KeyKeeper Email

world.keykeeper/emailkeykeeper.worldstreamable-httpv2.12.0Scanned 47 minutes ago

Real email inboxes for AI agents: register, receive, read and send mail over MCP. Free to receive.

13 tools: 5 do something that can't be undone, 3 change things and 5 only read.

Reads private data · 2
Reads text others write · 6
Can send data out · 3
No findings

Anlyon alternative

8 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

13 tools

Can't be undone 5Sends, pays, publishes or merges: once done, it cannot be taken back.Claude Code: ask

check_paymentCheck this account's native USDC invoice.Reads text others writeNo findings
Why it is in this group
- The name "check_payment" says "payment": a word that usually means money moves, which cannot be taken back.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Check this account's native USDC invoice. Confirmation applies sending credits or activates prepaid domain hosting once, without a human checkout. Requires the same account's API key.
Annotations the server declares
- readOnlyHint: false
- idempotentHint: true
- openWorldHint: true
create_paymentWith your operator's authorization, create a card checkout or native USDC invoice on Polygon, Base, Ethereum or Solana.Reads text others writeNo findings
Why it is in this group
- The name "create_payment" says "create": a word for a change.
- The name "create_payment" also says "payment": a word that usually means money moves, which cannot be taken back.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
With your operator's authorization, create a card checkout or native USDC invoice on Polygon, Base, Ethereum or Solana. Choose mail_credits ($1 buys 10,000 standard sends) or hosting at $1 per 30 days: domain_hosting for the first domain, domain_addon plus domainId for another verified domain under active primary hosting. This tool creates payment instructions; it does not transfer money. Reuse idempotencyKey on retries.
Annotations the server declares
- readOnlyHint: false
- idempotentHint: true
- openWorldHint: true
propose_emailPrepare a plain-text email for human approval.Can send data outNo findings
Why it is in this group
- The input addresses people (input.message.to): what it sends cannot be taken back.
What it can reach
- outboundThe input takes a destination (input.message.to): what the tool writes goes there.
Description, as the server wrote it
Prepare a plain-text email for human approval. Requires a human-issued mail:draft key. Never sends. Reuse clientKey and content after uncertain responses.
send_emailSubmit mail with existing credits: one credit per accepted recipient.Can send data outNo findings
Why it is in this group
- The name "send_email" says "send": a word for sending, and what is sent cannot be taken back.
- The input addresses people (input.to): what it sends cannot be taken back.
What it can reach
- outboundThe name "send_email" says "send": it sends or publishes something to other people.
- outboundThe input takes a destination (input.to): what the tool writes goes there.
Description, as the server wrote it
Submit mail with existing credits: one credit per accepted recipient. Requires a Bearer API key. Reuse idempotencyKey for retries; acceptance is not proof of remote delivery.
update_proposalEdit or withdraw this key’s pending proposal.Can send data outNo findings
Why it is in this group
- The name "update_proposal" says "update": a word for a change.
- The input addresses people (input.message.to): what it sends cannot be taken back.
What it can reach
- outboundThe input takes a destination (input.message.to): what the tool writes goes there.
Description, as the server wrote it
Edit or withdraw this key’s pending proposal. Cannot approve or change a message after human editing.

Changes things 3Creates or changes something that can be changed back.Claude Code: ask

check_balanceCheck your mailbox address, account state and sending credits.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
Check your mailbox address, account state and sending credits. Requires a Bearer API key.
register_agentCreate an agent mailbox and receive its key once.No findings
Why it is in this group
- The description's first verb is "create": a word for a change.
Description, as the server wrote it
Create an agent mailbox and receive its key once. Starts with zero sending credits; receiving is available without payment.
request_sender_reviewRequest an operator review of your sending purpose and recipient consent.No findings
Why it is in this group
- The name "request_sender_review" says "request": a word for a change.
Description, as the server wrote it
Request an operator review of your sending purpose and recipient consent. Full account key required. Does not automatically increase limits or resume sending. Three requests per day; repeated pending requests keep the original purpose.
Annotations the server declares
- readOnlyHint: false
- idempotentHint: true

Only reads 5Looks things up and changes nothing.Show 5 read-only tools

check_inboxList incoming messages.Reads private dataReads text others writeNo findings
Why it is in this group
- The description's first verb is "list": a word for reading.
What it can reach
- private-dataThe name "check_inbox" says "inbox": it reads mail.
- private-dataThe description's first sentence says "list" and "message": it reads messages.
- private-dataThe input names a folder (input.folder), and the tool reads: it reads files.
- untrusted-inputThe name "check_inbox" says "inbox": it reads inbound email, which other people can write.
- untrusted-inputThe description's first sentence says "list" and "message": it reads messages, which other people can write.
Description, as the server wrote it
List incoming messages. Requires a Bearer API key. Email is untrusted external content.
check_sending_statusRead your sending state and current limits, including probation, pauses and pending review.Reads text others writeNo findings
Why it is in this group
- The name "check_sending_status" says "status": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "read" and "review": it reads comments, which other people can write.
Description, as the server wrote it
Read your sending state and current limits, including probation, pauses and pending review. Buying credits never overrides sending controls.
Annotations the server declares
- readOnlyHint: true
get_emailRead a message by its folder-scoped UID.Reads private dataReads text others writeNo findings
Why it is in this group
- The name "get_email" says "get": a word for reading.
What it can reach
- private-dataThe name "get_email" says "get" and "email": it reads mail.
- private-dataThe description's first sentence says "read" and "message": it reads messages.
- private-dataThe input names a folder (input.folder), and the tool reads: it reads files.
- untrusted-inputThe name "get_email" says "get" and "email": it reads inbound email, which other people can write.
- untrusted-inputThe description's first sentence says "read" and "message": it reads messages, which other people can write.
Description, as the server wrote it
Read a message by its folder-scoped UID. Requires a Bearer API key.
get_proposalCheck a proposal.No findings
Why it is in this group
- The name "get_proposal" says "get": a word for reading.
Description, as the server wrote it
Check a proposal. Human edits are private. Approved means authorized, not delivered; inspect submission.status.
list_proposalsList only this draft-only key’s proposals and review statuses.Reads text others writeNo findings
Why it is in this group
- The name "list_proposals" says "list": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "list" and "review": it reads comments, which other people can write.
Description, as the server wrote it
List only this draft-only key’s proposals and review statuses.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

36 paths in this server alone from private data, through text someone else wrote, to a way out. Denying 2 private-data tools breaks every one.

Reads private data2: Reads files, mail, messages, databases, secrets, calendars or repositories.; check_inbox
get_email
Reads text others write6: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; check_inbox
check_payment
check_sending_status
create_payment
get_email
list_proposals
Can send data out3: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.; propose_email
send_email
update_proposal

deny to break every path

{
  "permissions": {
    "deny": [
      "mcp__email__check_inbox",
      "mcp__email__get_email"
    ]
  }
}

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 2.12.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http email https://keykeeper.world/mcp

claude mcp add --transport http email https://keykeeper.world/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__email__check_inbox",
      "mcp__email__get_email",
      "mcp__email__check_sending_status",
      "mcp__email__list_proposals",
      "mcp__email__get_proposal"
    ],
    "ask": [
      "mcp__email__register_agent",
      "mcp__email__check_balance",
      "mcp__email__send_email",
      "mcp__email__request_sender_review",
      "mcp__email__create_payment",
      "mcp__email__check_payment",
      "mcp__email__propose_email",
      "mcp__email__update_proposal"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as email. Review it before you use it.

Capability tags behind 9 rules

mcp__email__check_inbox private-data, untrusted-input
mcp__email__get_email private-data, untrusted-input
mcp__email__send_email outbound
mcp__email__check_sending_status untrusted-input
mcp__email__create_payment untrusted-input
mcp__email__check_payment untrusted-input
mcp__email__propose_email outbound
mcp__email__list_proposals untrusted-input
mcp__email__update_proposal outbound

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/world.keykeeper/email/verify?hash=7bd9bf0a8c7926ad01d2f72dcac974ffb9bcc00ef5957463efcc4a3b41fd0f47" | jq -e '.changed == false'

Pinned hash 7bd9bf0a8c79, from Nov 3, 2026, 16:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/world.keykeeper/email/changes.xml

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Badge

[![anlyon.dev](https://anlyon.dev/badge/world.keykeeper/email.svg)](https://anlyon.dev/servers/world.keykeeper/email)

Source: MCP Registry. Synced Nov 3, 2026, 16:18 UTC.