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call-attest-challenge-auth SKILL.md skillA

call-attest-challenge-auth from calle-ai/awesome-phone-call-agents is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add calle-ai/awesome-phone-call-agents/call-attest-challenge-auth@git:20260920.7071223

Pins git:20260920.7071223 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: calle-ai/awesome-phone-call-agents
Path: skills/call-attest-challenge-auth/SKILL.md
Versions recorded: 1
Latest version: git:20260920.7071223, committed Sep 20, 2026
Size: 4,556 bytes
Repository stars: 112
License: MIT

Offline experimental spoken-code coordination illustration for CALL-E workflows. Generates a nonce and HMAC-derived short code from an environment-variable secret, then fuzzy-matches a supplied transcript against the supplied expected code. An optional local JSONL ledger flags recorded nonce reuse. This is not identity authentication, a secure replay guarantee or permission to disclose sensitive information.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# call-attest-challenge-auth

> **An offline spoken-code coordination experiment.**

This companion to `dialtone-handshake` generates an illustrative short code
derived from a pre-shared secret and checks a supplied transcript for a
fuzzy match. A matching code is only a text-level coordination signal;
recorded nonce reuse may indicate replay or an operator error. Neither
result authenticates a counterparty or authorizes sensitive disclosure.

## When To Use

- to rehearse a coordination exchange between consenting test participants
- to flag a challenge recorded in the optional local nonce ledger
- to generate the challenge goal for `plan_call` and the expected code to
  verify against

## When Not To Use

- to recognize whether the other end is AI at all; use
  `dialtone-handshake`
- to authenticate humans; spoken codes leak through the audio channel to
  anyone listening
- against a determined man-in-the-middle who can hear and relay the code;
  this protocol does not defend against that (see safety.md)
- to authorize sensitive disclosure or any financial, medical, employment,
  safety or other consequential operation, even when the label is VERIFIED

## Workflow
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add calle-ai/awesome-phone-call-agents/call-attest-challenge-auth@sha256:374b1cd2a7a309f5

The line at the top of this page pins the label git:20260920.7071223, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_gwxsrelp2lzb3md7.svg)](https://markdownregistry.com/a/art_gwxsrelp2lzb3md7)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Sep 20, 2026.

version	committed	commit	size	audit
git:20260920.7071223 latest	2026-09-20	7071223	4,556 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4556 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

calle-ai/awesome-phone-call-agents · 112 stars · license MIT · pushed 2026-11-05 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_gwxsrelp2lzb3md7
GET https://markdownregistry.com/api/v1/resolve?ref=calle-ai/awesome-phone-call-agents/call-attest-challenge-auth
GET https://markdownregistry.com/api/v1/blob/374b1cd2a7a309f5c0e4b6467e1d0d780181ef605cced355e3e3efe469ecad71

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.