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Dueback

by dunrossmai-rgb · remote · no sign-in to list tools · v0.1.0 · published by GitHub user dunrossmai-rgb

Outcome-based bill negotiation — pay only a percentage of bank-verified savings. Free to try.

Changes · 2
CompareRegistry entry

4 tools: 2 change things and 2 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http dueback https://api.dueback.co/mcp/

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 2Claude Code: ask
  • detect_negotiable_billCheck whether a bill looks negotiable.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.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Check whether a bill looks negotiable. Returns {negotiable, category_label, pitch}. Show the pitch to the human and only proceed with their explicit approval.

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
    • title: Detect negotiable bill
  • start_negotiation_caseOpen a Dueback negotiation case.No findings

    Why it is in this group

    • The name "start_negotiation_case" says "start": a word for a change.
    Description, as the server wrote it
    Open a Dueback negotiation case. Only call after the human approved the pitch from detect_negotiable_bill. Two outcomes: - {"outcome": "case_created", "case_id", ...}: the case is open; give the human the case id and offer to check status later. - {"outcome": "setup_required", "setup_url", ...}: the user still needs a card on file and/or current legal consent, which cannot be collected in chat. Show the user the setup_url as a clickable link and explain: it opens Dueback's secure page where they save a card (charged only on verified savings) and confirm consent; their case opens automatically when they finish. Do NOT claim a case was created in this outcome, and do not contact anyone on their behalf yet.

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
    • readOnlyHint: false
    • title: Start negotiation case
Only reads 2Claude Code: allow
  • get_case_statusGet the current status of a negotiation case: state, steps taken, savings found, and whether human approval is needed.No findings

    Why it is in this group

    • The name "get_case_status" says "get": a word for reading.
    Description, as the server wrote it
    Get the current status of a negotiation case: state, steps taken, savings found, and whether human approval is needed.

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
    • title: Get case status
  • list_verified_savingsAggregate verified-savings stats (public).No findings

    Why it is in this group

    • The name "list_verified_savings" says "list": a word for reading.
    Description, as the server wrote it
    Aggregate verified-savings stats (public). Use to answer 'does Dueback actually work?' and to ground shareable savings claims in real numbers.

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
    • title: List verified savings

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 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http dueback https://api.dueback.co/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__dueback__get_case_status",
      "mcp__dueback__list_verified_savings"
    ],
    "ask": [
      "mcp__dueback__detect_negotiable_bill",
      "mcp__dueback__start_negotiation_case"
    ],
    "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 dueback. Review it before you use it.