Premier Letters MCP server

• Registry namecom.premierletters/mcpverified in the MCP registry

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

• Stateanswerschecked 2026-10-25
• Tools12
• Server calls itselfpremier-letters
• Server version1.0.0
• Protocol version2025-06-18

On 2026-10-25 the server answered initialize and tools/list without a sign-in. First answer in 126 ms.

• Whether its tools do the product's job has not been judged yet.

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 score75 of 100answers 100 · definitions 81 · context 100 · connects 100 · lowered by the warning signs below
• Answered100% of days10 of 10 daily checks
• Median first answer242 ms
• Space in an agent's context≈ 2,626 tokensthe definitions of all its tools (12), which an agent carries on every turn
• Tool definitionsB · 81 of 100
• Typed results0 of 12 toolsdeclared outputSchema: results come typed, read once

• Parameters without a description: in 2 of 12
• Not saying whether it only reads or can destroy: 12 of 12

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 →

• 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…

• 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.

• 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…

• 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_templates

  List the authenticated user's saved letter templates.

• verify_address

  Verify and standardize a US mailing address via USPS. Use before create_order to catch typos and get the USPS-standardized form.

• 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.

• 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…

• get_order_status

  Get an order's status, delivery/tracking summary, and per-recipient mail status.

• list_orders

  List the authenticated user's recent orders.

• 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

  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…