Borrowing it
Nothing to install: this file belongs to sinch/skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/sinch/skills/main/AGENTS.mdgit clone --depth 1 https://github.com/sinch/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/instructions/sinch/skills/agents-md)<a href="https://agentmods.dev/instructions/sinch/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/sinch/skills/agents-md/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/instructions/sinch/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/sinch/skills/agents-md.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 | $0.01709 | $0.01709 |
| Opus 5.5 | $0.00684 | $0.00684 |
| Sonnet 5.5 | $0.00342 | $0.00342 |
| Haiku 4.5 | $0.00171 | $0.00171 |
Grade A, and why
skills AGENTS.md 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
5. **Key Concepts** and **Common Patterns** — domain model and worked examples in curl and the Node.js SDK (Mailgun skills use `mailgun.js`). How it starts
The opening of the file, as written. The whole thing — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Guidance for AI coding agents that use the Sinch skills in this repository to build against Sinch APIs. To create or edit skills, follow CONTRIBUTING.md.
What This Repository Provides
Official Sinch API skills for AI coding agents. Each skills/<product>/SKILL.md is a self-contained brief for one Sinch product: authentication, first API call, domain model, common patterns, gotchas, and links to the canonical documentation. Skills are listed on https://skills.sh/.
Installing
npx skills add sinch/skills
The skills are also available through the Sinch Plugins. Once installed, a skill activates when the user's request matches the description in its frontmatter.
Choosing the Right Skill
Load the smallest set of skills that owns the behavior. Start with the product skill; it tells you which supporting skills to load and when.
| Task | Start with |
|---|---|
| Credentials, OAuth2, Basic auth, application signing, API keys | sinch-authentication |
| Install or initialize an official Sinch SDK (Node.js, Python, Java, .NET) | sinch-sdks |
| Send or receive SMS | sinch-sms |
| Send MMS (US, CA, AU) | sinch-mms |
| Send RCS rich messages | sinch-rcs |
| Send WhatsApp messages or templates | sinch-whatsapp |
| Omnichannel apps, contacts, webhooks, templates, batch sending | sinch-conversation-api |
| Provision WhatsApp senders, RCS agents, KakaoTalk senders | sinch-provisioning-api |
| US 10DLC brand and campaign registration | sinch-10dlc |
| Voice calls, IVR, TTS, conferencing with the Voice API v1 | sinch-voice-api |
| Voice API v2 (public preview): calls, SVAML v2, webhooks, Voice Relay, audio streams | sinch-voice-api-v2 |
| In-app voice and video SDKs (Android, iOS, JavaScript) | sinch-in-app-calling |
| SIP trunks, endpoints, ACLs | sinch-elastic-sip-trunking |
| Phone number verification (SMS, flashcall, call, data, WhatsApp) | sinch-verification-api |
| Search, rent, release numbers | sinch-numbers-api |
| Buy numbers with KYC requirements | sinch-number-order-api |
| Port numbers into Sinch | sinch-porting-api |
| Import or host non-Sinch numbers for SMS | sinch-imported-numbers-hosting-orders |
| Carrier, line type, SIM swap lookups | sinch-number-lookup-api |
| Send and receive faxes | sinch-fax-api |
| Send, receive, track email with Mailgun | sinch-mailgun |
| Validate email addresses | sinch-mailgun-validate |
| Preview and quality-check email rendering | sinch-mailgun-inspect |
| Inbox placement and deliverability monitoring | sinch-mailgun-optimize |
| Sinch Functions serverless platform | sinch-functions, then sinch-functions-node or sinch-functions-dotnet |
The sinch CLI |
sinch-cli |
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 Changed · +1 tokens per session 54988af32a89
- 1mo ago Changed · +53 lines · +1,237 tokens per session a5d0a3d04dd9
- 2mo ago First seen · 41 lines · 471 tokens per session scan A 6cb43b266db9
skills AGENTS.md is an instructions file published in the GitHub repository sinch/skills (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 1,709 tokens to every session, about $0.0068 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
skills AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| skills AGENTS.mdsinch/skills | Instructions file | 11 | 1mo ago | Apache-2.0 | A | 1,709 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |