sandbaseai/sandbase-harness
C3Open-source CMA-compatible agent runtime for any model, with MCP tools, sandboxed sessions, audit, replay, and a local console. Includes a native DeepSeek Harness bundle over stdio MCP.
★ 500+ · sandbaseai/sandbase-harness source on GitHub · this plugin in the registry
sandbaseai/sandbase-harness is a DeepSeek Harness plugin rated C3 — powerful capability combined with sensitive behavior. It patches the dsh runtime, executes system commands, decodes base64 payloads, starts a network server.
What it can do
| Capability | Flag | Evidence |
|---|---|---|
| patches the dsh runtime | runtime_patch | ./examples/deepseek-harness/cordis.yml |
| executes system commands | exec | ×33 src, e.g. scripts/smoke-release.mjs:5, scripts/smoke-release.mjs:5 |
| decodes base64 payloads | base64_decode | ×6 src, e.g. src/api/routes/files.ts:129, src/api/routes/sessions.ts:138 |
| starts a network server | net_server | ×5 src, e.g. scripts/smoke-release.mjs:119, scripts/smoke-release.mjs:122 |
| reads credential-class env vars | token_env | MANAGED_AGENTS_API_KEY, MANAGED_AGENTS_ENVIRONMENT_KEY, MANAGED_AGENTS_SECRET_KEY, OPENAI_API_KEY |
Outbound domains
api.minimax.io mcp.notion.com api.minimaxi.com s3.amazonaws.com drivemcp.googleapis.com gmailmcp.googleapis.com calendarmcp.googleapis.com mcp.canva.com mcp.figma.com mcp.example.com
Environment variables it reads
MANAGED_AGENTS_API_KEY OPENAI_BASE_URL OPENAI_API_KEY MANAGED_AGENTS_CORS_ORIGINS MANAGED_AGENTS_ENVIRONMENT_KEY MANAGED_AGENTS_URL MANAGED_AGENTS_HOME MANAGED_AGENTS_SECRET_KEY
How to read this
Levels measure capability surface and transparency, not maliciousness. A C3 plugin can be entirely legitimate — a desktop shell genuinely needs subprocesses. The point is that you can see this before installing. See the levels explained and how dsh plugins work.
Findings come from static analysis of shipped code; nothing is executed. Think a flag is wrong? Open an issue — every flag cites the file and line it came from.