dsh-session-bridge — 会话桥 (Session bridge)

Targets DSH 0.1.7-alpha.1. See compatibility changes.

A DSH plugin that lets the current agent drive other real DSH sessions directly from a prompt — create sessions, send messages to any session, wait for and read replies, resume offline sessions, and find sessions across workspaces. On top of that it can monitor and schedule a main task (watch its progress, nudge or correct its direction, and stop it), and archive sessions the same way the DSH sidebar's Archive action does.

中文文档见 README.zh.md.

What it does

• Create real DSH sessions. session_bridge_create makes a new main session (top-level UI session) in the current workspace, or in another workspace when you pass workspaceId / cwd. It can send one first prompt and optionally block until the first reply. Provider / model / reasoning effort are inherited from the calling session by default. An async create (no waitForReply) returns a sinceSeq anchor for a later precise wait.
• Send messages to any session. session_bridge_send appends a turn (mode=queue) or injects steering into the running step (mode=steer), and can optionally wait for the next reply. An async send also returns a sinceSeq anchor.
• Wait for a reply or a segment. session_bridge_wait blocks until new assistant output appears after sinceSeq (default: the latest event seq at call time): waitFor=reply (default) returns as soon as a new text reply is readable; waitFor=segment returns as soon as any new completed output step appears (an assistant/message — text, reasoning, or tool-call turn), without waiting for the whole turn, so you can observe output paragraph by paragraph as it is produced. With requireTurnEnd it additionally waits for the turn to settle. Timeout / abort return the partial result rather than throwing. An already-landed reply is never lost: when no new output arrives within the budget, the latest PRE-EXISTING reply/segment is returned with stale: true (no more (no text)). To retrieve exactly "the reply to what I sent", pass the sinceSeq returned by session_bridge_send / session_bridge_create (works regardless of caller latency); sinceSeq: -1 counts existing events too, i.e. the anchor for a brand-new session.
• Read any session. session_bridge_read folds a session's event log into readable rows — live or offline (from persistence) — with sinceSeq paging, role filtering, and a limit (default 20, max 100).
• Read output paragraph by paragraph. session_bridge_segments returns the session's completed output segments — every finished assistant step (one assistant/message: its text, reasoning, and requested tool calls) as its own row, paged forward via sinceSeq, returning the next cursor. It works live or offline and does not wait for the whole turn, so you can follow a long agentic run step by step (chain-of-thought included when the model streams it).
• Resume offline sessions. session_bridge_resume brings a persisted session back online (idempotent); it can also override provider / model.
• Find sessions. session_bridge_find matches by title, id, workspace, or directory across all workspaces, returning live/running state, title, and working directory. Bridge-registered titles act as aliases.
• Monitor and schedule a main task. session_bridge_status reads a session's real-time progress (running/idle, open turn, time since the last event for stall detection, pending work, latest reply); only a running session is flagged [STALLED] (a quiet idle session is not stuck — same rule as the watchdog). session_bridge_cancel stops a running session. session_bridge_monitor_start runs a background watchdog loop that polls the task, nudges it when it stalls, corrects it when it drifts, terminates it after it stays stuck, and wraps up when it finishes.
• Archive sessions. session_bridge_archive adds a session to the DSH workspace archive set (hidden from every grouping surface, history and workspace position preserved). session_bridge_archived lists the archive set, optionally resolving titles.

Monitoring worker

session_bridge_monitor_start installs a timer-driven loop. Every poll it observes → judges → schedules → logs the target session:

Observation	Action
A doneKeywords string appears in the reply and the session is idle	Wrap up and stop the watchdog (log DONE)
Idle with no pending work	Wrap up (settled) — no pointless nudging / cancelling
running and no event for more than stalledMs	Record a stall → steer a nudge (with useLlm, judge offtrack/stuck first)
Stall repeats ≥ maxStuckCycles	cancel the session
Making progress	Reset the stall counter (steady)

The watchdog only treats running sessions as stalled, so a finished or idle task is wrapped up rather than nudged forever (the [STALLED] marker in session_bridge_status follows the same rule and is shown for running sessions only). Logs go to ~/.dsh/super-injector/dsh-session-bridge-monitor.log (overridable).

Control it with session_bridge_monitor_start / _stop / _list.

