Ringback: Missed-Call Text-Back for Contractors

com.0xpi.ringback/missed-call-text-backringback.0xpi.comstreamable-httpv1.0.0Scanned 2 hours ago

Missed-call text-back for contractors: missed-call cost math, how it works, owners read their calls.

4 tools: 3 change things and 1 only read.

Reads private data · 0
Reads text others write · 1
Can send data out · 0
2 findings

Tools listed without sign-in. Remote posture

Anlyon alternative

3 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

4 tools

Changes things 3Creates or changes something that can be changed back.Claude Code: ask

estimate_missed_call_costArithmetic on your own numbers: calls per week x missed % x close rate x average job value, per week, month and year, with every step and assumption shown.1 finding
Why it is in this group
- The name "estimate_missed_call_cost" says "call": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "estimate_missed_call_cost" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "estimate_missed_call_cost" says "call": a word for a change.
  What this check looks for
Description, as the server wrote it
Arithmetic on your own numbers: calls per week x missed % x close rate x average job value, per week, month and year, with every step and assumption shown. It is an estimate of the value of jobs at stake from missed calls, not a prediction of what any tool will recover. Also shows how many saved jobs a month would cover Ringback's price.
Annotations the server declares
- title: Estimate missed-call cost
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
how_ringback_worksFacts about Ringback, missed-call text-back for contractors and home-service businesses: how the text is sent, phone requirements (Android, iPhone options), what the owner sees, pr…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
Facts about Ringback, missed-call text-back for contractors and home-service businesses: how the text is sent, phone requirements (Android, iPhone options), what the owner sees, price ($17/month or $170/year per business line), the 7-day free trial with no card, and what Ringback does not do.
Annotations the server declares
- title: How Ringback works
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
my_missed_callsList the missed calls in your own Ringback call log for a time range: when, the caller's number, whether a text-back went out (and its delivery status) or why not (e.g.1 finding
Why it is in this group
- The name "my_missed_calls" says "call": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "my_missed_calls" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "my_missed_calls" says "call": a word for a change.
  What this check looks for
Description, as the server wrote it
List the missed calls in your own Ringback call log for a time range: when, the caller's number, whether a text-back went out (and its delivery status) or why not (e.g. already texted recently, opted out, do-not-text), and the lead's status. Counts first, then up to 50 most recent calls. Needs a personal Ringback access token, created by the business owner in Ringback (Settings, AI assistants) and sent as "Authorization: Bearer <token>". Read-only; reads only that business's own call and text log.
Annotations the server declares
- title: My missed calls
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 1Looks things up and changes nothing.Show 1 read-only tool

my_texts_sentList the texts your Ringback line sent in a time range: missed-call text-backs, your replies from the dashboard and automatic replies, with delivery status as the phone reported it…Reads text others writeNo findings
Why it is in this group
- The description's first verb is "list": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "list" and "reply": it reads comments, which other people can write.
Description, as the server wrote it
List the texts your Ringback line sent in a time range: missed-call text-backs, your replies from the dashboard and automatic replies, with delivery status as the phone reported it, the median time from call to text-back, and up to 50 most recent texts with their wording. Needs a personal Ringback access token, created by the business owner in Ringback (Settings, AI assistants) and sent as "Authorization: Bearer <token>". Read-only; reads only that business's own call and text log.
Annotations the server declares
- title: My texts sent
- 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.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write1: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; my_texts_sent
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Nov 4, 2026, 02:18 UTC, unchanged since Nov 4, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 3
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 3 tools that change things (3 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://ringback.0xpi.com/mcp: tools/list returned 4 tools to an anonymous client, including estimate_missed_call_cost (write), how_ringback_works (write), my_missed_calls (write)
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

2 warn

Warnestimate_missed_call_cost
The server marks "estimate_missed_call_cost" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "estimate_missed_call_cost" says "call": a word for a change.
What this check looks for
Warnmy_missed_calls
The server marks "my_missed_calls" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "my_missed_calls" says "call": a word for a change.
What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

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

claude mcp add --transport http missed-call-text-back https://ringback.0xpi.com/mcp

claude mcp add --transport http missed-call-text-back https://ringback.0xpi.com/mcp

Run in a terminal.

Claude Code permissions

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

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__missed-call-text-back__my_texts_sent"
    ],
    "ask": [
      "mcp__missed-call-text-back__estimate_missed_call_cost",
      "mcp__missed-call-text-back__how_ringback_works",
      "mcp__missed-call-text-back__my_missed_calls"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as missed-call-text-back. Review it before you use it.

Capability tags behind 1 rule

mcp__missed-call-text-back__my_texts_sent untrusted-input

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/com.0xpi.ringback/missed-call-text-back/verify?hash=ec8a7ec0a663b7ff526ca58630071889155723fe3ced9bb91dca692a82da8962" | jq -e '.changed == false'

Pinned hash ec8a7ec0a663, from Nov 4, 2026, 02:17 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.0xpi.ringback/missed-call-text-back/changes.xml

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Badge

[![anlyon.dev](https://anlyon.dev/badge/com.0xpi.ringback/missed-call-text-back.svg)](https://anlyon.dev/servers/com.0xpi.ringback/missed-call-text-back)

Source: MCP Registry. Synced Nov 4, 2026, 02:17 UTC.