dsh-compressor

DeepSeek Harness bundle. Compresses long tool results in-process and restores them with compressor_retrieve.

On 20 redacted real DSH sessions, Session.deriveMessages() JSON shrank by up to 20%. Official spill left verbatim. Reproduce: node scripts/measure-sessions.mjs.

Install into a DSH profile

dsh plugin forwards to pnpm in $DSH_HOME/profiles/<name>. Relative paths are resolved from the directory you run dsh in.

Local checkout

dsh plugin --profile web add ./plugins/dsh-compressor

GitHub subdirectory (plugin is not the repo root)

dsh plugin --profile web add github:lifeodyssey/dsh-compressor#path:plugins/dsh-compressor

npm (after npm publish from this directory)

dsh plugin --profile web add dsh-compressor

Confirm the layer:

dsh --profile web --dump-config

You should see # == dsh-compressor and id: dsh-compressor.

pnpm must be on PATH. Git-hosted installs may ask you to allow a prepare/build script under the profile’s pnpm-workspace.yaml (allowBuilds). This package ships prebuilt native/*.node and compiled lib/; it should not need rustc on the user’s machine.

Behavior

Hooks:

• agent/pre-step — rewrite eligible tool/result nodes on the session surface so Session.deriveMessages() sees the crushed form
• tools/post-execute — crush a new tool result as it is accepted

Originals: $DSH_HOME/dsh-compressor/<sha256>. Retrieve: compressor_retrieve with <<compressor:64hex>> or the bare hash.

Crushers: official Headroom Rust Log / Smart / Text / Search / Diff via napi (darwin-arm64, linux-x64-gnu). Code-aware off. Kompress off. CCR retrieve is not the user protocol.

Official DSH spill (preview + filesystem path + read/grep) is left alone.

Develop / test

pnpm install
pnpm test
pnpm typecheck

Rebuild JS after source edits: pnpm build. Rebuild the native addon only if you change Rust crushers: pnpm build:native (needs the repo’s Cargo workspace).

Publish to npm

The npm name dsh-compressor is currently free. Publish this directory, not the repository root.

pnpm install
pnpm build
# confirm files: lib/, native/*.node, cordis.patch.yml
npm publish --access public

Then users install with dsh plugin --profile web add dsh-compressor. Bump version in package.json for each release.

Requires an npm account with publish rights. Do not commit .npmrc tokens.