# Premier Letters

> Send real pen-written letters, cards and postcards: quote, preview, order and track by mail.

- name: com.premierletters/mcp
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 73/100 (needs work)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.premierletters%2Fmcp
- tools: https://api.protogrid.dev/v1/servers/com.premierletters%2Fmcp/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "premierletters": {
      "type": "http",
      "url": "https://www.premierletters.com/api/mcp",
      "headers": {
        "Authorization": "Bearer ${PREMIERLETTERS_TOKEN}"
      }
    }
  }
}
```

Placeholders to fill: `${PREMIERLETTERS_TOKEN}`.

## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-29d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 73/100 (needs work)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: list_templates (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_balance (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); preview_letter (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 2,363 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 75 (weight 15)

- warn `stability.changes`: 8 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 12, about 2,363 tokens to load them all
- tool set hash: 8f0d2552b549a85ae40cce74fe6e18ca
- tools last changed: 2026-10-19T14:48:31.944Z
- badge: [![protogrid quality](https://protogrid.dev/badge/com.premierletters/mcp.svg)](https://protogrid.dev/servers/com.premierletters/mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-19 `create_topup_link` added
  - Create a Stripe Checkout link that adds prepaid credit (plus any bonus tier) to the authenticated account. Give checkout_url to the human to pay in a browser; the balance updates once they pay (check with get_balance). amount_cents must be a whole number between min_cents and max_cents from get_balance.
- 2026-10-19 `get_balance` added
  - Get the authenticated account's prepaid balance (balance_cents) and the top-up rules: minimum and maximum top-up, bonus tiers and suggested amounts. Orders paid with payment.method "balance" skip the small-order handling fee. Use create_topup_link to add funds.
- 2026-10-19 `create_order` changed (description, inputSchema)
  - before: Create and pay for a Premier Letters order — a real, handwritten letter mailed via USPS. Requires a Premier Letters API key. Use get_pricing or preview_letter first to confirm the price. For payment, "card_on_file" charges the caller's saved card immediately, "balance" pays from the prepaid account balance (no small-order handling fee; fails with insufficient_balance when short), or "checkout_session" returns a checkout_url for the human to complete payment in a browser.
  - after: Create and pay for a Premier Letters order — a real, handwritten letter mailed via USPS. Requires a Premier Letters API key. Use get_pricing or preview_letter first to confirm the price. For payment, "card_on_file" charges the caller's saved card immediately, "balance" pays from the prepaid account balance (no small-order handling fee; fails with insufficient_balance when short), or "checkout_session" returns a checkout_url for the human to complete payment in a browser. Envelope orders use return_address if given, otherwise the account's default return address; with neither, set no_return_address_ack: true to send without one.
- 2026-10-19 `get_pricing` changed (description, inputSchema)
  - before: Get a live price quote for a Premier Letters order. Pass char_count (or letter_count for a rough estimate) plus optional mailing_option and paper_type to get a per-piece and total price, in cents. No account needed. Orders under 5 pieces carry a $0.99 per-piece handling fee (included in total_cents), waived when paid from a prepaid balance.
  - after: Get a live price quote for a Premier Letters order. Pass char_count (or letter_count for a rough estimate) plus optional mailing_option and paper_type to get a per-piece and total price, in cents. No account needed. Orders under 5 pieces carry a $0.99 per-piece handling fee (included in total_cents), waived when paid from a prepaid balance. Pass output_mode (printed_bw / printed_color) to quote a printed letter body instead of a pen-written one, and envelope_output_mode to quote a printed envelope.
- 2026-10-19 `check_connection` added
  - Check whether the user approved a connect_account request. Returns status pending, denied, expired or claimed, or, exactly once, status approved with the api_key. Poll every 10-30 seconds.
- 2026-10-19 `connect_account` added
  - Get a Premier Letters API key without the user copying one by hand. Pass the user's email and your name; we email them a link to approve (they can sign up from it if they have no account). Then call check_connection with the returned request_id and poll_secret every 10-30 seconds until it returns the api_key (returned once). Show the returned user_code to the user so they can match it on the approval page. No account or key needed to call this.