Chain-of-thought monitoring & rules

The bridge can watch another session's chain-of-thought (reasoning) in real time — not just its final reply — and act on it:

• Observe it live. session_bridge_status returns three chain-of-thought fields on a running session: lastReasoning (the most recent finalized reasoning block), liveReasoning (the in-flight reasoning streamed for the current handled turn, from assistant/chunk reasoning-delta events), and reasoningTail (a compact, char-bounded merged preview). Use the reasoning param (none | last | live | tail) to pick which fields come back; tail is the default and costs the least.

• Read paragraph by paragraph. session_bridge_segments returns each completed output step (one assistant/message — text, reasoning, or tool-call turn) as its own segment, paged forward via sinceSeq, without waiting for the whole turn.

• Or read it per message. session_bridge_read with includeReasoning returns the finalized reasoning of each assistant message.

• Enforce rules. session_bridge_monitor_start accepts coRules — an array of { match: contains|not-contains, field: reasoning|text|both, value: string, action: steer|cancel, message?: string } and cotMinHits. Each poll the watchdog matches the rule's condition against the live reasoning/text and, once it stays matched for cotMinHits consecutive polls (default 1), fires the action: steer injects a guiding user message, cancel terminates the session. Example — "stop the session the moment its reasoning no longer contains I'm" becomes:

  coRules: [{ "match": "not-contains", "field": "reasoning", "value": "I'm", "action": "cancel" }]
  

  Caveats: a not-contains rule on reasoning deliberately does not fire when the target session produces no reasoning at all (e.g. a non-reasoning model or reasoningEffort off), so you don't cancel sessions that simply don't stream a chain-of-thought. Repeated fires are throttled by a cooldown, and each evaluation/trigger is written to the monitor log.

Requirements

• Node.js ≥ 20
• pnpm
• DSH 0.1.7-alpha.1 (^0.1.7-0).

Build

# Install locked DSH release packages, then type-check and build
pnpm install --frozen-lockfile
pnpm build

# type-check src/ against the dsh that is actually installed (no checkout needed)
npm run check:compat

# regression tests for the wait/stall core logic (Node type stripping)
npm test

# via the injector toolchain
dev_build_plugin dsh-session-bridge

Builds use the locked 0.1.7-alpha.1 registry packages; no source checkout is required. check:compat verifies the installed harness types and bundle provenance. CI uses the same lockfile.

Deploy

DSH web loads external plugins from the active profile. This package is a bundle: its package.json declares dsh.bundle.patch → cordis.patch.yml, whose insert row mounts the plugin. That declaration is what lets dsh plugin add install the package and activate it in one step.

Install from npm

The package is published to npmjs.com. Releases are cut on a v* git tag by the publish.yml GitHub Actions workflow; package.json and dsh.plugin.json versions are synced to that tag before publishing.

npx -p @deepseek-ai/dsh dsh plugin --profile web add dsh-session-bridge

A prerelease tag (v0.3.2-alpha.1) is published to its own dist-tag (alpha, beta, rc) instead of latest, so it cannot displace the stable release for other users. Opt in explicitly:

npx -p @deepseek-ai/dsh dsh plugin --profile web add dsh-session-bridge@alpha

pnpm installs the published tarball and runs its prepare script (tsdown) to ensure lib/ is present, then dsh activates the bundle.

Install from GitHub

npx -p @deepseek-ai/dsh dsh plugin --profile web add github:heartmove/dsh-session-bridge

dsh plugin forwards to pnpm inside ~/.dsh/profiles/web/, then reconciles the bundle into the profile's dsh.profile.bundles layer list. A git install fetches sources, so pnpm runs the package's prepare script (tsdown) to build lib/ from src/ after checkout.

pnpm ≥ 10 refuses to run a git dependency's prepare script until it is allowlisted, so the first add fails with an "Ignored build scripts" hint. Copy the exact package key pnpm printed into the profile's pnpm-workspace.yaml (~/.dsh/profiles/web/pnpm-workspace.yaml):

allowBuilds:
  dsh-session-bridge: true

then re-run the add. That allowance means "run this package's code on my machine at install time" — only allow packages whose source you trust, and pin a commit (github:heartmove/dsh-session-bridge#<sha>) so a later push cannot silently change what runs.

