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Build an agent harness
you can measure.

Learn the loop, tools, permissions, context, and recovery. Then benchmark your agent on repeatable tasks.

CONNECT A TOOL SERVER

Add Harnesscheck to your agent

Choose your client, then run the command from a terminal. You’ll need uv installed.

codex mcp add harnesscheck --url https://check-harness.fastmcp.app/mcp

~/.codex/config.toml

[mcp_servers.harnesscheck]
url = "https://check-harness.fastmcp.app/mcp"

Connect to the hosted Harnesscheck MCP server over HTTP. Restart or reload your client after setup.

166 harnesses

Agent harnesses with adoption, autonomy, recovery, and popularity information
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01	OpenClawPersonal agent runtimes · ★ 392,358	★ 392,358	complex	headless	resumable
02	superpowersCoding harness configs and SDKs · ★ 301,531	★ 301,531	complex	n/a	n/a
03	HermesPersonal agent runtimes · ★ 254,879	★ 254,879	slightly complex	headless	resumable
04	opencodeCoding agent products (IDEs, CLIs, full suites) · ★ 216,233	★ 216,233	slightly complex	headless	resumable
05	n8nFrameworks · ★ 207,895	★ 207,895	complex	headless	durable
06	AutoGPTFrameworks · ★ 187,641	★ 187,641	complex	headless	resumable
07	Anthropic SkillsCoding harness configs and SDKs · ★ 181,940	★ 181,940	mostly simple	n/a	n/a
08	DifyFrameworks · ★ 158,787	★ 158,787	complex	headless	retry
09	langflowFrameworks · ★ 155,800	★ 155,800	complex	headless	retry
10	langchainFrameworks · ★ 148,027	★ 148,027	complex	bounded	retry

Catalog data from Best of Agent Harnesses · CC BY-SA 4.0