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harness-agents

MCP server · npm · graded 2026-10-20Source linked

ha - a terminal coding agent in Rust: approval-gated tools, a persistent Python REPL, checks plus an independent verifier, memory that survives compaction and resume, and learned skills.

No outside reports on file

harness-agents runs shell or system commands; restrict its folder reach, network access, and credentials before installing.

Based on public adoption and transparency signals as of Oct 19, 2026. Our opinion, not a code audit or security guarantee.

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What it can access

  • Local filesNo local folder access notedLOW
  • Command executionRuns shell or system commandsREVIEW
  • Network reachLocal or standard API callsLOW
  • CredentialsNo API token requiredLOW
  • Package sourcenpm (harness-agents)PUBLIC

Inferred from this listing’s public package details and description. Check the project’s source before installing.

Install

npx -y harness-agents

All setup options ↓

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About Harness Agents

Harness Agents is an MCP server focused on Developer tools and Memory & knowledge: ha - a terminal coding agent in Rust: approval-gated tools, a persistent Python REPL, checks plus an independent verifier, memory that survives compaction and resume, and learned skills.

It is published on npm as harness-agents and hosted on GitHub at devfancybear/harness-agents (2,016 weekly npm downloads, last repository push on 2026-10-23). Based on its public metadata, its operational scope includes: runs shell or system commands.

Setup

These use the package this listing points to. Check the project’s own instructions before running anything.

npm command

npx -y harness-agents

MCP client config

For Claude Desktop (claude_desktop_config.json) or Cursor (.cursor/mcp.json).

json
{
  "mcpServers": {
    "harness-agents": {
      "command": "npx",
      "args": [
        "-y",
        "harness-agents"
      ]
    }
  }
}

Why this grade

CC — Moderate risk signals

Signal-based grade (2/7 points): public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

25/100
Weekly npm downloads
2k
Listing last refreshed
2026-10-28

These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.

Security reports

No reports found for this package in our research (last checked 2026-10-29).

Check a specific version →

Risks to watch for

  • Command execution reach: Public metadata indicates shell, terminal, or container command execution. Run inside an isolated container or VM and require human approval before executing commands.
  • Dependency & version pinning: Distributed via npm (harness-agents). Pin an exact release version or commit SHA rather than floating tags so upstream updates are reviewed first.

How to lower the risk

Least-privilege permissions

  • Give it access only to the specific folders, accounts or projects it needs, never your whole drive or admin account.
  • Use a separate, limited API key or login just for this tool so you can switch it off without affecting anything else.

Network isolation

  • Run it on a work computer or sandbox account, not one holding personal or company-sensitive data.
  • If your IT team can, limit which websites and services it is allowed to contact.

Monitoring

  • Check its activity history or logs weekly at first, and look at what it changed or sent.
  • Turn on alerts for new logins or unusual usage on any account it connects to.

Red flags to watch for

  • It asks for more access than its job requires, or prompts you to paste passwords.
  • It suddenly updates with new owners, or starts contacting unfamiliar websites.

Questions

How do I install Harness Agents?

Run npx -y harness-agents in your terminal, or add the server entry to your claude_desktop_config.json or .cursor/mcp.json as shown in the Setup section on this page. Full setup docs and environment variables are in github.com/devfancybear/harness-agents.

Are there security reports about Harness Agents?

No reports found for this package in our research (last checked 2026-10-29). Harness Agents currently holds Grade C (Moderate risk signals) based on public adoption and transparency signals. Review the permissions and source repository before granting access to local files, shell commands, or API keys.

Is Harness Agents actively maintained?

Harness Agents has 2k weekly npm downloads, with its latest repository commit pushed on 2026-10-23. Our directory data was last refreshed on 2026-10-28. Check recent commit activity, release tags, and open issues at github.com/devfancybear/harness-agents before pinning it in production.

What are alternatives to Harness Agents?

You can compare Harness Agents side by side with other Memory MCP servers in the Related tools section on this page, or use the Compare tool on AgentArmorHQ.

README badge and team notes

Maintain or use Harness Agents? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.

AgentArmorHQ Risk Grade C for Harness Agents

GitHub README Markdown:

markdown
[![AgentArmorHQ Risk Grade for Harness Agents](https://agentarmorhq.com/api/badge/devfancybear-harness-agents)](https://agentarmorhq.com/skills/devfancybear-harness-agents)

HTML embed:

html
<a href="https://agentarmorhq.com/skills/devfancybear-harness-agents"><img src="https://agentarmorhq.com/api/badge/devfancybear-harness-agents" alt="AgentArmorHQ Risk Grade for Harness Agents" height="20" /></a>

Terminal check:

terminal
curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "devfancybear-harness-agents"

Share with your security lead

Need sign-off to use harness-agents? Copy this note for Slack, a ticket or a pull request.

### AgentArmorHQ Security Review Memo: harness-agents
- **Listing URL:** https://agentarmorhq.com/skills/devfancybear-harness-agents
- **Type:** App connector
- **Risk Grade:** Grade C (Moderate risk signals)
- **Outside Security Advisories on File:** 0

#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** Runs shell or system commands
- **Network reach:** Local or standard API calls
- **Credentials:** No API token required
- **Package source:** npm (harness-agents)

#### Recommended Hardened Setup
- **Command:** `npx -y --ignore-scripts harness-agents`
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.

_Based on public adoption and transparency signals as of Oct 19, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type
App connector
Publisher
devfancybear
Source code
github.com/devfancybear/harness-agents
Install command
npm install harness-agents
Est. context load
~900 tokens / turn (~5 tool schemas, 0.45% of 200k context)
Popularity
2k weekly npm downloads
Last updated
2026-10-28
Last graded
2026-10-20

Community

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