SandBase Harness v0.3.2: local agent runtime and containerized MCP bridge

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SandBase Harness v0.3.2 is an immutable release of the local-first, CMA-compatible agent runtime. It provides durable sessions, sandboxed tool execution, resumable event streams, audit/replay, a local Console, and a native DeepSeek Harness bridge over stdio MCP.

Containerized MCP quick start

The release adds Dockerfile.mcp for reproducible local and self-hosted MCP deployments:

git clone --branch v0.3.2 --depth 1 https://github.com/sandbaseai/sandbase-harness.git
cd sandbase-harness
docker build -f Dockerfile.mcp -t sandbase-harness-mcp:v0.3.2 .

No npm publication or unrelated package is required. The unscoped npm package managed-agents is not this project.

Source quick start

git clone --branch v0.3.2 --depth 1 https://github.com/sandbaseai/sandbase-harness.git
cd sandbase-harness
npm ci
npm run build
mkdir ../my-agents && cd ../my-agents
node ../sandbase-harness/dist/index.js init
node ../sandbase-harness/dist/index.js start

Open http://127.0.0.1:3000/dashboard, then configure a model under Settings > Models.

DeepSeek Harness integration

The bundled stdio bridge exposes agents, sessions, streamed turns, artifacts, and cancellation through native mcp__sandbase__* tools. DeepSeek V4 reasoning controls are documented in the tagged release:

• Integration: https://github.com/sandbaseai/sandbase-harness/tree/v0.3.2/examples/deepseek-harness
• DeepSeek V4 guide: https://github.com/sandbaseai/sandbase-harness/blob/v0.3.2/docs/deepseek-v4.md
• Release: https://github.com/sandbaseai/sandbase-harness/releases/tag/v0.3.2

Verified release gate

The v0.3.2 tag passed typechecking, tests, runtime and Console production builds, package validation, and release smoke checks. The tag target is 2bb788d9ec847d5af8996c6f682a33f9f0734b73.

Please use this discussion for reproducible installation results, compatibility reports, and examples of what you build. If the runtime saves you time, a GitHub star helps other agent-runtime builders discover it.

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v0.3.1 is now available: https://github.com/sandbaseai/sandbase-harness/releases/tag/v0.3.1

This is a documentation and distribution-safety release. It replaces the old unscoped npm quick start with a pinned tagged-source install, adds the canonical Apache-2.0 license recognized by GitHub, and includes the new Handbook, CLI, Discussions, and discovery paths.

Important: the unscoped managed-agents package on npm is unrelated to SandBase Harness. Use the v0.3.1 tagged-source commands in the release notes.

Verification: source and test typechecks passed, 76 test files / 572 tests passed (2 files and 15 tests skipped), runtime and console builds passed, package dry-run passed, and release smoke passed.

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Update: v0.3.2 — containerized MCP bridge

SandBase Harness v0.3.2 adds a minimal Dockerfile.mcp for running the six-tool stdio MCP bridge in a reproducible container. All tagged quickstarts, deployment docs, and examples now resolve to the same immutable release.

git clone --branch v0.3.2 --depth 1 https://github.com/sandbaseai/sandbase-harness.git
cd sandbase-harness
docker build -f Dockerfile.mcp -t sandbase-harness-mcp:0.3.2 .
docker run --rm -i -e MANAGED_AGENTS_URL=http://host.docker.internal:3000 sandbase-harness-mcp:0.3.2

The tag was verified against merge commit 2bb788d9ec847d5af8996c6f682a33f9f0734b73: it contains Dockerfile.mcp, reports package version 0.3.2, and passed the repository typecheck, test, build, package, and release-smoke gates.

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New: pair the DSH plugin with a portable research Skill

The Harness documentation now includes a tested companion workflow for the same DeepSeek Harness project:

npx --yes github:sandbaseai/sandbase-skills add multi-source-search
dsh web

The MCP plugin supplies managed-agent operations, while the Skill supplies a source-verifiable research workflow through DSH's project-scoped .dsh/skills discovery path. The Skill works with host-provided search/page-reading tools and does not require a SandBase account.

Implementation and full CI evidence: #37