Tested with my own config.toml and works. This CLI command also does the job - however end result is slightly different.

# replace with actual firecrawl api key
codex mcp add firecrawl --env FIRECRAWL_API_KEY=fc-YOUR_API_KEY-- npx -y firecrawl-mcp

& the output in config.toml is slightly different (.env on 2 extra lines), but still works.

[mcp_servers.firecrawl]
command = "npx"
args = ["-y", "firecrawl-mcp"]
[mcp_servers.firecrawl.env]
FIRECRAWL_API_KEY = "fc-YOUR_API_KEY"

@savinmikhail I can make a PR to merge this CLI command into your branch.

@ccbbccbb hi, yep, go ahead, i'll appreciate your help