mcp-server
An MCP (Model Context Protocol) server that runs user-provided code inside isolated, resource-limited sandbox environments using runc/OCI containers. It supports multiple programming languages via language-specific handlers and offers persistence for sandbox state via SQLite. It can expose MCP over stdio or HTTP/WebSocket and includes configurable security policies and audit logging.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Security is primarily based on container/process isolation via runc/OCI, resource limits, configurable security policies, and audit logging (as claimed in the README). However, the provided content does not document TLS enforcement details, authentication/authorization, scope granularity, or how secrets are handled, so scores are conservative. For sandboxing, additional crucial controls (network egress restrictions, filesystem mounts, seccomp/capabilities, image patching cadence) are not described in the supplied text.
⚡ Reliability
Best When
When you need an agent-accessible, multi-language execution sandbox that isolates processes via OCI containers and you can deploy on Linux with container support.
Avoid When
When you cannot enforce/verify network, filesystem, and container escape protections beyond what is documented, or when you need first-class enterprise auth, documented rate limiting, and strong API error/retry semantics.
Use Cases
- • Securely executing untrusted code snippets or scripts for analysis
- • AI-assisted coding workflows where the model needs to run/verify code safely
- • Polyglot “run code” tooling for LLM agents (Python/JS/Go/Rust/Java/C++/C#/Shell, etc.)
- • Testing or CI-like execution of multi-language programs in a controlled environment
Not For
- • Running code that must access the public internet or sensitive internal systems without strict network/file isolation guarantees
- • High-trust environments where container sandboxing is unnecessary
- • Use cases requiring strong enterprise auth/identity integrations (not evidenced here)
- • Systems needing documented idempotent APIs/operations guarantees (not evidenced here)
Interface
Authentication
No authentication mechanism (API keys/OAuth/etc.) is described in the provided README content. For an HTTP/WebSocket MCP mode, authentication/authorization would be expected but is not documented here.
Pricing
Agent Metadata
Known Gotchas
- ⚠ Sandboxed execution commonly has limits (CPU/memory/disk) that may cause failures; agents should be prepared to handle execution timeouts/OOM/disk-full conditions.
- ⚠ When using container-based runners, agents may need to explicitly provide all dependencies/source in the request; “import/package availability” may differ from the agent’s environment.
- ⚠ If MCP is exposed over HTTP/WebSocket, ensure transport/auth/network isolation is configured appropriately; the README does not document auth details.
- ⚠ State persistence via SQLite may require cleanup/retention policies to avoid unintended cross-run state or storage growth.
Alternatives
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Scores are editorial opinions as of 2026-04-04.