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dsh-acp-enhanced

An enhanced Agent Client Protocol (ACP) server for DeepSeek Harness (dsh), built for ACP editors like Zed. It is a drop-in replacement for the official @deepseek-ai/dsh-acp bridge: the official bridge only streams plain text, this one exposes the Web GUI's capabilities — streaming, telemetry, model/permission control, session management, MCP — over the ACP wire.

Features

Output & telemetry

• Block + reasoning streaming: text blocks and the model's thinking arrive live (agent_message_chunk / agent_thought_chunk); cancelled/retried attempts never leak torn output. Set streamDeltas: true on the acp-enhanced row for token-level streaming instead — the reply renders while the model writes it, coalesced on a 75 ms timer; the trade-off is that a mid-block retry can no longer hide its abandoned partial text, so a visible _[stream interrupted — retrying]_ marker separates the seam (off by default)
• Full telemetry: context usage ring plus cache hit rate / TPS / input-output-reasoning tokens / tool timing / turn counts (usage_update._meta carries the full breakdown)
• Image support (multimodal): when the dsh composition mounts an attachment store (dsh-attachment-local, mounted by default in dsh-base), promptCapabilities.image is advertised and pasted/uploaded images are ingested into the harness's durable attachment store — a vision-capable model (e.g. deepseek-v4-flash-vision-exp) reads them natively, in wire order with surrounding text. Older stacks (no attachment store) automatically downgrade: image is not advertised and an image prompt is refused with a clear error.

Model & permissions

• Model switching: live provider/model catalog dropdown (ACP grouped-select wire shape)
• Reasoning effort: reasoning_effort dropdown — only when the routed model exposes selectable efforts; each model remembers the effort it last used (persisted per profile), so switching back restores it, and a first-time model falls back to its own default — or its first offered effort — instead of an empty "unknown" selection
• Permission presets: read-only / workspace-write / full-access session modes
• Approval: native allow-once / reject-once prompts per tool call
• Agent presets: per-session model-facing composition (tools + prompt sections) from the dsh agent-presets roster. standard is the full coding agent (default), minimal (极简模式) is a bare shell + files editor with no subagent/web/todo/plan tools — nothing from the host layer leaks into a minimal agent; code and cordis ship alongside, and your own presets under ~/.dsh/.agent-presets appear too. Choose via the agent_preset config option, the /preset command, or the DSH_ACP_PRESET env var (per-session default); switching is only allowed while the session is still blank (no turn has run), so history never straddles two tool sets.

Zed deep integration

• Tool cards: one-line summary in the collapsed header — Read <path>, the model's own intent line for shell commands (description, Codex-style — the exact command stays one click away), Search: <pattern>, Fetch: <url>, etc. The card body follows the ACP best practice: file edits render as a real diff, bash/pwsh commands as a real terminal card (codex-acp wire shape: command line + output + exit pill inside a terminal panel — no more raw-JSON cards), other executors as a syntax-highlighted code block, and touched files as clickable locations that open the file — with rawInput / rawOutput kept one click away for transparency, plus per-kind icons and a proper in-progress → completed/failed status lifecycle
• Zed files & terminal: zed_read_text_file / zed_write_text_file / zed_terminal put file edits into Zed's "edited files" area (diff + accept/reject) and commands into a real Zed terminal
• Native form questions: ask_user_question → elicitation/create form, click an option — or type a custom answer when none of them fit: options render with their descriptions, each option-backed question gets a free-text "Custom answer" field, and a custom answer replaces the single selection / accompanies a multi-select (same semantics as dsh's native question card)
• Plan panel: plan mode toggle → "planning" status bar in Zed

Sessions

• Resume & archive: session/load restores past threads (full replay); session/list lists the thread archive (titled, sorted by last activity); session/close drops the in-memory record so a later session/load resumes from the persisted log; live title updates. session/delete is deliberately not advertised — the harness declares no public persistence delete (see Compatibility)
• Multi-root workspaces: sessionCapabilities.additionalDirectories is advertised, so Zed no longer shows "this agent doesn't currently support multi-root workspaces" and instead passes every workspace root on session/new / session/load. All roots are described to the model in the system prompt and reported on session/list; the sandbox keeps the primary cwd as its single writable root (see Known limitations)

