dsh-plugin-cli-session

dsh-plugin-cli-session

A resume-capable CLI runner for DeepSeek Harness. It replaces the shipped one-shot headless runner with one that can continue a previous session and, when asked, print a machine-readable envelope instead of prose.

It is the merge of two hand-copied profile runners (a conversational one and a claude -p-style one) whose runner.js/startup.js had drifted into near-duplicates. Everything they actually shared — session resolution, the drive loop, summarisation, exit handling — is one implementation now; what differed is configuration.

Install

Not on npm yet. The built lib/ is committed, so it installs straight from
GitHub — no download, no build step:

dsh plugin --profile chat add github:ghbhiee/dsh-plugin-cli-session

Or from a local clone (a link:, so a local rebuild is picked up):

git clone https://github.com/ghbhiee/dsh-plugin-cli-session.git
dsh plugin --profile chat add ./dsh-plugin-cli-session

Sibling plugins install the same way: dsh-plugin-workbench,
dsh-plugin-mobile-shell,
dsh-plugin-cli-session.

Develop

pnpm install
pnpm run check   # typecheck → vitest → tsdown build

Because lib/ is versioned (it is what a git install serves), rebuild and
commit it with every source change.

Two flavours, one plugin

Conversational (~/.dsh/profiles/chat/cordis.patch.yml):

- id: cli-runner
  config:
    request: !!js ctx.cliStartup
    sessionTag: chat-cli
    announceSessionId: true

Machine-readable (~/.dsh/profiles/api/cordis.patch.yml):

- id: cli-runner
  config:
    request: !!js ctx.cliStartup
    sessionTag: api
    announceSessionId: false

A patch replaces the targeted row's whole config, so request has to be restated in both.

Usage

dsh --profile chat "explain this file"          # new session
dsh --profile chat -r "follow-up"               # resume the newest session here
dsh --profile chat -s <id> "follow-up"          # resume a specific session
dsh --profile chat -w ./scratch "start here"    # new session in another directory
dsh --profile chat -l                           # list this profile's sessions here
dsh --profile api -o json "summarize this"      # {"type":"result",…}
dsh --profile api -o stream-json "summarize"    # init line, then the result line

-o json / -o stream-json emit {type, subtype, is_error, duration_ms, num_turns, result, session_id, usage?}. stream-json prefixes a {type:"system",subtype:"init",…} line carrying the session id, cwd, provider, and model.

Misconfiguration fails at boot

The row's request comes from !!js ctx.cliStartup. Wire it wrong and the config schema's defaults quietly produce action: 'new' with an empty task — a session created and a model call spent on nothing. The runner refuses that at load instead, and says what to write:

cli-runner: no task to run. The row's config.request should be wired to the
startup service, as in `request: !!js ctx.cliStartup`.

A blank sessionTag (the label --list and --resume scope by) and a negative exitGraceMs are refused the same way.

Tests

pnpm test covers both halves without an API key: the runner's pure core (which assistant message is returned, how sessions are scoped by tag, that --json-schema is prompt text) and the command-line contract (every accepted shape, every rejected combination, and that --workdir chdirs before publishing so the sandbox root follows).

Known limitations

• --json-schema is a prompt, not a constraint. The schema is appended to the task text asking for conforming JSON; it is not the provider's structured-output mode. A model can still answer with code fences or commentary, so parse defensively.
• Only the last assistant message is returned. Intermediate turns are in the session log, not in result.
• is_error covers any non-completed turn reason, including a turn that never started.
• sessionTag is stored in agentPreset, a field the harness defines for agent presets. It works as a session label today, but it is a borrowed field, not a documented extension point.
• The hard exit is a fallback, not a design. exitGraceMs after the graceful exit request the process is killed, which can truncate a very slow flush.