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 sinch/sinch-plugins --skill functionsgit clone --depth 1 https://github.com/sinch/sinch-pluginsWrote 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/sinch/sinch-plugins/functions)<a href="https://agentmods.dev/skills/sinch/sinch-plugins/functions"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/functions/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/sinch/sinch-plugins/functions"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/functions.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 | $0.00089 | $0.05055 |
| Opus 5.5 | $0.00036 | $0.02022 |
| Sonnet 5.5 | $0.00018 | $0.01011 |
| Haiku 4.5 | $0.00009 | $0.00505 |
Grade A, and why
sinch-functions 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 10d 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.
This is a copy
86% identical to sinch-functions — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 334 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sinch Functions
Overview
Sinch Functions is in beta: free during the beta period, and the API may change before general availability. Sinch API usage (Voice, Conversation, Numbers) is billed as usual.
Sinch Functions is a serverless platform for voice, SMS, and conversation applications. You write a function, deploy it with the CLI, and Sinch routes callbacks and webhooks to it.
Functions are the compute layer between Sinch's telephony network and your business logic. A call comes in, Sinch invokes your function with an event, and your function returns call commands or a webhook response.
Voice API v2 is what a new function is written against. The unversioned name always means the current API: context.voice and Context.Voice are v2. The v2 sections below lead this skill because developers.sinch.com does not yet have a Functions-on-v2 page. Existing Voice v1 functions keep running unchanged; see Voice v1 callbacks.
Related skills for deeper guidance:
sinch-cli— CLI commands for the full Sinch platform (Functions, Voice, Numbers, Conversation, Fax, SIP)sinch-functions-node— Node.js/TypeScript runtime APIsinch-functions-dotnet— C#/.NET runtime API- Voice API v2 is covered by the
sinch-voice-api-v2skill; load it for the REST contract, SVAML v2 commands, and service configuration.
Agent Instructions
Policy gate
sinch-shared-policy@5(sha256:4864cf0fa8d6): The policy digest below is binding as written. Before implementation or live execution, read the full shared Sinch policy once per conversation — skip it if this exact ID/version/fingerprint is already loaded; read it if the version is newer or the fingerprint differs. This skill's canonical operation routes live in its Agent Instructions and Links sections.
Sinch policy digest (binding):
What ships with it
1 file 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.
- 10d ago First seen · 334 lines · 89 tokens per session scan A 9d081cafdba7
sinch-functions is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 11d ago), licensed Apache-2.0. It adds 89 tokens to every session and 5,055 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 86% identical to sinch-functions, differing in 0 lines, and is treated as a copy.
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