Commands

• Slash commands: typing / reveals the command list (available_commands_update): /status shows the route and telemetry, /model lists or switches the model, /preset lists or switches the agent preset (listings render as monospace code blocks — readable at a glance), everything else (/compact /goal /permission /plan…) runs straight through the harness command registry — all executed without a model turn. Every user-invocable skill is advertised as a command too, so /ask-matt, /code-review, /tdd, … reach the bridge instead of being rejected by the editor, and the skill's instructions are injected into the message (dsh-tool-skill-style user invocation). Images pasted next to a slash line ride along as command attachments (e.g. reference screenshots for a /goal objective), the same way the Web composer submits them

MCP

• MCP servers: session/new mcpServers mount any MCP server (stdio + streamable HTTP); tools join as mcp__<server>__<tool>; a failing server never takes the session down

Preview

After picking dsh-acp-enhanced in Zed's AI Agent panel:

Quick start

Requires dsh ≥ 0.1.5-rc.2 (npm install -g @deepseek-ai/dsh@0.1.5-rc.2); the bridge targets one declared harness API line and does not probe older generations at runtime.

This package follows the official dsh plugin conventions (it declares dsh.bundle), so installation matches any official bundle: one command — auto-initializes the profile, installs the package, appends the bundle layer; no profile YAML to write.

Install (2 steps)

Step 1 — install (from the npm registry; no source checkout needed):

dsh plugin --profile acp-enhanced add dsh-acp-enhanced

When hacking on the code, use link: to a local checkout instead (live edits): dsh plugin --profile acp-enhanced add "link:/absolute/path/to/dsh-acp-enhanced"

Step 2 — register in Zed (under agent_servers in ~/.config/zed/settings.json; Zed spawns agents with a minimal PATH, so use the shipped launcher scripts/dsh-acp-zed.sh, which locates node/dsh itself)

The launcher ships with the package. Its absolute path depends on how you installed in Step 1:

• npm install (default): $HOME/.dsh/profiles/acp-enhanced/node_modules/dsh-acp-enhanced/scripts/dsh-acp-zed.sh — replace $HOME with your home directory (e.g. /Users/you); Zed does not expand ~ or env vars, so write the full literal path.
• link: dev install: <your checkout>/scripts/dsh-acp-zed.sh.

Most common: DeepSeek official API (the default route)

{
  // ...your existing settings...
  "agent_servers": {
    "dsh-acp-enhanced": {
      "type": "custom",
      "command": "/bin/bash",
      "args": ["/absolute/path/to/dsh-acp-enhanced/scripts/dsh-acp-zed.sh"],
      "env": {
        "DSH_ACP_PROVIDER": "deepseek-official",  // the official provider id
        "DSH_ACP_MODEL": "deepseek-v4-flash",     // the official model id
        "DSH_ACP_PRESET": "standard"              // optional: agent preset id (minimal / standard / code / cordis / yours)
      }
    }
  }
}

Both env vars match the shipped patch's defaults, so they can be omitted entirely — writing them out just makes the route explicit. DSH_ACP_PRESET defaults to standard on the roster side; set it when you want every new session to start in a specific mode. The API key does not have to live in Zed: store it in ~/.dsh/.credentials.yaml (DEEPSEEK_API_KEY) and the dsh credentials service resolves it; the launcher also falls back to a running dsh web process's key.

Debugging a stalled turn (is it the model request or the tool?):

"env": {
  // ...existing vars...
  "ACP_LOG": "/Users/you/.dsh/dsh-acp-enhanced.trace.jsonl"  // append-only JSONL event trace
}

Each line is one session event with wall-clock time (ms epoch); a turn that appears to hang is attributable afterwards: a model request stall shows a long gap between step/start and the first assistant/chunk, while a tool-execution stall shows a long gap between tool/call and tool/result (the result line carries elapsedMs). prompt/settled lines cover the full user-message round trip (stopReason + elapsed).

