AgentIndex icon
AgentIndex
agy-mcp logo
agy-mcp
★ 25
vs
harness-sdk logo
harness-sdk
★ 8.9k

agy-mcp vs harness-sdk

agy-mcp: Agy-mcp wraps Google's Antigravity CLI into 11 typed MCP tools, making it callable by any MCP client like Claude Code or OpenAI Codex. It also provides optional Skill bundles to teach supporting platforms when and how to invoke these tools, alongside robust safety policies for secure execution.; harness-sdk: This monorepo holds the Strands Agents SDKs for Python and TypeScript plus Strands harness, a fully assembled agent created with one create_harness() call. It runs in your own process and covers the agent loop, tools, MCP, multi-agent patterns, memory, sessions, guardrails, tracing and evals across Bedrock, Anthropic, OpenAI, Gemini and other providers.

01

TL;DR

agy-mcp logo
agy-mcpMulti-Agent · ★ 25

Getting a second opinion on a bug hypothesis (using `mode="review"`).

Read agy-mcp full review →
harness-sdk logo
harness-sdkMulti-Agent · ★ 8.9k

Replacing a hand-rolled agent loop with a maintained SDK

Read harness-sdk full review →
02

Side-by-Side Comparison

Field
agy-mcp logoagy-mcp
harness-sdk logoharness-sdk
Category
Multi-Agent
Multi-Agent
Stars
★ 25
★ 8.9k
License
MIT
Apache-2.0
Install Command
curl -LsSf https://astral.sh/uv/install.sh | sh && uv tool install agy-mcp
pip install strands-harness
Updated
1w ago
1d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
MCP, LLM Agent, CLI Wrapper
agent-sdk, python, typescript
03

Features

agy-mcp logoagy-mcp
01Provides Skill bundles for agent platforms to learn invocation context and safety rules.
02Implements a robust safety policy for redaction, write control, and sensitive file access.
03Supports synchronous one-off calls and background long-running tasks with status and result retrieval.
04Offers cross-platform process group termination for running jobs.
harness-sdk logoharness-sdk
01Strands harness: a ready-made agent with default model, tools, memory, sessions and context management
02Lower-level SDKs in Python (3.10+) and TypeScript (Node 22+) to own the agent loop yourself
03Lifecycle controls such as turn limits, token budgets, cancellation and hooks on every step
04Built-in MCP, structured output, streaming, multi-agent patterns, guardrails, tracing and evals
05Model portability across Amazon Bedrock, Anthropic, OpenAI, Gemini, Ollama and custom providers
04

Use Cases

agy-mcp logoagy-mcp
↳Getting a second opinion on a bug hypothesis (using `mode="review"`).
↳Applying a reviewed diff to the codebase (`mode="execute", allow_write=True`).
↳Performing large-scale refactoring tasks over several hours (`agy_start(..., mode="long")`).
↳Environment and authentication detection without leaking secrets (`agy_doctor`).
harness-sdk logoharness-sdk
↳Replacing a hand-rolled agent loop with a maintained SDK
↳Building production agents on AWS with Bedrock models
↳Prototyping a coding or research agent quickly with the harness and CLI
↳Adding tracing, guardrails and evals to existing agent code
05

Best For

agy-mcp logoagy-mcp
—
harness-sdk logoharness-sdk
EssentialTrending
FAQ

FAQ

What is the difference between agy-mcp and harness-sdk?
Both agy-mcp and harness-sdk are in the Multi-Agent category. agy-mcp has 25 stars, while harness-sdk has 8.9k stars.
Which is better, agy-mcp or harness-sdk?
The best choice depends on your use case. Choose agy-mcp if Getting a second opinion on a bug hypothesis (using `mode="review"`)., and harness-sdk if Replacing a hand-rolled agent loop with a maintained SDK.
Is agy-mcp free or open source?
Yes, agy-mcp is open source on GitHub (MIT).
Is harness-sdk free or open source?
Yes, harness-sdk is open source on GitHub (Apache-2.0).
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Related

Alternatives to agy-mcp →Alternatives to harness-sdk →agy-mcp details →harness-sdk details →