Hypatia May
58a0e450b3
foldSurfaceTokens rebuilt the priced surface on every surface event: an append allocated [...nodes, node] and a replacement copied the whole array before splicing, charging every well-formed event O(surface) for an atomicity property only malformed events need. Benchmarks put the copy at ~99.9% of an append's cost (100µs at a 50k-node surface vs 0.1µs for pricing) with O(S²) accumulation over a session, inside the synchronous session/event publication path. Split the fold into the session core's planSurfaceEvent/applySurfacePlan shape: planSurfaceTokens performs every fallible step against the read-only surface, commitSurfaceTokens applies the plan in place and is infallible by construction. _foldEvent plans first, runs the remaining fallible anchor validation, and only then commits, so retry identity is preserved by ordering instead of by allocation. Appends drop to amortized O(1) (100.3µs -> 1.9µs at 50k nodes); replacements keep their O(surface) findIndex but stop paying the extra full copy (21µs -> 4.2µs). A new regression test pins the one hazard this introduces: an event whose surface plan is valid but whose later anchor validation throws must leave the priced surface and running total uncommitted across repeated failures.
DeepSeek Harness
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DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI.
It uses an architecture where everything is a plugin, and is 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 currently in developer preview and is 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
- Feel free to 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.