Optional: pin the panel's default config options (all still changeable in the panel):

"dsh-acp-enhanced": {
  // ...the type/command/args/env above...
  "default_config_options": {
    "model": "deepseek-official/deepseek-v4-flash",
    "agent_preset": "standard",
    "plan_mode": false,
    "reasoning_effort": "high"
  },
  "favorite_config_option_values": {
    "model": ["deepseek-official/deepseek-v4-flash", "deepseek-official/deepseek-v4-pro"]
  }
}

Extended: route through an OpenAI-Responses gateway (e.g. a company model gateway)

Same install path; only the env values change to the provider/model the gateway exposes plus the key env var it requires:

"dsh-acp-enhanced": {
  "type": "custom",
  "command": "/bin/bash",
  "args": ["/absolute/path/to/dsh-acp-enhanced/scripts/dsh-acp-zed.sh"],
  "env": {
    "DSH_ACP_PROVIDER": "<gateway-provider-id>",  // provider id exposed by the gateway
    "DSH_ACP_MODEL": "<gateway-model-id>",         // model id exposed by the gateway
    "<KEY_ENV_NAME>": "<key>"                      // the key env var the gateway reads
  }
}

<KEY_ENV_NAME> can also be omitted and the key stored in ~/.dsh/.credentials.yaml instead.

Zed hot-reloads settings. Open the AI Agent panel (Cmd+Shift+A) → pick dsh-acp-enhanced in the agent selector → send your first message: replies stream in real time, the status bar shows context usage, the panel exposes Model / Permission preset / Plan mode options plus three modes, and the thread archive lists and resumes past sessions.

Verify locally (no Zed needed):

node <pkg>/scripts/acp-doctor.mjs              # bundles + versions, the peer range, and one real boot
node scripts/acp-client.mjs                    # dev checkout only: full ACP e2e, expect ALL CHECKS PASSED
DSH_ACP_PROVIDER=... DSH_ACP_MODEL=... node scripts/acp-client.mjs   # only for a custom route

Web search

The bridge ships no search provider and takes no position on which one you use: the model-facing web_search tool rides on the web seam's searchProvider, so mount any ctx.web provider into the profile — a package with dsh.bundle via dsh plugin --profile acp-enhanced add <package>, or a plain package via your user-layer insert rows (see below). Which provider exists in your dsh deployment is a profile concern, not a bridge one.

Note what that costs: a provider bundle sits on the boot path of every ACP thread, so if it fails to load, the whole profile dies and Zed shows an opaque hang. Prefer a preset composition when the plugin only adds model-facing tools (see Keep the profile minimal); a provider that must configure the host web row belongs in the host composition (the profile) — mount it deliberately, and re-run the doctor after changing it.

Managing the profile's plugins

dsh-acp-enhanced runs in its own profile — acp-enhanced, created at ~/.dsh/profiles/acp-enhanced/ — inside the same dsh home as dsh web. The profile is what isolates the composition, so plugin changes here never affect your web setup, while credentials, settings, sessions and presets stay shared.

The profile composes its plugin tree from three sources, each layer patching the ones before it:

1. Bundle layers — dsh.profile.bundles in the profile's package.json: the template's @deepseek-ai/dsh-base first, then every installed package that declares dsh.bundle (like dsh-acp-enhanced), in array order.
2. Your user layer — ~/.dsh/profiles/acp-enhanced/cordis.patch.yml: id-targeted row config overrides, disabled: true row disables, and insert lists (how a package without dsh.bundle — e.g. a hand-mounted custom provider — gets mounted).
3. Per-run overlays — dsh --profile acp-enhanced --patch extra.yml.