- 2026-10-11 `create_order` changed (description, inputSchema)
  - before: Create and pay for a Premier Letters order — a real, handwritten letter mailed via USPS. Requires a Premier Letters API key. Use get_pricing or preview_letter first to confirm the price. For payment, either "card_on_file" charges the caller's saved card immediately, or "checkout_session" returns a checkout_url for the human to complete payment in a browser.
  - after: Create and pay for a Premier Letters order — a real, handwritten letter mailed via USPS. Requires a Premier Letters API key. Use get_pricing or preview_letter first to confirm the price. For payment, "card_on_file" charges the caller's saved card immediately, "balance" pays from the prepaid account balance (no small-order handling fee; fails with insufficient_balance when short), or "checkout_session" returns a checkout_url for the human to complete payment in a browser.
- 2026-10-11 `get_pricing` changed (description)
  - before: Get a live price quote for a Premier Letters order. Pass char_count (or letter_count for a rough estimate) plus optional mailing_option and paper_type to get a per-piece and total price, in cents. No account needed.
  - after: Get a live price quote for a Premier Letters order. Pass char_count (or letter_count for a rough estimate) plus optional mailing_option and paper_type to get a per-piece and total price, in cents. No account needed. Orders under 5 pieces carry a $0.99 per-piece handling fee (included in total_cents), waived when paid from a prepaid balance.

Full history: https://api.protogrid.dev/v1/servers/com.premierletters%2Fmcp/changes

## Remotes

- https://www.premierletters.com/api/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (12)

- `check_connection`: Check whether the user approved a connect_account request. Returns status pending, denied, expired or claimed, or, exactly once, status approved with the api_key. Poll every 10-30 seconds.
- `connect_account`: Get a Premier Letters API key without the user copying one by hand. Pass the user's email and your name; we email them a link to approve (they can sign up from it if they have no account). Then call check_connection with the returned request_id and poll_secret every 10-30 seconds until it returns the api_key (returned once). Show the returned user_code to the user so they can match it on the approval page. No account or key needed to call this.
- `create_order`: Create and pay for a Premier Letters order — a real, handwritten letter mailed via USPS. Requires a Premier Letters API key. Use get_pricing or preview_letter first to confirm the price. For payment, "card_on_file" charges the caller's saved card immediately, "balance" pays from the prepaid account balance (no small-order handling fee; fails with insufficient_balance when short), or "checkout_session" returns a checkout_url for the human to complete payment in a browser. Envelope orders use return_address if given, otherwise the account's default return address; with neither, set no_return_address_ack: true to send without one.
- `create_topup_link`: Create a Stripe Checkout link that adds prepaid credit (plus any bonus tier) to the authenticated account. Give checkout_url to the human to pay in a browser; the balance updates once they pay (check with get_balance). amount_cents must be a whole number between min_cents and max_cents from get_balance.
- `get_balance`: Get the authenticated account's prepaid balance (balance_cents) and the top-up rules: minimum and maximum top-up, bonus tiers and suggested amounts. Orders paid with payment.method "balance" skip the small-order handling fee. Use create_topup_link to add funds.
- `get_order_status`: Get an order's status, delivery/tracking summary, and per-recipient mail status.
- `get_pricing`: Get a live price quote for a Premier Letters order. Pass char_count (or letter_count for a rough estimate) plus optional mailing_option and paper_type to get a per-piece and total price, in cents. No account needed. Orders under 5 pieces carry a $0.99 per-piece handling fee (included in total_cents), waived when paid from a prepaid balance. Pass output_mode (printed_bw / printed_color) to quote a printed letter body instead of a pen-written one, and envelope_output_mode to quote a printed envelope.
- `list_handwriting_styles`: List available handwriting styles (fonts) for a letter order. Use the returned "id" as options.handwriting_style / handwriting_style when creating an order or previewing.
- `list_orders`: List the authenticated user's recent orders.
- `list_templates`: List the authenticated user's saved letter templates.
- `preview_letter`: Render a preview of a handwritten letter (as an SVG image) and get its price, before creating an order. Does not save anything.
- `verify_address`: Verify and standardize a US mailing address via USPS. Use before create_order to catch typos and get the USPS-standardized form.