Open-source harness engineering toolkit for AI coding agents
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.
| Package | Version | Description |
|---|---|---|
@dtoolkit/core |
npm | Shared types and Zod schemas (Adapter, ContextBlock, Fact, Entity, Tier) |
@dtoolkit/sdk |
npm | Typed HTTP clients for dtoolkit services (dbrain + dops + dproxy + dwork) |
@dtoolkit/adapter-claude |
npm | Adapter for Claude Code CLI |
@dtoolkit/adapter-codex |
npm | Adapter for Codex CLI |
@dtoolkit/adapter-gemini |
npm | Adapter for Gemini CLI |
@dtoolkit/adapter-opencode |
npm | Adapter for OpenCode CLI |
@dtoolkit/codegraph-sdk |
npm | Code intelligence SDK — fork of codegraph |
| Package | Version | Description |
|---|---|---|
@dtoolkit/dbrain |
npm | Persistent memory server — SQLite + FTS5, MCP, REST API, federation, dashboard |
@dtoolkit/dcontext |
npm | Hooks for AI coding CLIs — injects dbrain context at session start, saves transcripts pre-compaction |
| Package | Version | Description |
|---|---|---|
@dtoolkit/dwork |
npm | AI-native project manager — Markdown as source of truth, kanban dashboard, MCP, REST API |
| Package | Version | Description |
|---|---|---|
@dtoolkit/dproxy |
npm | Universal adapter for invoking models — CLI and REST API |
| Package | Version | Description |
|---|---|---|
@dtoolkit/dops |
npm | Agent observability — tokens, cost, tools, success rate, errors |
| Package | Description |
|---|---|
@dtoolkit/dcouncil |
Multi-agent debate for architecture decisions |
@dtoolkit/dguard |
Pre-commit for agents — validate LLM output before applying |
@dtoolkit/dpolicy |
Policy-as-code for the team harness |
@dtoolkit/droute |
Model router (Haiku/Sonnet/Opus) + cost tracking |
@dtoolkit/dpair |
Real-time pair-programming with a shared agent |
@dtoolkit/dreplay |
Session browser for the team (privacy-aware) |
@dtoolkit/dstream |
Daily digest — what each agent learned, decided, or blocked today |
@dtoolkit/dforge |
Internal marketplace for skills, hooks, and slash commands |
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
Design principle: one layer, one responsibility. If two products need to sync to function, it's wrong.
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 |
dops.ts |
DOpsClient |
Sessions, token usage, tool calls, events, errors, analytics |
dproxy.ts |
DProxyClient |
Batch ask, streaming, system prompts, file attachments, history, memory |
dwork.ts |
DWorkClient |
Projects, tasks, docs, search, overview |
demo.ts |
All SDK clients | 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.
# 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
Contributions are welcome! Here's how you can help:
- Report bugs — open an issue with steps to reproduce
- Suggest features — open an issue describing the use case and expected behavior
- Send a PR — fork the repo, create a branch, make your changes, and open a pull request
This is a pnpm workspace monorepo using Turborepo for task orchestration and Changesets for versioning.
git clone https://github.com/ivncmp/dtoolkit.git
cd dtoolkit
pnpm install
pnpm build- Create a feature branch from
main - Make your changes and ensure they pass checks:
pnpm lint && pnpm format:check && pnpm test - Add a changeset describing your change:
pnpm changeset - Push and open a PR against
main
CI runs lint, tests, and build automatically. When a PR with changesets is merged, the release workflow creates a version PR — merging that publishes to npm.
@dtoolkit/codegraph-sdkis a library-only fork of codegraph by Colby McHenry.