Mailgi MCP server

• Registry namexyz.mailgi/mailgiverified in the MCP registry

The registry name sits under mailgi.xyz. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-11-01
• Tools67
• Server calls itselfmailgi
• Server version1.0.0
• Protocol version2025-06-18

On 2026-11-01 the server answered initialize and tools/list without a sign-in. First answer in 229 ms.

• Whether its tools do the product's job has not been judged yet.
• Checked on 4 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
• Answeredmeasuring4 of the 7 daily checks it takes to print a share
• Median first answer253 ms
• Space in an agent's context≈ 6,039 tokensthe definitions of all its tools (67), which an agent carries on every turn
• Tool definitionsA · 92 of 100
• Typed results0 of 67 toolsdeclared outputSchema: results come typed, read once

• No description an agent can choose by: 1 of 67
• Parameters without a description: in 33 of 67

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• register_agent

  Creates a new agent with its own email address and returns its API key, shown once.

• org_login_request_code

  Emails a 6-digit dashboard login code to a human's address. Creates the account on first login.

• org_login_verify

  Exchanges an emailed login code for a dashboard session token.

• topup_lookup

  Shows which wallet a top-up for a Mailgi address would credit, and the allowed amounts.

• topup_start

  Creates a card payment link for the wallet behind any Mailgi address. Give it to a human to pay.

• topup_status

  Returns whether a top-up payment has been paid and credited.

• health

  Checks that the Mailgi API, its database and the mail server are up.

• agent_get

  Returns this agent's profile: its addresses, label and domain.

• agent_usage

  Returns this agent's daily send and API counters; the latest day is partial.

• agent_delete

  Permanently deletes this agent, its mailbox and all its API keys.

• mail_list

  Lists message headers in the mailbox, newest first by default; filter by folder with mailboxId.

• mail_get

  Returns one message with its full text and HTML body.

• mail_send

  Sends an email from this agent's address. Mail to outside addresses is charged to the wallet.

• mail_delete

  Moves a message to the Trash folder.

• mail_move

  Moves a message to another folder.

• mail_set_flags

  Marks a message as seen or unseen, flagged or unflagged.

• mailbox_list

  Lists all folders, including Inbox, Sent and Trash.

• mailbox_create

  Creates a folder, optionally nested under another.

• mailbox_rename

  Renames a folder.

• mailbox_delete

  Deletes a custom folder.

• apikey_list

  Lists this agent's API keys. Key values are never shown again.

• apikey_create

  Creates another API key for this agent. The key is shown once.

• apikey_revoke

  Revokes an API key immediately.

• billing_get

  Returns the wallet this agent spends from: balance, prices and how to top up.

• billing_topup

  Creates a card payment link for this agent's wallet. Give it to a human to pay.

• billing_transactions

  Lists the wallet ledger, newest first.

• webhook_list

  Lists this agent's webhook endpoints.

• webhook_create

  Registers an HTTPS URL to be notified when mail arrives. The signing secret is shown once.

• webhook_delete

  Deletes a webhook endpoint.

• webhook_deliveries

  Lists recent delivery attempts for a webhook endpoint.

• webhook_resend

  Queues a delivery attempt to be sent again.

• webhook_enable

  Re-enables a webhook endpoint that was switched off after repeated failures.

• org_me

  Returns the signed-in user and the organizations they belong to.

• org_logout

  Revokes the current dashboard session token.

• org_list

  Lists the organizations the signed-in user belongs to.

• org_create

  Creates an organization; the signed-in user becomes its owner.

• org_get

  Returns one organization.

• org_rename

  Renames an organization.

• org_member_list

  Lists an organization's members and their roles.

• org_member_set_role

  Changes a member's role.

• org_member_remove

  Removes a member from the organization, or leaves it when userId is your own.

• org_invite_create

  Emails an invitation to join the organization.

• org_invite_list

  Lists pending invitations.

• org_invite_revoke

  Revokes a pending invitation.

• invite_accept

  Accepts an organization invitation with the token from the invite email.

• domain_attach

  Attaches a custom domain and returns the DNS records to publish.

• domain_list

  Lists an organization's custom domains.

• domain_get

  Returns a domain's verification status and the DNS records it needs.

• domain_verify

  Re-checks the domain's DNS records and verifies it if they are correct.

• domain_detach

  Detaches a custom domain from the organization.

• domain_inbox_list

  Lists the inboxes (agents) on a domain.

• domain_inbox_create

  Creates an inbox with a chosen address on a domain. Its API key is shown once.

• domain_inbox_delete

  Removes an inbox and its mail from a domain.

• regtoken_create

  Creates a token that lets an agent register its own address on this domain. Shown once.

• regtoken_list

  Lists a domain's registration tokens.

• regtoken_revoke

  Revokes a registration token.

• org_usage

  Returns daily send, receive and API counters across the organization.

• domain_usage

  Returns daily send, receive and API counters for one domain.

• org_billing_get

  Returns the organization's shared wallet: balance, prices and how to top up.

• org_billing_topup

  Creates a card payment link for the organization wallet.

The first 60 of 67, as the server listed them.