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 skills add sinch/sinch-plugins --skill sinch-rcsgit clone --depth 1 https://github.com/sinch/sinch-pluginsWrote 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/skills/sinch/sinch-plugins/sinch-rcs)<a href="https://agentmods.dev/skills/sinch/sinch-plugins/sinch-rcs"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/sinch-rcs/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/skills/sinch/sinch-plugins/sinch-rcs"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/sinch-rcs.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 | $0.00096 | $0.04775 |
| Opus 5.5 | $0.00038 | $0.01910 |
| Sonnet 5.5 | $0.00019 | $0.00955 |
| Haiku 4.5 | $0.00010 | $0.00477 |
Grade A, and why
sinch-rcs 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 11d 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 (curl, `fetch`, `requests`)? This is a copy
86% identical to sinch-rcs — 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 — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sinch RCS
Overview
RCS (Rich Communication Services) enables rich, branded messaging in the native device messaging app — including rich cards, carousels, suggested actions, media messages, location messages, read receipts, and typing indicators. When a device does not support RCS, configure automatic fallback to SMS.
Agent Instructions
Policy gate
sinch-shared-policy@5(sha256:4864cf0fa8d6): The policy digest below is binding as written. Before implementation or live execution, read the full shared Sinch policy once per conversation — skip it if this exact ID/version/fingerprint is already loaded; read it if the version is newer or the fingerprint differs. This skill's canonical operation routes live in its Agent Instructions and Links sections.
Sinch policy digest (binding):
- Load the shared policy once per conversation; skip duplicate copies bearing the same ID/version/fingerprint.
- Infer product, language, region, and environment from the request and workspace; ask one combined question only for true blockers. Prefer the official Sinch SDK unless the request or workspace decides otherwise or no official SDK covers the language or operation.
- Code-generation approval is not execution approval. Classify every operation (read-only / reversible / billable / destructive) and obtain explicit approval before billable or destructive calls.
- Tier B facts — endpoint paths, methods, field names, enums, limits, webhook payloads, signature algorithms, SDK signatures — require fetching the exact canonical document in the current session before use.
- Bundled scripts, references, and examples are Tier C: illustrations, never schema authority. Never promote example values to production defaults.
- If a route is unresolved or a canonical fetch fails, climb the resolution ladder in order — re-search already-fetched documents (raw, not summarized), consult https://developers.sinch.com/llms.txt, follow first-party links, retry once — before failing closed. Never pattern-guess a documentation URL; never substitute memory, search snippets, or bundled files.
- Keep an evidence ledger mapping each fetched source to the fields and claims it authorized.
- Bound all polling and retries (backoff, jitter, hard cap); check state before retrying billable or destructive operations; report a timeout as unknown, not failed.
- Report verification levels separately (lint → unit → mock contract → sandbox → live → end-to-end); an HTTP 2xx does not prove delivery. State the levels not performed.
- Load only the smallest skill set that owns the behavior; if a required skill is unavailable, name it and stop rather than improvising its instructions.
What ships with it
10 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/shared-policy.md 14 KB
- scripts/common/sinch_client.cjs 2.0 KB runs code
- scripts/send_calendar.cjs 6.1 KB runs code
- scripts/send_card.cjs 5.8 KB runs code
- scripts/send_carousel.cjs 5.1 KB runs code
- scripts/send_choice.cjs 5.0 KB runs code
- scripts/send_location.cjs 5.2 KB runs code
- scripts/send_media.cjs 3.9 KB runs code
- scripts/send_template.cjs 5.8 KB runs code
- scripts/send_text.cjs 3.6 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.
- 11d ago First seen · 241 lines · 96 tokens per session scan A 0ef53bf8d0a2
sinch-rcs is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 11d ago), licensed Apache-2.0. It adds 96 tokens to every session and 4,775 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 86% identical to sinch-rcs, differing in 0 lines, and is treated as a copy.
Other skills, from other repositories
wraps-workflows
Build email and SMS automation workflows using the @wraps.dev/client TypeScript DSL. Covers triggers, steps, branching, cascades, and the full defineWorkflow API.
code_explorer
Explores the repository to locate primary source files, coupled UI components, and test files for bug reports or feature requests.
quality
Evaluates whether a GitHub issue is spam, empty, needs more information, or is OK to proceed.
wikipedia
Search and read Wikipedia via x wkp — MediaWiki API, no API key, zero install; query, extract, suggest, and DDG route in one module. Load for wiki, wikipedia, encyclopedia lookup, article summary.
scaffold-project
Scaffold a new app, API, backend, fullstack project, mobile app, polyglot service, monorepo, or starter with Better Fullstack. Use when the user wants to create, start, bootstrap, initialize, or generate a project from a stack description. Prefer the bundled Better Fullstack MCP server: guidance, schema…
migrate-oracle-forms
Assess and migrate Oracle Forms applications to Mendix — .fmb forms to pages, PL/SQL to microflows, and a staged migration strategy. Use when analysing or converting an Oracle Forms system.