Adjust the set with:

dsh plugin --profile acp-enhanced add <package>     # install; a dsh.bundle package auto-joins the layer stack
dsh plugin --profile acp-enhanced remove <package>  # uninstall; auto-leaves the stack
dsh plugin --profile acp-enhanced update [package]  # update one/all, then reconcile
dsh --profile acp-enhanced --dump-config             # inspect the composed tree (per-layer provenance)

dsh plugin is a thin pnpm forwarder (run inside the profile directory) that reconciles dsh.profile.bundles against the installed state after every run. Two consequences worth knowing:

• Disabling a bundle by deleting it from bundles does not stick — the package is still an installed dependency, and the next dsh plugin run appends it right back. To disable a single row without uninstalling, target it in the user layer by its row id (not the package name — find ids in the --dump-config output):

  - id: mnemon
    disabled: true
  

• A package without dsh.bundle loads nothing by itself — it installs as a plain dependency (with a one-time warning) and needs your own insert entry in the user layer. To change an existing row's config, override it with - id: <row> + config: — patch entries replace the whole row config, they do not merge.

Changes take effect in the next process: Zed spawns a fresh dsh --profile acp-enhanced for every agent thread, so open a new agent thread (or restart Zed) after editing the profile.

Keep the profile minimal

The profile is a single failure domain. cordis-plugin-loader awaits every entry and rethrows the first rejection, so one unloadable row aborts the whole plugin tree: the process may even answer the ACP initialize handshake first and die right after, which a client reports as an opaque hang, not an error.

Keep dsh.profile.bundles at exactly the two rows that cannot mismatch their own boot:

"bundles": ["@deepseek-ai/dsh-base", "dsh-acp-enhanced"]

@deepseek-ai/dsh-base ships with the CLI, so its version always matches the CLI that boots it; every other bundle is a third party whose dependency closure can drift. Mount extra plugins where a failure costs one preset instead of the whole editor session:

• Plugin adds only model-facing tools/commands → declare its row in a preset composition. User presets live in $DSH_HOME/.agent-presets/<id>/ (agent.cordis.yml for the composition, preset.yml for the picker label); the roster discovers them automatically and the ACP agent_preset dropdown lists them. A preset whose composition fails to load is reported as broken and simply not offered, instead of killing the process.
• Plugin must configure a host service (e.g. a search provider overriding the host web row's searchProvider) → it belongs in the host composition, i.e. the profile. That is a deliberate trade: accept the boot-path risk, and re-run the doctor after any change.

Check the result before trusting it:

node <pkg>/scripts/acp-doctor.mjs          # bundles + versions, the peer range, and one real boot
dsh --profile acp-enhanced --dump-config   # where each row comes from

Compatibility

One bridge binary, one harness API line: dsh ≥ 0.1.5-rc.2 (peer range ^0.1.5-rc.2 || ^0.1.6-alpha.1). Both lines in that range are boot-verified — handshake, profile settle and a real session/new — on every CI run, plus a cross-generation link check. The bridge consumes only the harness's declared surface: services in docs/capability-seams.md, events in docs/event-producer-consumer.md, published package exports. scripts/api-surface-check.mjs fails on anything else (a blocking CI step), and there is no runtime generation probing left — no version flags, no duck-typed service shapes.

Support policy

Bridge	Supported dsh lines	What changed
0.9.x	^0.1.5-rc.2 || ^0.1.6-alpha.1	declared-surface-only rewrite; floor 0.1.5-rc.2; session/delete dropped
0.8.x	^0.1.0-rc.6 … ^0.1.6-alpha.1 (unreleased)	0.1.3+ live-stream seam; 0.1.5 persistence handle API
0.7.x and older	≤ 0.1.2-rc.1	runtime probing of both generations

The rules behind that table:

• A new dsh API line gets a new bridge release, not a wider runtime probe. Probing is how 0.7.x absorbed 0.1.1 → 0.1.5, and it is why that support rotted silently.
• The floor moves only with a bridge minor, and never silently: the launcher warns before booting a CLI below the range, and the doctor stops with RESULT FAIL — CLI too old.
• A line is dropped by publishing a bridge that says so; the previous line stays on the feat/dsh-0.1.3-plus-support branch for users who cannot move.
• Watch the next line before it is released: the scheduled canary workflow installs the alpha dist-tag and runs the guard, the link check and a boot smoke, so a breaking change shows up as a red canary rather than as user breakage.

