Remote coding harness exposed as a secure Streamable HTTP MCP server
Cloud Harness MCP is an MIT-licensed remote coding harness exposed through authenticated Streamable HTTP MCP. It opens an isolated clone in a TTL-limited Docker executor and gives a trusted owner or named mutually trusted operators structured workspace, file, code-intelligence, command, shell, session, dependency-task, Git, worktree, skill, hook, memory, and repository-defined deployment tools.
[!WARNING] This is a private service for one security domain. Its operators must trust one another because it is intentionally capable of arbitrary command execution inside a shared-kernel executor. Principal isolation is not a hostile multi-tenant sandbox. Read the security model before operating it.
Static-header clients use dashboard-managed API keys at the separate gateway:
MCP is the northbound control protocol; the harness is the execution runtime. The split keeps Internet-facing request handling away from Docker authority and keeps repository credentials out of long-lived executors.
The source of truth for these boundaries is compose.yaml, apps/runner/src/workspace-service.ts, and the security model.
Remote fetch, pull, and push use a sibling transfer repository that the executor cannot see. Push requires a GitHub App installation with repository write access; clone/fetch/pull need read access. See configuration and MCP semantics.
1. Read the security model, then configure one of the supported clients below with the owner token kept in local private configuration. 2. Ask the client to call workspaceopen with a credential-free HTTPS repository URL and a fresh idempotency
From the project README.
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