AgentIndex icon
AgentIndex
fastmcp logo
fastmcp
★ 3.3k
vs
sandbase-harness logo
sandbase-harness
★ 635

fastmcp vs sandbase-harness

fastmcp: FastMCP is an opinionated TypeScript framework built on the official MCP SDK, designed to simplify the creation of MCP servers. It handles boilerplate, provides intuitive APIs, and includes built-in best practices for session management, streaming, and error handling.; sandbase-harness: SandBase Harness is a local-first runtime designed for AI agents, providing essential infrastructure like persistent sessions, sandboxed execution environments, and comprehensive audit trails. It enables secure and observable agent operations directly on your machine or within your own infrastructure, supporting various models and tool integrations.

01

TL;DR

fastmcp logo
fastmcpDev Tooling · ★ 3.3k

Rapidly building MCP servers without low-level implementation details.

Read fastmcp full review →
sandbase-harness logo
sandbase-harnessDev Tooling · ★ 635

Running auditable coding agents with controlled and sandboxed code execution.

Read sandbase-harness full review →
02

Side-by-Side Comparison

Field
fastmcp logofastmcp
sandbase-harness logosandbase-harness
Category
Dev Tooling
Dev Tooling
Stars
★ 3.3k
★ 635
License
MIT
Apache-2.0
Install Command
npm install fastmcp
git clone --branch v0.3.8 --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
Updated
1d ago
5d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
TypeScript, MCP, Server Framework
AI Agent Runtime, Sandboxed Execution, Session Management
03

Features

fastmcp logofastmcp
01Simple Tool, Resource, Prompt definition
02Authentication, Session ID and Request ID tracking
03HTTP Streaming (with SSE compatibility)
04Stateless mode for serverless deployments
05CLI for testing and debugging
sandbase-harness logosandbase-harness
01Local, Docker, Kubernetes, and self-hosted worker sandboxes for safe code execution.
02Persistent sessions, resumable event streams, audit logs, and replay capabilities for inspecting long-running agents.
03MCP toolsets, credential vaults, and permission policies for controlling tool access.
04Compatibility with OpenAI, Anthropic, MiniMax, DeepSeek V4, and other OpenAI-compatible model providers.
05Local-first storage with SQLite for metadata and file storage, without a required hosted control plane.
04

Use Cases

fastmcp logofastmcp
↳Rapidly building MCP servers without low-level implementation details.
↳Deploying MCP servers in serverless environments.
↳When an opinionated framework is preferred for best practices and simplified development.
sandbase-harness logosandbase-harness
↳Running auditable coding agents with controlled and sandboxed code execution.
↳Using DeepSeek Harness as an interactive front end for agents, with rich session management.
↳Managing and securing third-party plugins with sandbox and filesystem protection.
↳Building an auditable research agent, combining evidence ledgers with sandboxed execution, credentials, audit, and replay.
↳Self-hosting an AI agent runtime on your own infrastructure for full control and data privacy.
05

Best For

fastmcp logofastmcp
Trending
sandbase-harness logosandbase-harness
Trending
FAQ

FAQ

What is the difference between fastmcp and sandbase-harness?
Both fastmcp and sandbase-harness are in the Dev Tooling category. fastmcp has 3.3k stars, while sandbase-harness has 635 stars.
Which is better, fastmcp or sandbase-harness?
The best choice depends on your use case. Choose fastmcp if Rapidly building MCP servers without low-level implementation details., and sandbase-harness if Running auditable coding agents with controlled and sandboxed code execution..
Is fastmcp free or open source?
Yes, fastmcp is open source on GitHub (MIT).
Is sandbase-harness free or open source?
Yes, sandbase-harness is open source on GitHub (Apache-2.0).
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Related

Alternatives to fastmcp →Alternatives to sandbase-harness →fastmcp details →sandbase-harness details →