Use Afterwren MCP with OpenAI Codex CLI

Retired-API replacements: Clearbit-style company autocomplete, logos, profiles; geocoding; books.

Remote MCP server (Streamable HTTP), nothing to install. Free: 100 free calls/day · Paid: $5 pack; $19/mo; x402 $0.002/call

Set it up

Open ~/.codex/config.toml (create it if needed).
Add the [mcp_servers] table shown and save.
Start Codex; the server's tools are available to the agent.
Ask a question the tools can answer.

Add to ~/.codex/config.toml:

[mcp_servers.afterwren]
url = "https://afterwren.cybermaxtools.com/mcp?via=use-with-codex"

With a paid key:

[mcp_servers.afterwren]
url = "https://afterwren.cybermaxtools.com/mcp?via=use-with-codex"
env_http_headers = { "x-api-key" = "CYBERMAX_API_KEY" }

env_http_headers maps the header to an environment variable name, so the key stays in your environment.

Where it goes:

~/.codex/config.toml (or .codex/config.toml in a trusted project)

Config format checked 2026-10-09 against OpenAI Codex CLI's MCP documentation.

Tools you get

Endpoint checked 2026-10-09: https://afterwren.cybermaxtools.com/mcp answered an MCP initialize (protocol 2025-06-18) and tools/list with 7 tools, all marked read-only. No key was used and no tool was called.

Tool	What it does	Required inputs
`company_suggest`	Company name or prefix to a list of {name, domain, logo, description}, best-known first (Clearbit Autocomplete replacement).	`query`
`company_logo`	The best logo/icon URL for a domain from the company's own site, with alternatives (Clearbit Logo replacement).	`domain`
`company_profile`	Name, description, logo, social links, email provider (MX/SPF) and Wikidata facts (founded, HQ, industry, employees, ticker) for a domain.	`domain`
`geocode`	Address or place to lat/lng with city, state, postal, country; US results include county, tract and block FIPS.	`q`
`reverse_geocode`	Coordinates to the nearest address and, in the US, county/tract/block FIPS.	`lat`, `lng`
`book_search`	Books by title/author or ISBN: authors, year, ISBNs, pages, rating, cover (Goodreads API replacement, Open Library data).	none
`encyclopedia_search`	Wikipedia full-text search: titles, URLs and snippets (for grounding after the Bing Search API retirement).	`q`

Test the endpoint from a terminal

This lists the tools without a key and without calling any of them:

curl -s https://afterwren.cybermaxtools.com/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

If it does not work

Each server is its own [mcp_servers.<name>] table; keep the name to letters, digits, dashes and underscores.
For a fixed header value instead of an environment variable, Codex also documents http_headers.
The free tier has a daily limit (see the pricing line above); a paid key raises it.

Afterwren in other clients

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