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 vobiz-ai/Agent-Skills --skill vobiz-voice-xmlgit clone --depth 1 https://github.com/vobiz-ai/Agent-SkillsWrote 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/vobiz-ai/agent-skills/vobiz-voice-xml)<a href="https://agentmods.dev/skills/vobiz-ai/agent-skills/vobiz-voice-xml"><img src="https://agentmods.dev/badge/skills/vobiz-ai/agent-skills/vobiz-voice-xml/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/vobiz-ai/agent-skills/vobiz-voice-xml"><img src="https://agentmods.dev/badge/skills/vobiz-ai/agent-skills/vobiz-voice-xml.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 | $0.00050 | $0.01613 |
| Opus 5 | $0.00025 | $0.00807 |
| Sonnet 5 | $0.00010 | $0.00323 |
| Haiku 4.5 | $0.00005 | $0.00161 |
Grade A, and why
vobiz-voice-xml 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 11d 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 — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vobiz Voice XML skill
Use this when the user wants to script a call flow declaratively - IVR menus, voicemail, queues, conferences, agent transfers. Anything beyond just "make a call and stream audio" usually involves VobizXML.
How Vobiz fetches XML
- Call is created via
POST /Call/withanswer_url. - When the callee answers, Vobiz POSTs to
answer_urlwith call context. - Your server returns
<Response>...verbs...</Response>asapplication/xml. - Verbs execute top-to-bottom.
Core verbs
| Verb | Purpose |
|---|---|
<Speak> |
TTS - speak text to the caller |
<Play> |
Play an audio file (HTTPS URL) |
<Gather> |
Collect DTMF or speech input |
<Dial> |
Bridge to another party (PSTN, SIP URI, app, conference) |
<Record> |
Record the call (optionally stream-while-recording) |
<Stream> |
Open a WebSocket for bidirectional audio (AI voice agents) |
<Conference> |
Add caller to a conference room |
<Redirect> |
Fetch new XML from a different URL |
<Wait> |
Pause for N seconds |
<Hangup> |
End the call |
<Preanswer> |
Run verbs before answering (no billsec) |
Request payload - what your answer_url receives
Standard application/x-www-form-urlencoded POST (GET sends them as query params). Common parameters: CallUUID, From, To, Direction, CallStatus, HangupCause, Duration, BillDuration, ForwardedFrom, plus ALegUUID/ALegRequestUUID for outbound calls and any custom X-VH- SIP headers. See xml/request for the full list.
Standard callback params by verb
Action/callback URLs receive the standard call params plus verb-specific ones:
<Gather action>:InputType(dtmf|speech),Digits,Speech,SpeechConfidenceScore,BilledAmount. EmptyDigits/Speechon timeout.<Dial action>:DialStatus(completed|busy|failed|cancel|timeout|no-answer),DialRingStatus,DialHangupCause,DialALegUUID,DialBLegUUID(empty if unanswered).<Dial callbackUrl>: liveDialAction(answer|connected|hangup|digits) events.<Record action>:RecordUrl,RecordingID,RecordingDuration(Ms),RecordingEndReason(RecordingTimeout|maxLength|FinishedOnKey|HungUp).<Conference callbackUrl>:ConferenceAction(enter|exit|start|end),ConferenceUUID,ConferenceName,ConferenceCurrentSize,RecordingUrl(on end).<Redirect>: standard params +Event=Redirect.
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.
- 11d ago First seen · 84 lines · 50 tokens per session scan A 7527fe529b67
vobiz-voice-xml is a skill published in the GitHub repository vobiz-ai/Agent-Skills (2 stars, last pushed 22d ago), licensed MIT. It adds 50 tokens to every session and 1,613 once invoked, about $0.0003 per session on Opus 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 2026-08-31.
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