Grok Build vs Codex Delegate
A side-by-side look at the Grok Build and Codex Delegate 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 Codex Delegate 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 Codex Delegate when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- You want tools like
delegate, cancel, doctor.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Coding Agents | Coding Agents |
| Quality signal | 53/100 · Good | 63/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | Not declared |
| Pricing | Not declared | BYOK (pay the provider) |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 2 |
| Directory activity | 0 views 0 installs 0 upvotes | 6 views 0 installs 0 upvotes |
| Tools | 8 | 3 |
| Full listing | View Grok Build | View Codex Delegate |
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
Codex Delegate tools 3
delegateDelegate a coding task to OpenAI Codex. Never run codex from the shell — use this tool. Check status before trusting result — a run that spawns then fails returns normally. Keep model, reasoningEffort and fast at their defaults unless the user asks. See the delegate skill.cancelCancel active runs. delegationId selects one (announced in progress before spawn — the only handle if a run wedges at startup), threadId all on its thread, neither all. Waits for settlement; if a process tree survives the kill deadline, it still returns and the delegate result warns. Status: cancelled, nothing-active, or not-found (no active run with this ID).doctorDiagnose plugin/CLI/login, recursion, and workspace (default: server cwd). deep adds no-quota help and model-catalog checks.
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"
]
}
}
}
Codex Delegate
{
"mcpServers": {
"codex-delegate": {
"command": "npx",
"args": [
"-y",
"codex-delegate-mcp"
]
}
}
}
Frequently asked questions
Grok Build is categorized under Coding Agents and uses a local stdio subprocess. Codex Delegate belongs to Coding Agents and uses a local stdio subprocess. Pick Grok Build for coding agents work and Codex Delegate 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. Codex Delegate is bring-your-own-key: usage is billed by the API provider you supply a key for. 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 codex-delegate 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. Codex Delegate has 63/100 (Good) with 6 views, 0 installs and 2 GitHub stars.