What is sinch-api-messages-send?

A command for sending text messages through Sinch Conversation API, a service for messaging customers. It supports SMS and RCS, a richer messaging format available on some phones.

Use it to send an SMS or RCS message to a phone number in international format. Provide the recipient, message, and optionally the channel.

It removes the need to manually construct the API request and handle message-channel settings. It checks the recipient, message, and required Sinch configuration before sending.

sinch-api-messages-send — Skill for Claude Code and Codex by sinch: A command for sending text messages through Sinch Conversation…

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-api-messages-send

Any agent

npx skills add sinch/sinch-plugins --skill sinch-api-messages-send

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-api-messages-send.svg)](https://agentmods.dev/skills/sinch/sinch-plugins/sinch-api-messages-send)

Your own site

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

Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,087 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 5.1	$0.00022	$0.01087
Opus 5	$0.00011	$0.00544
Sonnet 5	$0.00004	$0.00217
Haiku 4.5	$0.00002	$0.00109

Measured 5d ago against content hash 709d890a7573, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

sinch-api-messages-send 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-api-messages-send/SKILL.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Send Message

Send a text message to a recipient using the Sinch Conversation API. Currently supports SMS and RCS channels.

IMPORTANT: Execute this command directly. Do NOT generate script files. Do NOT create Python/JavaScript files. Perform the API call immediately using the instructions below.

Input

--to / -t: Recipient phone number (E.164 format, e.g., +14155551234) - required
--message / -m: Text content - required
--channel / -c: Channel (SMS or RCS) - optional, defaults to SMS

Arguments: $ARGUMENTS

Instructions

Execute these steps directly - do not write code or scripts:

Check if $ARGUMENTS is empty or only contains the command name:
- If empty or no meaningful arguments provided, enter interactive mode:
  - Ask: "📱 What is the recipient's phone number? (E.164 format, e.g., +14155551234)"
  - Ask: "💬 What message do you want to send?"
  - Ask: "📡 Which channel? (SMS or RCS, default: SMS)"
  - Use the provided answers as the arguments for the following steps
- If arguments are provided, proceed directly to step 1
Parse and validate arguments from $ARGUMENTS or interactive input:
- Validate that --to is provided and in E.164 format (e.g., +14155551234)
- Validate that --message is provided and non-empty
- If --channel is not provided, default to "SMS"
- Normalize channel to uppercase (sms → SMS, rcs → RCS)
- Validate that channel is either "SMS" or "RCS" (reject other channels)
Try to call mcp__sinch__send-text-message with the recipient, message, and channel.
If MCP tool is available:
- Report the result or handle any errors returned by the tool
- On success: Display message ID, recipient, channel, and status
- Skip to step 7
If MCP tool is NOT available, fallback to direct API implementation:
- Retrieve Sinch configuration from environment variables:
  - CONVERSATION_PROJECT_ID
  - CONVERSATION_REGION
  - CONVERSATION_APP_ID
  - CONVERSATION_KEY_ID
  - CONVERSATION_KEY_SECRET
- If any are missing, report: "Sinch API is not configured. Please set: CONVERSATION_PROJECT_ID, CONVERSATION_KEY_ID, CONVERSATION_KEY_SECRET, CONVERSATION_REGION, CONVERSATION_APP_ID"

Read the full file on GitHub · 114 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 · 114 lines · 22 tokens per session scan A 709d890a7573

Subscribe to this mod's changes

sinch-api-messages-send is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 23d ago), licensed Apache-2.0. It adds 22 tokens to every session and 1,087 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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