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Give DeepSeek Harness a Knowledge Base and Database

@busabase/dsh-plugin connects DeepSeek Harness to Busabase, so an Agent can read trusted knowledge, work with structured data, and submit every proposed write for human review.

It gives the Agent durable context beyond one chat without giving it permission to silently rewrite your source of truth.

See it in action

Watch DeepSeek Harness use the plugin to create a CRM AirApp, submit changes for review, and open the result in Busabase.

Quick start

Requirements

• A current DeepSeek Harness release compatible with this package's peer dependencies;
• Node.js >=24.18.0;
• pnpm available on PATH.

Local Busabase does not need to be running before installation. In Local mode, the plugin starts busabase@latest on demand or reuses a healthy Busabase Personal Desktop or local server. Cloud mode connects to the hosted service through browser OAuth.

1. Install the plugin

npx @deepseek-ai/dsh plugin --profile web add @busabase/dsh-plugin

The package activates both the Host and Web sides automatically. Its reviewed Skills are already included in the npm package, so installation does not need lifecycle-script approval. For installation verification, updates, removal, and notes about older releases, see Install and manage the npm bundle.

2. Choose Local or Cloud

• Local is the zero-configuration default. Use it for on-device data, an account-free setup, or Busabase Personal Desktop.
• Cloud is for an existing Busabase account, team workspaces, and access across devices. Add this item to $DSH_HOME/profiles/web/cordis.patch.yml (~/.dsh/profiles/web/cordis.patch.yml by default):

- id: busabase
  config:
    baseUrl: https://busabase.com
    serverName: busabase

Append the item if the file already has other rows. Do not put credentials in the file; DeepSeek Harness stores the OAuth grant in its credential store after browser sign-in. See the complete Local and Cloud setup guide for updating, verification, switching modes, and troubleshooting.

3. Start DeepSeek Harness

npx @deepseek-ai/dsh --profile web

If dsh is installed globally, you can use dsh instead of npx @deepseek-ai/dsh. Open http://127.0.0.1:3080/. Local mode waits until Busabase is needed. Cloud mode opens the browser for OAuth on the first start, then reuses the stored grant later.

4. Try a first task

Create a customer follow-up Base with company, contact, stage, expected deal size,
owner, next action, and follow-up date. Submit the structure for my review.

In Local mode, call busabase_start first if the full MCP tool catalog is not visible. In Cloud mode, complete browser authorization before submitting the task. The Agent checks the existing workspace first and proposes the Base as a ChangeRequest. You inspect the diff and decide whether to approve and merge it; Cloud proposals are reviewed through their canonical Busabase links.

Why use it

Chat context is useful for the current task, but it is a poor long-term data system. Important conclusions become hard to reuse, business objects lack structure, and an Agent mistake can pollute a document or database before anyone notices.

This plugin adds four things to DeepSeek Harness:

• Trusted knowledge: search approved Docs, Files, Bases, Records, comments, and related objects;
• Structured work: turn natural-language requests into proposed Bases, Forms, AirApps, and records;
• Useful results: render Busabase entities as conversation cards with a live Inspector instead of raw JSON;
• Human control: keep Agent writes at changeRequest permission and, by default, require a fresh confirmation for review actions.

DeepSeek Harness understands the task and calls tools
                ↓
@busabase/dsh-plugin connects the Agent to Busabase
                ↓
Busabase stores approved knowledge and structured data

Common workflows

• Team knowledge: answer questions from approved product docs, meeting decisions, research, and FAQs with locatable sources.
• Research synthesis: extract evidence, themes, and priorities from interviews, then review the proposed records before merging.
• Business databases: describe a CRM, project tracker, inventory, recruiting pipeline, or operations ledger in natural language.
• Content operations: prepare reviewable articles, social posts, newsletters, SEO pages, and localization records.
• Data cleanup: propose deduplication, tagging, enrichment, classification, matching, or translation in batches.
• Workspace apps: build Forms and AirApps around canonical Busabase data and preview them inside the Inspector.

For example:

Look up the latest enterprise data-retention policy in our knowledge base.
Give me the source document and propose updates for any conflicting FAQ records.

The Agent can read the approved policy and prepare corrections, but it cannot approve its own changes.

Propose-only by design

An agent with direct write access
Agent ──writes directly──► official data
                           the mistake is already live

This plugin (capped at `changeRequest`)
Agent ──proposes──► ChangeRequest ──human review──► canonical data
                    the mistake is still a proposal

Busabase itself decides this per credential: a write merges on the spot when the caller has write access, and waits for review when it does not. This plugin deliberately gives the model the lower level.

