Can Codex post to social media?

Yes, with Mynahcast. Codex connects through Mynahcast's MCP server at https://api.mynahcast.xyz/mcp, authenticated with a Mynahcast API key as a bearer token. It can then draft and schedule posts to your connected channels (Bluesky, Mastodon, Telegram, Discord, Nostr, Lemmy and more), and each post waits for your approval.

Can Codex publish without my approval?

Not with an Agent key. Agent keys can draft, validate and schedule, but the server refuses approval decisions from agents, so a person approves every post in Mynahcast.

Is it free to connect Codex to Mynahcast?

The MCP server and API are included on every Mynahcast plan, from $12 per month with a 7-day free trial. You need your own access to the agent itself.

MCP

Connect Codex

~/.codex/config.toml (CLI, IDE extension and app share it)

Steps

1In Mynahcast, open Agents & API and create a key. Pick the Agent preset so its posts wait for your approval. The key is shown once; copy it.
2Add the server with the CLI, or paste the table into ~/.codex/config.toml. Codex reads the key from the environment variable you name.
3Run codex mcp list to confirm it's enabled.

Create an API key

Terminal

export MYNAHCAST_KEY="myn_live_…"
codex mcp add mynahcast --url https://api.mynahcast.xyz/mcp --bearer-token-env-var MYNAHCAST_KEY

config.toml

~/.codex/config.toml

[mcp_servers.mynahcast]
url = "https://api.mynahcast.xyz/mcp"
bearer_token_env_var = "MYNAHCAST_KEY"

Check the key works

Lists the channels you've connected; you'll need their ids to post.

List channels

curl "https://api.mynahcast.xyz/v1/channels" \
  -H "Authorization: Bearer $MYNAHCAST_KEY"

Tools your agent gets

Filtered by the key's scopes. Anything that changes data accepts dry_run.

mynahcast_validate_postCheck a post against every target channel without saving it
mynahcast_create_postCreate a post for one brand, fanned out to one or more channels
mynahcast_get_postRead one post with its per-channel delivery state
mynahcast_list_postsList posts
mynahcast_update_postEdit a post (an edit voids an earlier approval)
mynahcast_reschedule_postMove a post to a new time
mynahcast_delete_postDelete a post that hasn't gone out
mynahcast_get_post_timelineEvery attempt, approval and read-back for a post
mynahcast_submit_for_approvalAsk a human to approve a post
mynahcast_decide_approvalApprove or request changes (humans only; agents are refused)
mynahcast_list_channelsConnected channels
mynahcast_get_channel_capabilitiesLimits for one channel (characters, media, threads)
mynahcast_request_uploadGet a signed URL to upload media
mynahcast_complete_uploadMark an upload as finished
mynahcast_get_brand_voiceRead the brand's voice profile
mynahcast_update_brand_voicePublish a new voice version (publisher keys)

Frequently asked questions

Can Codex post to social media?: Yes, with Mynahcast. Codex connects through Mynahcast's MCP server at https://api.mynahcast.xyz/mcp, authenticated with a Mynahcast API key as a bearer token. It can then draft and schedule posts to your connected channels (Bluesky, Mastodon, Telegram, Discord, Nostr, Lemmy and more), and each post waits for your approval.
Can Codex publish without my approval?: Not with an Agent key. Agent keys can draft, validate and schedule, but the server refuses approval decisions from agents, so a person approves every post in Mynahcast.
Is it free to connect Codex to Mynahcast?: The MCP server and API are included on every Mynahcast plan, from $12 per month with a 7-day free trial. You need your own access to the agent itself.

MCP for social media Agent docs About API keys Codex MCP docs