calle-ai/awesome-phone-call-agents · skills/holdfast/SKILL.md

holdfast skillA

holdfast is agent-read markdown (skill) from calle-ai/awesome-phone-call-agents: Delegate real phone calls that must navigate IVR phone trees, wait on hold, and reach a human or automated service line. Turn a phone-work goal into a planned CALL-E call, navigate menus with DTMF, persist through hold, verify the outcome against transcript evidence, and contribute the discovered phone-tree path back to a shared IVR map library..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add calle-ai/awesome-phone-call-agents/holdfast@git:20260911.46be3d1
Exact content
mdr add calle-ai/awesome-phone-call-agents/holdfast@sha256:9e6e4c8a2b415aff

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_eeobo4tjj5ek5hl6.svg)](https://markdownregistry.com/a/art_eeobo4tjj5ek5hl6)

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Versions

versioncommittedcommitsizeaudit
git:20260911.46be3d1 latest2026-09-11 46be3d1 7,666 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, 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 (7666 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 · 88 stars · license MIT · pushed 2026-09-11 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_eeobo4tjj5ek5hl6
GET https://markdownregistry.com/api/v1/resolve?ref=calle-ai/awesome-phone-call-agents/holdfast
GET https://markdownregistry.com/api/v1/blob/9e6e4c8a2b415affd87d9ceb89b50c0baf8ed292d5d10073157f048d4533781b