The MCP connection is capped at changeRequest. Busabase rejects Agent attempts to approve, reject, close, or merge, including proposals that request autoMerge: true. Inspector review actions require a new, explicit user confirmation by default, and stored workspace content is treated as data rather than instructions. Confirmation prompts can be disabled in advanced configuration, but doing so does not raise the Agent's server-enforced permission.

Configuration

The defaults connect to Busabase at http://localhost:15419, start or reuse a loopback service on demand, enable live Inspector refresh, and require confirmation for review actions.

To use another address, adjust plugin load order, or tune server and refresh behavior, see the full configuration reference.

Connecting to Busabase Cloud

Override the Bundle row by id and point baseUrl at an https:// Busabase Cloud address (a root-host deployment, optionally with spaceId, or a workspace subdomain) to connect there instead of a local server:

- id: busabase
  config:
    baseUrl: https://busabase.com
    serverName: busabase

The plugin never manages or starts a remote server. When the remote plugin loads for the first time, it opens your OS browser for a standard OAuth sign-in; DeepSeek Harness stores the resulting token through its credential store, not in this configuration. The MCP connection still sends a fixed changeRequest permission ceiling. In this release the Inspector's review, merge, live refresh, and embedded Base/AirApp previews stay local-only: use the canonical Busabase Cloud link the Inspector shows to inspect, review, and merge remotely.

Cloud ChangeRequest previews use the existing Sidebar Browser on a compatible DeepSeek Harness Desktop host (protocol v1, native browser capability, workspace service, and the official registered browser provider). Automatic previews, card clicks, and recognized Cloud preview links share this optional handoff; no official sidebar plugin is installed by Busabase. Successful navigation leaves Browser selected. Web, unavailable providers, and failed dispatches keep the Inspector's sandboxed iframe; a deliberate card or link click can retry a failed native dispatch. A successful handoff means the host accepted navigation, not that the guest page loaded.

When the optional sidebarRight and sidebarRightTabs services are available, Busabase contributes a busabase-inspector tab definition and a keyed sidebar.right.pane.tab body. It does not replace the single root rightbar, so the official Sidebar and Browser remain mounted. Inspector is recoverable from the sidebar guide, and its Close control closes only its own tab. Its body hides a selection belonging to a different session. Inspector navigation carries no preview URL or bearer token in tab parameters. Hosts missing these services retain the legacy root Inspector fallback.

The sidebar coexistence regression tests mount the real SlotRuntime and official SidebarRight/SidebarBrowser registrations. Their native-path test uses a fake Desktop bridge and asserts a mounted webview shell; it does not prove Electron guest navigation, authenticated Cloud content, or true Desktop acceptance. The test-only DockKit and primitives dependencies are explicitly declared, with DockKit transformed by Vitest. A plugin-scoped Shiki 4 override satisfies the rc.2 primitives API while preserving the workspace default.

Local token persistence: the official Sidebar Browser stores its full current URL, including any preview bearer token, in the local dsh.sidebar-browser.v1.<session> checkpoint. Closing the browser tab removes that checkpoint; hiding it, switching sessions, or unloading this plugin does not. This integration accepts that host-owned local persistence. The adapter deduplicates by session, Space, and ChangeRequest, never by URL or token, and never logs preview URLs.

Use Reopen, a card click, or Reload preview for a deliberate retry after closing a tab or a failed handoff. Native browser Reload retries the existing URL; an expired token requires a fresh authorized preview request (click the original ChangeRequest card again when its tool result has no preview URL). Failed preview fetches are not retried automatically. Review and merge remain in Busabase Cloud.

Current boundaries

• The default setup targets a single local Busabase workspace;
• A non-loopback baseUrl is treated as an external service in auto mode and is never started by the plugin;
• Connecting to a non-loopback https:// baseUrl uses browser-based OAuth instead of the local relay, and keeps Inspector review, merge, and live refresh local-only;
• The full MCP tool set becomes available after busabase_start starts the service and reconnects (local mode only);
• The Agent can propose changes but cannot perform final review or merge;
• Base and AirApp previews require compatible same-origin and embed-origin settings;
• Disabling an iframe keeps entity metadata and the "Open in Busabase" entry available.

Documentation

• Developer Guide: source setup, architecture, configuration, security internals, build, packaging, and E2E tests;
• Busabase website;
• Busabase open-source repository;
• Busabase Skills and MCP integration;
• DeepSeek Harness.