Restart dsh web, then hard-refresh the page (Ctrl/Cmd+Shift+R).

Install from a local checkout

From the directory that contains this checkout:

npx -p @deepseek-ai/dsh dsh plugin --profile web add ./dsh-session-bridge

pnpm links the checkout and dsh activates the bundle the same way.

Manual link

To manage the profile by hand, link the package and list it as a bundle in ~/.dsh/profiles/web/package.json (the bundle's own cordis.patch.yml supplies the loader row, so no insert entry is needed):

{
  "dependencies": {
    "dsh-session-bridge": "link:D:\\path\\to\\dsh-session-bridge"
  },
  "dsh": {
    "profile": {
      "bundles": ["@deepseek-ai/dsh-base", "@deepseek-ai/dsh-web-app", "dsh-session-bridge"]
    }
  }
}

(On POSIX systems use link:/path/to/dsh-session-bridge.) Then run pnpm install in the profile directory and restart dsh web.

Inject directly (dev)

For fast iteration while developing the plugin, you can also load it directly through the injector toolchain (no bundle entry required):

dev_inject_plugin D:\code\dsh-session-bridge

Remove it with dev_uninject_plugin dsh-session-bridge (clears the injector registration and junction; not re-assembled on restart).

Usage

Tool	What it does
session_bridge_create	Create a main session (current or another workspace via workspaceId / cwd); optional first prompt + waitForReply; async creates return a sinceSeq anchor.
session_bridge_send	Send a message (mode=queue/steer); optional wait-for-reply; async sends return a sinceSeq anchor.
session_bridge_wait	Wait for new output after sinceSeq (default: latest seq at call time; -1 counts existing events): waitFor=reply (text) or waitFor=segment (any completed step, no full-turn wait); optional requireTurnEnd; falls back to the pre-existing reply with stale when nothing new arrives.
session_bridge_read	Read messages — live or offline; sinceSeq paging, role filter, limit.
session_bridge_segments	Read completed output segments (each finished assistant step) incrementally by paragraph — live or offline.
session_bridge_resume	Bring a persisted session back online (idempotent).
session_bridge_find	Find sessions by title / id / workspace / directory across workspaces.
session_bridge_status	Read a session's live progress (running, open turn, stall detection, pending work, latest reply) plus live/finalized chain-of-thought (reasoning param); [STALLED] is shown for running sessions only.
session_bridge_cancel	Stop a running session (abort active turn; clear queued/steering work unless keepInbox).
session_bridge_monitor_start	Start a background watchdog on a main session (poll, nudge, correct, cancel, wrap up); supports chain-of-thought coRules (e.g. reasoning not-contains "I'm" → cancel).
session_bridge_monitor_stop	Stop a watchdog (keep the session itself running).
session_bridge_monitor_list	List active watchdogs and their state.
session_bridge_archive	Archive a session (hidden from groupings; history and position preserved).
session_bridge_archived	List the archive set, optionally resolving titles.

All tools return lossless JSON; wait-style tools never throw on timeout — they return a timedOut / aborted / stale flag.

Project layout

src/
  index.ts    host plugin entry (registers the tools; mounts the monitor)
  core.ts     shared host logic (create/send/wait/read/find, status snapshot, archive attach)
  tools.ts    tool registrations (bridge + status/cancel + monitor + archive)
  monitor.ts  the background watchdog loop (statusSnapshot + rules + optional LLM judge)
  registry.ts bridge-side title/workspace registry (~/.dsh/session-bridge-registry.json)
scripts/
  build.sh    compatibility wrapper for npm run build
  test-bridge-core.mjs  wait/stall regression tests (npm test)

Lifecycle and unloading

DSH ≥ 0.1.6 mounts and unloads plugins at runtime (Settings → Plugins, and the injector's hot reload). This plugin unloads cleanly: it registers no loader-level state, its tools are disposed with the plugin fiber, and the monitor's timer is released through ctx.effect on unload.

One consequence of that ownership model: sessions created by session_bridge_create are owned by the plugin fiber (the agent is created under the plugin's context), so unloading or reloading the plugin stops their live agents. The sessions themselves are persisted and show as offline; bring one back with session_bridge_resume. Monitor watchdogs also stop on unload.

License

MIT