What is sinch-api-numbers-lookup?

A command for looking up phone-number details through the Sinch Number Lookup API, including carrier, line type, porting status, and VoIP probability. It accepts one or more phone numbers in international E.164 format.

Use it to check phone-number metadata and display the results as a table or JSON, provided the Sinch API credentials are configured.

It saves you from building the authentication, request, validation, and response-formatting steps for these lookups yourself.

sinch-api-numbers-lookup — Skill for Claude Code by sinch

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.

Any agent

npx skills add sinch/sinch-plugins --skill sinch-api-numbers-lookup

Clone the repo

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

Made for: Claude Code.

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-numbers-lookup.svg)](https://agentmods.dev/skills/sinch/sinch-plugins/sinch-api-numbers-lookup)

Your own site

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

Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 426 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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	$0.00027	$0.00426
Opus 5	$0.00014	$0.00213
Sonnet 5	$0.00005	$0.00085
Haiku 4.5	$0.00003	$0.00043

Measured 8d ago against content hash 3809300e0a57, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

sinch-api-numbers-lookup 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 8d 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-numbers-lookup/SKILL.md · 45 lines

What it actually says

Number Lookup

Retrieve details about one or more phone numbers using the Sinch Number Lookup API: carrier, line type, porting status, VoIP probability, etc. Uses OAuth2.

IMPORTANT: Execute this command directly. Do NOT generate script files. Perform the API call immediately.

Input

--numbers / -n: Comma-separated E.164 numbers to look up - required
--format / -f: Output format (table or json) - optional, default table

Arguments: $ARGUMENTS

Instructions

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

If $ARGUMENTS empty: ask for phone number(s) to look up. Otherwise parse.
Validate: --numbers (at least one E.164). Get CONVERSATION_PROJECT_ID, CONVERSATION_KEY_ID, CONVERSATION_KEY_SECRET. Lookup API: https://lookup.api.sinch.com/v2. If missing, report "Sinch API is not configured."
Request body: numbers (array of E.164 strings). POST https://lookup.api.sinch.com/v2/projects/{projectId}/lookups with OAuth2 Bearer token.
Format response: table (number, carrier, line type, etc.) or JSON. Display "✅ Lookup complete". Handle 400, 401 with clear messages.
Handle all errors gracefully.

Examples

/sinch-api-numbers-lookup --numbers=+14155551234
/sinch-api-numbers-lookup -n +14155551234,+14159876543 --format=json

API Reference

Base URL: https://lookup.api.sinch.com/v2
Endpoint: POST /projects/{projectId}/lookups
Documentation: https://developers.sinch.com/docs/number-lookup/

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.

8d ago First seen · 45 lines · 27 tokens per session scan A 3809300e0a57

Subscribe to this mod's changes

sinch-api-numbers-lookup is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 26d ago), licensed Apache-2.0. It adds 27 tokens to every session and 426 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.

Claude Code ai cli gemini gemini-extension sms

sinch-api-numbers-lookup

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

Number Lookup

Input

Instructions

Examples

API Reference

What this file has done since we first saw it

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