What 0.9.0 changed (breaking)

Change	Effect	If it bites
floor raised to dsh ≥ 0.1.5-rc.2	older hosts fail at mount time with a named error instead of degrading silently	upgrade the CLI (npm install -g @deepseek-ai/dsh@0.1.5-rc.2), or stay on the feat/dsh-0.1.3-plus-support branch for ≤ 0.1.2-rc.1
session/delete removed	the ACP capability is no longer advertised and persisted sessions are never deleted — the harness declares no public persistence delete	the files stay under $DSH_HOME/sessions/<slug>/<id>/; remove them by hand if you must. An upstream issue tracks a public delete API
the launcher no longer rewrites DSH_HOME	the ACP profile boots inside the home the launcher was started with (${DSH_HOME:-$HOME/.dsh}), sharing credentials, settings, sessions and presets with dsh web	used the old implicit ~/.dsh-acp? Point the launcher at it explicitly ("DSH_HOME": "<home>/.dsh-acp" in Zed's agent_servers.env) or migrate back to the shared home
the assistant/chunk seam is gone	live streaming is agent/assistant-stream only (the floor carries it)	upgrade the CLI; a host that streams nothing is still covered by the committed assistant/message fallback

Upgrading from a published ≤ 0.7.0

The published latest is 0.7.0, from the pre-0.1.3 API line, so the bridge and the CLI have to move together — in either order the half-upgraded pair is broken:

Order	What you get
CLI first, bridge left at 0.7.0	The profile boots and initialize succeeds, but every session/new fails with an Internal error (tool-subagent: modelSelectionSettings requires … in the Host scope). Nothing can warn you: that bridge copy is already installed, and it also has no agent/assistant-stream seam and no assistant/message fallback, so replies would not render either
Bridge first, CLI left behind	The profile dies while loading (… subpath './model-selection-settings' is not defined by "exports"). The launcher warns on stderr before that, and scripts/acp-doctor.mjs stops with RESULT FAIL — CLI too old
Both together	The supported state

Checklist:

1. npm install -g @deepseek-ai/dsh@0.1.5-rc.2 (or any version in the peer range above).
2. dsh plugin --profile acp-enhanced add dsh-acp-enhanced@0.9.0. Upgrading the bridge is explicit: the profile's dependency is a caret on 0.x, so dsh plugin update will not move you to a new minor by itself.
3. Booted the profile from a checkout, or set DSH_PATH before? The old launcher moved you to ~/.dsh-acp on its own; it does not any more. Set DSH_HOME=<that home> in Zed's agent_servers.env, or recreate the profile in your default home. The launcher says so if it finds a profile there.
4. Followed the old README and seeded subagent-model-selection-settings in your profile's user layer? Delete the row: the bridge's patch ships it now, and a duplicate id aborts the boot. scripts/init-acp-home.sh retires it for you. The launcher warns, and the doctor names the id.
5. Check that any third-party bundle in the profile supports 0.1.5 (dsh-free-search ≥ 0.4.24 is verified) — the profile is one failure domain.
6. Restart Zed (or open a fresh agent thread); node <pkg>/scripts/acp-doctor.mjs verifies the whole path first, including opening a thread.

One CLI generation per home

$DSH_HOME/profiles/node_modules is a single dependency closure shared by every profile under that home, and dsh heals it to whichever CLI booted last. So:

This is 0.1.5-line behaviour. On 0.1.6-alpha.2 that shared closure no longer exists at all (the harness resolves from the CLI's own install; the profile's node_modules holds only out-of-tree plugins), which is why the launcher's drift check is line-specific and silently no-ops where the path is gone.

