Grok Build vs Har
A side-by-side look at the Grok Build and Har MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Grok Build for coding agents work as a local process; choose Har for coding agents as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Grok Build when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- You want tools like
grok, review, websearch.
Choose Har when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Coding Agents | Coding Agents |
| Quality signal | 53/100 · Good | 52/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | No auth required |
| Pricing | Not declared | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 128 |
| Directory activity | 0 views 0 installs 0 upvotes | 2 views 0 installs 0 upvotes |
| Tools | 8 | Not listed |
| Full listing | View Grok Build | View Har |
Tools & capabilities
Grok Build tools 8
grokRun a headless Grok agent. Prompt, session resume/continue/fork, model, effort, tool allow/denyreviewReview a git diff: working tree, a merge-base diff against a ref, or a single commitwebsearchResearch a question on the web, and report which searches and sources it actually usedstatusPoll a background run, or list recent onesstopTerminate a background run's process treesessionsList, search, and look up the Grok sessions on this machinecheckServer version, resolved binary, `grok version`, auth, permission ceiling, run defaultshelpgrok --help` passthrough
Har tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Grok Build
{
"mcpServers": {
"grok-build": {
"command": "npx",
"args": [
"-y",
"grok-build-mcp-server"
]
}
}
}
Har
{
"mcpServers": {
"osfactory-har": {
"command": "npx",
"args": [
"-y",
"@osfactory/har"
]
}
}
}
Frequently asked questions
Grok Build is categorized under Coding Agents and uses a local stdio subprocess. Har belongs to Coding Agents and uses a local stdio subprocess. Pick Grok Build for coding agents work and Har for coding agents.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Grok Build has no declared pricing — check the project's own site. Har is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add grok-build and osfactory-har as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Grok Build has a quality signal of 53/100 (Good) with 0 views, 0 installs and 0 GitHub stars. Har has 52/100 (Good) with 2 views, 0 installs and 128 GitHub stars.