development
Start with the development guide and architecture documentation.
pnpm run dev:web builds, serves, and rebuilds client bundles on source edits in one terminal, and make help lists the matching Make targets for Web and Desktop; the guide's application commands section owns the full table.
For agents, follow AGENTS.md.
Citation
@misc{deepseek-harness2026,
title={DeepSeek Harness: Everything is a Plugin},
author={DeepSeek-AI},
year={2026},
publisher={GitHub},
howpublished={\url{https://github.com/deepseek-ai/deepseek-harness}},
}
License
Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.