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holdline SKILL.md skillA

holdline 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/holdline@git:20260911.f7a3e12

Pins git:20260911.f7a3e12 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/holdline/SKILL.md
Versions recorded: 1
Latest version: git:20260911.f7a3e12, committed Sep 11, 2026
Size: 6,347 bytes
Repository stars: 112
License: MIT

Ask one question of many places by phone and get back only the answers the call actually established. Use for batch phone enquiries where a wrong answer is worse than no answer — supplier stock checks, capacity and availability enquiries, claim and case status, directory verification. Includes evidence checking that catches values a call returns for questions it never asked.

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

# holdline

Place a batch of phone enquiries through CALL-E, then check every returned
field against the transcript turns the agent actually spoke. A field whose
question was never asked does not come back, whatever the model reported.

## When to use this

Use it when the same question goes to several places and a confidently wrong
answer causes real damage: sourcing a part across suppliers, checking which
clinics have capacity, chasing case status across agencies, verifying that a
directory listing is still true.

Do not use it for a conversation, for anything requiring negotiation or
judgement on the call, or where a person must decide something in the moment.
This asks a fixed question and records the answer.

## Safety

- **Real calls reach real people.** `run_hold` requires `confirm: true` in the
  same request. There is no setting that removes the confirmation.
- **Plan first.** `plan_hold` shows the compiled task, every number it would
  dial, and what the ledger already knows. It never dials.
- Do not guess phone numbers, country codes, or subject ids. Ask the user.
- Emergency and crisis-line prefixes are refused unconditionally and cannot be
  enabled by configuration.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add calle-ai/awesome-phone-call-agents/holdline@sha256:6c70d76fb951d189

The line at the top of this page pins the label git:20260911.f7a3e12, 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_btg73z6z3n47wc6z.svg)](https://markdownregistry.com/a/art_btg73z6z3n47wc6z)

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

Versions

The registry has recorded 1 version of this file, committed on Sep 11, 2026.

version	committed	commit	size	audit
git:20260911.f7a3e12 latest	2026-09-11	f7a3e12	6,347 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 (6347 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_btg73z6z3n47wc6z
GET https://markdownregistry.com/api/v1/resolve?ref=calle-ai/awesome-phone-call-agents/holdline
GET https://markdownregistry.com/api/v1/blob/6c70d76fb951d18969a2544478c9cb276ec2323476ce9d66449a3dff84d95e59

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.