• Never run two CLI generations under one home at once. The second boot flips the closure under the first process, which then lazily resolves mismatched modules mid-flight. The launcher compares the closure's dsh-agent version with the CLI it is about to boot and warns on stderr when they differ — after such a boot, restart the other dsh processes under that home (dsh web, …).
• The escape hatch is the CLI, not the home. Pin the launcher with DSH_PATH=<dsh> (or use the repo pin below): the launcher resolves which dsh, never which home.

Current resolutions are always visible:

node scripts/compat-check.mjs   # dev checkout: installs the 0.1.5-rc.2 and 0.1.6-alpha.2 sets and imports the bridge from each
node <pkg>/scripts/acp-doctor.mjs   # CLI + closure versions, bundles, and one real boot (shipped)

Dev checkout: repo-pinned CLI, shared home

When the launcher runs from a checkout (link: install), it resolves the dsh CLI in this order:

1. $DSH_PATH — an explicit dsh binary, or a directory whose node_modules/.bin/dsh holds one
2. the repo-pinned CLI — <repo>/node_modules/.bin/dsh (this package's @deepseek-ai/dsh devDependency, currently 0.1.5-rc.2)
3. global fallback — dsh on PATH / npx cache / npm prefix (a fresh clone without pnpm install degrades to it)

Whichever wins boots profile acp-enhanced in the home the launcher was started with (${DSH_HOME:-$HOME/.dsh}). The home is never rewritten. If you want the bridge on its own dependency closure, build a separate home and point the launcher at it explicitly:

DSH_ACP_HOME=~/.dsh-acp scripts/init-acp-home.sh   # optional, idempotent: creates + seeds an isolated home
# then in Zed's agent_servers env:  "DSH_HOME": "/Users/you/.dsh-acp"

The isolated home is a deliberate opt-in, not a default: your profile must exist in whichever home the launcher boots, or it exits 127 with the exact dsh plugin … add link: command that creates it. init-acp-home.sh ports your old profile's user rows verbatim, copies credentials/settings, disables the DeepSeek plugin-package inventory reporter, and retires a legacy subagent-model-selection-settings row from the user layer — that host row now belongs to the bridge's bundle patch, and a second copy aborts the boot with duplicate loader entry id.

Sessions persist under $DSH_HOME/sessions/<slug>/<id>/session.jsonl.zstd in both homes; nothing is copied between them by default, because the default home's tree also holds every web-profile session. Pass --copy-sessions (or run the rsync the script prints) when migrating an existing setup.

Troubleshooting

Start with the doctor: it boots the profile exactly as Zed does and names the failure layer, the offending bundle and the fix.

node <pkg>/scripts/acp-doctor.mjs              # installed copy
node scripts/acp-doctor.mjs                    # from a checkout (npm run doctor)
node <pkg>/scripts/acp-doctor.mjs --profile <name> --home <dsh-home> --timeout 60000

It prints the CLI + version, the home, the profile, every bundle + version, the supported peer range and the closure version, then classifies the boot into one of three layers:

Layer	Signature in dsh's stderr	What it means	Fix
link-time	does not provide an export named …, SyntaxError: The requested module …	the booting CLI's closure cannot satisfy an import this bridge performs	node <pkg>/scripts/acp-doctor.mjs — if it prints LAYER link-time, align the generation: restart every other dsh process under this home (the shared closure heals to whichever CLI booted last), or pin this launcher with DSH_PATH=<matching dsh>
mount-time	failed to apply loader entry …, … requires … in the Host scope, duplicate loader entry id: …	the loader rejected one entry and rethrew, so the whole plugin tree is down	node <pkg>/scripts/acp-doctor.mjs prints SUBJECT <entry> (<module>) — install the missing module, disable that row (- id: <entry> + disabled: true in the user layer), or trim dsh.profile.bundles to @deepseek-ai/dsh-base + dsh-acp-enhanced. For a duplicate id, delete the row from your user layer (the bundle patch owns it)
run-time	… is not a function after a successful handshake	the bridge reached a harness service this CLI generation does not provide	npm install -g @deepseek-ai/dsh@<version in the supported range> (see Compatibility)

The launcher translates the same three signatures on stderr while Zed boots (stdout is the ACP wire), so the agent log already carries the layer and the fix.

