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Book a Sponsor

by bookasponsor.com · remote · no sign-in to list tools · v1.0.0 · published by com.bookasponsor

Find brands that already sponsor newsletters like yours, with sponsorship rates.

Changes · 1
CompareRegistry entry

4 tools: 1 change things and 3 only read.

Scanned Oct 21, 2026

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http book-a-sponsor https://bookasponsor.com/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnfind_newsletter_sponsors

    The server marks "find_newsletter_sponsors" as not read-only (readOnlyHint: false), and its words say it reads.

    Matched text

    annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "find_newsletter_sponsors" says "find": a word for reading.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Changes things 1Claude Code: ask
  • find_newsletter_sponsorsUse this when someone who runs a newsletter asks which brands might sponsor it or how to find sponsors for it.1 finding

    Why it is in this group

    • The name "find_newsletter_sponsors" says "find": a word for reading.
    • The server marks it as not read-only (readOnlyHint: false).

    Findings

    • Warn

      The server marks "find_newsletter_sponsors" as not read-only (readOnlyHint: false), and its words say it reads.

      Matched text

      annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "find_newsletter_sponsors" says "find": a word for reading.

      What this check looks for
    Description, as the server wrote it
    Use this when someone who runs a newsletter asks which brands might sponsor it or how to find sponsors for it. Takes the newsletter's web address, finds similar newsletters, and returns the brands that sponsored them, with the newsletters and dates where each ad ran. Starts a scan of the public newsletter pages if none exists; a new scan takes about 15 to 60 seconds.

    Annotations the server declares

    • title: Find sponsors for a newsletter
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
Only reads 3Claude Code: allow
  • get_newsletter_sponsorship_ratesUse this when someone asks how much to charge for a newsletter sponsorship or what newsletters charge for an ad.No findings

    Why it is in this group

    • The name "get_newsletter_sponsorship_rates" says "get": a word for reading.
    Description, as the server wrote it
    Use this when someone asks how much to charge for a newsletter sponsorship or what newsletters charge for an ad. Returns the median price newsletters list for the main sponsor slot of one issue, by list size, read from their own advertise pages.

    Annotations the server declares

    • title: Get newsletter sponsorship rates
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_sponsor_scanUse this to read the result of a sponsor scan that find_newsletter_sponsors started, for example when it reported that the scan was still running.No findings

    Why it is in this group

    • The name "get_sponsor_scan" says "get": a word for reading.
    Description, as the server wrote it
    Use this to read the result of a sponsor scan that find_newsletter_sponsors started, for example when it reported that the scan was still running. Takes the same newsletter web address.

    Annotations the server declares

    • title: Get a newsletter sponsor scan
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_brands_sponsoring_newslettersUse this when someone asks which companies or brands sponsor newsletters, overall or in a topic such as AI, finance or marketing.No findings

    Why it is in this group

    • The name "list_brands_sponsoring_newsletters" says "list": a word for reading.
    Description, as the server wrote it
    Use this when someone asks which companies or brands sponsor newsletters, overall or in a topic such as AI, finance or marketing. Returns the brands seen in the most newsletters in the last 12 months, mostly read from published issues.

    Annotations the server declares

    • title: List brands sponsoring newsletters
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

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.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http book-a-sponsor https://bookasponsor.com/mcp

Run in a terminal.

Claude Code permissions

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

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__book-a-sponsor__get_sponsor_scan",
      "mcp__book-a-sponsor__list_brands_sponsoring_newsletters",
      "mcp__book-a-sponsor__get_newsletter_sponsorship_rates"
    ],
    "ask": [
      "mcp__book-a-sponsor__find_newsletter_sponsors"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as book-a-sponsor. Review it before you use it.