What is sinch-config-auth?

An authentication setup guide for Sinch, a communications platform whose APIs handle messaging, voice, phone numbers, email, and verification.

Use it when connecting an application to Sinch APIs or setting the required environment variables for OAuth2, voice, verification, Mailgun, or Mailjet.

It explains which credentials each Sinch product needs and where to find them, so you can configure access without guessing.

sinch-config-auth — Skill for Claude Code and Codex by sinch: An authentication setup guide for Sinch, a communications platform…

Install

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.

agentmods

npx agentmods add skills/sinch/sinch-plugins/sinch-config-auth

Any agent

npx skills add sinch/sinch-plugins --skill sinch-config-auth

Clone the repo

git clone --depth 1 https://github.com/sinch/sinch-plugins

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sinch/sinch-plugins/sinch-config-auth.svg)](https://agentmods.dev/skills/sinch/sinch-plugins/sinch-config-auth)

Your own site

<a href="https://agentmods.dev/skills/sinch/sinch-plugins/sinch-config-auth"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/sinch-config-auth.svg" alt="Measured on agentmods" height="20"></a>

Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 588 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00015	$0.00588
Opus 5	$0.00008	$0.00294
Sonnet 5	$0.00003	$0.00118
Haiku 4.5	$0.00002	$0.00059

Measured 5d ago against content hash 9ab9f0e1e82d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sinch-config-auth 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 5d 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.

plugins/sinch-antigravity-plugin/skills/sinch-config-auth/SKILL.md · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sinch Authentication Setup

Display a concise authentication guide for Sinch APIs used by this plugin. Do NOT generate script files. Output the guide directly.

Instructions

Display the following information directly - do not write code or scripts:

Sinch Dashboard
- Go to https://dashboard.sinch.com
- Settings > Access Keys: note Project ID, create Access Key (Key ID + Key Secret). Store Key Secret securely — shown only once.
Credential types by product
- OAuth2 (Project ID + Key ID + Key Secret): Conversation API, Numbers, Fax, Batch, Templates, Number Lookup, 10DLC, Elastic SIP Trunking, Provisioning. Set: CONVERSATION_PROJECT_ID, CONVERSATION_KEY_ID, CONVERSATION_KEY_SECRET, CONVERSATION_REGION, CONVERSATION_APP_ID (for messaging).
- Application Key + Secret: Voice API, Verification API. Set: VOICE_APPLICATION_KEY, VOICE_APPLICATION_SECRET; or verification app credentials.
- Mailgun: MAILGUN_API_KEY, MAILGUN_DOMAIN, MAILGUN_REGION (us or eu).
- Mailjet: MJ_APIKEY_PUBLIC, MJ_APIKEY_PRIVATE.
Getting an OAuth2 token (for REST)
- POST https://auth.sinch.com/oauth2/token with grant_type=client_credentials, Basic Auth KEY_ID:KEY_SECRET. Use returned access_token as Bearer (valid ~1 hour).
Plugin credentials (Antigravity)
- Antigravity plugins do not prompt for credentials at install time. Export environment variables in your shell before starting agy:
```
export CONVERSATION_PROJECT_ID="your-project-id"
export CONVERSATION_KEY_ID="your-key-id"
export CONVERSATION_KEY_SECRET="your-key-secret"
export CONVERSATION_REGION="us"   # us | eu | br
export CONVERSATION_APP_ID="your-app-id"
```
- Optional product credentials: VOICE_APPLICATION_KEY, VOICE_APPLICATION_SECRET; VERIFICATION_APPLICATION_KEY, VERIFICATION_APPLICATION_SECRET; MAILGUN_API_KEY, MAILGUN_DOMAIN, MAILGUN_REGION; MJ_APIKEY_PUBLIC, MJ_APIKEY_PRIVATE.
- The bundled mcp_config.json passes ${CONVERSATION_*} through to the Build MCP. Restart agy after changing env vars.

Read the full file on GitHub · 45 lines

Changes

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.

5d ago First seen · 45 lines · 15 tokens per session scan A 9ab9f0e1e82d

Subscribe to this mod's changes

sinch-config-auth is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 23d ago), licensed Apache-2.0. It adds 15 tokens to every session and 588 once invoked, about $0.0001 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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