Symptom	Locate	Fix
Zed hangs with no output; the thread never answers	node <pkg>/scripts/acp-doctor.mjs	Prints BOOT FAILED + LAYER/SUBJECT/FIX; follow the FIX line. A profile that answers initialize and dies right after is reported as such
exec: dsh: not found (status 127)	which dsh	Use the shipped dsh-acp-zed.sh launcher (it locates node/dsh itself), or install the CLI
no API key for provider route "xxx"	ls -l $DSH_HOME/.credentials.yaml	Write ~/.dsh/.credentials.yaml, or set env.DEEPSEEK_API_KEY on the agent_servers entry
SyntaxError: … 'PresetMountError'	the bridge version in the agent log	You are running a pre-0.9.0 bridge copy against a 0.1.5 host — update this package
modelSelectionSettings requires … in the Host scope	dsh --profile acp-enhanced --dump-config | grep subagent-model-selection	The host row the standard preset needs is missing — the bridge's bundle patch inserts it, so reinstall/upgrade the bridge (dsh plugin --profile acp-enhanced add dsh-acp-enhanced), and check that nothing in your user layer sets it disabled: true
duplicate loader entry id: <row>	the doctor prints LAYER mount-time and the id	Two layers ship the same row. Delete it from the profile's user layer ($DSH_HOME/profiles/acp-enhanced/cordis.patch.yml) — these host rows belong to the bundle patch. scripts/init-acp-home.sh retires the legacy subagent-model-selection-settings copy for you
Old threads start empty after a host upgrade	ls $DSH_HOME/sessions	The sessions live under $DSH_HOME/sessions/<slug>/; copy the old home's history in (scripts/init-acp-home.sh --copy-sessions) and the new host resumes them
Cannot switch models	ACP_DEBUG=1 dsh --profile acp-enhanced, then try the switch	The carried reasoning_effort is unsupported on the target: the bridge remembers the last effort per model (per-profile JSON) and falls back to the model's default rather than failing the switch. Also check the route is real — phantom providers are filtered, only config.provider's models are advertised
Context usage missing	/status in the thread	A "phantom provider" route was picked; point the profile's provider at a real route
Turn settles with usage but no reply text (empty panel)	ACP_DEBUG=1 and look for agent/assistant-stream frame=chunk	From 0.9.0 the only live seam is the agent/assistant-stream frames event, with the committed assistant/message as the fallback whenever a step streamed nothing. Frames present but no text = a client-side render problem; no frames at all = the fallback path (upgrade the bridge if it is older)
Plugin edits seem ignored	the profile's cordis.patch.yml mtime	Changes apply to the next process: open a new agent thread (or restart Zed)
Need detailed diagnostics	—	ACP_DEBUG=1 (stderr lifecycle trace) and ACP_LOG=/tmp/acp.jsonl (per-event JSONL with timings)

