Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add CALLE-AI/awesome-phone-call-agents --skill volunteer-voice-bookinggit clone --depth 1 https://github.com/CALLE-AI/awesome-phone-call-agentsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/calle-ai/awesome-phone-call-agents/volunteer-voice-booking)<a href="https://agentmods.dev/skills/calle-ai/awesome-phone-call-agents/volunteer-voice-booking"><img src="https://agentmods.dev/badge/skills/calle-ai/awesome-phone-call-agents/volunteer-voice-booking/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/calle-ai/awesome-phone-call-agents/volunteer-voice-booking"><img src="https://agentmods.dev/badge/skills/calle-ai/awesome-phone-call-agents/volunteer-voice-booking.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00055 | $0.01498 |
| Opus 5.5 | $0.00022 | $0.00599 |
| Sonnet 5.5 | $0.00011 | $0.00300 |
| Haiku 4.5 | $0.00006 | $0.00150 |
Grade A, and why
volunteer-voice-booking scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Volunteer Voice Booking
Use this skill when a nonprofit, community host, or volunteer coordinator wants to turn a callback request into one scheduled appointment, reached over the phone rather than through a web form.
volunteer-voice-booking turns one callback request into at most one call, one structured
result, and at most one calendar booking. It is outbound-first: the volunteer leaves a number
on a "Book a call" form, and the agent calls back to run the interview and book the slot. It does not
answer an inbound hotline, run a call campaign, or manage recurring schedules. Recurrence belongs to
the host scheduler.
The workflow is deliberately narrow: confirm the volunteer, ask the qualification questions, offer only pre-computed free slots, capture consent, and hand the booking to a human approval gate.
When To Use
Use this skill for:
- calling back a volunteer who submitted a "Book a call" or callback request
- running a short qualification interview over the phone
- confirming a preferred 30-minute slot from a set of real, pre-computed free slots
- writing the result to a calendar as a real event with a meeting link and confirmation email
- keeping every booking behind a human "Approve & call" gate
When Not To Use
Do not use this skill to:
- call people who did not request a callback or otherwise ask to be contacted
- answer an inbound hotline (that requires a dispatcher and result webhook, not a callback)
- collect payment, donations, or billing details
- deliver medical, legal, financial, or emergency instructions
- invent availability that the scheduler did not provide
- book a slot without a human sign-off, or re-call someone who declined
Required Inputs
request_id: stable local request identifiervolunteer_name: name as provided on the formto_phone_e164: volunteer phone number in E.164 formatorganization_name: organization to disclose on the callbooking_purpose: the calendar bucket, such asonsite,online, orpartnershipslot_duration_minutes: expected appointment duration (for example, 30)free_slots: list of pre-computed bookable windows, already checked against existing bookingsqualification_questions: the short screening questions to asktimezone: IANA timezone used to present the slots
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 158 lines · 55 tokens per session scan A 785e6bcc1156
volunteer-voice-booking is a skill published in the GitHub repository CALLE-AI/awesome-phone-call-agents (109 stars, last pushed yesterday), licensed MIT. It adds 55 tokens to every session and 1,498 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-15.
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