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 resonatehq/resonate-skills --skill resonate-external-system-of-record-pattern-javagit clone --depth 1 https://github.com/resonatehq/resonate-skillsWrote 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/resonatehq/resonate-skills/resonate-external-system-of-record-pattern-java)<a href="https://agentmods.dev/skills/resonatehq/resonate-skills/resonate-external-system-of-record-pattern-java"><img src="https://agentmods.dev/badge/skills/resonatehq/resonate-skills/resonate-external-system-of-record-pattern-java/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/resonatehq/resonate-skills/resonate-external-system-of-record-pattern-java"><img src="https://agentmods.dev/badge/skills/resonatehq/resonate-skills/resonate-external-system-of-record-pattern-java.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 | $0.00114 | $0.02818 |
| Opus 5 | $0.00057 | $0.01409 |
| Sonnet 5 | $0.00023 | $0.00564 |
| Haiku 4.5 | $0.00011 | $0.00282 |
Grade A, and why
resonate-external-system-of-record-pattern-java 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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Resonate External System of Record Pattern — Java
Prerelease note.
resonate-sdk-javais published on Maven Central — pinio.resonatehq:resonate-sdk-java:0.1.1. The API mirrors the Python SDK and may change before a stable1.0. Requires Java 21+ (virtual threads, a feature generally available in Java 21). There is no Java system-of-record example repo yet, so every code block here uses only documented SDK surface, compile-verified against0.1.1and cross-checked againstdevelop/java.mdx(docs PR #230) and the SDK source.
Overview
For the language-agnostic framing and the "Write Last, Read First" mental model, see resonate-external-system-of-record-pattern-typescript. This skill translates that model to idiomatic Java: ctx.run-based checkpointing, type-keyed dependency injection for the external client, and idempotency keys derived from the durable execution's stable ID.
The core contract is simple: one system owns the truth. Resonate coordinates the workflow and guarantees at-least-once execution; the external system enforces consistency through its own primitives — idempotency keys, upserts, conditional writes, ledger deduplication.
When to use
- A Resonate workflow must create, update, or read from a database, payment processor, ledger, or any external store that has its own durability.
- You need multi-step operations (reserve → charge → record) to be safe to retry without double-writes.
- You cannot use distributed transactions across Resonate's promise store and the external system.
Do not use this pattern when all writes live inside a single ACID transaction scope — use the transaction directly.
The replay principle — wrap every SoR call in ctx.run
Whenever a workflow suspends and resumes (after a ctx.sleep, a remote ctx.rpc, or a pending ctx.promise), the entire workflow body re-executes from the top. Durable child promises short-circuit steps that already settled — the external call is not re-fired, and the stored result is returned directly. But any external call NOT wrapped in a ctx.run will execute again on every replay, producing double-writes.
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 · 195 lines · 114 tokens per session scan A 3eb98156cf61
resonate-external-system-of-record-pattern-java is a skill published in the GitHub repository resonatehq/resonate-skills (6 stars, last pushed 19d ago), licensed Apache-2.0. It adds 114 tokens to every session and 2,818 once invoked, about $0.0006 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.
Other skills, from other repositories
springboot-patterns
Provides Spring Boot architecture patterns for REST APIs, layered services, JPA data access, caching, async processing, and logging. Use when working with Java Spring Boot files (.java, pom.xml) or when the user mentions Spring Boot, Spring Framework, or Java backend.
wxjava-api-contributor
A contributor guide for adding or maintaining official WeChat API support in WxJava, a Java software development kit. It covers services, request and response data objects, data conversion, HTTP handling, starter configuration, and regression tests.
azure-communication-callautomation-java
Build call automation workflows with Azure Communication Services Call Automation Java SDK. Use when implementing IVR systems, call routing, call recording, DTMF recognition, text-to-speech, or AI-powered call flows.
azure-communication-chat-java
Build real-time chat applications with Azure Communication Services Chat Java SDK. Use when implementing chat threads, messaging, participants, read receipts, typing notifications, or real-time chat features.
azure-communication-common-java
Azure Communication Services common utilities for Java. Use when working with CommunicationTokenCredential, user identifiers, token refresh, or shared authentication across ACS services.
azure-communication-sms-java
Send SMS messages with Azure Communication Services SMS Java SDK. Use when implementing SMS notifications, alerts, OTP delivery, bulk messaging, or delivery reports.