Yichen Jiang
6de470e61b
Review found `127.0.0.2` routed through the proxy. The bypass list carries four literal loopback entries because that is all a consumer reading an environment can match, and `proxyForUrl` matched only those — leaving the rest of `127.0.0.0/8`, `0.0.0.0`, and the IPv4-mapped spellings routed through a proxy that could then reach them. Loopback is now recognised structurally, which a list entry cannot express; the published entries stay for the environment readers. The same review case exposed a wider one. `web_fetch` skips its address checks on a proxied hop, because the proxy resolves the origin — but a literal needs no resolution, so the skip bought nothing and let a proxy on this machine reach every private range those checks refuse, `169.254.169.254` included. A literal the checks would refuse now takes the validated path, where the existing refusal already covers it. Tests that proved a tunnelled hop used a loopback origin, which no policy can route through a proxy any more. They name a host only the proxy can answer for instead — closer to what a proxied request actually looks like. The user guide promised the proxy carried every outbound request including telemetry. It carries neither on an older Node, nor anything a model-authored script sends, so the promise is narrowed and the exceptions listed. A password in a proxy URL reaching every tool DSH runs is documented there too: it is how the variable already behaves, and worth knowing before putting one in.
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.
For agents, follow AGENTS.md.
License
Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.