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 agentmods add skills/sinch/sinch-plugins/voice-apinpx skills add sinch/sinch-plugins --skill voice-apigit clone --depth 1 https://github.com/sinch/sinch-pluginsWhat 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 | $0.00067 | $0.04382 |
| Opus 5 | $0.00034 | $0.02191 |
| Sonnet 5 | $0.00013 | $0.00876 |
| Haiku 4.5 | $0.00007 | $0.00438 |
Grade A, and why
sinch-voice-api scanned grade A with 1 finding 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 2d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
1. **Approach** — SDK or direct API calls (curl/fetch/requests)? This is a copy
100% identical to sinch-voice-api — 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 — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sinch Voice API
Overview
The Sinch Voice API lets you make, receive, and control voice calls programmatically via REST. It uses SVAML (Sinch Voice Application Markup Language) to define call flows through callback events.
Agent Instructions
Before generating code, gather from the user (skip any item already specified in the prompt or context):
- Approach — SDK or direct API calls (curl/fetch/requests)?
- Language — for SDK: Node.js, Python, Java, or .NET. For direct API: any language, or curl.
When the user chooses SDK, refer to the sinch-sdks skill for installation and client initialization, then to the bundled examples and SDK reference linked in Links.
When the user chooses direct API calls, refer to the Voice API Reference linked in Links for request/response schemas.
Security: See the Security section below for url fetching policy, handling inbound callback content, and credential handling.
Source of Truth — what to load, and what is authoritative
This skill has three kinds of content with UNEQUAL reliability. Follow this precedence:
- Canonical docs at
developers.sinch.com(AUTHORITATIVE). The.mddoc links in this skill are the single source of truth for exact request/response schemas, field names and nesting, enum values, signature/auth schemes, and limits. Before writing code that constructs a payload, verifies a signature, or parses a callback/response, fetch the specific linked doc and confirm the exact shape there. Fetching first-partydevelopers.sinch.comURLs is permitted by the Security/URL policy. Never invent, guess, or pattern-extrapolate a documentation URL — only fetch doc URLs written verbatim in this skill or reached by following a link on a page you already fetched; a trusted domain does not make a guessed path real. - Bundled
references/*.md(NAVIGATIONAL SUMMARIES — not authoritative). They orient you and point at the right canonical doc; they may lag, omit fields, or simplify nesting. Use them to decide what to build and which doc to open. Do NOT transcribe a field name, nesting, encoding, or enum from a reference or from the SKILL.md overview into shipped code without confirming it in the tier-1 doc. If a detail appears only in a summary, treat it as unverified and say so. - Bundled
scripts/**(EXECUTION TOOLS — not a schema reference). Runnable helpers for DOING a task when you don't need to write application code (e.g. create a webhook, send a test message, list resources). Run them to perform the action. Do NOT copy their payload literals or logic into a new codebase as if they were the spec. When authoring code, ignore the scripts and work from tier 1.
What ships with it
11 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.
- references/callbacks.md 10 KB
- references/examples/dotnet.md 5.7 KB
- references/examples/java.md 5.4 KB
- references/examples/nodejs.md 5.0 KB
- references/examples/python.md 4.1 KB
- references/svaml.md 14 KB
- scripts/common/voice_client.cjs 2.8 KB runs code
- scripts/get_call_info.cjs 1.9 KB runs code
- scripts/list_numbers.cjs 1.2 KB runs code
- scripts/make_conference_call.cjs 2.5 KB runs code
- scripts/make_tts_call.cjs 2.5 KB runs code
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.
- 2d ago First seen · 315 lines · 67 tokens per session scan A 7a74ef59913a
sinch-voice-api is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 20d ago), licensed Apache-2.0. It adds 67 tokens to every session and 4,382 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to sinch-voice-api, differing in 0 lines, and is treated as a copy.
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