Best of Agent Harnesses is a curated directory of agent harnesses, which are runtimes that let AI models act by controlling tools, permissions, context, and saved state around an action loop. It helps people compare harnesses and use related templates, playbooks, and learning resources for building agentic systems. Catalogue entries include agents and other configurations that can query or support the listed harnesses.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/RyanAlberts/best-of-Agent-HarnessesWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/mcp/ryanalberts/best-of-agent-harnesses/agent-harnesses)<a href="https://agentmods.dev/mcp/ryanalberts/best-of-agent-harnesses/agent-harnesses"><img src="https://agentmods.dev/badge/mcp/ryanalberts/best-of-agent-harnesses/agent-harnesses/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/mcp/ryanalberts/best-of-agent-harnesses/agent-harnesses"><img src="https://agentmods.dev/badge/mcp/ryanalberts/best-of-agent-harnesses/agent-harnesses.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
agent-harnesses scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
The source is not reproduced here
Licensed CC-BY-SA-4.0
The repository is licensed CC-BY-SA-4.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 9 lines scan A d30c197bd089
agent-harnesses is an MCP server published in the GitHub repository RyanAlberts/best-of-Agent-Harnesses (1,461 stars, last pushed 3d ago), licensed CC-BY-SA-4.0. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
agent-harnesses compared with mcp servers from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| agent-harnessesRyanAlberts/best-of-Agent-Harnesses | MCP server | 1.5k | 3d ago | CC-BY-SA-4.0 | A | — | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |
| cdpLykhoyda/rn-dev-agent | MCP server | 20 | 12d ago | MIT | A | — | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |
| upworkcitizenweb3/upwork-agent | MCP server | 2 | 6mo ago | none | A | — | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |
| context-book-mcpaditya201551/context-book | MCP server | 5 | 5mo ago | MIT | A | — | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |
| docs-langchainlangchain-ai/langchain | MCP server | 149k | yesterday | MIT | A | — | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |
| component-explorermicrosoft/vscode | MCP server | 195k | yesterday | MIT | A | — | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |
| codex_message_boardopenai/codex | MCP server | 133k | yesterday | Apache-2.0 | A | — | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |