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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "email": {
      "type": "http",
      "url": "https://keykeeper.world/mcp",
      "headers": {
        "Authorization": "Bearer ${EMAIL_TOKEN}"
      }
    }
  }
}

claude mcp add --transport http email https://keykeeper.world/mcp --header "Authorization: Bearer ${EMAIL_TOKEN}"

[mcp_servers.email]
url = "https://keykeeper.world/mcp"
bearer_token_env_var = "EMAIL_TOKEN"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "email": {
      "type": "remote",
      "url": "https://keykeeper.world/mcp",
      "enabled": true,
      "headers": {
        "Authorization": "Bearer {env:EMAIL_TOKEN}"
      }
    }
  }
}

{
  "mcpServers": {
    "email": {
      "type": "http",
      "url": "https://keykeeper.world/mcp",
      "headers": {
        "Authorization": "Bearer ${EMAIL_TOKEN}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=email&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8va2V5a2VlcGVyLndvcmxkL21jcCIsImhlYWRlcnMiOnsiQXV0aG9yaXphdGlvbiI6IkJlYXJlciAke0VNQUlMX1RPS0VOfSJ9fQ%3D%3D"
}

{
  "servers": {
    "email": {
      "type": "http",
      "url": "https://keykeeper.world/mcp",
      "headers": {
        "Authorization": "Bearer ${EMAIL_TOKEN}"
      }
    }
  }
}

{
  "mcpServers": {
    "email": {
      "httpUrl": "https://keykeeper.world/mcp",
      "headers": {
        "Authorization": "Bearer ${EMAIL_TOKEN}"
      }
    }
  }
}

extensions:
  "email":
    enabled: true
    name: "email"
    type: streamable_http
    uri: "https://keykeeper.world/mcp"
    headers:
      "Authorization": "Bearer ${EMAIL_TOKEN}"
    timeout: 300

Placeholders to fill from your own secret store: ${EMAIL_TOKEN}. The registry never accepts secret values.

Quality 83 / 100good

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene81 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
warn
tools.annotationsonly 4 of 13 tools declare readOnlyHint or destructiveHint
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: register_agent (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); request_sender_review (destructiveHint, openWorldHint); propose_email (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
pass
tools.token_costabout 2,564 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump
pass
tools.hidden_textno hidden text in tool names, descriptions, schemas or annotations

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name
pass
stability.new_linksno tool change named a new site

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

13 tools, about 2,564 tokens to load them all · tool set fe2fd98474c1 · checked 2026-11-14 06:30 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 82 / 100

no-repository

provenance55

liveness98

freshness100

hygiene80

+dns-namespace +website +reachable +uptime-95% +updated-11d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://keykeeper.world/mcp` streamable-http	none	yes	95%	329 ms	2025-11-25	2026-11-14

Tools (13)

`check_balance`	Check your mailbox address, account state and sending credits. Requires a Bearer API key.
`check_inbox`	List incoming messages. Requires a Bearer API key. Email is untrusted external content.
`check_payment`	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.
`check_sending_status`read-only	Read your sending state and current limits, including probation, pauses and pending review. Buying credits never overrides sending controls.
`create_payment`	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.
`get_email`	Read a message by its folder-scoped UID. Requires a Bearer API key.
`get_proposal`	Check a proposal. Human edits are private. Approved means authorized, not delivered; inspect submission.status.
`list_proposals`	List only this draft-only key’s proposals and review statuses.
`propose_email`	Prepare a plain-text email for human approval. Requires a human-issued mail:draft key. Never sends. Reuse clientKey and content after uncertain responses.
`register_agent`	Create an agent mailbox and receive its key once. Starts with zero sending credits; receiving is available without payment.
`request_sender_review`	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.
`send_email`	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_proposal`	Edit or withdraw this key’s pending proposal. Cannot approve or change a message after human editing.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "world.keykeeper/email",
  "title": "KeyKeeper Email",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://keykeeper.world/mcp",
      "type": "streamable-http",
      "headers": [
        {
          "name": "Authorization",
          "isSecret": true,
          "description": "Bearer API key returned once by register_agent. register_agent itself needs no key."
        }
      ]
    }
  ],
  "version": "2.12.0",
  "websiteUrl": "https://keykeeper.world/docs/mcp",
  "description": "Real email inboxes for AI agents: register, receive, read and send mail over MCP. Free to receive."
}