Development

pnpm install                          # install dev dependencies (repo-pinned CLI and test scripts)
node scripts/compat-check.mjs         # link check across the supported lines (0.1.5-rc.2 / 0.1.6-alpha.2 scratch installs)
node scripts/api-surface-check.mjs    # public-surface guard: no undeclared harness API (blocking CI step)
node scripts/pack-check.mjs           # package integrity: entry points, modes, shipped-file references (blocking CI step)
node scripts/acp-client.mjs           # end-to-end smoke (needs an API key)
node scripts/acp-client-tools.mjs     # client-tool tests (mocks Zed fs/terminal/elicitation/plan)
node scripts/acp-mcp-test.mjs         # MCP mount test (no model calls)
node scripts/acp-smoke-keyless.mjs    # keyless boot smoke (CI)
node scripts/acp-resume-test.mjs      # session resume test
node scripts/codec-image-test.mjs     # image-codec unit tests (no network, fake store)
node scripts/terminal-codec-test.mjs   # terminal-card codec unit tests (no network)
node scripts/replay-order-test.mjs     # replay/fallback chunk order: reasoning precedes its reply (no network)
node scripts/acp-image-e2e.mjs        # image capability e2e (vision-model leg needs an API key)
node scripts/acp-message-fallback-test.mjs  # live seam + assistant/message fallback: a seam fired and the reply arrived exactly once
node scripts/acp-launcher-test.mjs     # launcher contract: home never rewritten, drift warning, boot-failure translation
node scripts/acp-doctor.mjs            # boot the profile once and name the failing layer/bundle
scripts/init-acp-home.sh              # optional: bootstrap an *isolated* home (the launcher never switches to it by itself)

DevDependency pins for the harness packages use the same ranges the pinned @deepseek-ai/dsh CLI declares (e.g. ^0.1.5-rc.2), so the repo's tree and a fresh CLI install resolve one coherent family — exact patch pins here mixed with the CLI's range-resolved closure produce a split closure (two versions of one name) that breaks profile boots with export-not-found errors. After changing those pins, regenerate the whole lockfile (rm -rf node_modules pnpm-lock.yaml && pnpm install): an incremental install both leaves stale store entries poisoning the profile heal AND retains stale lockfile peer resolutions — bumping 0.1.2-alpha.2 → 0.1.2-rc.1 in place left dsh-session-persistence@0.1.2-alpha.3 (old-generation peers) wired into the rc.1 packages' snapshots, which passes boot and session/new and only breaks the first turn with TypeError: Cannot read properties of undefined (reading 'length') from PersistenceCoordinator. pnpm-workspace.yaml approves the CLI closure's build scripts (node-pty prebuilds, koffi) — they are runtime requirements when the repo CLI boots the profile.

Known limitations

Audio attachments are not supported (audio capability is not advertised), text streams at block granularity by default (streamDeltas: true opts into token-level streaming, see Features), one in-flight prompt per session. MCP supports stdio and streamable HTTP (legacy SSE / acp transports are not advertised). session/fork / session/resume are not implemented (capabilities undeclared, compliant clients will not call them). session/delete is not advertised either: the harness declares no public persistence delete, so persisted sessions are never removed by the bridge (see Compatibility).

Multi-root workspaces are advertised and all roots are visible to the model, but dsh's sandbox policy resolves one writable root per session (the primary cwd, i.e. session.header.cwd) and the local sandboxes bind exactly that root for writes. Reads work in every root; under workspace-write a write under an additional root is denied first and needs escalation/approval, while danger-full-access writes everywhere. True multi-root write enforcement belongs in dsh core (dsh-sandbox-policy / dsh-sandbox-local would need a root list instead of a single root).

Agent presets take over the model-facing rows: the shipped cordis.patch.yml disables the dsh-base rows a preset owns (tool-bash/fs/subagent/todo/web/… — exactly the official dsh-web-app/tui list minus hmr, kept version-agnostic across generations: a row a given generation does not ship is warned and skipped by the patch applier) and mounts the agent-presets roster (standard default; code/minimal/cordis ship with the dsh CLI, your own preset dirs under ~/.dsh/.agent-presets are picked up automatically). The bundle's own patch applies automatically (package.json dsh.bundle.patch) — do not copy it into the profile's user-layer cordis.patch.yml, or the loader rejects the duplicate entry ids at boot. When upgrading a profile that already carries a customized user-layer patch, keep only your custom row configs there (e.g. includeAllProviders: true on the acp-enhanced row, restating provider/model/preset since patch entries replace whole rows, they do not merge). A session created before the upgrade resumes under the roster's default preset.