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 XyrusCode/ai-sync --skill aws-blocksgit clone --depth 1 https://github.com/XyrusCode/ai-syncWrote 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/xyruscode/ai-sync/aws-blocks)<a href="https://agentmods.dev/skills/xyruscode/ai-sync/aws-blocks"><img src="https://agentmods.dev/badge/skills/xyruscode/ai-sync/aws-blocks/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/xyruscode/ai-sync/aws-blocks"><img src="https://agentmods.dev/badge/skills/xyruscode/ai-sync/aws-blocks.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 | $0.00105 | $0.01077 |
| Opus 5.5 | $0.00042 | $0.00431 |
| Sonnet 5.5 | $0.00021 | $0.00215 |
| Haiku 4.5 | $0.00011 | $0.00108 |
Grade A, and why
aws-blocks 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 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.
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.
This is a copy
98% identical to aws-blocks — 13 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 — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AWS Blocks Application Development
Package naming: All packages are published under the
@aws-blocksscope (e.g.,@aws-blocks/core,@aws-blocks/blocks,@aws-blocks/bb-kv-store).
Overview
AWS Blocks is an Infrastructure-from-Code framework where Building Blocks bundle CDK, SDK, and local mocks into a single API. It provides 18+ Building Blocks covering storage, authentication, real-time communication, background jobs, file management, AI/search, email, and observability — all working locally without AWS credentials.
Key characteristics:
- One
aws-blocks/directory defines the entire backend - Frontend imports are fully typed — no client generation needed
- All Building Blocks work locally without AWS (mocks persist to
.bb-data/) - Deploy ephemeral, individual testing environments with
npm run sandboxand long-lived environments withnpm run deployusing least-privilege credentials
Scaffolding a New Project
npx @aws-blocks/create-blocks-app my-app
cd my-app
To add AWS Blocks to an existing project:
npx @aws-blocks/create-blocks-app .
This detects the existing project and adds an aws-blocks/ workspace alongside your code.
To add AWS Blocks to an Amplify Gen 2 project:
npx @aws-blocks/create-blocks-app .
When the CLI detects amplify/backend.ts, it automatically integrates AWS Blocks with your Amplify backend.
With a specific template:
npx @aws-blocks/create-blocks-app my-app --template demo
cd my-app
Available Templates
| Template | Description |
|---|---|
default |
Vite + lit-html starter app with basic authentication, data persistence, and realtime to help demonstrate basic app architecture and patterns (used when --template is omitted) |
bare |
Vite + lit-html starter with a single "hello world" API method and a bare frontend |
react |
React + Vite starter with a single API endpoint and typed React frontend |
backend |
Backend-only — no frontend, just the AWS Blocks API with a single endpoint |
demo |
Todo app with AuthBasic, KVStore, DistributedTable, Zod schemas, indexes, and auth-protected CRUD |
auth-cognito |
Full AuthCognito passwordless email-OTP with roles, device management, and Authenticator UI |
nextjs |
Next.js + React starter with AWS Blocks backend integration (SSR + Server Components) |
What ships with it
1 file 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.
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 First seen · 94 lines · 105 tokens per session scan A e945a00c4601
aws-blocks is a skill published in the GitHub repository XyrusCode/ai-sync (2 stars, last pushed 18d ago), licensed MIT. It adds 105 tokens to every session and 1,077 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 98% identical to aws-blocks, differing in 13 lines, and is treated as a copy.
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