dtoolkit

Open-source harness engineering toolkit for AI coding agents

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The frontier isn't the model — it's the harness: loop, context, tools, hooks, memory, observability. dtoolkit is a family of composable products that make your coding agents smarter, faster, and observable.

Each product has one job, works standalone, and composes with the rest via a neutral ContextBlock[] contract. No vendor lock-in — works with Claude Code, OpenCode, Cursor, Codex, and any tool that speaks MCP or CLI.

Packages

Core

Package	Version	Description
@dtoolkit/core		Shared types and Zod schemas (Adapter, ContextBlock, Fact, Entity, Tier)
@dtoolkit/sdk		Typed HTTP clients for dtoolkit services (dbrain + dproxy + dwork)
@dtoolkit/adapter-claude		Adapter for Claude Code CLI
@dtoolkit/adapter-codex		Adapter for Codex CLI
@dtoolkit/adapter-gemini		Adapter for Gemini CLI
@dtoolkit/adapter-opencode		Adapter for OpenCode CLI

Memory & Context

Package	Version	Description
@dtoolkit/dbrain		Persistent memory server — SQLite + FTS5, MCP, REST API, federation, dashboard
@dtoolkit/dcontext		Hooks for AI coding CLIs — injects dbrain context at session start, saves transcripts pre-compaction

Project Management

Package	Version	Description
@dtoolkit/dwork		AI-native project manager — Markdown as source of truth, kanban dashboard, MCP, REST API

Multi-provider Transport

Package	Version	Description
@dtoolkit/dproxy		Universal adapter for invoking models — CLI and REST API

Team Coordination

Package	Version	Description
@dtoolkit/dstream	—	Daily digest — what each agent learned, decided, or blocked today
@dtoolkit/dreplay	—	Session browser for the team (privacy-aware)
@dtoolkit/dpair	—	Real-time pair-programming with a shared agent

Quality & Observability

Package	Version	Description
@dtoolkit/dops	—	Agent observability — tokens, cost, tools, success rate, errors
@dtoolkit/dpolicy	—	Policy-as-code for the team harness
@dtoolkit/dguard	—	Pre-commit for agents — validate LLM output before applying

Distribution & DevEx

Package	Version	Description
@dtoolkit/dforge	—	Internal marketplace for skills, hooks, and slash commands
@dtoolkit/droute	—	Model router (Haiku/Sonnet/Opus) + cost tracking
@dtoolkit/dcouncil	—	Multi-agent debate for architecture decisions

Architecture

graph TB
    subgraph Agent["Your Agent"]
        CC["Claude Code / OpenCode / Gemini / ..."]
    end

    CC -- "ContextBlock[]" --> dcontext
    CC -- "ContextBlock[]" --> dproxy
    CC -- "MCP / REST" --> personal
    CC -- "MCP / REST" --> dwork

    subgraph Harness["dtoolkit harness"]
        dcontext["dcontext<br/><small>hooks + briefing</small>"]
        dproxy["dproxy<br/><small>transport</small>"]
    end

    subgraph Memory["Memory layer"]
        personal["dbrain <small>(personal)</small><br/><small>identity + memory + knowledge</small>"]
        shared["dbrain <small>(shared / team)</small><br/><small>team knowledge + API keys</small>"]
    end

    subgraph Projects["Project management"]
        dwork["dwork<br/><small>tasks + docs + kanban</small>"]
    end

    dcontext -- "search / save" --> personal
    personal -- "federated recall<br/>share facts" --> shared

    subgraph Adapters["Provider adapters"]
        ac["adapter-claude"]
        ax["adapter-codex"]
        ag["adapter-gemini"]
        ao["adapter-opencode"]
    end

    dproxy --> ac & ax & ag & ao

    style Agent fill:#1a1a2e,color:#fff,stroke:#16213e
    style Harness fill:#0f3460,color:#fff,stroke:#16213e
    style Memory fill:#533483,color:#fff,stroke:#16213e
    style Projects fill:#0f3460,color:#fff,stroke:#16213e
    style Adapters fill:#1a1a2e,color:#fff,stroke:#16213e
    style personal fill:#e94560,color:#fff,stroke:#533483
    style shared fill:#7c3aed,color:#fff,stroke:#533483
    style dwork fill:#e94560,color:#fff,stroke:#533483

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Design principle: one layer, one responsibility. If two products need to sync to function, it's wrong.

Examples

The examples/ directory contains ready-to-run TypeScript examples for the @dtoolkit/sdk clients:

Example	Client	What it covers
dbrain.ts	DBrainClient	Health, entity CRUD, facts, search, memory summary, conversations, federation
dproxy.ts	DProxyClient	Batch ask, streaming, system prompts, file attachments, history, memory
dwork.ts	DWorkClient	Projects, tasks, docs, search, overview
demo.ts	All	Combined smoke test

cd examples
npm install
npm start          # init + start servers + run demo + teardown

No configuration needed — the setup script creates a temporary brain, starts dbrain and dproxy, runs the demo, and cleans up. See the examples README for details.

Quick start

# Install dependencies
pnpm install

# Build all packages (dependency-ordered)
pnpm build

# Run tests
pnpm test

# Lint
pnpm lint

Per-package:

pnpm --filter @dtoolkit/dbrain dev      # watch mode
pnpm --filter @dtoolkit/dwork dev       # watch mode
pnpm --filter @dtoolkit/dproxy build    # single build

Contributing

This is a pnpm workspace monorepo using Turborepo for task orchestration and Changesets for versioning.

pnpm changeset       # describe your change
git push             # CI runs lint + test + build
                     # release workflow creates a version PR
                     # merging publishes to npm

License

MIT